GS50 Gradient Pump Operator`s Manual

GS50 Gradient Pump Operator`s Manual
GS50 GRADIENT PUMP
OPERATOR'S MANUAL
© 2003 Dionex Corporation
Document No. 031612
Revision 03
October 2003
© 2003 by Dionex Corporation
All rights reserved worldwide.
Printed in the United States of America.
This publication is protected by federal copyright law. No part of this publication
may be copied or distributed, transmitted, transcribed, stored in a retrieval system, or
transmitted into any human or computer language, in any form or by any means,
electronic, mechanical, magnetic, manual, or otherwise, or disclosed to third parties
without the express written permission of Dionex Corporation, 1228 Titan Way,
Sunnyvale, California 94088-3603 U.S.A.
DISCLAIMER OF WARRANTY AND LIMITED WARRANTY
THIS PUBLICATION IS PROVIDED “AS IS” WITHOUT WARRANTY OF
ANY KIND. DIONEX CORPORATION DOES NOT WARRANT,
GUARANTEE, OR MAKE ANY EXPRESS OR IMPLIED
REPRESENTATIONS REGARDING THE USE, OR THE RESULTS OF THE
USE, OF THIS PUBLICATION IN TERMS OF CORRECTNESS, ACCURACY,
RELIABILITY, CURRENTNESS, OR OTHERWISE. FURTHER, DIONEX
CORPORATION RESERVES THE RIGHT TO REVISE THIS PUBLICATION
AND TO MAKE CHANGES FROM TIME TO TIME IN THE CONTENT
HEREINOF WITHOUT OBLIGATION OF DIONEX CORPORATION TO
NOTIFY ANY PERSON OR ORGANIZATION OF SUCH REVISION OR
CHANGES.
TRADEMARKS
Chromeleon, DX-LAN, PeakNet, Self-Regenerating Suppressor, and SRS are
trademarks or registered trademarks of Dionex Corporation.
Tefzel is a registered trademark of E.I. duPont de Nemours & Company.
PRINTING HISTORY
Revision 01, April 2000
Revision 02, September 2001
Revision 03, October 2003
Contents
1 • Introduction
1.1
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-1
1.2
About This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-3
1.3
1.2.1
Typefaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-4
1.2.2
Safety Messages and Notes . . . . . . . . . . . . . . . . . . . . . . . . . . .1-4
Safety Labels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-6
2 • Description
2.1
Front Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1
2.1.1
Control Panel Keypad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-2
2.1.2
Display Screens . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-7
2.2
Electronics Chassis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-9
2.3
Mechanical Chassis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-11
2.4
Interior Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-12
2.4.1
Pump Heads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-12
2.4.2
Pressure Transducer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-14
2.4.3
Gradient Mixer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-14
2.4.4
Flow Path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-15
2.5
Vacuum Degas Assembly (Optional) . . . . . . . . . . . . . . . . . . . . . . . . .2-16
2.6
Eluent Reservoirs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-17
2.7
Rear Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-18
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GS50 Gradient Pump
2.8
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19
2.8.1
Operating Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-21
2.8.2
Method (Front Panel) Control . . . . . . . . . . . . . . . . . . . . . . . . 2-21
2.8.3
Eluent Delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-23
3 • Operation and Maintenance
3.1
3.2
3.3
ii
Getting Ready to Run . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
3.1.1
Degas Eluents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
3.1.2
Filter Eluents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
3.1.3
Pressurize Eluent Reservoirs . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
3.1.4
Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
3.1.5
Selecting the Pressure Limits . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
3.1.6
Calibrating the Pressure Ripple . . . . . . . . . . . . . . . . . . . . . . . . 3-5
Running Under Direct Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
3.2.1
Locked Remote Direct Control . . . . . . . . . . . . . . . . . . . . . . . . 3-7
3.2.2
Local Direct Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
Running Under Method (Front Panel) Control . . . . . . . . . . . . . . . . . . . 3-9
3.3.1
Creating a New Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
3.3.2
Running a Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12
3.3.3
Editing a Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13
3.3.4
Deleting a Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14
3.3.5
Changing the Running Method . . . . . . . . . . . . . . . . . . . . . . . 3-14
3.3.6
Controlling the Method Clock . . . . . . . . . . . . . . . . . . . . . . . . 3-14
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Contents
3.4
Example Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-15
3.4.1
Isocratic Method Example . . . . . . . . . . . . . . . . . . . . . . . . . . .3-15
3.4.2
Linear Gradient Method Example . . . . . . . . . . . . . . . . . . . . .3-16
3.4.3
Curved Gradient Method Example . . . . . . . . . . . . . . . . . . . . .3-19
3.4.4
Editing a Running Method Example . . . . . . . . . . . . . . . . . . .3-21
3.5
Routine Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-23
3.6
Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-25
4 • Troubleshooting
4.1
Pressure Fluctuations Between Pump Heads . . . . . . . . . . . . . . . . . . . .4-1
4.2
Pump Does Not Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-3
4.3
Pump Stops . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-4
4.4
Liquid Leaks/Leak Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-8
4.5
Noisy Pump Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-9
4.6
Vacuum Degas Assembly Does Not Run . . . . . . . . . . . . . . . . . . . . . . .4-9
4.7
Vacuum Degas Assembly Calibration Fails . . . . . . . . . . . . . . . . . . . .4-11
4.8
Vacuum Degas Assembly Low Vacuum . . . . . . . . . . . . . . . . . . . . . . .4-12
4.9
Relays or TTLs Inoperative . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-12
4.10
TTL2 Output Inoperative . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-13
4.11
Poor Chromatographic Reproducibility . . . . . . . . . . . . . . . . . . . . . . .4-13
4.12
Noisy Baseline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-15
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GS50 Gradient Pump
5 • Service
5.1
Cleaning and Replacing the Check Valves . . . . . . . . . . . . . . . . . . . . . . 5-1
5.2
Replacing a Piston Seal and Piston Rinse Seal . . . . . . . . . . . . . . . . . . . 5-4
5.3
Pump Piston Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-9
5.4
Waste Valve or Priming Valve O-Ring Replacement . . . . . . . . . . . . 5-11
5.5
Proportioning Valve Assembly Replacement . . . . . . . . . . . . . . . . . . . 5-12
5.6
Changing Main Power Fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-14
5.7
Changing the GS50 Delay Volume (Optional) . . . . . . . . . . . . . . . . . . 5-15
A • Specifications
A.1
Physical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-1
A.2
Environmental . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-1
A.3
Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-1
A.4
Display and Keypad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-1
A.5
Hydraulics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-2
A.6
Control Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-3
A.7
Vacuum Degas Assembly (Optional) . . . . . . . . . . . . . . . . . . . . . . . . . .A-3
B • Installation
iv
B.1
Facility Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-1
B.2
Installation Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-2
B.2.1
Power Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-2
B.2.2
Electronics Chassis Connections . . . . . . . . . . . . . . . . . . . . . . .B-4
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Contents
B.3
B.2.3
DX-LAN Interface (Optional). . . . . . . . . . . . . . . . . . . . . . . . . B-6
B.2.4
Waste Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-7
B.2.5
Eluent Line Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-7
B.2.6
Piston Seal Wash Connections (Optional) . . . . . . . . . . . . . . . B-8
B.2.7
Priming the Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-11
Automatic SRS Power Control (Optional) . . . . . . . . . . . . . . . . . . . . B-15
C • User Interface
C.1
C.2
Operational Screens . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-2
C.1.1
Menu of Screens . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-2
C.1.2
Main Screen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-3
C.1.3
Detail Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-5
C.1.4
Method Screen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-6
C.1.5
Method Events Screen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-8
C.1.6
Degas Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-9
C.1.7
Module Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-11
C.1.8
Pump Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-12
C.1.9
Time Function In . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-13
Diagnostic Screens . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-14
C.2.1
Diagnostic Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-14
C.2.2
Power-Up Screen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-15
C.2.3
Pressure Statistics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-16
C.2.4
Usage Log . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-17
C.2.5
Diagnostic Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-18
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GS50 Gradient Pump
C.3
Calibration Screens . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-20
C.3.1
Calibration Menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-20
C.3.2
Leak Sensor Calibration and Status . . . . . . . . . . . . . . . . . . . .C-21
C.3.3
Degas Pump Calibration and Status . . . . . . . . . . . . . . . . . . . .C-22
C.3.4
Flow Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-23
C.3.5
Pressure Offset Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . .C-24
C.3.6
Pressure Ripple Calibration . . . . . . . . . . . . . . . . . . . . . . . . . .C-25
D • TTL and Relay Control
D.1
TTL and Relay Output Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D-2
D.2
TTL Input Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D-3
D.2.1
D.3
TTL Input Signal Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D-3
TTL and Relay Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D-5
D.3.1
Example Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D-6
E • Reordering Information
vi
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1 • Introduction
1.1
Overview
The GS50 Gradient Pump is a microprocessor-based eluent (or mobile phase)
delivery system. Its variable-speed, serial-piston design ensures pulse-free
pumping for the most demanding applications. The GS50 delivers mixtures of up
to four mobile phase components at precisely controlled flow rates. The selected
mobile phase composition can be delivered as isocratic, isocratic proportioned,
linear ramp, step, curved, or any combination of these. A DSP (Digital Signal
Processor) provides high speed, extremely accurate control of pump flow.
The two basic modes of pump control, Direct control and Method control, enable
the GS50 to operate either with or without reference to time-based events. The
GS50 is usually controlled:
•
Locally, from the front panel keypad and display, or
•
Remotely (via the Dionex DX-LAN™ interface), from a computer running
one of these Dionex chromatography software products: Chromeleon®
(Release 6.1 or later) or PeakNet® 6 (Release 6.1 or later).
Limited remote control is available from any device capable of providing
compatible TTL signals to the pump.
The GS50 can function as a stand-alone instrument or as part of a chromatography
system. The chromatography system may include non-Dionex instruments,
provided that they meet the GS50 interface requirements for software, TTL, or
relay control.
GS50 Options
•
Vacuum degas assembly
The vacuum degas assembly provides online degassing of up to four eluents, at
times and durations specified by the user. Dionex strongly recommends vacuum
degassing eluents in order to help prevent bubbles (caused by eluent outgassing)
from forming in the eluent proportioning valves, pump heads, and detector flow
cell. The vacuum degas assembly must be installed at the factory.
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1-1
GS50 Gradient Pump
•
Standard delay volume conversion kit
The GS50 is plumbed at the factory to ensure a delay volume of <400 µL. Dionex
offers a standard delay volume conversion kit (P/N 056968) that contains the parts
needed to replumb the pump to obtain a delay volume of <800 µL. Increasing the
delay volume will improve mixing noise at flow rates of 1.0 mL/min and above.
The pump must be replumbed at the installation site; for instructions, see
Section 5.7.
The following table lists the GS50 product versions available from Dionex.
System
GS50 with Vacuum
Degas Assembly
GS50 without Vacuum
Degas Assembly
DX-600
P/N 059481
P/N 059479
BioLC
P/N 059493
P/N 059491
NOTE The GS50 Gradient Pump is designed to perform ion
chromatography and BioLC applications only and
should not be used for any other purpose. If there is a
question regarding appropriate usage, contact Dionex.
1-2
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1 • Introduction
1.2
About This Manual
Chapter 1
Introduction
Presents a brief overview of the GS50 Gradient Pump.
Explains the meaning of safety messages and icons in the
manual and safety labels on the pump.
Chapter 2
Description
Describes physical aspects of the GS50, including the
front panel controls, rear panel connections, electronics,
and mechanical components. Describes the pump
operating modes and control modes.
Chapter 3
Operation and
Maintenance
Describes key operating features and how to create, edit,
and run methods from the GS50 front panel. Lists routine
preventive maintenance requirements.
Chapter 4
Troubleshooting
Lists possible causes of problems, as well as step-by-step
procedures to resolve them.
Chapter 5
Service
Contains step-by-step instructions for routine service and
parts replacement procedures.
Appendix A
Specifications
Appendix B
Installation
Lists the GS50 specifications and installation site
requirements.
Describes how to install the GS50.
Appendix C
User Interface
Illustrates and describes all of the screens that can be
displayed on the GS50 front panel.
Appendix D
Relay and TTL
Control
Describes Relay and TTL input and output functions;
provides setup examples.
Appendix E
Reordering
Information
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Lists spare parts for the pump.
1-3
GS50 Gradient Pump
1.2.1
Typefaces
•
Capitalized bold type indicates a front panel button:
Press Enter to begin running the method.
•
Uppercase bold type indicates the name of a menu or screen, or an onscreen entry:
Go to the METHOD screen.
Move the cursor to the EDIT field.
1.2.2
Safety Messages and Notes
This manual contains warnings and precautionary statements that can
prevent personal injury and/or damage to the GS50 when properly
followed. Safety messages appear in bold type and are accompanied by
icons, as shown below.
Indicates an imminently hazardous situation which, if not avoided, will
result in death or serious injury.
Indicates a potentially hazardous situation which, if not avoided, may
result in death or serious injury.
Indicates a potentially hazardous situation which, if not avoided, may
result in minor or moderate injury.
Indicates that the function or process of the instrument may be
impaired. Operation does not constitute a hazard.
1-4
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1 • Introduction
Messages d’avertissement en français
Signale une situation de danger immédiat qui, si elle n'est pas évitée,
entraînera des blessures graves à mortelles.
Signale une situation de danger potentiel qui, si elle n'est pas évitée,
pourrait entraîner des blessures graves à mortelles.
Signale une situation de danger potentiel qui, si elle n'est pas évitée,
pourrait entraîner des blessures mineures à modérées. Également
utilisé pour signaler une situation ou une pratique qui pourrait
gravement endommager l'instrument mais qui n'entraînera pas de
blessures.
Warnhinweise in Deutsch
Bedeutet unmittelbare Gefahr. Mißachtung kann zum Tod oder
schwerwiegenden Verletzungen führen.
Bedeutet eine mögliche Gefährdung. Mißachtung kann zum Tod oder
schwerwiegenden Verletzungen führen.
Bedeutet eine mögliche Gefährdung. Mißachtung kann zu kleineren
oder mittelschweren Verletzungen führen. Wird auch verwendet, wenn
eine Situation zu schweren Schäden am Gerät führen kann, jedoch
keine Verletzungsgefahr besteht.
Informational messages also appear throughout this manual. These are
labeled NOTE and are in bold type:
NOTE NOTES call attention to certain information. They alert
the user to an unexpected result of an action, suggest
how to optimize instrument performance, etc.
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1-5
GS50 Gradient Pump
1.3
Safety Labels
The TUV GS, C, US Mark safety label and the CE Mark label on the GS50
indicate that the GS50 is in compliance with the following standards: EN 610101:1993 (safety), CAN/CSA-C22.2 No. 1010.1-92 (safety), UL 3101-1/10.93
(safety), EN 50082-1:1992 (susceptibility), and EN 55011:1991 (emissions).
These symbols appear on the GS50 or on GS50 labels.
˜
Alternating current
Protective conductor terminal
Power supply is on
Power supply is off
1-6
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2 • Description
The GS50 Gradient Pump enclosure consists of two units:
2.1
•
The control panel is located on the door of the upper unit. The electronics
chassis, which contains the power supply and several electronics cards
(printed circuit boards), is inside the upper unit. For a description of the
control panel, see Section 2.1. For a description of the electronics, see
Section 2.2.
•
The lower unit houses mechanical components (the eluent proportioning
valves, pump heads, pressure transducer, etc.). For a description of the
mechanical components, see Section 2.3.
Front Control Panel
The control panel on the upper door of the GS50 enclosure contains a liquid
crystal display (LCD), a membrane keypad, and the actuator for the main power
switch (see Figure 2-1). The door opens to provide access to the electronics
chassis (see Section 2.2).
Screen Contrast
Information is displayed on the front panel LCD, or screen. To adjust the screen
contrast, use the knurled knob in the recess below the keypad (see Figure 2-1).
Power Switch
The main power switch for the GS50 is on the bulkhead behind the upper door of
the enclosure. An actuator for the main power switch is on the outside of the front
door, at the lower left corner (see Figure 2-1).
The actuator functions only when the door is fully closed. When the door is open,
turn the pump on and off by pressing the main power switch on the bulkhead.
To prevent damage to the pump circuitry and components, always
wait at least 15 seconds after turning off the power before turning it on
again.
Doc. 031612-03 10/03
2-1
GS50 Gradient Pump
GS50 Gradient Pump
MENU of SCREENS
1
2
3
4
MAIN SCREEN
DETAIL SCREEN
METHOD
DEGAS OPTIONS
5
6
7
8
MODULE SETUP
PUMP OPTIONS
TIME FUNCTION IN
DIAGNOSTIC MENU
Off/On
Hold/Run
7
8
9
Prime
Reset
4
5
6
Insert
Select
1
2
3
Help
Delete
Main Power
Switch Actuator
Menu
Select
Tab
(for opening
the door)
0
Enter
Knob
(for adjusting
screen contrast)
Figure 2-1. GS50 Display and Keypad Layout
2.1.1
Control Panel Keypad
Use the control panel keypad for direct control of GS50 operation or to
create and modify a programmed series of timed events, called a method.
2-2
•
Press the Menu button to display a list of screen options. To view a
screen, press the numeric button on the keypad that corresponds to the
screen number. For example, press 3 to view the METHOD screen.
•
You can edit the reverse video fields on a screen. Other fields display
information, but cannot be edited.
•
To edit a parameter, use the four directional arrow buttons to position
the cursor in the reverse video field. Use the numeric buttons to enter
a variable value. Use the Select ∆ and Select ∇ buttons to choose an
entry from among predetermined options.
Doc. 031612-03 10/03
2 • Description
•
Press Enter to execute the selected value or press an arrow button to
simultaneously confirm the selected value and move the cursor to the
next field.
•
When you press a front panel button, a high-pitched beep sounds. If
an error occurs, this beep is lower in frequency. You can disable the
beeps from the MODULE SET-UP screen (see Section C.1.7).
Button
Off/On
Prime
Insert
Function
Turns the pump motor off and on.
In Direct control (see Section 2.8), turning on the motor causes it to pump
isocratically, using the displayed eluent percentages and flow rate.
In Method control (see Section 2.8.2), turning on the motor causes it to
pump at the eluent percentages and flow rate for the elapsed time of the
selected method or, when the method clock is at INIT, at the initial
conditions.
Operates the pump in the mode reserved for priming the pump heads. If
the pump motor is off when Prime is pressed, the pump automatically
turns on. To exit the priming mode and return to the previously selected
flow rate, press Prime again or press Off/On to turn off the pump motor.
See Section B.2.7 for complete priming instructions.
Inserts a new timed step into a method. This button functions only when
the cursor is in a TIME field on either the METHOD or METHOD events
screen.
1.
Move the cursor to the TIME field and press Insert. The
new step is added after the cursor position. Parameter values
in the new step are blank.
2.
Fill in the time value and press Enter or a cursor arrow
button. Note: If you move the cursor out of the TIME field
before entering a time value, the inserted step disappears
because it is incomplete.
3.
Insert steps in any order. When you press Enter, the GS50
Moduleware organizes steps in the correct chronological
order.
Table 2-1. GS50 Front Panel Buttons
Doc. 031612-03 10/03
2-3
GS50 Gradient Pump
Button
Delete
Hold/Run
Reset
Function
Delete performs these functions:
•
•
•
Cancels an entry that is in progress and restores the previous value.
Returns a field to its default value (if no entry is in progress).
“Blanks” the parameter value for a method step. On the METHOD
screen, move the cursor to a step entry field, press Delete once, and
move the cursor out of the field. The field remains blank, indicating
that the value entered for the previous step is still in effect.
•
Deletes a method step. On the METHOD screen, move the cursor to
the TIME field for the step to be deleted and press Delete twice.
Note: If you accidentally press Delete once, immediately press any
button except Delete to restore the original time and step
parameters.
•
Deletes an entire method. On the METHOD screen, move the cursor
to the TIME field of the INIT step and press Delete twice.
Turns the method clock off (Hold) and on (Run). This button functions
only when the pump is under Method control (see Section 2.8.2).
When the method clock is in Hold, pressing Hold/Run starts the clock.
The clock starts at the initial step of a new method or, if resuming an
interrupted method, at the time the clock was put in Hold.
When the method clock is in Run, pressing Hold/Run stops the clock;
this “holds” the method and freezes the current conditions.
Changes the method clock time to INIT and causes the initial conditions
specified by the method to occur. This button functions only when the
pump is in Method control (see Section 2.8.2).
If the method is running, it continues running. If the method is on hold,
the method maintains the initial conditions.
Table 2-1. GS50 Front Panel Buttons (Continued)
2-4
Doc. 031612-03 10/03
2 • Description
Button
Select
Function
•
The Select buttons step through predetermined options in entry
fields. In a field with predetermined numeric choices, pressing
Select ∆ increases the value by one unit, pressing Select ∇ once
decreases the value by one unit, and holding down a Select button
increases (or decreases) the value. To confirm the selected value,
press Enter or a cursor arrow button.
•
When the GS50 is running under Method control (see Section 3.3),
pressing a Select button when the cursor is in the elapsed time field
steps you through the programmed steps in the method that is
currently running.
•
Pressing an arrow button moves the cursor, in the direction of the
arrow, to the next entry field (if one exists). At the end of a line, the
left arrow wraps the cursor around to the next entry field on the line
above; the right arrow wraps the cursor to the next entry field on the
line below. The up and down arrows do not wrap around.
•
Pressing an arrow button immediately after entering or selecting a
new value in an entry field saves and/or executes the new value (just
as pressing Enter does), except when the cursor is in the following
locations: DIAGNOSTIC TEST screen fields, SAVE TO and RUN
fields on the METHOD screen, CALIBRATION screen fields, and
Menu fields.
Select
Help
Menu
Displays context-sensitive help information, if available.
•
When an operational screen is displayed, pressing Menu displays the
MENU of SCREENS.
•
When a diagnostic screen is displayed, pressing Menu displays the
DIAGNOSTIC MENU.
•
When a calibration screen is displayed, pressing Menu displays the
CALIBRATION MENU. Note: The Menu button is disabled when a
pressure ripple calibration sequence is running (see Section C.3.6).
Table 2-1. GS50 Front Panel Buttons (Continued)
Doc. 031612-03 10/03
2-5
GS50 Gradient Pump
Button
1
Enter
Function
Pressing a numeric button enters a numeric value into the current entry
field. When a menu is displayed, pressing the numeric button that
corresponds to a menu option displays the screen.
Enter performs these functions:
•
Saves and/or executes changes made in entry fields (except on the
METHOD screen). On the METHOD screen, pressing Enter saves
entries to an edit copy. To save editing changes to a permanent
method, move the cursor to the SAVE TO field, enter the method
number, and press Enter.
•
When a menu is displayed, pressing Enter opens the highlighted
screen.
Table 2-1. GS50 Front Panel Buttons (Continued)
2-6
Doc. 031612-03 10/03
2 • Description
2.1.2
Display Screens
When the pump powers up and passes all diagnostic tests, the POWER-UP
screen (see Figure 2-2) is displayed briefly, followed by the MAIN screen
(see Figure 2-3). If a diagnostic test fails, the DIAGNOSTIC TEST screen
appears instead of the MAIN screen; see Section C.2.5 for details.
GS50 GRADIENT PUMP
DSP
BIOS nn.nn
*MAIN nn.nn
nn.nn
MODULEWARE REV
nn.nn
BIOS REV
DX-LAN ID# nnnnnn
Help prompt
Figure 2-2. Power-Up Screen
100.0 %A
0.0 %B
0.0 %C
0.0 %D
Help prompt
LOAD
COLUMN A
LOCAL
2000 PSI
2.00 mL/MIN
10.27 MIN
METHOD 2
Figure 2-3. Main Screen
NOTE You can check the information on the POWER-UP
screen whenever you wish by selecting the screen
from the DIAGNOSTIC MENU (see Section C.2.1).
The MAIN screen displays status information in enlarged characters to
enable you to view the screen from a distance. Use the MAIN screen to
select the flow rate, operating mode, percentage of eluents to run, and
other operating parameters.
Doc. 031612-03 10/03
2-7
GS50 Gradient Pump
To access the remaining GS50 screens, press the Menu button to display
the MENU of SCREENS (see Figure 2-4).
MENU of SCREENS
1 MAIN SCREEN
2 DETAIL SCREEN
3 METHOD
4 DEGAS OPTIONS
5 MODULE SETUP
6 PUMP OPTIONS
7 TIME FUNCTION IN
8 DIAGNOSTIC MENU
Help prompt
Figure 2-4. Menu of Screens
There are two ways to view a screen option:
•
Press the numeric button on the GS50 front panel keypad that
corresponds to the screen number on the menu. For example, press 3
to select and display the METHOD screen.
•
Move the cursor to the field containing the screen number and press
Enter.
See Appendix C for a description of these screens.
2-8
Doc. 031612-03 10/03
2 • Description
2.2
Electronics Chassis
The GS50 electronics chassis contains the power supply and several electronics
cards (printed circuit boards) required for pump control (see Figure 2-5).
Connectors on the electronics cards enable the GS50 to communicate with other
Dionex modules.
The electronics chassis is located behind the upper door of the GS50 enclosure. To
open the door, pull on the tab located to the right of the main power actuator (see
Figure 2-1).
Do not remove any of the electronics cards from the GS50. The
components on the cards cannot be serviced by the user. If servicing
is required, it must be performed by qualified personnel and
appropriate electrostatic discharge (ESD) handling procedures must
be followed.
Ne retirez aucune des cartes électroniques de la pompe. Aucun des
composants sur les cartes ne peut être réparé par l'utilisateur. Toute
réparation doit être effectuée par un personnel qualifié utilisant des
procédures correctes de décharge électrostatique.
Halten Sie sich von der Elektronik des GS50 fern. Die Elektronik kann
nicht vom Anwender gewartet werden. Falls ein Service erforderlich
ist, ist dieser von qualifiziertem Personal durchzuführen. Dabei
müssen die geeigneten Verfahren zur elektrostatischen Entladung
(ESD) eingehalten werden.
LC LEAK
The leak control cable from the LC10 Chromatography Organizer or the LC20
Chromatography Enclosure connects to the LC LEAK connector in slot 1 of the
GS50 electronics chassis. If a leak occurs in the LC10 or LC20, it is reported to
the pump.
NOTE Do not connect the LC25 Chromatography Oven or the
LC30 Chromatography Oven to the LC LEAK connector.
These ovens contain internal leak control electronics.
Doc. 031612-03 10/03
2-9
GS50 Gradient Pump
SLOT 1
GS50/IS25-DSP
PWR SPY
130W
L
C
L
C
L
C
L
E
A
K
C
O
M
M
A
I
R
P4
P3
P2
1
3
P
I
N
D
I
S
T
DIST
MOTOR
1
2
P5
P
I
N
P8
SLOT 3
BLANK
SLOT 4
TTL/RELAY
D
I
S
T
P6
PRES
SLOT 2
BLANK
SLOT 5
CPU/LAN
RLY-1
OUT
RLY-2
OUT
+
+
+
+
+
+
-
TTL-1
OUT
TTL-2
OUT
TTL-1
IN
TTL-2
IN
F
R
O
N
T
P
A
N
E
L
TTL-3
IN
TTL-4
IN
P7
POWER SUPPLY
GREEN - OK
RED - FAULT
Figure 2-5. GS50 Electronics Chassis
LC COMM
The LC30 Chromatography Oven's RJ-11 serial cable connects to the LC COMM
connector in slot 1 of the GS50 electronics chassis. When connected here, the
LC30 can be remotely controlled by a host computer running Chromeleon or
PeakNet 6 software.
LC AIR
The cable from the air solenoid valves on the LC10, LC20, LC25, or LC30
connects to the LC AIR connector in slot 1 of the GS50 electronics chassis. When
connected here, the GS50 can electrically actuate the solenoid valves that control
the positions of the injection valve and the optional column switching valve.
To select the valve positions, go to either the MAIN screen (see Section C.1.2) or
the METHOD screen (see Section C.1.4).
2-10
Doc. 031612-03 10/03
2 • Description
PRES
The PRES (pressure output) connector in slot 1 of the GS50 electronics chassis
records changes in the pump operating pressure. The connector is for test
purposes only.
To check the pressure, insert the plug (P/N 923617) provided in the GS50 Ship Kit
(P/N 061222) into the PRES connector. (Pin 1 of the connector is Signal (pressure)
and pin 2 is Ground.) Connect the other end of the plug to one of the following: a
recorder, a Dionex UI20 Universal Interface, or an A/D converter. The output
signal is equivalent to 1 mV/psi (i.e., 1000 psi = 1 volt out).
TTL/RELAY
A strip of eight relay and TTL connectors is located in slot 4 of the GS50
electronics chassis. These connectors interface with other devices for relay and
TTL control of the pump. Refer to Appendix D for more information.
CPU/LAN Card
Control Moduleware for the pump resides on the CPU/LAN card located in slot 5
of the GS50 electronics chassis.
A 60-pin ribbon cable links the CPU logic to the front panel display and keypad.
The logic monitors the internal power supply output. The color of the LED at the
bottom of slot 5 indicates the status of the power supply output:
2.3
•
A green LED indicates normal operation.
•
A red LED indicates a power fault. When a power fault occurs, the GS50
enters a diagnostic state and inhibits all other controls until the fault is
corrected. If this occurs, turn off the power for a few seconds and then turn it
on again.
Mechanical Chassis
The GS50 mechanical chassis is housed in a drawer located behind the lower door
of the enclosure. Open the mechanical chassis drawer only when components
inside the drawer require servicing. Before resuming routine operation, push in
the drawer and tighten the lock in the lower right corner of the chassis.
Doc. 031612-03 10/03
2-11
GS50 Gradient Pump
Observe the warning label on the inside of the lower door. The arrows
on the label indicate moving mechanical parts that present pinch
hazards when the pump is on and the mechanical chassis drawer is
open. Do not operate the pump when the chassis drawer is pulled out.
Respectez l'étiquette d'avertissement apposée à l'intérieur de la porte
inférieure. Les flèches sur l'étiquette indiquent des pièces
mécaniques mobiles qui posent un danger de pincement lorsque le
GS50 est sous tension et le tiroir mécanique est ouvert. N'utilisez
jamais le GS50 avec le tiroir du châssis mécanique ouvert.
Beachten Sie den Warnhinweis auf der Innenseite der unteren Tür. Die
Pfeile auf dem Aufkleber weisen auf bewegliche mechanische Teile
hin. Bei eingeschalteter Pumpe und geöffneter Mechanik besteht hier
die Gefahr von Quetschungen. Die Pumpe darf nicht mit
herausgezogenem Mechanikeinschub betrieben werden.
2.4
Interior Components
2.4.1
Pump Heads
Primary Pump Head
The primary head pumps the selected mobile phase into the secondary
head (see Figure 2-6). The inlet and outlet check valves are located on the
bottom and top, respectively, of the primary pump head. The priming
valve is on the front of the pump head.
To open the priming valve, turn the knob one-quarter to one-half turn
counterclockwise. When the priming valve is opened, liquid can flow into
and out of the primary pump head via the port in the front of the valve
(see Figure B-4).
NOTE The priming valve must be open when the pump is
being primed with a syringe or with isopropyl
alcohol. For detailed priming instructions, see
Section B.2.7.
2-12
Doc. 031612-03 10/03
2 • Description
Outlet Check Valve
Gradient Mixer
Primary
Drain Spacer Pump Head
Tube
IN
OUT
Secondary
Pump Head
Acorn Nut
Acorn Nut
Inlet
Check
Valve
Waste Valve
Proportioning
Valve
Priming
Valve
Pressure
Transducer
Leak
Sensor
Waste Line
Figure 2-6. GS50 Mechanical Components
Secondary Pump Head
The secondary pump head delivers eluent to the remainder of the
chromatography system (the injection valve, column, and detector). The
waste valve is located on the front of the secondary pump head (see
Figure 2-6).
To open the waste valve, turn the knob one-quarter to one-half turn
counterclockwise. When the waste valve is in the open position, all output
is directed to waste.
NOTE The waste valve must be open when the pump is
being primed. For detailed priming instructions, see
Section B.2.7.
Doc. 031612-03 10/03
2-13
GS50 Gradient Pump
Piston Seal Wash
The GS50 includes a piston seal wash assembly that can be set up to
continuously rinse the back of the piston seals. Rinsing the piston seals
removes salt crystals that can abrade the pistons, thereby causing the main
piston seals to wear out prematurely and allow leaks. To use the seal wash
feature, an external water source must be connected. See Section B.2.6
for connection instructions.
For continued protection of the pump, replace the piston rinse seal and the
O-rings in the seal wash assembly (see Section 5.2) every 6 months, or
whenever you replace the main piston seals for the GS50.
Proportioning Valves
Mobile phase flows from the eluent reservoirs, through the vacuum degas
chambers (if the optional vacuum degas assembly is installed), and into
the four-way proportioning valve assembly (see Figure 2-6). Programmed
percentages of each eluent are proportioned in the four valves.
2.4.2
Pressure Transducer
Flow exiting the secondary pump head is directed to the pressure
transducer (see Figure 2-6), which measures the system pressure. The
DSP (digital signal processor) firmware precisely controls the pump
motor speed to ensure flow rate accuracy and to maintain constant flow
and constant pressure.
Flow output from the pressure transducer continues to the gradient mixer
(see Section 2.4.3). From there, it is directed to the remainder of the
chromatography system (the injection valve, column, and detector).
2.4.3
Gradient Mixer
A GM-4 Gradient Mixer (P/N 049136) is installed between the pressure
transducer and the injection valve (see Figure 2-6). The mixer helps to
ensure that proportioned eluents are mixed thoroughly.
NOTE If you replumb the GS50 for the standard delay
volume (see Section 5.7), replace the GM-4 with a
GM-5 Gradient Mixer (P/N 054044).
2-14
Doc. 031612-03 10/03
2 • Description
2.4.4
Flow Path
Figure 2-7 shows the liquid flow path through the pump.
Mobile phase flows from the reservoir(s) and through the vacuum degas
chambers (if the vacuum degas assembly is installed). The selected
proportions of mobile phase flow out of the proportioning valves, through
a tubing assembly, and to the inlet check valve on the primary pump head.
(The tubing assembly helps to ensure proper delivery, mixing, and
damping of the mobile phase.)
The inlet check valve opens, drawing solvent into the primary pump head.
At the same time, the secondary piston pushes forward, pushing solvent
into the system. After completing the intake, the primary piston (moving
at approximately twice the speed of the secondary piston) pushes solvent
through the outlet check valve and into the secondary pump head.
The secondary head draws approximately 50% of the volume displaced
by the primary piston; the remaining 50% is delivered directly into the
system. The secondary piston delivers the drawn volume into the system
during the intake of the primary piston. From the secondary head, flow is
directed through the pressure transducer and then the gradient mixer.
Figure 2-7. Flow Schematic
Doc. 031612-03 10/03
2-15
GS50 Gradient Pump
2.5
Vacuum Degas Assembly (Optional)
The vacuum degas assembly provides online degassing of up to four eluents, at
times and durations specified by the user. The degas assembly, which must be
installed in the GS50 at the factory, consists of:
•
A four-channel degas chamber (with degas membranes) with internal capacity
of 17 mL per channel
•
A dual-stage diaphragm vacuum pump
•
A solenoid valve
•
An on-board vacuum sensor
•
The electronics required to operate the vacuum pump
•
Tubing, fittings, and other accessories
By default, the degas pump turns on for 2 minutes when the GS50 power is turned
on. Thereafter, the degas pump turns on for 30 seconds at 10-minute intervals. If
necessary, go to the MENU of SCREENS, select the DEGAS OPTIONS screen (see
Section C.1.6), and reset the cycle time and duration.
NOTE The DEGAS OPTIONS screen cannot be selected unless
the vacuum degas assembly is installed. If necessary, go
to the PUMP OPTIONS screen (see Section C.1.8) and
check the DEGAS PUMP OPTION field; if the GS50
contains a vacuum degas assembly, the field indicates
YES.
To check the vacuum chamber pressure, go to the CALIBRATION MENU and select
the DEGAS PUMP CALIBRATION AND STATUS screen (see Section C.3.3).
2-16
Doc. 031612-03 10/03
2 • Description
2.6
Eluent Reservoirs
NOTE Dionex strongly recommends vacuum degassing and
filtering all eluents to help prevent bubbles,
contaminants, and particles from passing through the
system. Filtering eluents also helps reduce baseline noise
and ensure system stability.
NOTE Although the GS50 does not require pressurized
reservoirs, Dionex recommends pressurizing the
reservoirs if eluents are manually degassed (see
Section 3.1.1) or if eluents are sensitive to carbonate
(NaOH) contamination. For more details, see the
Pressurizable
Reservoir
Installation
Instructions
(Document No. 034581).
The following pressurizable reservoirs are available from Dionex:
•
1-liter glass reservoir with shatterproof plastic coating (P/N 044126)
•
2-liter glass reservoir with shatterproof plastic coating (P/N 044127)
•
1-liter plastic reservoir (P/N 044128)
•
2-liter plastic reservoir (P/N 044129)
Do not use the 2-liter plastic reservoir (P/N 044129) for offline vacuum
degassing of eluents. The reservoir was not designed for this
purpose.
N'utilisez pas le réservoir en plastique de 2 litres (N/P 044129) pour le
dégazage à vide hors ligne d'éluants. Le réservoir n'a pas été conçu à
cette fin.
Verwenden Sie den 2-Liter Plastikbehälter (Bestell-Nr. 044129) nicht
zum Offline Vakkum-Entgasen von Eluenten. Der Behälter ist dafür
nicht ausgelegt.
Refer to the Pressurizable Reservoir Installation Instructions (Document No.
034581) for installation details.
Doc. 031612-03 10/03
2-17
GS50 Gradient Pump
EO1 Eluent Organizer (Optional)
The Dionex E01 Eluent Organizer (P/N 044125) holds the eluent reservoirs in a
liner that contains spills and leaks. The EO1 can also be used to pressurize the
reservoirs.
Up to two EO1 Organizers can be placed on top of the system enclosure. The EO1
can accommodate either one or two reservoirs, depending on whether the
reservoirs are made of glass or plastic (see the table below for details).
2.7
Number of
Reservoirs
Type of Reservoir
Total Volume
2
Glass or plastic, 1-liter
2 liters
2
Plastic, 2-liter
4 liters
1
Glass, 2-liter
2 liters
Rear Panel
The rear panel of the GS50 contains the main power receptacle and fuses. It also
includes a connector for installation of the DX-LAN interface. For an illustration
of the rear panel, see Figure B-1 in Appendix B.
2-18
Doc. 031612-03 10/03
2 • Description
2.8
Functional Description
There are three ways to operate the GS50:
•
In Local mode, use the front control panel buttons and screens to select
operating parameters. See Section 2.8.1 for a description of Local mode.
•
In Locked Remote mode, use Chromeleon or PeakNet 6 to send operating
commands from the host computer via the DX-LAN. See Section 2.8.1 for a
description of Locked Remote mode.
•
With TTL input, a controlling device (for example, an integrator or another
module) sends TTL signals to the pump. The TTL input signals can be used to
trigger the following functions: turn the pump motor on/off and set the
method clock to hold/run. All other pump operating parameters must be set
locally from the control panel. See Appendix D for more information about
TTL control.
To select the operating mode:
1. Go to either the MAIN or DETAIL screen.
2. The operating mode field displays either LOCAL or REMOTE (see Figure 2-8).
To change the mode, move the cursor to this field, press Select ∆ or Select ∇
to toggle to the desired mode, and press Enter or a cursor arrow button. (For
TTL input control, select Local mode.)
100.0 %A
0.0 %B
0.0 %C
0.0 %D
Help prompt
LOAD
COLUMN A
LOCAL
2000 PSI
2.00 mL/MIN
10.27 MIN
METHOD 2
Figure 2-8. Main Screen
Doc. 031612-03 10/03
2-19
GS50 Gradient Pump
In addition to the operating modes, two control modes are available from the
GS50 front panel:
•
In Direct control, commands are executed immediately when entered.
Because there is no time-based program, the method clock is not used and the
Hold/Run and Reset buttons do not operate.
•
In Method control, commands are executed according to the timed steps in a
method programmed from the front panel. See Section 2.8.2 for details about
Method control.
To select the control mode (front panel control):
1. Go to either the MAIN or DETAIL screen.
2. The control mode field displays either DIRECT CNTRL or METHOD (see
Figure 2-8). To change the mode, move the cursor to this field, press Select ∆
or Select ∇ to toggle to the desired mode, and press Enter or a cursor arrow
button.
The table below summarizes the operating and control mode configurations for
the GS50.
2-20
Operating/Control Mode
Pump Operation
Local/Direct
Commands are entered from the front panel and
executed immediately after being entered.
Local/Method
Commands are entered from the front panel and
executed by running a method programmed from the
front panel or through a TTL input.
Locked Remote/Direct
Commands are sent from Chromeleon or PeakNet 6 and
executed immediately when received.
Doc. 031612-03 10/03
2 • Description
2.8.1
Operating Modes
Local Mode
When the GS50 power is turned on, the pump is in Local mode (see
Figure 2-8). In Local mode, the pump accepts operating commands from
two sources:
•
Direct input from the front panel keypad and screens. All operating
functions are available.
•
TTL inputs from a remote controller, such as an integrator or another
module. The TTL input signals can be used to turn the pump motor on
and off or to set the method clock to hold or run.
Locked Remote Mode
In Locked Remote mode, the GS50 accepts operating commands from the
host computer and Chromeleon or PeakNet 6 software via the DX-LAN.
When the GS50 is controlled by Chromeleon or PeakNet 6, connecting
the pump to the timebase automatically selects the Locked Remote
operating mode. In this mode, time-based steps for the software are
executed on the server, and the software then sends operating commands
directly to the pump. All operating changes from the GS50 front panel are
disabled.
To return the GS50 to Local mode, clear the Connect check box on the
GS50 control panel in Chromeleon or PeakNet 6. To return to remote
mode, select the Connect check box.
2.8.2
Method (Front Panel) Control
In Method control, commands are executed according to the time-based
steps programmed in a method. Each step specifies the eluent
composition and flow rate delivered by the pump at a given time. The
selected eluent mixture can be delivered isocratically, or as a multistep
linear or curved gradient. As the method runs, the GS50 calculates the
changes in eluent composition required to deliver a gradient from one
method step to the next or to match the selected curve.
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GS50 Gradient Pump
Methods are created, saved, and edited on the METHOD screen (see
Figure 2-9). See Section 3.3 for programming instructions.
SAVE TO 6
0 - 5000 PSI
LIMITS
%C
%B
%D
C V
>
25.0
L
25.0 25.0
>
I
>
22.2 32.2
36.5 5 L
>
30.0
19.6 33.2
METHOD EDIT 5
TIME %A
^
INIT 25.0
0.00 100.0
123.45 10.0
^
345.67 3.00
17.2
Help prompt
Figure 2-9. Method Screen
In summary:
2-22
•
The GS50 can store up to 100 methods (0 through 99) in memory.
The actual total, which is usually less than 100, depends on the size of
each method and the amount of available memory.
•
Each method can include up to 50 time-based steps. Each step
specifies a time, an eluent composition, a gradient curve number, an
injection valve position, and a flow rate. Step 1 always starts at INIT
(initial condition). Step 2 always starts at TIME = 0.0.
•
Methods are retained in memory after the pump is powered down.
•
The pump can continue running under method control while you
enter or edit another method.
•
When you save changes to the currently running method or switch to
a different method, the method clock continues running, unaffected.
Only those parameter changes which affect the method after the
current time will be implemented in the current run.
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2 • Description
2.8.3
Eluent Delivery
Isocratic Eluent Run
The simplest use of the GS50 is to deliver an isocratic (unchanging)
mixture of one or more eluents. If more than one eluent is selected, the
pump delivers a proportional mixture of the eluents based on the
percentage of each eluent selected. The combined percentages of all
eluents selected must total 100%, or the pump will not run. See
Section 3.4.1 for an example of an isocratic method.
Gradient Eluent Run
The GS50 can produce step, linear, concave, or convex curves in eluent
concentration over a specified time period. The slope of the gradient is
determined by the selected gradient curve (see Figure 2-10) and the time
between the starting and ending points of a gradient step.
Remember these key points:
•
The curve number parameter determines whether the pump delivers a
linear or curved gradient. For an example of a linear gradient method,
see Section 3.4.2. For an example of a curved gradient method, see
Section 3.4.3.
•
Curve numbers are defined as follows:
Curve Number
Gradient Type
1, 2, 3, 4
Convex
5
Linear (power-up default)
6, 7, 8, 9
Concave
NOTE A curve number in a step instructs the pump to use
the selected curve number when moving to that step
from the previous step. Because the INIT and
TIME=0.0 steps are not preceded by any steps, you
cannot enter curve numbers for them.
•
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Curve 5 (the default setting) represents a linear gradient; therefore,
the gradient slope does not change during a step if curve 5 is selected.
2-23
GS50 Gradient Pump
•
Convex curves cause rapid changes in eluent composition at the
beginning of the curve and slower changes at the end. Concave curves
cause slower changes at the beginning of the curve and rapid changes
at the end.
•
Slope changes over time become more extreme, as curves go from 6
to 9 (more concave) and from 4 to 1 (more convex). Figure 2-10
shows the eluent composition profiles corresponding to curves 1
through 9, normalized for 0% to 100% for 10 minutes.
•
Any consecutive method steps that specify identical eluent
compositions will generate an isocratic segment, regardless of the
curve number selected.
•
A step gradient change is a steep linear change from one eluent to
another. A step change occurs automatically if the time interval
between two steps is less than 0.1 minute (6 seconds).
1.0
.9
1
2
.8
3
.7
4
.6
5
6
.5
7
.4
8
.3
9
.2
.1
0
0
1
2
3
4
5
6
7
8
9
10
Figure 2-10. Eluent Composition Profile for Curves 1–9
2-24
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3 • Operation and Maintenance
3.1
Getting Ready to Run
NOTE The GS50 Gradient Pump is designed to perform ion
chromatography and BioLC applications only and
should not be used for any other purpose. If there is a
question regarding appropriate usage, contact Dionex.
3.1.1
Degas Eluents
Eluent quality significantly affects the performance of the GS50. To
ensure optimal pump performance, observe these precautions:
•
Dionex strongly recommends vacuum degassing all eluents. This
helps prevent bubbles (caused by eluent outgassing) from forming in
the eluent proportioning valves, pump heads, and detector cell.
Degassing is especially important when combining aqueous and
nonaqueous components (for example, water and acetonitrile).
•
The optional vacuum degas assembly provides programmable, online
degassing of up to four eluents (see Section 2.5). The vacuum degas
assembly must be installed in the GS50 at the factory. If your GS50
does not include this option, manually degas eluents daily (following
the instructions below) and store eluents in pressurized reservoirs.
Manual Degassing of Eluents
1. Prepare the eluent required for the application.
2. Pour the eluent into a vacuum flask and attach the flask to a vacuum
pump or water aspirator.
3. Vacuum degas the eluent for 5 to 10 minutes by shaking or sonication.
4. Remove the flask from the vacuum. Do not allow water to flow
from the aspirator back into the flask.
5. Pour the degassed eluent into a pressurizable reservoir. Do not shake
the eluent.
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3-1
GS50 Gradient Pump
6. Install end-line filters on each eluent line (see Section 3.1.2).
7. Pressurize the reservoirs (see Section 3.1.3).
3.1.2
Filter Eluents
Before beginning an analysis, always filter eluents. Filtering removes
small particulates in the eluent that may contaminate the pump check
valves or the eluent proportioning valves and cause erratic flow rates or
loss of prime. All Dionex pressurizable reservoir Ship Kits include endline filters for this purpose.
Before installation, thoroughly rinse the end-line filters (P/N 045987)
with deionized water to remove any loose particles. Install a filter on the
end of each eluent line, inside the reservoir.
Verify that the end of each filter extends to the bottom of the reservoir and
that each filter is submerged in eluent. This prevents air from being drawn
through the line. For more details, refer to the Pressurizable Reservoir
Installation Instructions.
3.1.3
Pressurize Eluent Reservoirs
NOTE Although the GS50 does not require pressurized
reservoirs, Dionex recommends pressurizing the
reservoirs if eluents are manually degassed (see
Section 3.1.1) or if eluents are sensitive to carbonate
(NaOH) contamination. For more details, refer to
the Pressurizable Reservoir Installation Instructions.
1. Install the pressurizable reservoirs above the pump.
2. Install a regulator (P/N 046594) on the gas supply line to the
reservoirs.
3. Turn on the gas supply and adjust the pressure to 55 kPa (8 psi).
Never pressurize eluent reservoirs above 69 kPa (10 psi). Pressurizing
reservoirs above this limit can cause the reservoir to explode.
3-2
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3 • Operation and Maintenance
Ne mettez jamais les réservoirs d'éluants sous une pression
supérieure à 69 kPa (10 lb/po²).
Setzen Sie den Eluentbehälter auf keinen Fall einem Druck über
69 kPa aus.
3.1.4
Start-Up
1. Turn on the main power switch.
2. The POWER-UP screen appears briefly (see Figure 2-2), and is then
replaced by the MAIN screen (see Figure 2-3).
NOTE If a power-up diagnostic test fails, the DIAGNOSTIC
TEST screen appears instead of the MAIN screen. See
Section C.2.5 if this occurs.
3. If one of the following conditions applies, prime the pump (see
Section B.2.7):
•
The eluent has been changed,
•
The eluent line is new (empty),
•
The eluent line contains air, or
•
The pressure display is unstable.
4. Select the flow rate required for your application.
5. Press Off/On to start the pump flow.
6. Check the pressure reading on the MAIN screen. The display is
updated once per pump cycle; a variation of more than 3% from one
pressure reading to the next indicates that the pump is out of prime.
See Section 4.1 for conditions that cause the pump to lose prime.
NOTE After starting the pump or changing the flow rate,
wait at least 5 minutes (longer for flow rates below
1.0 mL/min) before beginning an analysis. This
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3-3
GS50 Gradient Pump
allows the digital signal processor (DSP) program to
stabilize the flow rate.
3.1.5
Selecting the Pressure Limits
The high and low pressure limits automatically stop the pump when a
system malfunction occurs, such as overpressurization caused by a
blockage or low pressure caused by a leak downstream from the pump.
•
When pump operation is being controlled by Chromeleon or PeakNet
6, select the pressure limits from the software.
•
When the pump is running under Local Direct control, enter the
pressure limits on the DETAIL screen (see Figure 3-1).
•
When the pump is running under Method control, enter the pressure
limits on the METHOD screen (see Figure 3-5). The limits are set in the
INIT step of the Method and remain the same throughout the analysis.
When a limit trip stops the pump, the method clock immediately stops
and goes to Hold. The front panel displays the current status of the
program that was running when the pressure limit was tripped.
To select the pressure limits from the front panel:
1. Go to the DETAIL or METHOD screen and move the cursor to the
LIMITS field (see Figure 3-1).
DETAIL SCREEN
100.0 %A
2125 PSI
0.0 %B
2.00 mL/MIN
0.0 %C
INJECT SAMPLE
0.0 %D
COLUMN A
LIMITS 1200-1900 PSI
LOCAL
DIRECT CNTRL
0
1
0
1
Help prompt
Figure 3-1. Detail Screen: Setting Pressure Limits
3-4
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3 • Operation and Maintenance
2. Enter a low pressure limit between 1.4 and 2.8 MPa (200 and
400 psi). The setting depends on the system operating pressure.
NOTE To prevent the low pressure limit from being
tripped each time the GS50 power is turned on, the
limit is inactive for the first several piston strokes. If
a break occurs after this period, the low pressure
limit is activated instantaneously.
3. Enter a high pressure limit that is 3.4 MPa (500 psi) higher than the
low pressure limit and 2.8 to 3.4 MPa (400 to 500 psi) above the
normal system operating pressure.
NOTE The GS50 is equipped with a pressure alarm limit
that prevents pump operation above 35 MPa
(5076 psi).
3.1.6
Calibrating the Pressure Ripple
During GS50 operation, a slight, momentary change in pressure, known
as a pressure ripple, occurs each time one piston moves forward as the
other piston moves backward. This pressure ripple during the transition
between pistons is characteristic of dual-piston pumps and is not a defect.
Before beginning routine operation with the GS50, calibrate the pressure
ripple to optimize pump operation. The calibration procedure forces the
pump to “learn” the specific operating parameters for your application;
this will minimize both baseline noise and the pressure ripple.
To calibrate the pressure ripple:
1. Check that all normal operating conditions for the application are in
effect: the separator and guard columns are installed, the appropriate
flow rate is selected, etc.
2. Press Off/On to start the pump flow. Run the pump for at least
10 minutes before going on to Step 3 and starting the calibration.
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3-5
GS50 Gradient Pump
3. Go to the CALIBRATION MENU and select the PRESSURE RIPPLE
CALIBRATION screen (see Figure 3-2).
PRESSURE RIPPLE CALIBRATION
CALIBRATION: READY
DURATION:
xxx.xx min
Help prompt
Figure 3-2. Pressure Ripple Calibration Screen
4. Move the cursor to the CALIBRATION field. Toggle the field from
READY to CALIBRATE, and then press Enter to start the calibration.
At a flow rate of 1.0 mL/min, it takes about 13 minutes to run the
calibration sequence. The DURATION field reports how much time
remains until the calibration is finished.
5. When the calibration sequence is complete, press Menu twice to exit
the PRESSURE RIPPLE CALIBRATION screen and return to the MENU
of SCREENS.
NOTE For more information about the PRESSURE
RIPPLE CALIBRATION screen, see Section C.3.6.
3-6
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3 • Operation and Maintenance
3.2
Running Under Direct Control
When the Direct control operating mode is selected, commands are carried out
immediately after they are entered and the selected operating parameters remain
in effect until commands to change them are issued. This section describes the two
types of Direct Control: Locked Remote and Local.
3.2.1
Locked Remote Direct Control
When the GS50 is controlled by either Chromeleon or PeakNet 6
software, connecting the pump to the timebase automatically selects the
Locked Remote operating mode. After time-based steps for the software
are executed on the server, the software sends operating commands
directly to the pump. All operating changes from the GS50 front panel are
disabled.
To return the GS50 to Local mode, clear the Connect check box on the
GS50 control panel in Chromeleon or PeakNet 6. To return to remote
mode, select the Connect check box.
For more information, refer to the online Help or the software user’s
guide.
3.2.2
Local Direct Control
To select Local Direct control, go to the MAIN or DETAIL screen.
•
If DIRECT CNTRL is displayed, the GS50 is already in Direct control
mode and no further action is necessary.
•
If METHOD is displayed, move the cursor to METHOD and press
Select ∆ or Select ∇ to toggle to DIRECT CNTRL. Press Enter or a
cursor arrow button to activate the selection.
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3-7
GS50 Gradient Pump
Local Direct Control Example
Specify an isocratic mixture of 60% eluent A, 25% eluent B, and 15%
eluent C to be pumped at 1.0 mL/min (see Figure 3-3).
Figure 3-3. Isocratic Run Profile
1. Go to the MAIN or DETAIL screen. Figure 3-4 illustrates the MAIN
screen as it appears when the example is set up.
60.0 %A
25.0 %B
15.0 %C
0.0 %D
Help prompt
LOAD
COLUMN A
LOCAL
2000 PSI
2.00 mL/MIN
DIRECT CNTRL
Figure 3-4. Main Screen: Running Under Local Direct Control
2. Check that the operating fields are set to LOCAL and DIRECT CNTRL.
If REMOTE or METHOD is selected, move the cursor to the appropriate
field, press Select ∆ or Select ∇ to toggle the value, and press Enter
or a cursor arrow button.
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3 • Operation and Maintenance
3. Move to the %A field and enter 60. Move to the %B field and enter 25.
Move to the %C field and press Enter (do not enter a value).
When you press Enter, the Moduleware automatically calculates the
percentage required to make the total of all eluents equal 100. In this
example, eluents A and B already total 85% (60 + 25 = 85), so the
Moduleware will specify 15% of eluent C (100–85 = 15).
4. Move to the mL/MIN field and enter 1.
5. If the pump is off, press Off/On to turn on the motor and begin the
isocratic delivery.
NOTE After starting the pump or changing the flow rate,
wait at least 5 minutes (longer for flow rates below
1.0 mL/min) before starting an analysis. This delay
allows the digital signal processor (DSP) program to
stabilize the flow rate.
3.3
Running Under Method (Front Panel) Control
Method control is used primarily when the GS50 must communicate with nonDionex software or when the pump is under integrator control. This section
presents an overview of how to create, edit, and run methods from the GS50 front
panel; for step-by-step examples, see Section 3.4.
When entering parameters on the METHOD screen, observe these guidelines:
•
After starting the pump or changing the flow rate, wait at least 5 minutes
(longer for flow rates below 1.0 mL/min) before beginning an analysis. The
delay allows the digital signal processor (DSP) program to stabilize the flow
rate.
•
In the %A, %B, %C, and %D columns, enter a decimal percentage value from
0.1% through 100% for the eluent composition. The pump cannot run unless
the combined total of all four eluents equals 100%.
•
In the V column, select the injection valve position (L for load or I for inject).
•
In the FLOW column, enter a flow rate from 0.5 to 5.0 mL/min. The flow rate
is adjustable in increments of 0.01 mL/min.
NOTE The GS50 is optimized for operation at 1.5 mL/min or
less.
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3-9
GS50 Gradient Pump
•
To have the pump deliver a linear or curved gradient (see Section 2.8.3), enter
a curve number in the C column.
NOTE The pump uses the curve number in a step when moving
to that step from the one preceding it. Because the INIT
and TIME=0.0 steps are not preceded by other steps,
curve numbers cannot be entered for them.
•
If a step field is “blank” (has no entry), the last selected value for the field
remains in effect.
•
The ∨ symbol next to the bottom time entry indicates that it is followed by at
least one more step. Move the cursor to the entry and press the down arrow to
see the additional step(s).
•
The ^ symbol next to the top time entry indicates that it is preceded by at least
one more step. Move the cursor to the entry and press the up arrow to see the
additional step(s).
•
The > symbol at the end of a line on the METHOD screen indicates a lateral
extension to the line. Move the cursor to the end of the line and press the right
arrow to display the METHOD events screen.
3.3.1
Creating a New Method
New methods can be created when the method clock is in either Hold or
Run.
1. Go to the MAIN or DETAIL screen.
2. Check that the pump is set to LOCAL. If it is not, move the cursor to
the field, press Select ∆ or Select ∇ to toggle the mode to REMOTE,
and press Enter or a cursor arrow button.
3. Go to the METHOD screen.
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3 • Operation and Maintenance
4. In the EDIT field, enter either the number of the method to be created
(if you plan to edit an unused method) or the number of an existing
method (if you plan to modify this method and save the changes to a
new method number). After entering an unused method number, the
screen resembles the example in Figure 3-5.
METHOD EDIT 5
TIME %A
INIT 100.0
0.00
Help prompt
%B
SAVE TO 5
0 - 5000 PSI
LIMITS
%C
%D
C V
- L
>
>
>
>
Figure 3-5. Method Screen: Creating a New Method
5. In the LIMITS field, set the low and high pressure limits (see
Section 3.1.5).
6. Each method begins with two timed steps (see Figure 3-5): an initial
conditions step (containing INIT in the TIME column) and a time zero
step (containing 0.00 in the TIME column). Enter parameters for both
steps.
7. Enter a new step, using one of these methods:
Doc. 031612-03 10/03
•
Move the cursor to the TIME field below the last step in the
method and enter the elapsed time at which to start the new step.
Press Enter or a cursor arrow button.
•
Move the cursor to any TIME field on the screen and press Insert
to add a new step after the cursor position. Enter the elapsed time
at which to start the new step. When you press Enter or a cursor
arrow button, the GS50 Moduleware moves the new step to the
correct chronological position.
3-11
GS50 Gradient Pump
8. Continue entering parameters for the new step. When you finish,
move the cursor to the SAVE TO field and do one of the following:
3.3.2
•
After editing an unused method, press Enter.
•
After editing an existing method, enter a new number to save the
method to and press Enter.
Running a Method
1. If the pump motor is off, press Off/On to turn on the motor.
2. Check that the pump is set to LOCAL mode, METHOD control:
Go to the MAIN or DETAIL screen. If REMOTE or DIRECT CNTRL is
selected, move the cursor to the field, press Select ∆ or Select ∇ to
toggle the value, and press Enter or a cursor arrow button.
3. In the METHOD field, enter the number of the method to run. If the
method clock is already running, the method starts immediately. If the
clock is in Hold, press Hold/Run to start the method.
4. The elapsed time on the method clock when the method begins
determines where (that is, at which step and parameters) the method
begins running:
3-12
•
If the method clock is at INIT or time zero, the method begins
running using the INITial condition parameters.
•
If the method clock is greater than zero, the method begins
running using the parameters specified in the step for that elapsed
time. If you prefer to start the method at the INITial condition,
press Reset.
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3 • Operation and Maintenance
3.3.3
Editing a Method
Existing methods can be modified by changing, adding, or deleting steps
and parameters. Changes can be made while the method clock is stopped
or running.
NOTE After saving changes, there is no way to recall the
original method. If you plan to make experimental
changes to a method but also need to retain the original
method, save the modified method to a new number.
This is the basic procedure for editing a method:
1. Go to the METHOD screen. In the EDIT field, enter the number of the
method to be modified.
2. Make the required changes:
•
To change a parameter, position the cursor in the field and enter
the new parameter.
•
To add a method step, move the cursor to any TIME field and press
Insert, or move the cursor to the TIME field below the last step
and enter the elapsed time at which to start the new step. When
you press Enter or a cursor arrow button, the Moduleware
automatically moves the new step to the correct chronological
position. Continue entering parameters for the new step.
•
To delete a method step, move the cursor to the TIME field of the
step and press Delete twice.
3. When you finish editing, move the cursor to the SAVE TO field. Press
Enter to save the changes to the current method number, or enter a
new method number and press Enter.
If the modified method is currently running, the changes are
immediately incorporated in the run and executed at the programmed
time, unless the modified event has already been executed. If this is
the case, press Reset to restart the method at the INITial conditions
and run the updated version of the method.
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3-13
GS50 Gradient Pump
3.3.4
Deleting a Method
To delete an entire method, move the cursor to the TIME field of the INIT
step on the METHOD screen and press Delete twice.
3.3.5
Changing the Running Method
To change from the method currently running to a different method, go to
the MAIN or DETAIL screen, enter the new method number in the METHOD
field, and press Enter.
The new method begins running, using the parameters specified in the
step for the current elapsed time. If you prefer to start the method at the
INITial conditions, press Reset.
3.3.6
Controlling the Method Clock
The method clock is controlled by the Hold/Run button, the Reset
button, and the MIN fields on the MAIN and DETAIL screens.
•
To start and stop the method clock, press Hold/Run.
•
To reset the method clock to INIT, press Reset.
•
To set the clock to a specific elapsed time, either enter the time in the
MIN field on the MAIN screen or press a Select button to step through
the programmed step times; when the appropriate step time is
displayed, press Enter.
The method will start (or continue) running, using the method
parameters specified for that time.
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3 • Operation and Maintenance
3.4
Example Methods
The examples in this section provide step-by-step instructions for creating three
types of methods: isocratic, linear gradient, and curved gradient. The last example
demonstrates how to edit a running method.
Before entering any of the example methods, set the pump to Local mode, Method
control. Go to the MAIN or DETAIL screen and, if necessary, toggle from REMOTE
to LOCAL and from DIRECT CNTRL to METHOD.
3.4.1
Isocratic Method Example
Specify an isocratic mixture of 60% eluent A, 25% eluent B, and 15%
eluent C to be pumped at 1.0 mL/min. Figure 3-3 illustrates the isocratic
profile for this example. Figure 3-6 illustrates the METHOD screen as it
appears when the example is set up.
METHOD EDIT 1
TIME
INIT
0.00
%A
60.0
Help prompt
%B
25.0
SAVE TO 1
0 - 5000 PSI
LIMITS
%C
%D
C V
- L
>
15.0
>
>
>
Figure 3-6. Method Screen: Isocratic Run Example
1. Go to the METHOD screen and enter a method number (1, for
example) in the EDIT field. The screen automatically changes the
number in the SAVE TO field to the number of the method being
edited.
Doc. 031612-03 10/03
•
If Method 1 already exists and you want to retain it, enter a new
(unused) method number in the EDIT field.
•
If Method 1 already exists and you want to delete it, move the
cursor to TIME=INIT and press Delete twice.
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GS50 Gradient Pump
2. Move the cursor to the %A field and enter 60. Move to the %B field
and enter 25. Move to the %C field and press Enter (15 is
automatically filled in to make the eluent percentages equal 100).
Ignore the C (Curve) and V (Valve) fields. Move to the FLOW field
and enter a flow rate of 1.00.
3. Move the cursor to the SAVE TO field and press Enter to save the
method.
4. Go to the MAIN or DETAIL screen, enter the new method number in the
METHOD field (1, in this case), and press Enter. If the pump motor is
off, press Off/On to have the pump start delivering the eluent mixture.
5. If the method clock is in hold, press Hold/Run to begin running the
method.
3.4.2
Linear Gradient Method Example
Here is a summary of the linear gradient method steps:
•
Create Method 2 to begin under isocratic conditions with 100%
eluent A at 1.0 mL/min.
•
Hold this for 5 minutes (TIME = 5.00).
•
Begin a 10-minute segment in which the amount of eluent B is
increased and the amount of eluent A is decreased until the mixture is
20% eluent A and 80% eluent B (TIME = 15.00).
•
Hold this for 5 minutes (TIME = 20.00).
•
At 20.10 minutes, return to 100% eluent A and re-equilibrate the
system for the next analysis.
Figure 3-7 illustrates the gradient profile for this method.
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3 • Operation and Maintenance
Figure 3-7. Linear Gradient Method Profile
1. Go to the METHOD screen and enter a method number (2, for
example) in the EDIT field.
•
If Method 2 currently exists and you want to retain it, enter a new
(unused) method number in the EDIT field.
•
If Method 2 currently exists and you want to delete it, move the
cursor to TIME = INIT and press Delete twice.
2. Move to the FLOW field of the INIT step and enter a flow rate of 1.00.
3. Move the cursor to the %A field of the TIME = 0 step and press Enter.
100% of eluent A is automatically filled in.
4. Move the cursor to the line below TIME = 0 and enter 5 to store a step
at TIME = 5.00 minutes. Next, move the cursor to %A and press Enter
to enter 100% and define a step with the same eluent composition as
the previous step. Although there is no change in eluent parameters,
100% of %A must be entered at 5.00 minutes to establish 5.00 as the
gradient start point.
This marks the end of the isocratic section of the run and the
beginning of the eluent B concentration ramp. From this point on, the
concentration of eluent A decreases from 100% as the concentration
of eluent B increases from 0%.
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3-17
GS50 Gradient Pump
5. Move the cursor to the next line. Enter 15 in the TIME field. Move the
cursor to the %A field and enter 20; enter 80 in the %B field.
After a total of 15 minutes (5 minutes of isocratic conditions plus
10 minutes to gradually decrease the amount of eluent A in the
mixture while increasing the amount of eluent B), the eluent
composition is 20% eluent A and 80% eluent B. Figure 3-8 illustrates
the METHOD screen as it appears after Step 5.
METHOD EDIT 2
TIME %A
INIT 100.0
0.00 100.0
5.00 100.0
15.00 20.0
Help prompt
%B
80.0
SAVE TO 2
LIMITS
0 - 5000 PSI
%C
%D
C V
- L
>
>
>
>
Figure 3-8. Linear Gradient Method Example (After Step 5)
6. Move the cursor to the next line. Enter 20 in the TIME field. Move the
cursor to the %A field and enter 20; enter 80 in the %B field.
The eluent composition remains unchanged at 20% eluent A and 80%
eluent B for 5 minutes.
7. Move the cursor to the next line. Enter 20.10 in the TIME field. Move
the cursor to the %A field and enter 100.
8. Move the cursor to the SAVE TO field and press Enter to save the
method to memory. Figure 3-9 illustrates the completed method.
METHOD EDIT 2
TIME %A
^
5.00 100.0
15.00 20.0
20.00 20.0
20.10 100.0
Help prompt
%B
80.0
80.0
SAVE TO 2
0 - 5000 PSI
LIMITS
%C
%D
C V
- L
>
>
>
>
Figure 3-9. Linear Gradient Method (Completed)
3-18
Doc. 031612-03 10/03
3 • Operation and Maintenance
9. Press MENU and Enter to go to the MAIN screen. Enter 2 in the
METHOD field. Press Reset to reset the method to the INIT step, if
necessary.
10. If the pump motor is off, press Off/On to start the pump.
11. If the method clock is in hold, press Hold/Run to start the method
running. When the method reaches the last step in the method
(TIME=20.10), the pump continues to pump isocratically until the
clock is reset.
3.4.3
Curved Gradient Method Example
Here is a summary of the curved gradient method example steps:
•
Create Method 3 to begin under isocratic conditions with 100%
eluent A at 1.5 mL/min.
•
Hold this for 3 minutes (TIME = 3.00).
•
Begin a 10-minute convex segment in which the amount of eluent B
is increased and the amount of eluent A is decreased until the mixture
is 100% eluent B (TIME = 13.00).
•
Hold this for 2 minutes (TIME = 15.00).
Figure 3-10 illustrates the gradient profile for this method.
Eluent B
100
% Eluent
50
Eluent A
0
5
10
15
20
25
Time (min)
Figure 3-10. Gradient Curve Profile
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3-19
GS50 Gradient Pump
1. Go to the METHOD screen and enter a method number (3, for
example) in the EDIT field.
•
If Method 3 currently exists and you want to retain it, enter a new
(unused) method number in the EDIT field.
•
If Method 3 currently exists and you want to delete it, move the
cursor to TIME = INIT and press Delete twice.
2. Move to the FLOW field of the INIT step and enter a flow rate of 1.50.
3. Move the cursor to the %A field of the TIME = 0 step and press Enter.
100% of eluent A is automatically filled in.
4. Move the cursor down to the next line and enter 3 in the TIME field.
Move to the %A field and press Enter. 100% of eluent A is
automatically filled in.
5. Move the cursor to the C field and enter 5 to run gradient curve 5.
Figure 3-11 illustrates the METHOD screen as it appears so far.
METHOD EDIT 3
TIME %A
INIT 100.0
0.00 100.0
3.00 100.0
Help prompt
%B
SAVE TO 3
0 - 5000 PSI
LIMITS
%C
%D
C V
- L
>
>
>
C
>
Figure 3-11. Curved Gradient Method Example (After Step 5)
6. Move the cursor down to the next line and enter 13 in the TIME field.
Move the cursor to %A and enter 0. Move the cursor to %B and enter
100.
7. Move the cursor to the C field and enter 2 to run gradient curve 2.
This marks the end of the isocratic section of the run and the
beginning of the eluent B concentration ramp. After a total of
13 minutes (3 minutes of isocratic conditions plus 10 minutes to
gradually decrease the amount of eluent A in the mixture while
increasing the amount of eluent B), the eluent composition is 0%
eluent A and 100% eluent B.
3-20
Doc. 031612-03 10/03
3 • Operation and Maintenance
8. Move the cursor to the next line and enter 15 in the TIME field. Move
the cursor to %B and enter 100.
9. Move the cursor to the C field and enter 2 to run gradient curve 2. The
eluent composition remains unchanged at 100% eluent B for
2 minutes. Figure 3-12 illustrates the completed METHOD screen.
METHOD EDIT 3
%B
TIME %A
^
0.00 100.0
3.00 100.0
100.0
13.00
15.00 3.00 100.0
Help prompt
SAVE TO 3
0 - 5000 PSI
LIMITS
%C
%D
C V
- L
>
>
5
>
2
>
2
Figure 3-12. Curved Gradient Method Example (Complete)
10. Move the cursor to the SAVE TO field and press Enter to save the
method to memory.
3.4.4
Editing a Running Method Example
After entering a method, you can change, add, and delete steps and
parameters. If the method being edited is currently running, the changes
are executed when you move the cursor to the SAVE TO field and press
Enter (unless the modified event has already been executed).
This example describes how to make the following changes to Method 2,
the linear gradient example (see Section 3.4.2):
•
Change the eluent composition at TIME = 15.00 from 20% eluent A
and 80% eluent B to 20% eluent A, 60% eluent B, and 20% eluent C.
•
Add a step at TIME = 17.00 to make the eluent composition 40% eluent
B and 60% eluent C.
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3-21
GS50 Gradient Pump
Figure 3-13 illustrates the METHOD screen as it appears when editing is
complete.
METHOD EDIT 2
TIME %A
^
5.00 100.0
15.00 20.0
17.00 20.0
^
20.0
20.00 3.00
Help prompt
%B
60.0
40.0
80.0
SAVE TO 2
0 - 5000 PSI
LIMITS
%C
%D
C V
- L
>
>
20.0
>
60.0
>
Figure 3-13. Edited Linear Gradient Method Example
This example assumes that Method 2, the example, is currently running.
1. Go to the METHOD screen and enter 2 in the EDIT field.
2. Move the cursor to the TIME = 15.00 step of Method 2. Move the
cursor to %A and enter 20; enter 60 for %B; and then enter 20 for %C.
3. Move the cursor to the TIME field and press Insert. Enter 17 in the
time field. Move the cursor to %B and enter 40; enter 60 in the %C
field.
4. Move the cursor to the SAVE TO field and press Enter.
5. Press Menu and select either the MAIN screen or DETAIL screen.
Check the status of the method clock on the screen.
3-22
•
If the elapsed time is less than 15 minutes (the time for the first
change made to the method), the changes will be incorporated
into this run and executed at the programmed time.
•
If the elapsed time is greater than 15 minutes, the changes will
not be incorporated into this run. If it is necessary to put the
changes into effect immediately, press Reset (to set the method
clock to the INITial conditions) or enter an elapsed time of less
than 15 (10, for example) in the MIN field.
Doc. 031612-03 10/03
3 • Operation and Maintenance
3.5
Routine Maintenance
This section describes routine maintenance procedures that the user can perform.
All other maintenance procedures must be performed by qualified Dionex
personnel.
As Needed
•
Refill the eluent reservoir.
•
Make fresh eluent.
•
Refill the bottle of flush solution for the piston seal wash assembly.
Daily
•
If you are using a combination of eluents that contains both salt or base and
solvent, wash the pump pistons frequently. The GS50 piston seal wash
assembly continuously rinses the back of the piston seals to remove salt
crystals and prolong the life of the seals. To use this feature, an external water
source must be connected; see Section B.2.6 for more information.
Also, do not store the pump with salt buffers in the flow path. Flush the entire
flow path (excluding the column) with deionized water to prevent salt crystals
from causing clogs.
•
Check the entire mechanical chassis for leaks from the eluent proportioning
valve assembly, valve connections, eluent reservoirs, and vacuum degas
chamber (if the vacuum degas assembly is installed). Tighten or replace any
leaking fittings. Wipe up liquid spills and rinse dried reagents off pump
components with deionized water.
•
Clean eluent reservoirs thoroughly (inside and out) with deionized water and
let them air dry. If a reservoir still appears dirty, or if there is a slimy film on
the interior, follow the cleaning procedure in the Pressurizable Reservoir
Installation Instructions.
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3-23
GS50 Gradient Pump
Weekly
•
Check the junctions between the pump heads and the pump casting for
evidence of liquid leaks. If the piston seal wash tubing is not connected, check
the drain tubes at the rear of the pump heads for evidence of moisture. Normal
friction and wear may gradually result in small liquid leaks around the piston
seal. If unchecked, these leaks can gradually contaminate the piston housing,
causing the pump to operate poorly. If leaks occur, replace the piston seals
(see Section 5.2).
•
Check the end-line filters and change if needed. When new, end-line filters are
pure white. If the system is in continuous operation, change the filters weekly,
or whenever they become discolored. Replace the filters more often if you
notice bacterial buildup or if the mobile phase does not contain solvent.
NOTE It is especially important to regularly replace end-line
filters when using aqueous eluents, which may
contaminate the filter with bacteria or algae. Although
the contamination may not be visible, it can cause flow
restrictions to the pump.
Every Six Months
•
Replace the main piston seals (see Section 5.2).
•
Replace the piston rinse seals and O-rings (see Section 5.2).
Yearly
3-24
•
Replace the backup seals (see Section 5.2).
•
Inspect the check valves annually; replace as needed (see Section 5.1).
•
Inspect the pistons annually; replace as needed (see Section 5.3).
Doc. 031612-03 10/03
3 • Operation and Maintenance
3.6
Shutdown
•
Rinse the pump pistons before and after daily operation to prevent buildup of
salt crystals or other contaminants that can damage the piston seal. Never
store the pump with salt buffers in the flow path.
•
Before shutting down the GS50 for 3 days or more, flush the system with
deionized water to prevent contaminants from building up. If this is not
possible, maintain a continuous rinse through the system until normal
operation is resumed. In addition, set the flow rate to 0.05 mL/min and set all
four eluent percentages to 25% to ensure that the proportioning valve
assembly is flushed.
Flushing the proportioning valves is extremely important if the eluents
combine salt or base and solvent. If salt precipitates in the valves, it
can seriously damage the valve diaphragms. If this happens, the
entire proportioning valve assembly must be replaced (see
Section 5.5).
•
Before shutting down the GS50 for more than 3 days, reduce the pressure on
the eluent reservoirs to about 21 kPa (3 psi).
•
Before shutting down the GS50 for 4 weeks or more, Dionex recommends
thoroughly flushing any chemicals out of the vacuum degas assembly tubing
(if installed) with deionized water. This helps prevent crystallization in the
membrane pores.
•
Shut down the GS50 by turning off the main power switch.
Doc. 031612-03 10/03
3-25
GS50 Gradient Pump
3-26
Doc. 031612-03 10/03
4 • Troubleshooting
This chapter is a guide to troubleshooting minor problems that may occur during
operation of the GS50 Gradient Pump. First, turn to the section of this chapter that
best describes the operating problem. There, possible causes of the problem are
listed in order of probability.
When necessary, you will be referred to other product manuals for additional
information. These manuals are usually located on the Dionex Reference Library
CD-ROM (P/N 053891).
If you are unable to resolve a problem, contact Dionex Technical Support. In the
U.S., call 1-800-346-6390. Outside the U.S., call the nearest Dionex office.
4.1
Pressure Fluctuations Between Pump Heads
The GS50 display updates the pressure readout once per second. Excessive
pressure variation (more than 3% difference from one pressure reading to
the next) or a low pressure reading indicates a problem.
•
Pump out of prime; there is no eluent
1. Refill the eluent reservoirs. Make sure that each eluent line extends to the
bottom of the reservoir.
2. Reprime the pump (see Section B.2.7).
•
Pump out of prime; eluents are improperly degassed
1. If the GS50 contains a vacuum degas assembly, test the degas pump:
a. Go to the DEGAS PUMP CALIBRATION AND STATUS screen (see
Section C.3.3).
b. Press a Select button to toggle the RDY field to CAL and press Enter.
c. The degas pump should turn on and run for about 2 minutes; if it does
not, see Section 4.6.
2. If the GS50 does not contain a vacuum degas assembly, degas eluents
manually (see Section 3.1.1) and reprime the pump (see Section B.2.7).
Doc. 031612-03 10/03
4-1
GS50 Gradient Pump
•
Eluents insufficiently degassed
If the GS50 contains a vacuum degas assembly, the degas pump automatically
turns on periodically. Go to the DEGAS OPTIONS screen (see Section C.1.6)
and increase the frequency. For example, run the degas pump for 30 seconds
at 2-minute intervals.
If eluents are manually degassed, degas them for longer periods of time.
•
Pump out of prime; end-line filter is dirty or clogged
1. When new, end-line filters (P/N 045987) are pure white. If the system is
in continuous operation, replace the end-line filters weekly, or whenever a
filter becomes discolored. Replace filters more often if bacterial buildup
is visible or if the mobile phase does not contain solvent. See the
Pressurizable Reservoir Installation Instructions for more information
about end-line filters.
NOTE It is especially important to regularly replace end-line
filters when using aqueous eluents, which may
contaminate the filter with bacteria or algae. The
bacterial buildup may not be visible.
2. Reprime the pump (see Section B.2.7).
•
Pump out of prime; blockages in inlet tubing
Kinked or clogged tubing causes the pump to be “starved” for eluent. Replace
the tubing and fittings, and then reprime the pump (see Section B.2.7).
•
If priming does not eliminate excessive pressure fluctuations, check
valves may be dirty or defective
Replace the check valves (see Section 5.1). Also, install an end-line filter
(P/N 045987) on each eluent line (see Section 3.1.2); impurities in the eluent
can cause dirty or defective check valves.
•
If priming does not eliminate excessive pressure fluctuations, piston seals
may be dirty or defective
Replace the piston seals (see Section 5.2).
•
If priming does not eliminate excessive pressure fluctuations, piston may
be scratched or broken
Replace the piston (see Section 5.2) and the piston seal (see Section 5.3).
4-2
Doc. 031612-03 10/03
4 • Troubleshooting
4.2
Pump Does Not Start
•
Flow rate is set to zero
Reset the flow rate (see Section 2.4.1).
•
While being primed, pump starts briefly and an alarm sounds
1. The high pressure limit was tripped and the following message is
displayed:
High Pressure Limit Violation
Check that the waste valve on the secondary pump head is opened (see
Figure 2-6). To open the waste valve, turn the knob one-quarter to onehalf turn counterclockwise.
2. The low pressure limit was tripped and the following message is
displayed:
Low Pressure Limit Violation
a. Verify that the low pressure limit setting is several hundred psi
below the operating pressure (see Section 3.1.5).
b. Make sure there are no liquid leaks in the flow system.
c. Make sure both the priming valve and waste valve are closed (see
Figure 2-6). To close a valve, turn the knob clockwise.
Doc. 031612-03 10/03
4-3
GS50 Gradient Pump
4.3
Pump Stops
•
Method or other remote input instructed the pump to stop
If no error message is displayed, the pump was probably instructed to stop by
the method, computer, or other remote signal source. If you do not want the
pump to stop, take the appropriate action: edit the method, etc.
•
Low pressure limit was tripped; the following message is displayed:
Low Pressure Limit Violation
1. Verify that the low pressure limit setting is several hundred psi below the
operating pressure (see Section 3.1.5).
2. Make sure there are no liquid leaks in the flow system.
3. Verify that eluent is present in the selected channel. If the eluent reservoir
is empty, refill it or select a channel which does have eluent. Prime the
pump before resuming operation (see Section B.2.7).
4. Make sure both the priming valve and the waste valve are closed (see
Figure 2-6). To close a valve, turn the knob clockwise.
5. Place the pump in LOCAL mode, DIRECT CONTROL (see Section 2.8).
Press Off/On to start the pump. Verify that the pistons are moving and that
pump operation is audible.
If there is no sound from the pump, check the LED on the CPU/LAN card
in the GS50 electronics chassis (see Figure 2-5). A green LED indicates
normal operation; a red LED indicates a power fault. When a power fault
occurs, the GS50 enters a diagnostic state and inhibits all other controls
until the fault is corrected. If the LED is red, turn off the power for a few
seconds and then turn it back on.
4-4
Doc. 031612-03 10/03
4 • Troubleshooting
•
High pressure limit was tripped; the following message is displayed:
High Pressure Limit Violation
1. The high pressure limit setting may be too low. As columns age, their
backpressure increases and it may be necessary to compensate for this by
increasing the high pressure limit. If the column is the source of the high
backpressure, clean the column as instructed in the column manual. If this
does not eliminate the problem, replace the column.
2. Observe a run to see whether the high pressure limit is triggered when
injection occurs; if it is, the injection valve may be causing a blockage.
This indicates that the rotor seal or stator may need replacement. Refer to
the operator’s manual for the chromatography module for instructions.
3. Make sure that no tubing is plugged or overtightened. To determine the
source of the high backpressure, isolate segments of the flow path:
a. Remove the pump outlet tubing at the injection valve.
b. Press Off/On to turn on the pump. Set the flow rate to 1.0 mL/min
and record the backpressure.
c. One at a time, reconnect each component of the flow path. If
reconnecting a component causes a sharp increase in
backpressure, replace the component. Replace as many
components as necessary to resume operation at the standard
operating backpressure.
4. Verify that the pressure transducer offset reading is correct:
a. Open the waste valve on the secondary pump head (see
Section 2.5) by turning the knob one-quarter to one-half turn
counterclockwise.
b. Check the pressure reading; if it is above 97 kPa (14 psi),
recalibrate the pressure transducer offset (see Section C.3.5).
Doc. 031612-03 10/03
4-5
GS50 Gradient Pump
•
A DSP-related error message is displayed:
Several error messages report problems related to the digital signal processor
(DSP) program: DSP communication fails, DSP does not acknowledge, etc.
When one of these messages is displayed, follow the procedure below.
1. Turn off the GS50 by pressing the main power switch.
2. Verify that the DSP card is correctly installed in slot 1 of the GS50
electronics chassis (see Figure 2-5).
3. Turn on the GS50 power.
4. If the DSP error message reappears, contact Dionex for assistance. One of
these parts may need to be replaced: the power supply (P/N 046440), the
DSP card, or the CPU/LAN card.
Do not remove any of the electronics cards from the pump. The
components on the cards cannot be serviced by the user. If servicing
is required, it must be performed by qualified personnel and
appropriate electrostatic discharge (ESD) handling procedures must
be followed.
Ne retirez aucune des cartes électroniques de la pompe. Aucun des
composants sur les cartes ne peut être réparé par l'utilisateur. Toute
réparation doit être effectuée par un personnel qualifié utilisant des
procédures correctes de décharge électrostatique.
Halten Sie sich von der Elektronik des GS50 fern. Die Elektronik kann
nicht vom Anwender gewartet werden. Falls ein Service erforderlich
ist, ist dieser von qualifiziertem Personal durchzuführen. Dabei
müssen die geeigneten Verfahren zur elektrostatischen Entladung
(ESD) eingehalten werden.
4-6
Doc. 031612-03 10/03
4 • Troubleshooting
•
The following error message is displayed:
Encoder index not found
1. Turn off the GS50 by pressing the main power switch.
2. Verify that the cables connected to the DSP card in slot 1 of the GS50
electronics chassis are fully seated (see Figure 2-5).
3. Turn on the GS50 again. If the encoder index error message reappears,
contact Dionex for assistance.
•
Electrical cables improperly installed
1. Place the pump in LOCAL mode, DIRECT CONTROL (see Section 2.8).
Press Off/On to start the pump.
2. If a non-zero flow rate is displayed and the keypad LED is on, verify that
the electrical cables in the mechanical chassis are properly installed.
a. Turn off the GS50 power by pressing the power switch.
b. Using a 7-mm open-end wrench (or your fingers), loosen the lock on
the mechanical chassis drawer. The lock is on the lower right side of
the chassis, between valves 3 and 4 (see the label on the inside of the
lower door).
c. Pull out the mechanical chassis drawer a few inches.
d. Locate the distribution card on the top of the mechanical chassis.
Check that all electrical cables are seated correctly in their connectors
on the card. The cables are identified by printed labels on the card.
e. Push the mechanical chassis drawer back in place, being careful not
to pinch the cables. Tighten the drawer lock.
f.
Doc. 031612-03 10/03
Turn on the power.
4-7
GS50 Gradient Pump
4.4
Liquid Leaks/Leak Alarm
•
Defective piston seal
1. Replace the piston seal (see Section 5.2).
2. Check all connections between the eluent reservoirs and the pump heads.
Tighten the fitting connections just enough to stop the leak.
•
Leaking check valves
Replace the check valves (see Section 5.1).
•
Proportioning valve leaks
Tighten loose fittings. If there are no loose fittings, replace the valve (see
Section 5.5).
Overtightening the fitting connections may strip the threads in the
proportioning valve block. If this happens, the entire proportioning
valve assembly must be replaced (see Section 5.5).
•
Waste valve knob leaks
Replace the O-ring (P/N 055752). See Section 5.4 for instructions.
•
Excessive system backpressure
If the system backpressure is substantially higher than the normal operating
backpressure for the currently configured system (including the column),
tubing may be plugged or overtightened. Follow the procedure below to
isolate segments of the flow path and determine the source(s) of the high
backpressure.
1. Remove the pump outlet tubing at the injection valve.
2. Press Off/On to turn on the pump. Set the flow rate to 1.0 mL/min and
record the backpressure.
3. One at a time, reconnect each component (tubing, fittings, etc.) of the
flow path. If reconnecting a component causes a sharp increase in
backpressure, replace the component. Replace as many components as
necessary to resume operation at the standard operating backpressure.
4-8
Doc. 031612-03 10/03
4 • Troubleshooting
4.5
Noisy Pump Motor
•
Excessive pressure or worn motor
As the pump motor ages, it typically becomes noisier and a slapping or
clanking sound (which becomes louder as pressure increases) is audible.
However, if the motor noise suddenly becomes much louder, contact Dionex
Technical Support for assistance.
•
DSP card current limit has been exceeded
Turn on the GS50 by pressing the main power switch. Check the DSP (digital
signal processing) card in slot 1 of the GS50 electronics chassis (see
Figure 2-5). Note the three small LEDs in the upper left corner of the DSP
card bulkhead; if the bottom LED is flashing in time with the pump strokes,
the current limiter is being activated. (The built-in current limiter protects the
motor and motor drive.)
As the pump motor ages, it is normal for the current limit to be activated more
frequently. However, if the current limit is being activated even at low flow
rates and/or low pressures, contact Dionex Technical Support for assistance.
4.6
Vacuum Degas Assembly Does Not Run
•
Vacuum degas assembly is not installed
Go to the PUMP OPTIONS screen (see Section C.1.8) and verify that the
DEGAS PUMP OPTION field is set to YES. If the field is set to NO, the vacuum
degas assembly is not installed.
•
DEGAS OPTIONS
screen settings incorrect
Go to the DEGAS OPTIONS screen (see Section C.1.6). If the DEGAS PUMP
field is set to ALWAYS OFF, select BY SETTING and then enter the cycle
duration and frequency times.
•
Electrical cables improperly installed
Follow the steps below to manually test the vacuum degas assembly.
1. Go to the DEGAS PUMP CALIBRATION AND STATUS screen (see
Section C.3.3). Press a Select button to toggle the RDY field to CAL and
press Enter.
Doc. 031612-03 10/03
4-9
GS50 Gradient Pump
2. The pump should turn on and run for the cycle duration time specified on
the DEGAS OPTIONS screen (see Section C.1.6). If it does not, verify that
the cables connected to the pump in the GS50 electronics chassis (see
Figure 2-5) and mechanical chassis are connected correctly.
a. Turn off the GS50 power by pressing the power switch.
b. Using a 7-mm open-end wrench (or your fingers), loosen the lock on
the mechanical chassis drawer. The lock is on the lower right side of
the chassis, between valves 3 and 4 (see the label on the inside of the
lower door).
c. Pull out the mechanical chassis drawer a few inches.
d. Locate the distribution card on top of the mechanical chassis. Check
that all electrical cables are seated correctly in their connectors on the
card. The cables are identified by printed labels on the card.
If the connections are correct, either the distribution card or the
vacuum degas assembly may need to be replaced. Contact Dionex
Technical Support for assistance.
e. Push the mechanical chassis drawer back in place, being careful not
to pinch the cables. Tighten the drawer lock.
f.
4-10
Turn on the power.
Doc. 031612-03 10/03
4 • Troubleshooting
4.7
Vacuum Degas Assembly Calibration Fails
At the end of the degas calibration, the DEGAS READING value is less than
13000 counts and one of the following error messages appears:
Vacuum degas pump is not present or degas
circuitry is malfunctioning.
Vacuum Degas Fails
Follow the procedure below to verify that the cable to the vacuum degas
assembly is connected to the distribution card.
1. Turn off the GS50 power by pressing the power switch.
2. Using a 7-mm open-end wrench (or your fingers), loosen the lock on the
mechanical chassis drawer. The lock is on the lower right side of the
chassis, between valves 3 and 4 (see the label on the inside of the lower
door).
3. Pull out the mechanical chassis drawer a few inches.
4. The distribution card is on the top of the mechanical chassis. Locate the
vacuum degas assembly connector (labeled VAC PUMP) near the right rear
corner of the card. Make sure the cable is fully seated in the connector.
5. Push the mechanical chassis drawer back in place, being careful not to
pinch any of the cables. Tighten the drawer lock.
6. Turn on the power.
7. Go to the DEGAS PUMP CALIBRATION AND STATUS screen and retry the
calibration (see Section C.3.3). If the message appear again, the degas
assembly may need to be replaced. Contact Dionex Technical Support for
assistance.
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4-11
GS50 Gradient Pump
4.8
Vacuum Degas Assembly Low Vacuum
The GS50 monitors the vacuum degas reading at 1-minute intervals. If the
vacuum degas is less than the monitoring value, the degas pump turns on. If
the vacuum reading is 2000 counts or more less than the monitoring value
when the degas pump turns off, the following message appears:
LOW VACUUM ALARM!!
Check DEGAS OPTIONS settings or refer to
service manual
Go to the DEGAS OPTIONS screen (see Section C.1.6). Increase the CYCLE
DURATION time and/or decrease the TIME BETWEEN CYCLES. If this does not
resolve the problem, the vacuum degas assembly may need to be replaced.
Contact Dionex Technical Support for assistance.
4.9
Relays or TTLs Inoperative
•
Incorrectly installed cables
Make sure the cables between the appropriate relay function and the input or
output unit are connected to the correct slots (see Appendix D).
•
TTL input-related error
1. The cables may be installed incorrectly. Verify that ground wires are
connected to ground (-) pins and signal wires are connected to signal (+)
pins. For complete installation instructions, see Section D.3.
2. The TTL input mode selected on the TIME FUNCTION IN screen (see
Section C.1.9) must match the signal type output by the device connected
to the GS50. Check the user’s manual for the device to verify that the
correct signal type is selected.
3. A programming error occurred in the device sending the signal. Refer to
the user’s manual for the device for troubleshooting assistance.
•
TTT/Relay output-related error
1. The cables may be installed incorrectly. Verify that ground wires are
connected to ground (-) pins and signal wires are connected to signal (+)
pins. For complete installation instructions, see Section D.3.
4-12
Doc. 031612-03 10/03
4 • Troubleshooting
2. A programming error occurred in the device sending the signal. Refer to
the user’s manual for the device for troubleshooting assistance.
3. The device being triggered may require a TTL input, not a relay. Connect
the device to a GS50 TTL output (see Appendix D).
4.10 TTL2 Output Inoperative
•
When attempting to set TTL2, the following message appears:
TTL2 is set to indicate FLOW/NO FLOW.
The TTL2 OUTPUT USAGE field on the PUMP OPTIONS screen is currently set
to signal when pump flow stops (0 FLOW). This setting can be used to control
the power to a Self-Regenerating Suppressor (SRS). To use TTL2 for another
function, set the TTL2 OUTPUT USAGE field to NORMAL (see Section C.1.8).
4.11 Poor Chromatographic Reproducibility
•
Liquid leaks
1. Check for leaks from the piston seals. Replace the piston seal on any head
with a leak (see Section 5.2).
2. Check for leaks throughout the remainder of the system, including the
check valves, injection valve, and columns. Tighten or replace fittings as
needed.
•
Pump not primed
Prime the pump (see Section B.2.7).
•
Liquid lines incompletely flushed after an eluent change
Before beginning operation, attach a syringe to the priming valve (see
Figure B-4) and draw at least 2.5 mL of the new eluent (20 mL if the vacuum
degas assembly is installed) through the liquid lines.
•
Malfunctioning proportioning valve
Replace the proportioning valve assembly (see Section 5.5).
Doc. 031612-03 10/03
4-13
GS50 Gradient Pump
•
Malfunctioning check valves
Clean and/or replace the check valves (see Section 5.1).
•
Insufficient mixing
1. Some mobile phases are difficult to mix. If you notice shifting retention
times or an unstable baseline, install an additional mixer (see
Section 2.4.3).
2. The gradient mixer may be dirty or contaminated. Install a new mixer (see
Section 2.4.3).
•
Contaminated mobile phase
1. Clean all eluent reservoirs thoroughly (inside and out) with deionized
water and let them air dry. If a reservoir still seems dirty, or if there is a
slimy film on the interior, following the cleaning procedure in the
Pressurizable Reservoir Installation Instructions.
2. Replace all end-line filters (P/N 045987) (see Section 3.1.2).
3. Prepare new stock solution.
4. Prepare fresh mobile phase. To ensure their purity, prepare all mobile
phases with spectro-grade solvents, reagent-grade chemicals, and ASTM
Type I (or better) filtered and deionized water.
•
Problem unrelated to the pump
1. The mobile phase was prepared at the wrong concentration or prepared
with impure chemicals/solvents or water. To ensure their purity, prepare
all mobile phases with spectro-grade solvents, reagent-grade chemicals,
and ASTM Type I (or better) filtered and deionized water.
2. The column may be the source of the problem. Refer to the column
manual for troubleshooting assistance.
3. The injection valve may be the source of the problem. Refer to the
chromatography module operator’s manual for troubleshooting
assistance.
4-14
Doc. 031612-03 10/03
4 • Troubleshooting
4.12 Noisy Baseline
•
Eluents not filtered
Install an end-line filter (P/N 045987) on the end of each eluent line, inside
the reservoir. Verify that the end of each filter extends to the bottom of the
reservoir and that each filter is submerged in eluent. For more details, see
Section 3.1.2.
•
Pump not properly primed
Prime the pump (see Section B.2.7).
•
Pressure ripple needs to be calibrated
Go to the CALIBRATION MENU, select the PRESSURE RIPPLE CALIBRATION
screen, and run the pressure ripple calibration sequence (see Section 3.1.6).
•
Piston seal is damaged
If the piston seal is damaged, it allows liquid leaks. Leaks are usually visible,
and thus are easily detected. If there is leakage in any of the locations
described below, the piston seal is damaged and should be replaced (see
Section 5.2).
If the piston seal wash assembly is in use: Leaks are not visible when the
piston seal wash assembly is in use.
If the piston seal wash assembly is not in use (for example, because the flush
bottle is empty): Check for leaks near the drain tube on the bottom of each
pump head.
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4-15
GS50 Gradient Pump
4-16
Doc. 031612-03 10/03
5 • Service
This chapter describes GS50 Gradient Pump service and repair procedures that the
user can perform. All procedures not included here, including electronics-related
repair procedures, must be performed by Dionex personnel. For assistance,
contact Dionex Technical Support. In the U.S., call 1-800-346-6390. Outside the
U.S., call the nearest Dionex office.
Before replacing any part, refer to the troubleshooting information in Section 4 to
isolate the cause of the problem.
Substituting non-Dionex parts may impair GS50 performance, thereby
voiding the product warranty. Refer to the warranty statement in the
Dionex Terms and Conditions for more information.
5.1
Cleaning and Replacing the Check Valves
A dirty check valve causes erratic flow rates and pressures; it may also cause
the pump to lose prime and/or be difficult to reprime.
1. Turn off the main power switch, to ensure that you do not unintentionally start
the GS50.
2. Disconnect the tube fittings from the inlet and outlet check valve housings on
the primary pump head (see Figure 5-1).
3. Use a 1/2-inch wrench to loosen both check valve housings. Remove the
check valve housings and cartridges from the pump head. Carefully remove
the check valve cartridges from the housings.
4. Place the check valve housings and cartridges in a beaker with methanol.
Sonicate or agitate the parts for several minutes.
5. Rinse each check valve housing and cartridge thoroughly with filtered
deionized water.
Doc. 031612-03 10/03
5-1
GS50 Gradient Pump
Outlet Check Valve
Gradient Mixer
Drain
Tube
To Injection Valve
Spacer
Primary
Pump Head
IN
OUT
To Pressure Transducer
Secondary
Pump Head
Acorn Nut
(2 per pump head)
Proportioning
Valve
Inlet
Check
Valve
Waste Valve
Pressure
Transducer
To Proportioning Valve
From Proportioning Valve
To Waste
Figure 5-1. Pump Heads and Liquid Lines
6. The inlet check valve assembly housing has a 1/4-28 port. Replace the
cartridge in the inlet check valve housing, making sure the double-hole end of
the cartridge is visible.
The outlet check valve assembly housing has a 10-32 port. Replace the
cartridge in the outlet check valve housing, making sure the single-hole end of
the cartridge is visible. Liquid flows through the check valve in the large
single hole and out the small double holes.
NOTE The pump will not operate properly unless the cartridge
is installed in the housing in the correct orientation.
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Doc. 031612-03 10/03
5 • Service
7. Reinstall the check valves. Be sure to install the inlet check valve on the
bottom of the primary pump head and the outlet check valve on the top of the
head. Tighten the check valves fingertight, and then use a wrench to tighten an
additional one-quarter to one-half turn. Tighten a little more only if the valve
leaks.
Overtightening may damage the pump head and check valve housing
and crush the check valve seats.
8. Reconnect the liquid lines. Turn on the GS50 main power.
9. Prime the pump (see Section B.2.7).
If you cannot prime the pump and all other possible causes of the problem
have been eliminated, replace the check valve (inlet check valve assembly,
P/N 047660; outlet check valve assembly, P/N 047657).
After replacing the check valve assembly, go to the USAGE LOG screen (see
Section C.2.4). Move the cursor to the VALVES IN USE field and press Enter to
reset the field to 0 cycles.
Doc. 031612-03 10/03
5-3
GS50 Gradient Pump
5.2
Replacing a Piston Seal and Piston Rinse Seal
A damaged piston seal allows leakage past the piston, as well as leakage from
the seal wash housing. The pump may be difficult to prime, flow rates may be
unstable, and there may be baseline noise.
Removing the Head and Piston
1. Turn off the main power switch, to ensure that you do not unintentionally start
the GS50.
2. Disconnect all tubing connections to the pump head.
3. Remove the two acorn nuts and washers from the pump head (see Figure 5-1).
4. Carefully disengage the head from the piston by pulling the head straight off,
and away from, the studs.
Lateral motion while disengaging the pump head from the piston may
break the piston.
Un mouvement latéral pendant la séparation de la tête et du piston
peut casser le piston.
Vermeiden Sie Seitwärtsbewegungen, wenn Sie den Kopf vom Kolben
lösen. Andernfalls kann der Kolben brechen.
5. Place the head (front end down) on a clean work surface and lift off the spacer
to expose the piston seal (see Figure 5-2 or Figure 5-3).
6. The piston does not come off as part of the pump head assembly because it is
captured by a magnetic retention system. After removing the pump head, hold
the shaft of the piston (near the base), tilt the piston slightly, and pull the
piston away from the pump.
5-4
Doc. 031612-03 10/03
5 • Service
Priming Valve Knob
(P/N 055709)
Outlet Check
Valve Assembly
(P/N 047657)
O-Ring
(P/N 055752)
Piston Seal
(P/N 055870)
Spacer with Drain
(P/N 057913)
Primary Pump Head
(P/N 055711)
Piston Rinse Seal
(P/N 048722)
O-Ring
(P/N 014895)
O-Ring
(P/N 059283)
Piston
(P/N 052840)
Inlet Check
Valve Assembly
(P/N 047660)
Seal Wash
Housing Guide
(P/N 058032)
Figure 5-2. Primary Pump Head
Waste Valve Knob
(P/N 055710)
O-Ring
(P/N 055752)
Piston Seal
(P/N 055870)
Secondary
Pump Head
(P/N 055712)
Spacer with Drain
(P/N 057913)
Piston Rinse Seal
(P/N 048722)
Seal Wash
Housing Guide
(P/N 058032)
O-Ring
(P/N 014895)
O-Ring
(P/N 059283)
Piston
(P/N 052840)
Figure 5-3. Secondary Pump Head
Doc. 031612-03 10/03
5-5
GS50 Gradient Pump
Installing the New Piston Rinse Seal
1. Remove the seal wash guide from the spacer to expose the piston rinse seal
and O-ring. Remove the O-ring.
2. Remove the old piston rinse seal from the guide as follows:
a. Hold the guide with the flat side facing up.
b. To dislodge the piston rinse seal, gently insert the shaft of the piston
through the small hole in the center of the guide (see photo below).
c. Pull the seal off the end of the piston shaft and remove the piston from the
guide.
3. Hold the new piston rinse seal (P/N 048722) with the grooved side facing up.
4. Using your fingertip, gently press the piston rinse seal into the guide until the
edge of the seal is below the surface of the guide.
The piston rinse seal is made of soft plastic. Do not press on the seal
with anything hard or sharp, including your fingernail. If the seal is
nicked or gouged, it will not seal properly and may result in leaks.
5. Place the new O-ring (P/N 059283) into the groove in the guide.
6. Remove the O-ring from the groove in the flat side of the spacer and replace it
with the new O-ring (P/N 014895).
7. In one hand, hold the guide with the O-ring and piston rinse seal facing up
(this prevents the O-ring from falling out). In the other hand, hold the spacer
with the cavity facing down.
8. Gently press the guide into the cavity in the spacer until it is fully seated.
5-6
Doc. 031612-03 10/03
5 • Service
Removing the Piston Seal from the Head
1. Fill the head cavity with deionized water by injecting the liquid through either
the piston opening or the inlet check valve.
2. Reinsert the piston approximately 1/8 inch into the seal.
3. If this is the primary pump head, install a 10-32 fitting plug (P/N 042772) on
the outlet check valve. Tighten the plug.
If this is the secondary pump head, install a 10-32 fitting plug (P/N 042772)
in both the inlet and outlet ports. Tighten the plugs.
4. Push the piston into the head. (This should hydraulically unseat the seal from
the head.) Remove the piston and pull off the seal.
NOTE If the piston seal is not removed, make sure the 10-32
fitting plug(s) are tight and add more water. Make sure
the head contains no air bubbles, and then repeat Steps
2 and 4.
5. Remove the 10-32 fitting plug(s).
Installing the New Piston Seal
1. Open the priming valve knob (primary pump head) or waste valve knob
(secondary pump head) by turning the knob one-quarter to one-half turn
counterclockwise.
2. Push the piston through the spacer and then through the new seal. Insert the
piston and seal into the pump head until the seal makes contact with the
bottom of the counterbore. Remove the piston.
NOTE If necessary, lubricate the seal with a small amount of
isopropyl alcohol to facilitate insertion.
3. To seat the seal, push down on the spacer until it is flush with the head. A
clicking sound indicates that the seal is correctly seated.
4. Close the priming valve knob or waste valve knob.
Doc. 031612-03 10/03
5-7
GS50 Gradient Pump
Reinstalling the Head and Piston
Dionex recommends reinstalling the head and piston as a single assembly, so that
the piston centers itself onto the magnetic follower.
1. Hold the assembled spacer and stud with the drain tubes aligned vertically and
press the spacer into the head until it is flush with the indented surface of the
head.
2. Insert the piston so that 1/4 inch of the shaft is exposed. This ensures that the
magnet in the follower picks up the piston. (The follower is the rod that holds
the piston in place as it moves in and out of the pump head assembly.)
3. Reinstall the head and piston. Place the washers and acorn nuts on the studs,
and use a wrench to tighten the acorn nuts evenly (12 in-lb torque).
Completing the Procedure
1. Reconnect all liquid lines to the pump head.
2. Turn on the main power switch.
3. Open the eluent valve.
4. Prime the pump (see Section B.2.7).
5-8
Doc. 031612-03 10/03
5 • Service
5.3
Pump Piston Replacement
Continued leaking of the piston seal after installation of a new seal (assuming
the pump head is tight) indicates a dirty or scratched pump head and/or a
broken piston.
1. Turn off the main power switch, to ensure that you do not unintentionally start
the GS50.
2. Disconnect the tube fittings to the pump head with the defective piston (see
Figure 5-1).
3. Remove the two acorn nuts and washers from the pump head (see Figure 5-1).
4. Slowly pull the head and allow it to separate from the housing. Carefully
disengage the head from the piston by pulling the head straight off, and away
from, the studs.
Lateral motion while disengaging the pump head from the piston may
break the piston.
Un mouvement latéral pendant la séparation de la tête et du piston
peut casser le piston.
Vermeiden Sie Seitwärtsbewegungen, wenn Sie den Kopf vom Kolben
lösen. Andernfalls kann der Kolben brechen.
NOTE The piston is not removed with the rest of the pump
head assembly because it is captured by a magnetic
retention system.
5. After removing the pump head, hold the shaft of the piston (near the base), tilt
the piston slightly, and pull the piston away from the pump.
6. Replace the piston (P/N 052840) and piston seal (P/N 055870).
Doc. 031612-03 10/03
5-9
GS50 Gradient Pump
7. Dionex recommends reinstalling the head and piston as a single assembly, so
that the piston centers itself.
a. Check that the piston rinse seal and O-ring are seated in the seal
wash housing guide. Press the seal wash housing guide into the
head until it is flush with the indented surface of the head.
b. Insert the piston into the head so that one-quarter inch of the shaft
is exposed. This ensures that the magnet in the follower picks up
the piston. (The follower is the rod that holds the piston in place
as it moves in and out of the pump head assembly.)
c. Reinstall the head and piston. Place the washers and acorn nuts
on the studs, and use a wrench to tighten the acorn nuts evenly
(12 in-lb torque).
8. Reconnect the tube fittings to the pump head.
9. Turn on the main power switch.
10. Prime the pump (see Section B.2.7).
5-10
Doc. 031612-03 10/03
5 • Service
5.4
Waste Valve or Priming Valve O-Ring Replacement
A damaged O-ring causes leakage around the base of the waste valve or
priming valve knob.
1. Turn off the main power switch, to ensure that you do not unintentionally start
the GS50.
2. To remove the waste valve or priming valve from the pump head (see
Figure 5-1), turn the appropriate knob counterclockwise until it is loose, and
then pull the knob straight out of the cavity in the pump head.
3. If the O-ring is removed with the valve knob in Step 2, pull the O-ring off the
end of the knob (see Figure 5-4).
If the O-ring is not removed with the valve knob, insert a thin object without
sharp surfaces into the cavity in the pump head and carefully pull out the Oring. Do not scratch the cavity.
Scratches in the cavity will cause leaks around the base of the knob
while the pump is being primed.
4. Slide a new O-ring (P/N 055752) over the end of the valve.
5. To reinstall the valve containing the new O-ring, turn the knob clockwise and
then tighten fingertight.
NOTE It is normal to encounter resistance after several
rotations of the knob because the O-ring is being pushed
into the cavity of the pump head.
Valve Knob
O-Ring
(P/N 055752)
Figure 5-4. Waste Valve or Priming Valve O-Ring Replacement
Doc. 031612-03 10/03
5-11
GS50 Gradient Pump
5.5
Proportioning Valve Assembly Replacement
A defective eluent proportioning valve can cause the following problems:
leaks, nonreproducible eluent compositions (which may cause retention time
shifts), and flow restrictions (which may cause high backpressure).
1. Turn off the main power switch, to ensure that you do not unintentionally start
the GS50.
2. If the eluent reservoirs are pressurized, turn off the pressure and allow the
reservoirs to vent.
3. Follow these steps to disconnect the electrical connector for the proportioning
valve assembly from the distribution card.
a. Using a Phillips screwdriver, remove the screw that secures the
mechanical chassis drawer to the enclosure. The screw is on the
lower left side of the chassis, below the secondary pump head
(see the label on the inside of the lower door).
b. Pull out the mechanical chassis drawer a few inches.
c. The distribution card is located on the top of the mechanical
chassis. Locate the electrical connector labeled VALVES at the
front of the card. Disconnect the connector from the card.
4. Disconnect the liquid line from the outlet of the proportioning valve assembly
(see Figure 5-5).
5. Loosen the screws securing the proportioning valve assembly to the bulkhead.
Pull the valve assembly forward and disconnect the eluent lines on the inlet.
Remove the valve assembly from the bulkhead.
6. Thread the bundle of electrical lines from the new valve assembly
(P/N 046203) through the bulkhead and up to the distribution card. Connect
the valve electrical connector to the VALVES connector on the distribution
card.
5-12
Doc. 031612-03 10/03
5 • Service
Gradient
Mixer
1
4
Proportioning Valve
Assembly Outlet
2
3
Figure 5-5. Eluent Proportioning Valve Assembly
7. Connect the eluent lines to the new valve assembly. Make sure eluent lines A
through D are in the appropriate valve ports. Connect eluent line A to the port
marked #1, eluent B to the port marked #2, and so on.
Tighten liquid connections to the proportioning valves no more than
fingertight plus one-quarter turn. Overtightening or crossthreading
the valve fittings may strip the threads in the block.
8. Align the new valve assembly as shown in Figure 5-5 and mount it to the
bulkhead. Tighten the screws.
9. Push the mechanical chassis drawer back in place. Make sure the cables are
not pinched and then reinstall the drawer lock screw.
10. Attach the liquid line from the inlet of the primary pump head (see
Figure 5-1).
11. Prime the pump (see Section B.2.7).
Doc. 031612-03 10/03
5-13
GS50 Gradient Pump
5.6
Changing Main Power Fuses
1. Turn off the main power switch.
HIGH VOLTAGE—Disconnect the main power cord from its source and
also from the rear panel of the GS50.
HAUTE TENSION—Débranchez le cordon d'alimentation principal de
sa source et du panneau arrière du GS50.
HOCHSPANNUNG—Ziehen Sie das Netzkabel aus der Steckdose und
der Netzbuchse auf der Rückseite des GS50.
2. The fuse holder is part of the main power receptacle on the GS50 rear panel
(see Figure 5-6). Note the recessed lock located on each side of the fuse
holder.
Using a small screwdriver, push each lock toward the center to release it.
When both locks are released and the fuse holder pops out slightly, pull the
fuse holder straight out of its compartment.
3. Replace the two fuses in the holder with new IEC 127 fast-blow fuses rated
3.15 amps (P/N 054745). Dionex recommends always replacing both fuses at
the same time.
Fuse Holder
Fuses (2)
Locking
Spring
Locking
Spring
Key
Insert
screwdriver
and twist to
release
(each side)
Fuse Holder
(Side View)
Main Power
Receptacle
Figure 5-6. Main Power Fuse Holder
5-14
Doc. 031612-03 10/03
5 • Service
4. Reinsert the fuse holder into its compartment. Apply enough pressure evenly
against the holder to engage the two locks; when both locks are engaged, the
holder is flush against the panel.
5. Reconnect the main power cord and turn on the power.
5.7
Changing the GS50 Delay Volume (Optional)
The GS50 is plumbed at the factory to ensure a low delay volume (<400 µL).
Section 5.7 explains how to modify the GS50 plumbing to obtain the standard
delay volume of <800 µL. Increasing the delay volume will improve mixing noise
at flow rates of 1.0 mL/min and above.
The replumbing procedure requires two simple changes:
•
Replacement of the tubing assembly installed between the eluent
proportioning valve and the primary pump head.
•
Replacement of the gradient mixer.
The standard delay volume conversion kit (P/N 056968) contains all the parts
required for this procedure.
Standard Delay Volume Conversion Kit
Part Number
Item
Quantity
055878
Tubing Assembly, 0.8-mm (0.030-in) ID
1
043275
10-32 Fitting Bolt
2
043276
Ferrule Fitting
2
054044
GM-5 Gradient Mixer
1
055860
Component Clip, 3/4 inch
1
045796
Screw, M3 x 8
1
045691
Washer
1
Doc. 031612-03 10/03
5-15
GS50 Gradient Pump
Conversion procedure
1. Turn off the main power switch, to ensure that you do not unintentionally start
the GS50.
2. Using a Phillips screwdriver, remove the screw that secures the mechanical
chassis drawer to the enclosure. The screw is on the lower left side of the
chassis, below the secondary pump head (see the label on the inside of the
lower door). Pull out the drawer approximately 15 cm (6 in).
3. Remove the tubing assembly installed between the proportioning valve and
the primary pump head (see Figure 5-7).
a. Disconnect the tubing connected to the inlet check valve housing.
b. Push the tubing through the small opening in the bulkhead near
port 2 of the proportioning valve.
c. Disconnect the tubing connected to the proportioning valve outlet
and push the tubing through the small opening in the bulkhead
near port 3 of the proportioning valve.
d. Remove the tubing assembly from the drawer and set it aside.
Replace with new
component clip (P/N 055860)
Replace with new
GM-5 Gradient Mixer
(P/N 054044)
IN
OUT
1
4
Proportioning
Valve
Inlet
Check
Valve
2
3
Pre-swage before
connecting to valve
Replace with new tubing
assembly (P/N 055878)
Figure 5-7. Replumbing the GS50 to Change the Delay Volume
5-16
Doc. 031612-03 10/03
5 • Service
4. Install the new tubing assembly:
a. Locate the tubing assembly, as well as the two 1/4-28 fittings
(P/N 052230) and two ferrule fittings (P/N 052231) included in
the package with the tubing.
b. From the rear of the bulkhead, insert one end of the new tubing
assembly through the opening near port 2 and feed the tubing
through the opening.
c. Install a 1/4-28 fitting and a ferrule fitting on this end of the
tubing. Connect the tubing to the inlet check valve housing.
d. From the rear of the bulkhead, insert the other end of the tubing
assembly through the opening near port 3 and feed the tubing
through the opening.
e. Install a 1/4-28 fitting and a ferrule fitting on this end of the
tubing. Insert the tubing into the drain port on the secondary
pump head and tighten to pre-swage (i.e., compress) the ferrule.
(This will improve the connection to the proportioning valve.)
f.
Remove the tubing from the drain port, connect it to the
proportioning valve outlet, and tighten fingertight.
5. Disconnect the inlet and outlet lines from the gradient mixer currently
installed in the pump. Set the mixer aside.
6. Remove the hardware (component clip, washer, and screw) that secured the
gradient mixer to the bulkhead.
7. Install the new component clip, washer, and screw.
8. Remove the plug from each end of the new gradient mixer and install the
mixer in the clip. Connect the inlet and outlet lines to the mixer.
9. Push the mechanical chassis drawer back in place, making sure the cables are
not pinched. Reinstall the drawer lock screw.
10. Prime the pump (see Section B.2.7).
NOTE Store the tubing assembly, gradient mixer, and mounting
hardware removed from the GS50 in a safe place. If it is
ever necessary to return the pump to the low delay
volume, these parts must be reinstalled.
Doc. 031612-03 10/03
5-17
GS50 Gradient Pump
5-18
Doc. 031612-03 10/03
A • Specifications
A.1
Physical
Dimensions
Weight
Decibel Level
A.2
Operating
Humidity
A.4
19 kg (42 lb)
60 db (“A WEIGHTING” setting)
Environmental
Operating
Temperature
A.3
33.5 cm high x 22.5 cm wide x 42 cm deep
(13.1 in x 8.9 in x 16.8 in)
6 cm (2.5 in) clearance required behind the module
10 to 50 °C (50 to 104 °F)
5% to 95% relative humidity (noncondensing)
Electrical
Main Power
Requirements
100 to 240 Vac, 50/60 Hz; 2.5 amps. No manual adjustment is
required; the GS50 power supply is main voltage auto-sensing.
Fuse
Requirements
Two 3.15 amp fast-blow IEC 127 fuses (P/N 954745)
Display and Keypad
Doc. 031612-03 10/03
Display
Liquid crystal with adjustable backlighting.
Keypad
26-button pad for entering commands and numeric values for
screen parameters.
A-1
GS50 Gradient Pump
A.5
Hydraulics
Eluent
Selection
Pump
Settable Flow
Range
Proportioning Type
Compositional
Range
Gradient Linearity
Dual-piston (in series), variable speed, 100 µL per revolution
0.0 mL/min, or from 0.05 to 5.0 mL/min in increments of
0.01 mL/min. Note: The GS50 is optimized for operation at
1.5 mL/min or less.
Low pressure
0% to 100% in 0.1% increments
Four concave, four convex, one linear
Flow Accuracy
<1% of set value or ± 2 µL/min, whichever is greater
Flow Precision
<0.2%
Compositional
Accuracy
<± 1%
Operating
Pressure
35 MPa (5000 psi), maximum
High Pressure
Limit
691 kPa to 35 MPa (100 to 5000 psi) in increments of 0.1 MPa
(14 psi); trips instantaneously
Low Pressure
Limit
0 to 34 MPa (0 to 4900 psi) in increments of 0.1 MPa (14 psi); a
start-up delay prevents false tripping
Delay Volume
Low delay volume: <400 µL
Standard delay volume: <800 µL
Pressure Ripple
A-2
Four different eluent components; each eluent can be
proportioned from 0% to 100%
<1% at 13.8 MPa (2000 psi) and 1.0 mL/min
Doc. 031612-03 10/03
A • Specifications
A.6
Control Modes
Remote
Local (Front Panel)
A.7
Limited remote operation via TTL-input logic level and TTLoutput and Relay contact closures or full remote programming
and control via the Dionex DX-LAN interface.
Methods: Stores up to 100 separate methods (00 through 99); the
actual number depends on available memory. Each method can
contain up to 50 separate steps.
Storage: Nonvolatile memory protects against the loss of
programs when the pump is turned off or if there is a power
failure.
Vacuum Degas Assembly (Optional)
Channels
Pump
Materials
Doc. 031612-03 10/03
4-channel degas chamber (with degas membranes)
Dual-stage diaphragm vacuum pump
Wetted materials, PEEK, PTFE
A-3
GS50 Gradient Pump
A-4
Doc. 031612-03 10/03
B • Installation
B.1
Facility Requirements
•
Make sure the GS50 installation site meets the electrical and environmental
specifications in Appendix A.
•
Install the GS50 on a sturdy workbench at a height that ensures convenient
viewing of the front panel display.
Lift the GS50 only from the bottom or side surfaces of the module.
Lifting by the front doors will damage the door hinges. Use caution
when lifting the module: it weighs 19 kg (42 lb).
Ne soulevez le GS50 que par le fond ou les côtés. Son soulèvement
par la porte du panneau avant endommagera les charnières de la
porte. Soyez prudent lorsque vous soulevez le GS50: il pèse 19 kg.
Wenn Sie den GS50 anheben oder bewegen möchten, greifen Sie bitte
unter den Boden oder heben Sie das Gerät an den Seiten an. Heben
Sie das Gerät nicht an der Vordertür an. Dadurch können die
Türangeln beschädigt werden. Seien Sie vorsichtig, wenn Sie den
GS50 anheben. Das Gerät wiegt 19 kg.
•
Allow at least 6 cm (2.5 in) of free space behind the GS50 for connections and
ventilation.
•
House eluents at least 20 cm (8 in) above the GS50 in an EO1 Eluent
Organizer (P/N 044125) or in built-in eluent containment (for example, the
reservoir container of the LC25 Chromatography Oven).
Doc. 031612-03 10/03
B-1
GS50 Gradient Pump
B.2
Installation Instructions
NOTE The GS50 Ship Kit (P/N 061222) contains several items
needed to install the pump. Locate the Ship Kit before
beginning the installation.
B.2.1
Power Connection
SHOCK HAZARD—To avoid electrical shock, use a grounded
receptacle. Do not operate the GS50 or connect it to AC power mains
without an earthed ground connection.
The power supply cord is used as the main disconnect device. Make
sure the socket-outlet is located near the GS50 and is easily
accessible.
Operation at AC input levels outside of the specified operating voltage
range may damage the GS50.
DANGER D'ÉLECTROCUTION—Pour éviter toute électrocution, il faut
utiliser une prise de courant avec prise de terre. Ne l'utilisez pas et ne
le branchez pas au secteur C.A. sans utiliser de branchement mis à la
terre.
Le cordon d'alimentation principal est utilisé comme dispositif
principal de débranchement. Veillez à ce que la prise de base soit
située/installée près du module et facilement accessible.
STROMSCHLAGGEFAHR—Zur
Vermeidung
von
elektrischen
Schlägen ist eine geerdete Steckdose zu verwenden. Das Gerät darf
nicht ohne Erdung betrieben bzw. an Wechselstrom angeschlossen
werden.
Das Netzkabel ist das wichtigste Mittel zur Stromunterbrechung.
Stellen Sie sicher, daß sich die Steckdose nahe am Gerät befindet und
leicht zugänglich ist.
B-2
Doc. 031612-03 10/03
B • Installation
The GS50 power supply is auto-sensing; thus, no adjustment is required
to select the line voltage. There are two ways to control power to the
GS50:
•
On/off control from the GS50
To implement: Connect a modular power cord (IEC 320 C13) from
the GS50 main power receptacle (see Figure B-1) to a grounded,
single-phase power source. Use the GS50 power switch actuator to
turn the pump on and off.
•
Control from the LC30 Chromatography Oven
To implement: Locate one of the IEC jumper cables (P/N 960748)
provided in the LC30 Ship Kit. Connect the jumper cable from the
GS50 main power receptacle (see Figure B-1) to an IEC auxiliary
receptacle on the LC30 rear panel. Leave the GS50 power switch on
continuously and use the LC30 main power switch to turn the pump
on and off.
DX-LAN
Connector
DX-LAN
SAFETY WARNING
AND
SERIAL NUMBER
LABEL
Upper Chase
(TTL & Relay
Lines)
Fuse Holder
Main Power
Receptacle
Lower Chase
(Eluent and
Waste Lines)
Figure B-1. GS50 Rear Panel Connections
Doc. 031612-03 10/03
B-3
GS50 Gradient Pump
B.2.2
Electronics Chassis Connections
Connections to the GS50 electronics chassis vary, depending on which
Dionex chromatography module is being connected to the pump. For
instructions, refer to the appropriate section below.
LC30 Connections
1. Route the RJ-11 serial cable from the rear of the LC30
Chromatography Oven through the GS50 upper chase (see
Figure B-1). Connect the cable to the LC COMM connector in slot 1 of
the GS50 electronics chassis (see Figure B-2).
2. Route the solenoid valve cable from the rear of the LC30 through the
GS50 upper chase. Connect the cable to the LC AIR connector in slot 1
(see Figure B-2).
NOTE Do not connect the LC30 to the LC LEAK
connector in slot 1; the oven contains internal
leak control electronics.
LC25 Connections
Route the electronics injection valve cable from the rear of the LC25
Chromatography Oven through the GS50 upper chase (see Figure B-1).
Connect the cable to the LC AIR connector in slot 1 of the GS50
electronics chassis (see Figure B-2).
NOTE Do not connect the LC25 to the LC LEAK connector
in slot 1; the oven contains internal leak control
electronics.
B-4
Doc. 031612-03 10/03
B • Installation
SLOT 1
GS50/IS25-DSP
PWR SPY
130W
Connect the leak
sensor cable from
the LC10 or LC20
here
Connect the serial
interface cable from
the LC30 here
Connect the
solenoid valve cable
from the LC10,
LC20, LC25, or LC30
here
L
C
L
C
L
C
L
E
A
K
C
O
M
M
A
I
R
P4
P3
P2
SLOT 2
BLANK
SLOT 3
BLANK
D
I
S
T
1
3
P
I
N
P6
D
I
S
T
DIST
MOTOR
1
2
P5
P
I
N
PRES
P8
SLOT 5
SLOT 4
TTL/RELAY CPU/LAN
P7
RLY-1
OUT
RLY-2
OUT
+
+
+
+
+
+
-
TTL-1
OUT
TTL-2
OUT
TTL-1
IN
TTL-2
IN
F
R
O
N
T
P
A
N
E
L
TTL-3
IN
TTL-4
IN
POWER SUPPLY
GREEN - OK
RED - FAULT
Figure B-2. GS50 Electronics Chassis
(Located behind pump upper door)
LC10 or LC20 Connections
1. Route the leak sensor cable from the rear of the LC10
Chromatography Organizer or LC20 Chromatography Enclosure
through the GS50 upper chase (see Figure B-1). Connect the cable to
the LC LEAK connector in slot 1 of the GS50 electronics chassis (see
Figure B-2).
2. Route the solenoid valve cable from the rear of the LC10 or LC20
through the GS50 upper chase. Connect the cable to the LC AIR
connector in slot 1 (see Figure B-2).
NOTE Refer to Appendix E for TTL and Relay
installation instructions.
Doc. 031612-03 10/03
B-5
GS50 Gradient Pump
B.2.3
DX-LAN Interface (Optional)
The DX-LAN interface enables the GS50 to communicate with a host
computer running either Chromeleon or PeakNet 6 software. The
interface also includes the CPU/LAN card (see Figure B-2) installed in
the GS50 at the factory.
1. Install the “combo” 10BASE-T Ethernet hub (P/N 057398) on a
workbench or on the wall. For installation instructions and site
requirements, refer to the installation guide shipped with the hub.
2. Plug the 10BASE-T DX-LAN cable (P/N 960281) into a 10BASE-T
port on the front panel of the hub.
The 10BASE-T DX-LAN cable is a Category 5 unshielded twisted-pair
cable. Do not substitute a cable of an inferior grade. Failure to use the
correct cable will cause the pump to lose communication with the
host computer.
3. Connect the other end of the cable into the 10BASE-T DX-LAN
connector on the GS50 rear panel (see Figure B-1).
4. Connect a 10BASE-T cable (P/N 960281) from a 10BASE-T port on
the hub to the 10BASE-T port on the host computer’s internal DXLAN card. If the connection is via port 8 on the hub, set the
Normal/Uplink push button to Normal.
NOTE For installation instructions for the internal DXLAN card, refer to Installing the Chromeleon IC
System (Document No. 031883) or Installing the
Dionex PeakNet 6 System (Document No. 031631).
When using 10BASE-T cabling, you must install a hub. If you simply
plug the 10BASE-T cable from the pump into the connector on the
host computer’s DX-LAN card, the connection will either not work or
will be unreliable.
Cascading Hubs
Cascading (connecting two or more hubs together via their 10BASE-T
ports) increases the number of ports or the number of users supported on
the network. For instructions on how to cascade hubs, refer to the
installation guide shipped with the hub.
B-6
Doc. 031612-03 10/03
B • Installation
B.2.4
Waste Lines
Two waste lines are installed at the factory and routed to the GS50 rear
panel.
•
One waste line exits the waste valve on the secondary pump head.
•
One waste line exits the leak drain.
A third waste line is installed at the user site when the piston seal wash
assembly is connected (see Section B.2.6).
Place the free ends of the waste lines into one waste container. To
maintain a positive siphon, position the waste container below the level of
the GS50.
NOTE For proper drainage, the leak drain line and seal
wash line should remain above the liquid level in the
waste container.
B.2.5
Eluent Line Connections
Eluent Inlet Line Connections
Eluent lines A through D are plumbed to the GS50 at the factory. To
complete the installation, attach the free end of each line to the
corresponding eluent reservoir.
Eluent Outlet Line Connections
Connect the tubing exiting the GM-4 Gradient Mixer to the injection
valve (see Figure 5-1).
NOTE Although the GS50 does not require pressurized
reservoirs, degassed eluents and pressurized
reservoirs are important when using eluents that are
manually degassed or eluents that are sensitive to
carbonate (NaOH) contamination. For a list of
Doc. 031612-03 10/03
B-7
GS50 Gradient Pump
pressurizable reservoirs available from Dionex, see
Section 2.6.
Do not use the 2-liter plastic reservoir (P/N 044129) for offline vacuum
degassing of eluents. The reservoir was not designed for this
purpose.
N'utilisez pas le réservoir en plastique de 2 litres (N/P 044129) pour le
dégazage à vide hors ligne d'éluants. Le réservoir n'a pas été conçu à
cette fin.
Verwenden Sie den 2-Liter Plastikbehälter (Bestell-Nr. 044129) nicht
zum Offline Vakkum-Entgasen von Eluenten. Der Behälter ist dafür
nicht ausgelegt.
B.2.6
Piston Seal Wash Connections (Optional)
The GS50 includes a piston seal wash assembly intended to continuously
rinse the back of the piston seals to remove salt crystals and prolong the
life of the seals. Follow the steps below to set up the seal wash function.
1. Fill a flush bottle with either deionized water or a combination of
deionized water and 10% or 20% isopropyl alcohol. (Isopropyl
alcohol will inhibit bacterial growth in the water.)
2. Place the flush bottle above the GS50. (During operation, gravity will
maintain flow through the pump heads.)
3. The flush solution is carried to the piston seal wash assembly and out
to waste via clear 1.5-mm (0.06-in) ID tubing (P/N 055847). Locate
this tubing in the GS50 Ship Kit and cut the tubing into three unequal
pieces in the following lengths:
B-8
•
117 cm (46 in)
•
152 cm (60 in)
•
15 cm (6 in)
Doc. 031612-03 10/03
B • Installation
4. Install the tubing as follows (see Figure B-3):
a. Push the 117-cm (46-in) piece of clear tubing onto the drain tube
on the bottom of the secondary pump head. Place the free end of
this tubing in the flush bottle. Make sure the end of the tubing is
near the bottom of the bottle.
b. Push the 152-cm (60-in) piece of clear tubing onto the drain tube
on the top of the primary pump head. This is the waste line. Route
this waste line through the lower tubing chase and out the back of
the GS50.
c. Push the 15-cm (6-in) piece of clear tubing over the drain tube on
the top of the secondary pump head. Push the other end of the
tubing over the drain tube on the bottom of the primary pump
head.
d. Place a 10 mL syringe (P/N 054578) at the end of the waste line,
press the syringe against the line to form a seal, and draw out all
of the air. This begins the siphoning action.
Figure B-3. Piston Seal Wash Flow Schematic
Doc. 031612-03 10/03
B-9
GS50 Gradient Pump
e. Push approximately 5 cm (2 in) of black 0.25-mm (0.01-in) ID
tubing (P/N 057057) into the end of the waste line.
NOTE The black tubing creates a flow restriction.
Assuming a height difference of about 76 cm
(30 in) between the flush bottle and the waste
container, this setup provides a flow of one drop
of flush solution every 5 to 30 seconds.
f.
Place the end of the waste line in a waste container.
NOTE For proper drainage, the waste line exit should
remain above the liquid level in the waste
container.
This completes the piston seal wash installation. Periodically refill the
flush bottle and empty the waste container as required.
B-10
Doc. 031612-03 10/03
B • Installation
B.2.7
Priming the Pump
Section B.2.7 describes three ways to prime the pump. The first two
procedures, Priming with a Syringe and Priming with the Prime Button,
are standard procedures. If these are ineffective, try the third procedure,
Priming with Isopropyl Alcohol.
Priming with a Syringe
NOTE Priming with a syringe is recommended after
changing eluents, or when eluent lines are empty.
1. Go to the MAIN screen (see Section C.1.2). Check that the operating
fields are set to LOCAL and DIRECT CNTRL.
If REMOTE or METHOD is currently selected, move the cursor to the
appropriate field, press Select ∆ or Select ∇ to toggle to the correct
setting, and press Enter or a cursor arrow button.
2. Move the cursor to the desired eluent. Enter 100 (to select 100% of
the eluent) and press Enter or a cursor arrow button.
3. Connect a 10 mL syringe (P/N 054578) to the luer port in the priming
valve on the primary pump head (see Figure B-4).
Secondary
Pump Head
Waste Valve
Primary
Pump Head
10 mL Syringe
(P/N 054578)
Priming
Valve
Port
Figure B-4. Priming the Pump
Doc. 031612-03 10/03
B-11
GS50 Gradient Pump
4. Open the waste valve on the secondary pump head (see Figure B-4)
by turning the knob one-quarter to one-half turn counterclockwise.
Opening the valve directs the eluent flow path to waste and eliminates
backpressure.
NOTE If the eluent is pressurized, liquid flows into the
syringe as soon as the priming valve is opened
in Step 5. Do not pressurize above 55 kPa
(8 psi).
5. Open the priming valve by turning it one-quarter to one-half turn
counterclockwise.
6. Press Off/On to turn on the pump motor.
7. If the eluent is not pressurized, loosen the cap on the eluent reservoir
or make sure there is a vent to the reservoir.
8. Draw the syringe back to begin pulling eluent through the flow path.
It may take several syringe draws to remove all air or previous eluents
from the tubing.
NOTE If the vacuum degas assembly is installed, draw
an additional 17 mL of eluent through the
pump head.
9. Return to Step 2. Select another eluent and repeat the priming
procedure.
10. After priming the manifold with each eluent, close the priming valve.
Do not overtighten.
11. Press Off/On to turn off the pump motor. The pump is now ready for
operation.
B-12
Doc. 031612-03 10/03
B • Installation
Priming with the Prime Button
1. Go to the MAIN screen (see Section C.1.2). Check that the operating
fields are set to LOCAL and DIRECT CNTRL.
If REMOTE or METHOD is currently selected, move the cursor to the
appropriate field, press Select ∆ or Select ∇ to toggle to the correct
setting, and press Enter or a cursor arrow button.
2. Set the eluent to 100% of the line to be primed. Press Enter or a
cursor arrow button.
3. Check that the priming valve on the primary pump head is closed (see
Figure B-4).
4. Open the waste valve on the secondary pump head (see Figure B-4)
by turning the knob one-quarter to one-half turn counterclockwise.
Opening the valve directs the eluent flow path to waste and eliminates
backpressure.
5. Press Prime on the GS50 front panel. The pump begins pumping at
approximately 2.5 mL/min.
NOTE The vacuum degas assembly contains 17 mL of
eluent. If the degas assembly is installed, prime
the GS50 for at least 7 minutes more than
usual; this ensures that all air and previous
eluent are purged from each channel (A, B, C,
and D) of the degas assembly.
6. Continue priming the GS50 until all air and previous eluents are
purged and no air bubbles can be seen exiting the waste line. If the
eluent manifold has not been primed, allow several extra minutes for
the eluent to pass through the pump.
7. Press Prime again to return to the flow rate selected for the analysis.
8. Close the waste valve. Do not overtighten. The pump is now ready
for operation.
Doc. 031612-03 10/03
B-13
GS50 Gradient Pump
Priming with Isopropyl Alcohol
NOTE Prime the pump heads with isopropyl alcohol only if
the two standard priming procedures (see previous
sections) are unsuccessful.
1. Connect a 10 mL syringe (P/N 054578) filled with isopropyl alcohol
(IPA) to the luer port in the primary pump head (see Figure B-4).
2. Open the waste valve on the secondary pump head (see Figure B-4)
by turning the knob one-quarter to one-half turn counterclockwise.
3. Press Off/On to turn on the pump motor.
4. Open the priming valve on the primary pump head (see Figure B-4)
by turning it one-quarter to one-half turn counterclockwise.
5. Use the syringe to slowly push alcohol through the pump. (If the
operating backpressure is high, this requires more force.)
NOTE Be careful not to push any air trapped in the syringe
through the pump. Check the waste line from the
secondary pump head to verify that there are no air
bubbles and that alcohol is traveling down the waste
line.
6. Close the priming valve. Do not overtighten. Disconnect the syringe
from the priming valve.
7. Let the pump run for several minutes, to purge alcohol from the pump
heads, and then press Prime and flush the heads with the desired
eluent.
Isopropyl alcohol may damage some columns. Be sure to thoroughly
rinse the alcohol from the pump before going on to Step 8.
8. Close the waste valve. Do not overtighten.
9. Select the flow rate required for the application.
10. Press Off/On to turn off the pump motor. The pump is now ready for
operation.
B-14
Doc. 031612-03 10/03
B • Installation
B.3
Automatic SRS Power Control (Optional)
TTL connections can be used to automatically switch off the power to a SelfRegenerating Suppressor (SRS) when the pump flow stops. In this setup, the
GS50 sends a TTL signal to the detector and then, after a 5-minute delay, the
detector shuts off the SRS power. The 5-minute delay allows momentary flow
interruptions without disturbing the SRS.
Follow the procedure below to implement automatic SRS power control.
1. Go to the GS50 PUMP OPTIONS screen and set TTL2 OUTPUT USAGE to
0 FLOW (see Figure B-5).
PUMP OPTIONS
TTL2 OUTPUT USAGE:
PRESSURE UNITS:
COMPRESSIBILITY:
DEGAS PUMP OPTION:
0 FLOW
PSI
xxxx
YES
Help prompt
Figure B-5. Pump Options Screen
2. Go to the detector TTL FUNCTION IN screen and assign TTL3 to SRS OFF/ON.
3. In the GS50 Ship Kit (P/N 061222), locate one pair of twisted black and red
wires (P/N 043598) and two green TTL connector plugs (P/N 921019).
4. Insert the twisted wires into the plugs: The signal wire (red) goes on the top of
each plug and the ground wire (black) goes on the bottom of each plug.
5. Plug one end of the cable into TTL2 OUT on the GS50. (The TTL connectors
are located behind the upper door.) Route the cable through the upper chase of
the GS50 and into the upper chase of the detector (see Figure B-6). Plug the
other end into TTL3 IN on the detector; be sure to maintain the wire orientation
described in Step 4.
Doc. 031612-03 10/03
B-15
GS50 Gradient Pump
Figure B-6. TTL Connections for SRS Power Control
(Detector and pump front views without front doors)
B-16
Doc. 031612-03 10/03
C • User Interface
This appendix describes and illustrates all of the screens that can be displayed on
the GS50 front panel. There are three types of screens: operational, diagnostic,
and calibration (see Figure C-1).
•
Operational screens allow the user to create, edit, and run methods that
control pump operation, as well as select default parameters.
•
Diagnostic screens allow the user to access diagnostic information and tests.
•
Calibration screens allow the user to calibrate pump functions (flow rate,
pressure offset, etc.).
MENU of
SCREENS
Operational Screens
1
2
MAIN
SCREEN
3
DETAIL
SCREEN
5
4
MODULE
SETUP
DEGAS
OPTIONS
METHOD
6
PUMP
OPTIONS
7
8
TIME
FUNCTION IN
DIAGNOSTIC
MENU
METHOD
EVENTS
Diagnostic Screens
1
2
3
4
POWER-UP
SCREEN
PRESSURE
STATISTICS
CALIBRATION
MENU
5
USAGE
LOG
DIAGNOSTIC
TESTS
Calibration Screens
1
LEAK CAL
& STATUS
2
DEGAS
CALIBRATION
3
4
5
FLOW
CALIBRATION
PRESSURE
OFFSET
CALIBRATION
PRESSURE
RIPPLE
CALIBRATION
Figure C-1. GS50 Menu Structure
Doc. 031612-03 10/03
C-1
GS50 Gradient Pump
C.1
Operational Screens
C.1.1
Menu of Screens
The MENU of SCREENS provides top-level access to the menu structure.
MENU of SCREENS
1 MAIN SCREEN
2 DETAIL SCREEN
3 METHOD
4 DEGAS OPTIONS
5 MODULE SETUP
6 PUMP OPTIONS
7 TIME FUNCTION IN
8 DIAGNOSTIC MENU
Help prompt
Figure C-2. Menu of Screens
NOTE You cannot select the DEGAS OPTIONS screen
unless the vacuum degas assembly (see Section 2.5)
is installed.
There are two ways to view a screen option:
•
Press the numeric button on the GS50 front panel keypad that
corresponds to the screen number on the menu. For example, press 3
to select and display the METHOD screen.
•
Move the cursor to the field containing the screen number and press
Enter.
To display a brief description of each screen, press Help.
C-2
Doc. 031612-03 10/03
C • User Interface
C.1.2
Main Screen
The MAIN screen is displayed automatically after the GS50 power is
turned on. Use the MAIN screen to:
•
Select basic operating parameters (in Direct control mode) or display
the status of basic operating parameters programmed on the METHOD
screen (in Method control mode).
•
Select the operating mode and control mode.
•
Select the method number to run.
100.0 %A
0.0 %B
0.0 %C
0.0 %D
Help prompt
LOAD
COLUMN A
LOCAL
2000 PSI
2.00 mL/MIN
10.27 MIN
METHOD 2
Figure C-3. Main Screen
%A–%D
Displays the percentage of each eluent (A, B, C, and
D) currently in use. The pump cannot run unless the
eluent percentages total 100%.
LOAD/INJECT
Selects the position of the injection valve: load or
inject.
COLUMN
Selects the active column (A or B) in the
chromatography module. Note that Column B is
available only when a column switching valve is
installed.
PSI
(MPa, BAR)
Displays the system backpressure in psi, MPa, or bar.
Select the unit of measure on the PUMP OPTIONS
screen (see Section C.1.8).
mL/MIN
Displays the eluent flow rate through the pump in
milliliters per minute.
Doc. 031612-03 10/03
C-3
GS50 Gradient Pump
MIN
Displays the total elapsed time that the method clock
has been running. When a new elapsed time is
entered, the method settings corresponding to the
new time take effect.
LOCAL/
REMOTE
Selects the operating mode:
METHOD #
C-4
•
Local mode is used when full control from the
GS50 front panel is needed.
•
Remote mode is used when Chromeleon or
PeakNet 6 is controlling the GS50. In this mode,
operation from the GS50 front panel is disabled.
There are two ways to clear Remote mode:
select the Disconnect command from the
software or turn off the pump power briefly and
then turn it on again.
In Method control, enter the method number to run in
this field.
Doc. 031612-03 10/03
C • User Interface
C.1.3
Detail Screen
Use the DETAIL screen to:
•
Display detailed information about the status of GS50 operating
parameters. This screen displays all the information shown on the
MAIN screen (see Section C.1.2), as well as some additional
parameters.
•
Set several parameters for Direct Control operation.
0
DETAIL SCREEN
1
100.0 %A
2125 PSI
0
0.0 %B
2.00 mL/MIN
1
0.0 %C
INJECT SAMPLE
0.0 %D
COLUMN A
0-5000 PSI
LIMITS
CURVE 5
REMOTE
METHOD 5
10.25 MIN
Help prompt
Figure C-4. Detail Screen
RLY1
RLY2
TTL1
TTL2
Provides Relay and TTL control of other devices. In
Direct control, select 1 (on) or 0 (off). In Method
control, program the Relay and TTL fields from the
METHOD screen (see Section C.1.4). See
Appendix D for a description of Relay and TTL
control.
CURVE
Indicates the gradient curve specified in the current
method step. See Section 2.8.3 for an explanation of
curve types.
LIMIT
Selects the low pressure and high pressure limits in
psi, MPa, or bar. See Section 3.1.5 for guidelines for
selecting pressure limits.
Doc. 031612-03 10/03
C-5
GS50 Gradient Pump
C.1.4
Method Screen
Use the METHOD screen to:
•
Enter the number of the method to create or edit.
•
Specify operating parameters for the method.
•
Enter the number the method is saved to.
SAVE TO 6
LIMITS
0 - 5000 PSI
%C
%B
%D
C V
>
25.0
L
25.0 25.0
>
I
>
22.2 32.2
36.5 5 L
>
30.0
19.6 33.2
METHOD EDIT 5
TIME %A
^
INIT 25.0
0.00 100.0
123.45 10.0
^
345.67 3.00
17.2
Help prompt
Figure C-5. Method Screen
NOTE In some fields (%A, %B, %C, %D, C, V, and FLOW), a
“blank” field indicates that the parameter for the
previous step remains in effect.
C-6
METHOD
EDIT
The method number (0 through 99) to edit.
SAVE TO
The method number (0 through 99) to save the
current method to.
LIMITS
The low and high pressure limits in psi, MPa, or bar.
Select the unit of measure on the PUMP OPTIONS
screen (see Section C.1.8). See Section 3.1.5 for
guidelines for selecting pressure limits.
TIME
The elapsed time for each method step. Every
method begins with the INIT (initial) step, followed
by the TIME = 0.00 step. Each additional entry under
TIME indicates the elapsed time at which userspecified conditions (eluent percentage, curve
number, flow rate, etc.) occur.
Doc. 031612-03 10/03
C • User Interface
%A–%D
The percentage of each eluent occurring at the start
of the step. The total of all eluents must equal 100%
or the pump cannot run.
C
The gradient curve type (0 through 9) to use when
moving from the previous step to the current step.
See Section 2.8.3 for an explanation of curve types.
V
The position of the injection valve: load or inject.
FLOW
The flow rate (from 0.5 to 5.0 mL/min, or 0) through
the pump. The flow rate is adjustable in increments
of 0.01 mL/min. The GS50 is optimized for
operation at 1.5 mL/min or less.
∨
The ∨ symbol next to the bottom time entry indicates
that it is followed by at least one more step. Move the
cursor to the entry and press the down arrow to see
the additional step(s).
^
The ^ symbol next to the top time entry indicates that
it is preceded by at least one more step. Move the
cursor to the entry and press the up arrow to see the
additional step(s).
>
The > symbol at the end of the line indicates a lateral
extension to the line. Move the cursor to the end of
the line and press the right arrow to display the
METHOD events screen (see Section C.1.5).
Doc. 031612-03 10/03
C-7
GS50 Gradient Pump
C.1.5
Method Events Screen
NOTE The METHOD events screen can be accessed only
from the METHOD screen (see Section C.1.4).
Use the METHOD events screen to view the column selection and
TTL/Relay output parameters for each method step.
SAVE TO 6
METHOD EDIT 5
<
<
<
<
COL
A
B
TTL1
0
1
A
Help prompt
TTL2
1
RLY1
1
0
RLY2
0
0
1
1
RUN 10
TIME
INIT
0.00
123.45
v 345.67
Figure C-6. Method Events Screen
C-8
COLUMN
Selects the active column (A or B) in the
chromatography module. Column B is available only
when a column switching valve is installed.
TTL1
TTL2
RLY1
RLY2
Provides TTL and Relay control of other devices.
Select 1 (on) or 0 (off). See Appendix D for a
description of TTL and Relay control.
Doc. 031612-03 10/03
C • User Interface
C.1.6
Degas Options
NOTE You cannot select the DEGAS OPTIONS screen from
the MENU of SCREENS unless the vacuum degas
assembly (see Section 2.5) is installed.
Use the DEGAS OPTIONS screen to set the duration and frequency of the
vacuum degas pump.
DEGAS OPTIONS
BY SETTING
DEGAS PUMP:
2
MIN
START-UP DURATION:
CYCLE DURATION:
30
TIME BETWEEN CYCLES: 10 MIN
DEFAULT
2 MIN
30 SEC
10 MIN
Help prompt
Figure C-7. Degas Options Screen
DEGAS PUMP
Specifies how the vacuum degas pump operates.
•
BY SETTING: The degas pump runs according
to the timing aspects selected on the DEGAS
OPTIONS screen.
•
MONITOR: The degas pressure reading
determines whether the degas pump is turned on
or off. When the degas pump turns on, it runs for
the selected CYCLE DURATION time (see
below).
•
•
ALWAYS OFF: The degas pump is always off.
ALWAYS ON: The degas pump is always on (this
setting is reserved for test purposes by Dionex
Service Representatives.
START-UP
DURATION
The length of time (2 to 5 minutes) the degas pump
runs after the GS50 power is turned on.
CYCLE
DURATION
The length of time (0 to 120 seconds) the degas pump
runs during each cycle.
Doc. 031612-03 10/03
C-9
GS50 Gradient Pump
TIME BETWEEN
CYCLES
The length of time (1 to 99 minutes) between degas
cycles.
NOTE The DEGAS PUMP CALIBRATION AND STATUS
screen displays the degas threshold value (see
Section C.3.3).
The GS50 monitors the vacuum degas reading at 1-minute intervals. If the
reading is at, or below, the calibration threshold value, the following
message is displayed:
LOW VACUUM ALARM!!
Check DEGAS OPTIONS settings or refer to
service manual
If this message appears, increase the CYCLE DURATION time and/or
decrease the TIME BETWEEN CYCLES. If this does not eliminate the
problem, contact Dionex Technical Support.
C-10
Doc. 031612-03 10/03
C • User Interface
C.1.7
Module Setup
Use the MODULE SETUP screen to select display options.
MODULE SETUP
DISPLAY PANEL BACKLIGHT:
KEY ACTUATION SOUND:
ENTRY ERROR SOUND:
HELP LANGUAGE:
MEDIUM
ON
ON
ENGLISH
Help prompt
Figure C-8. Module Setup Screen
DISPLAY PANEL
BACKLIGHT
Sets the brightness of the display panel backlight to
low, medium, or high.
KEY ACTUATION
SOUND
Enables and disables the beep that occurs when a
front panel key is pressed.
ENTRY ERROR
SOUND
Enables and disables the beep that occurs when a
wrong entry is made.
HELP LANGUAGE
Selects the language for Help and error messages:
English or Japanese.
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C-11
GS50 Gradient Pump
C.1.8
Pump Options
Use the PUMP OPTIONS screen to select default operating parameters for
the GS50.
PUMP OPTIONS
TTL2 OUTPUT USAGE:
PRESSURE UNITS:
COMPRESSIBILITY:
DEGAS PUMP OPTION:
NORMAL
PSI
xxxx
YES
Help prompt
Figure C-9. Pump Options Screen
C-12
TTL2
OUTPUT
USAGE
Specifies the active state of the TTL2 output signal.
NORMAL defines TTL2 as a regular TTL output
programmed in a method.
0 FLOW can be used to automatically switch off the
power to the Self-Regenerating Suppressor (SRS)
when the pump flow stops. For instructions on how
to set up this function, see Section B.3.
PRESSURE
UNITS
Sets the unit of measure for pressure: psi, MPa, or
bar.
COMPRESSIBILITY
Sets the eluent compressibility factor, a feature that
helps to optimize the solvent flow stability. The
settable range is 0 to 2500 counts; the default, 460
counts, is optimized for deionized water.
DEGAS PUMP
OPTION
Indicates whether the optional vacuum degas
assembly is installed (see Section 2.5).
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C • User Interface
C.1.9
Time Function In
Use the TIME FUNCTION IN screen to:
•
Display GS50 functions that can be controlled via TTL input from
another device.
•
Select a TTL signal mode for each function.
See Appendix D for more information about TTL-controlled functions
and connections.
TIME FUNCTION IN MODE:
INVERTED EDGE
PUMP MOTOR OFF/ON:
HOLD-RESET-INIT COND/RUN:
TTL1
TTL2
Help prompt
Figure C-10. Time Function In Screen
MODE
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Selects the signal mode (NORMAL EDGE,
INVERTED EDGE, NORMAL PULSE, or INVERTED
PULSE) that corresponds to the signal type of the
controlling device.
The default mode, NORMAL EDGE, is compatible
with the TTL output signals provided by Dionex
modules.
C-13
GS50 Gradient Pump
C.2
Diagnostic Screens
C.2.1
Diagnostic Menu
The DIAGNOSTIC MENU lists the diagnostic screens. To go to the menu,
select option 8 from the MENU of SCREENS.
DIAGNOSTIC MENU
4 USAGE LOG
1 POWER-UP SCREEN
2 PRESSURE STATISTICS 5 DIAGNOSTIC TESTS
3 CALIBRATION MENU
Help prompt
Figure C-11. Diagnostic Menu
There are two ways to view a screen option:
•
Press the numeric button on the GS50 front panel keypad that
corresponds to the screen number on the menu. For example, press 3
to select and display the CALIBRATION MENU.
•
Move the cursor to the field containing the screen number and press
Enter.
To display a brief description of each screen, press Help.
C-14
Doc. 031612-03 10/03
C • User Interface
C.2.2
Power-Up Screen
NOTE The POWER-UP screen is displayed briefly when the
GS50 power is turned on.
Use the POWER-UP screen to check the revision levels of the DSP BIOS,
main DSP code, Moduleware, and BIOS installed in the GS50, as well as
the ID (identification) number of the DX-LAN (if connected). An asterisk
indicates which DSP code is currently running.
GS50 GRADIENT PUMP
DSP
BIOS nn.nn
*MAIN nn.nn
Help prompt
nn.nn
MODULEWARE REV
nn.nn
BIOS REV
DX-LAN ID# nnnnnn
Figure C-12. Power-Up Screen
Doc. 031612-03 10/03
C-15
GS50 Gradient Pump
C.2.3
Pressure Statistics
Use the PRESSURE STATISTICS screen to view statistical data about the
pressure transducer (see Section 2.4.2). The status values are updated
while the screen is displayed.
PRESSURE STATISTICS
PRESSURE:
MAX:
MIN:
DURATION:
xxxx.xx
xxxx.xx
xxxx.xx
xxxx.xx
PSI
PSI
PSI
minutes
Help prompt
Figure C-13. Pressure Statistics Screen
If a method is running while the PRESSURE STATISTICS screen is
displayed, the following message appears:
Active Method Lowers MIN/MAX Resolution
To obtain more accurate readings, abort the method, select the Direct
control mode, and go to the PRESSURE STATISTICS screen again.
PRESSURE
The measured pressure from the pressure transducer.
MAX
The maximum pressure value for the duration of the
test.
MIN
The minimum pressure value for the duration of the
test.
DURATION
The duration of the test. Testing starts when the
screen is opened; to terminate the test, press Menu.
To restart the test, press Reset; this sets the duration
to 0 and sets all status values to the current pressure.
NOTE For a description of the CALIBRATION MENU, refer
to Section C.3.
C-16
Doc. 031612-03 10/03
C • User Interface
C.2.4
Usage Log
Use the USAGE LOG screen to check for how long certain GS50
components have been in use. The status is updated in real time.
USAGE LOG
MODULE ON:
BACKLIGHT:
SEALS IN USE:
VALVES IN USE:
nnnnnnnn
nnnnnnnn
nnnnnnnn
nnnnnnnn
hours
hours
cycles
cycles
RESET
*
*
Help prompt
Figure C-14. Usage Log Screen
MODULE ON
Reports the total time the GS50 has been powered up
in its lifetime.
BACKLIGHT
Reports the total time the display backlight has been
on in its lifetime.
SEALS IN USE
Reports the total number of pump cycles that the
piston seals have gone through. Reset this field to 0
after servicing or replacing the piston seals.
VALVES IN USE
Reports the total number of pump cycles that the
check valves have been actuated. Reset this field to 0
after servicing or replacing the check valves.
RESET
Resets the SEALS IN USE or VALVES IN USE
counter to 0. Move the cursor to the corresponding
asterisk (*) field and press Enter. Reset the counter
for the seals and valves to 0 after servicing or
replacing these parts.
Doc. 031612-03 10/03
C-17
GS50 Gradient Pump
C.2.5
Diagnostic Tests
Use the DIAGNOSTIC TESTS screen to test the GS50 electronics
components.
DIAGNOSTIC TESTS
- LOOP COM
- DSP COM
- POWER
- CPU
- PUMP LEAK
- OVEN COM
Help prompt
Figure C-15. Diagnostic Tests Screen
When the GS50 power is turned on, some of the electronics tests run
automatically. To run a test manually, position the cursor in the edit field
next to the test name, press a Select button to select the asterisk (*), and
press Enter. The table below explains the test status indicators.
C-18
Character
Test Status
_
Test did not run
>
Test is in progress
P
Test passed
F
Test failed
POWER
Checks that the DC power supplies are within 5%
tolerance.
CPU
Checks the CPU internal configuration and
Moduleware checksum.
LOOP COM
Checks the serial communication hardware, using a
loop-back cable.
Doc. 031612-03 10/03
C • User Interface
DSP COM
Checks communication between the pump CPU and
the DSP (digital signal processor) hardware.
PUMP LEAK
Checks the GS50 leak sensor hardware for a correct,
open circuit, or short circuit condition.
OVEN COM
Checks communication between the GS50 and the
LC30 Chromatography Oven.
EXTERNAL LEAK
Checks the leak sensor hardware in the LC10
Chromatography Organizer or LC25
Chromatography Oven.
Doc. 031612-03 10/03
C-19
GS50 Gradient Pump
C.3
Calibration Screens
C.3.1
Calibration Menu
The CALIBRATION MENU lists the calibration screens. To display the
menu, select option 3 on the DIAGNOSTIC MENU.
CALIBRATION MENU
1
2
3
4
5
LEAK CAL & STATUS
DEGAS CALIBRATION
FLOW CALIBRATION
PRESSURE OFFSET CALIBRATION
PRESSURE RIPPLE CALIBRATION
Help prompt
Figure C-16. Calibration Menu
NOTE You cannot select the DEGAS CALIBRATION screen
unless the vacuum degas assembly (see Section 2.5) is
installed.
There are two ways to view a screen option:
•
Press the numeric button on the GS50 front panel keypad that
corresponds to the screen number on the menu. For example, press 3
to select and display the FLOW CALIBRATION screen.
•
Move the cursor to the field containing the screen number and press
Enter.
To display a brief description of each screen, press Help.
C-20
Doc. 031612-03 10/03
C • User Interface
C.3.2
Leak Sensor Calibration and Status
Use the LEAK SENSOR CALIBRATION AND STATUS screen to check the
status of leak sensor parameters and to calibrate the sensor(s).
•
The PUMP column displays the status of the GS50 leak sensor.
•
The EXTERNAL column displays the status of the leak sensor in the
chromatography module. If no chromatography module is connected
to the GS50, the EXTERNAL fields display NONE.
LEAK SENSOR CALIBRATION AND STATUS
EXTERNAL
PUMP
MEASURED VALUE:
DRY
CAL
CURRENT CONDITION:
2.51
CALIBRATION VALUE:
NONE
NONE
2.41
LOW LEAK THRESHOLD:
Help prompt
Figure C-17. Leak Sensor Calibration and Status
Doc. 031612-03 10/03
MEASURED
VALUE
The current measured voltage from the leak sensor.
CURRENT
CONDITION
The current condition of the leak sensor: dry, wet, or
err (error). The error condition indicates an open or
short circuit.
To calibrate the sensor, press a Select button to
select CAL and press Enter. The current measured
value becomes the new dry calibration value.
CALIBRATION
VALUE
The value saved when the leak sensor was last
calibrated.
LOW LEAK
THRESHOLD
The minimum voltage reading interpreted as
meaning that the leak sensor is dry; a reading below
this voltage indicates that the sensor is wet.
C-21
GS50 Gradient Pump
C.3.3
Degas Pump Calibration and Status
NOTE You cannot select the DEGAS PUMP CALIBRATION
screen unless the vacuum degas assembly (see
Section 2.5) is installed.
Use the DEGAS PUMP CALIBRATION screen to check the current pressure
reading of the vacuum degas assembly and calibrate the degas assembly.
DEGAS PUMP CALIBRATION AND STATUS
DEGAS READING: xxxx
CALIBRATION VALUE: xxxx
STATUS: OFF
CAL: RDY
Help prompt
Figure C-18. Degas Pump Calibration and Status Screen
C-22
DEGAS READING
Reports the current degas pressure reading.
CALIBRATION
VALUE
Reports the calibration value recorded when the
vacuum degas assembly was last calibrated.
STATUS
Reports whether the vacuum degas assembly is on or
off.
CAL
To calibrate the vacuum degas assembly, press a
Select button to select CAL and then press Enter.
Doc. 031612-03 10/03
C • User Interface
C.3.4
Flow Calibration
Use the FLOW CALIBRATION screen to recalibrate the pump. After
running the flow calibration sequence, wait at least 15 minutes for the
pump to re-equilibrate before verifying the flow accuracy.
PRESSURE: xxxx PSI
FLOW CALIBRATION
SELECT:
PRESS ENTER.
READY
STABILIZE AT 1.00 mL/MIN AT 2000 PSI FOR
50 MINUTES. COLLECT WATER INTO A TARED
BEAKER FOR 5 MINUTES. ENTER THE WEIGHT
OF THE WATER: x.xxxx g. WAIT 15 MINUTES
BEFORE RE-CHECKING.
Help prompt
Figure C-19. Flow Calibration Screen
SELECT
To start the flow calibration sequence, toggle the
field from READY to STANDARD CAL and press
Enter. The pump runs at 1.0 mL/min during
calibration.
PRESSURE
Reports the current pump pressure in psi, MPa, or
bar. Select the pressure unit from the PUMP
OPTIONS screen (see Section C.1.8).
WEIGHT OF
THE WATER
After calibration, enter the measured weight of the
water pumped into the beaker in this field.
Doc. 031612-03 10/03
C-23
GS50 Gradient Pump
C.3.5
Pressure Offset Calibration
Use the PRESSURE OFFSET CALIBRATION screen to calibrate the pump
pressure offset.
PRESSURE OFFSET CALIBRATION
OPEN WASTE VALVE BEFORE STARTING.
CALIBRATION:
PRESSURE:
OFFSET:
Help prompt
RDY
xxxx PSI
xxx PSI
Figure C-20. Pressure Offset Calibration Screen
C-24
CALIBRATION
To begin the pressure offset calibration, toggle the
field from RDY to CAL and press Enter. After
confirming that the pump is off, open the waste valve
(see Figure 2-6) by turning the knob one-quarter to
one-half turn counterclockwise.
PRESSURE
The current pressure reading from the transducer.
OFFSET
The calibrated offset value.
Doc. 031612-03 10/03
C • User Interface
C.3.6
Pressure Ripple Calibration
Use the PRESSURE RIPPLE CALIBRATION screen to calibrate the pressure
ripple. For more details, see Section 3.1.6.
PRESSURE RIPPLE CALIBRATION
CALIBRATION: READY
DURATION:
xxx.xx min
Help prompt
Figure C-21. Pressure Ripple Calibration Screen
CALIBRATION
DURATION
Doc. 031612-03 10/03
•
CALIBRATE: To start a pressure ripple
calibration sequence, toggle the field from
READY to CALIBRATE and press Enter. During
calibration, the pump runs at the currently
selected flow rate (or at 1.0 mL/min, if the
selected flow rate is zero).
Notes: (a) The Menu button is disabled while
the calibration sequence is running. (b) To
terminate a calibration sequence, toggle the field
to READY and press Enter.
•
GET DATA: Updates the pressure ripple data
•
DEFAULTS: Sets the pressure ripple data to the
factory default values; these are the theoretical
values for pump operation at 1.0 mL/min with
15 MPa (2200 psi) of backpressure.
with the latest operating ripple data.
Reports the time remaining until the calibration
sequence is finished. At a flow rate of 1.0 mL/min, it
takes about 13 minutes to run the calibration
sequence.
C-25
GS50 Gradient Pump
C-26
Doc. 031612-03 10/03
D • TTL and Relay Control
The strip of eight 2-pin connectors on the GS50 electronics chassis provides two
relay outputs, two TTL outputs, and four TTL inputs (see Figure D-1).
NOTE Before connecting the GS50 to a non-Dionex device,
check the user’s manual for the device to verify that it is
compatible with the GS50 TTL and relay signals.
•
If necessary, connect the outputs to the TTL or relay inputs of a device to
trigger functions in the connected device.
•
If necessary, connect the inputs to a device to trigger two pump functions:
pump motor on/off and method clock on/off.
For a description of TTL and relay output operation or TTL input operation,
respectively, see Section D.1 or Section D.2. For instructions on how to connect
the GS50 TTLs and relays to other devices, see Section D.3.
(Unused)
(Unused)
Figure D-1. TTL/Relay Connector Strip
(GS50 front view without upper door)
Doc. 031612-03 10/03
D-1
GS50 Gradient Pump
D.1
TTL and Relay Output Operation
The GS50 provides two TTL outputs and two relay contacts for the control of
functions in external devices. For example, the external device might be an
integrator, autosampler, or another Dionex module.
After connecting the TTL and Relay outputs (see Section D.3), toggle the output
states on and off from either the DETAIL screen (see Section C.1.3) or the METHOD
events screen (see Section C.1.5).
•
To turn on a TTL or relay output, set the corresponding output field on the
DETAIL screen or METHOD events screen to 1 (closed).
•
To turn off a TTL or relay output, set the corresponding output field on the
DETAIL screen or METHOD events screen to 0 (open).
For example, when TTL2 is connected to the Load relay on the Dionex AS40
Autosampler, setting TTL2 to 1, as shown in Figure D-2, sends a signal to the
AS40 to start the load cycle.
0
DETAIL SCREEN
1
100.0 %A
2125 PSI
0
0.0 %B
2.00 mL/MIN
1
%C
SAMPLE
0.0
INJECT
0.0 %D
COLUMN A
0-5000 PSI
LIMITS
CURVE 5
REMOTE
METHOD 5
10.25 MIN
Help prompt
Figure D-2. Detail Screen
D-2
Doc. 031612-03 10/03
D • TTL and Relay Control
D.2
TTL Input Operation
The two TTL inputs can be connected to devices capable of providing TTL output
signals. The signal from the connected devices can trigger the following functions
in the GS50:
•
TTL input 1 turns the pump motor on and off.
•
TTL input 2 turns the pump method clock on (Run) and off (Hold/Reset).
Hold/Reset resets the method clock to zero and executes the INIT conditions,
although the method cannot run unless the pump motor is on.
D.2.1
TTL Input Signal Modes
The GS50 TTL inputs respond to four different types of device output
signals. The default signal mode, normal edge, is compatible with the
output signals provided by Dionex modules. If the device connected to
the GS50 outputs a different signal type, select the appropriate mode from
the TIME FUNCTION IN screen (see Figure D-3).
TIME FUNCTION IN MODE:
INVERTED EDGE
PUMP MOTOR OFF/ON:
HOLD-RESET-INIT COND/RUN:
TTL1
TTL2
Help prompt
Figure D-3. Time Function In Screen
There are four input signal modes:
•
Normal Edge: In normal edge operation, the negative (falling) edge of
a signal turns on the function and the positive (rising) edge turns off
the function (see Figure D-4). For example, a negative edge sent to
TTL1 turns on the pump motor and a positive edge turns off the
motor.
•
Inverted Edge: The inverted edge mode operates identically to the
normal edge mode, except that the positive and negative edges are
reversed in function.
Doc. 031612-03 10/03
D-3
GS50 Gradient Pump
•
Normal Pulse: In normal pulse operation, the negative (falling) edge
of the TTL signal is the active edge and the positive (rising) edge is
ignored. For example, applying a negative pulse to TTL1 when the
pump motor is off turns on the motor.
The minimum pulse width guaranteed to be detected is 50 ms. The
maximum pulse width guaranteed to be ignored as noise or invalid is
4 ms. The action of the GS50 is undefined for pulses less than 50 ms
or greater than 4 ms.
•
Inverted Pulse: The inverted pulse mode operates identically to the
normal pulse mode, except that the positive and negative edges are
reversed in function.
Figure D-4. TTL and Relay Input Signal Modes
D-4
Doc. 031612-03 10/03
D • TTL and Relay Control
D.3
TTL and Relay Connections
The TTL/relay connector strip is on the electronics chassis, behind the upper door
of the GS50 enclosure (see Figure D-1). Each 2-pin connector includes a signal
pin and a ground pin.
1. Locate the twisted pairs of wires (P/N 043598) and 2-pin connector plugs
(P/N 921019) provided in the GS50 Ship Kit (P/N 061222). Attach a 2-pin
plug to each end of the twisted pair of wires to be connected.
NOTE The signal wire must be on the top of each plug and the
ground wire must be on the bottom of each plug.
2. Connect these plugs to the TTL or relay connectors on the GS50 and the other
instrument(s) as needed for the application. Be sure to connect signal wires to
signal (+) pins and ground wires to return (-) pins. If necessary, remove wires
from the 2-pin plugs and reinsert them in the correct positions. Section D.3.1
shows example connections.
3. Route the wires from the GS50 electronics chassis through the upper chase to
the rear panel.
Doc. 031612-03 10/03
D-5
GS50 Gradient Pump
D.3.1
Example Connections
Figure D-5 shows an example of TTL/relay connections for a Dionex
system connected to an AS40 Automated Sampler. Refer to the AS40
operator's manual for details.
Pump
AS40
LOAD
4
+5VDC <50mA
G ND
3
G ND
CBL PRESENT
LOAD
2
F2
G ND
1
G ND
G ND
READY OUT
RELAY CONTROL
READY
5
Detector
RLY-1
OUT
RLY-2
OUT
TTL-1
OUT
TTL-2
OUT
TTL-1
IN
TTL-2
IN
TTL-3
IN
TTL-4
IN
RLY-1
OUT
RLY-2
OUT
TTL-1
OUT
TTL-2
OUT
TTL-1
IN
TTL-2
IN
TTL-3 Not Used
IN
TTL-4 Not Used
IN
AS40 Relay Control Cable
(P/N 047946)
DX-LAN
Chromatography Workstation
Figure D-5. Example TTL and Relay Connections: AS40
D-6
Doc. 031612-03 10/03
E • Reordering Information
Part Number
Item
Quantity
Primary Pump Head Components
052840
058032
048722
059283
057913
014895
055870
047660
047657
055711
055709
055752
Piston
Seal Wash Housing Guide
Piston Rinse Seal
O-Ring
Spacer with Drain
O-Ring
Piston Seal
Inlet Check Valve Assembly
Outlet Check Valve Assembly
Primary Pump Head
Priming Valve Knob
Priming Valve Knob O-Ring
1
1
1
1
1
1
1
1
1
1
1
1
Secondary Pump Head Components
052840
058032
048722
059283
057913
014895
055870
055712
055710
055752
Piston
Seal Wash Housing Guide
Piston Rinse Seal
O-Ring
Spacer with Drain
O-Ring
Piston Seal
Secondary Pump Head
Waste Valve Knob
Waste Valve Knob O-Ring
1
1
1
1
1
1
1
1
1
1
046203
Eluent Proportioning Valve Assembly
1
049136
GM-4 Gradient Mixer
1
044126
Glass Reservoir (shatterproof plastic coating), 1 Liter
1
Doc. 031612-03 10/03
E-1
GS50 Gradient Pump
E-2
Part Number
Item
Quantity
044127
044128
044129
045987
046594
Glass Reservoir (shatterproof plastic coating), 2 Liters
Plastic Reservoir, 1 Liter
Plastic Reservoir, 2 Liters
Filter, End-Line
Pressure Regulator (for gas supply line to reservoirs)
1
1
1
1
1
042772
054578
Fitting Plug, 10-32
Syringe, 10 mL
1
1
954745
921019
043598
3.15 Amp Fuse (Fast-Blow IEC 127)
2-Pin TTL/Relay Connector
Twisted Wire Assembly
1
1
2 m (8 ft)
Doc. 031612-03 10/03
Index
A
Aborting a running method, 3-14
Actuator for main power switch, 2-1
Air pressure requirements, 3-2
Air solenoid valves, 2-10
Annual maintenance, 3-24
Arrow buttons, 2-2, 2-5
Automated control of GS50, 1-1
B
Backlight
Adjusting the brightness, C-11
Time in use, C-17
Backup seals
Maintenance, 3-24
Blank field in method step, 3-10
Button descriptions, 2-4 – 2-5
C
Cables
DX-LAN, B-6
Front panel (60-pin ribbon cable), 2-11
LC10/LC20 leak sensor, B-5
LC10/LC20 solenoid valve, B-5
LC30 serial interface, B-4
Power cord, 5-14, B-3
Calibration Menu, C-20
Calibration procedures
Degas assembly, C-22
Flow rate, C-23
Leak sensor, C-21
Pressure offset, C-24
Pressure ripple, 3-5 – 3-6
Cascading hubs, B-6
Caution icon, 1-4 – 1-5
Doc. 031612-03 10/03
Check valves, 2-15
Cause of pressure fluctuations, 4-2
Cleaning procedure, 5-1, 5-3
Maintenance, 3-24
Malfunction, 4-14
Replacement procedure, 5-1, 5-3
Time in use, C-17
Chromatography modules
Connections to electronics chassis, B-4
Chromeleon software, 1-1, 2-10
Connect command, 2-21
Locked Remote mode, 2-19, 2-21
Clock
See Method clock
Column switching valve
Selecting, C-8
Columns
Backpressure, 4-5
Damage from IPA, B-14
Compressibility factor (eluents), C-12
Concave linear curve, 2-23
Connect command, 2-21
Connectors
LC AIR, 2-10
LC COMM, 2-10
PRES, 2-11
Rear panel, 2-18
Connectors on electronics cards, 2-9
TTL/Relay control, 2-11
Control modes, 2-21
Direct, 2-20
Method, 2-20 – 2-21
Selecting, 2-20
Control panel, 2-1
Keypad, 2-2
Conventions in manual, 1-4
Convex gradient curves, 2-23 – 2-24
Index-1
GS50 Gradient Pump
CPU/LAN card, 2-11, 4-6, B-6
LED colors, 4-4
Creating a method, 3-10
Cursor movement, 2-2, 2-5
Curve field
Detail screen, C-5
Curved gradient
Method example, 3-19
Curves
See Gradient curves
Types, 2-23
D
Daily maintenance, 3-23
Danger icon, 1-4 – 1-5
Definition, 2-2
Degas assembly, 2-16
Calibration fails, 4-11
Calibration procedure, C-22
Daily maintenance, 3-23
Vacuum is low, 4-12
Degas Options screen, C-9
Degas pump, 4-1
Calibration, C-22
Frequency of operation, 4-2
Specifications, A-3
Degas Pump Calibration and Status screen,
C-22
Degassing eluents, 1-1, 2-16, 3-1
Delay volume, 1-2, A-2
Delay volume conversion kit, 1-2
Delete
Method, 2-4, 3-14
Method steps, 2-4
Delete button, 2-4
Detail screen, C-5
Diagnostic Menu, C-14
Calibration Menu, C-20
Degas Pump Calibration and Status, C-22
Diagnostic Tests, C-18
Flow Calibration, C-23
Leak Sensor Calibration and Status, C-21
Index-2
Power-Up, C-15
Pressure Offset Calibration, C-24
Pressure Statistics, C-16
Usage Log, C-17
Diagnostic Tests screen, C-18
Direct control mode, 2-20, 3-7
Display and keypad specifications, A-1
Display panel, C-17
Adjusting brightness, C-11
Adjusting contrast, 2-1
Distribution card, 4-10 – 4-11
DSP card, 4-6
Troubleshooting, 4-9
DSP program, 1-1, 2-14, 3-9
Error messages, 4-6
DX-LAN cable
Installation, B-6
Specifications, B-6
DX-LAN interface, 1-1, 2-19, A-3
Installation, B-6
Locked Remote mode, 2-21
Rear panel connector, 2-18
E
Editing a method, 3-13
Editing a running method, 3-21
Electrical specifications, A-1
Electronics chassis, 2-9
CPU/LAN card, 2-11
LC COMM connector, 2-10
LC LEAK connector, 2-9
PRES, 2-11
TTL/Relay connections, 2-11, D-5
Eluent reservoirs
See Reservoirs
Eluents
Aqueous, 3-24, 4-2
Compressibility factor, C-12
Connections to pump, B-7
Degassing, 1-1, 2-16
Filtering, 3-2, 4-2, 4-15
Flow schematic, 2-15
Doc. 031612-03 10/03
Index
Flushing lines after eluent change, 4-13
Gradient runs, 2-23
Installation of reservoirs, B-1
Isocratic runs, 2-23
Specifying composition, 3-9
Step gradient, 2-24
End-line filter
See Filter, end-line, 3-2, 4-15
English
On-screen messages, C-11
Enter button, 2-6
Environmental specifications, A-1
EO1 Eluent Organizer, 2-18, B-1
Error messages
DSP-related, 4-6
Encoder index not found, 4-7
High pressure limit violation, 4-3, 4-5
Language options, C-11
Low pressure limit violation, 4-3 – 4-4
Low vacuum alarm, 4-12
Motor drive fails, 4-7
TTL2 indicates FLOW/NO FLOW, 4-13
Vacuum degas fails, 4-11
Error sounds, 2-3, C-11
Ethernet hub, B-6
Example methods, 3-15 – 3-16, 3-19
F
Facilities required, B-1
Fields (on-screen)
Blank, 2-4
Reverse video, 2-2
Filter, end-line
Bacterial contamination, 3-24, 4-2
Dirty or clogged, 4-2
Installation, 3-2, 4-15
Maintenance, 3-24
Flow Calibration screen, C-23
Flow rate
Calibration, C-23
Range, A-2
Selection, 3-9
Doc. 031612-03 10/03
Stabilization by DSP, 3-9
Flow restrictions, 3-24
Flow schematic, eluents, 2-15
Front panel, 2-1, 2-3, C-11
Button descriptions, 2-5
Display screens, 2-7
Keypad, 2-2
Ribbon cable, 2-11
Front panel control, 2-21
Functional description
Method control, 2-21
Fuses, 2-18, A-1
Replacement procedure, 5-14
G
Generating a method, 3-10
GM-4 Gradient Mixer, 2-14, B-7
GM-5 Gradient Mixer, 2-14
Gradient control specifications, A-3
Gradient curves, 2-23
Concave, 2-23
Convex, 2-23 – 2-24
Linear, 2-23
Gradient eluent run, 2-23
Curved gradient example, 3-19
Linear gradient method example, 3-16
Gradient mixer, 2-14
Installation, B-7
Gradient steps, 2-23
GS50 Gradient Pump
Changing the delay volume, 5-16
Decibel level, A-1
Delay volume change, 5-15
Dimensions, A-1
Liquid flow path, 2-15
Maintenance, 3-23 – 3-24
Operating humidity, A-1
Operating pressure, A-2
Operating temperature, A-1
Options, 1-2
Power switch, 2-1
Product warranty, 5-1
Index-3
GS50 Gradient Pump
Remote control, 1-1
Safety messages, 3-2
Safety standards, 1-4
Ship Kit, 2-11, B-2
Spare parts, E-1
Weight, A-1, B-1
Waste lines, B-7
Inverted edge, D-4
Inverted pulse, D-4
Isocratic eluent run, 2-23
Method example, 3-15
Isopropyl alcohol, B-14
H
J
Help messages, 2-5, C-2, C-14, C-20
Language options, C-11
High pressure limit, 3-4, A-2
Limit is tripped, 4-3, 4-5
Selecting, 3-4
Hold/Run button, 2-4, 3-14
Host computer, 2-10, 2-19, 2-21
Hub, Ethernet, B-6
Hydraulic specifications, A-2
Japanese
On-screen messages, C-11
I
Important icon, 1-4
Initial conditions, 2-4, 3-11
Injection valve
Selecting the position, 3-9
Inlet check valve, 2-15
Insert button, 2-3
Installation, B-1
DX-LAN interface, B-6
Electronics chassis connections, B-4
Eluent reservoirs, 2-17, B-7
Facilities required, B-1
LC LEAK connector, 2-9
LC10 connections, B-5
LC20 connections, B-5
LC25 connections, B-4
LC30 connections, B-4
Power connection, B-2
Pressure limit settings, 3-4
Priming, B-11 – B-14
Rear panel connections, 2-18
TTL/Relay connections, 2-11, D-5
Index-4
K
Keypad buttons, 2-2
Delete, 2-4
Enter, 2-6
Hold/Run, 2-4
Insert, 2-3
Key press sound, 2-3, C-11
Menu, 2-5
Numeric buttons, 2-6
Reset, 2-4
L
LC AIR connector, B-4 – B-5
LC COMM connector, 2-10, B-4
LC LEAK connector, 2-9, B-4 – B-5
LC10 Chromatography Organizer
Connections to pump, B-5
Leak control cable, 2-9
Solenoid valve connections, 2-10, B-5
LC20 Chromatography Enclosure
Connections to pump, B-5
Leak control cable, 2-9
Solenoid valve connections, 2-10, B-5
LC25 Chromatography Oven
Connections to pump, B-4
Eluent containment, B-1
LC30 Chromatography Oven
Communication with pump, 2-10
Doc. 031612-03 10/03
Index
Connections to pump, B-4
Control of pump power, B-3
Solenoid valve connections, 2-10
LCD contrast, 2-1
Leak alarm, 4-7
Leak drain
Waste line, B-7
Leak sensor
Calibration procedure, C-21
Leak sensor cable (LC10/LC20), B-5
Leak Sensor Calibration and Status screen,
C-21
Leaks, 2-9, 3-23, 4-7
LED
Power supply status, 2-11
Limit field
Detail screen, C-5
Linear gradient curve, 2-23, 3-16
Liquid crystal display (LCD)
Adjusting screen contrast, 2-1
Liquid lines, 5-2
Leaks, 4-7
Local mode, 2-19, 2-21
Local operating mode, 2-21
Locked Remote mode, 2-19, 2-21
Selecting, 2-21
Low delay volume, 1-2, 5-15, A-2
Gradient mixer, 2-14
Low pressure limit, 3-4, A-2
Limit is tripped, 4-3 – 4-4
Selecting, 3-4
M
Maintenance, 3-23
Annual, 3-24
Daily, 3-23
Every 6 months, 3-24
Ongoing, 3-23
Routine, 3-23
Weekly, 3-24
Yearly, 3-24
Menu button, 2-5
Doc. 031612-03 10/03
Menu of Screens, C-2
Degas Options, C-9
Detail, C-5
Method, C-6
Method events, C-8
Module Setup, C-11
Pump Options, C-12
Time Function In, C-13
Menu structure, C-1
Method clock, 2-22
Controlling, D-3
Holding (pausing), 2-4
Resetting, 2-4
Setting the elapsed time, 3-14
Starting a method, 3-12
Method control, 2-20 – 2-21, 3-9
Method events screen, C-8
Method number, C-4
Method screen, C-6
Method steps
Blank (empty) fields, 3-10
Definition, 2-22
Deleting, 2-4
Entering, 3-9, C-6
Inserting, 3-11
Restoring the previous value, 2-4
Setting step times, C-6
Methods, 2-2
Aborting, 3-14
Control, 3-9
Creating, 3-10
Curved gradient example, 3-19
Deleting, 2-4, 3-14
Deleting a step, 3-13
Editing, 3-13
Editing while running, 3-15, 3-21
Examples, 3-15
Gradient curve types, 2-23
Gradient eluent run, 2-23
Gradient steps, 2-23
INIT conditions, 3-11
Inserting a step, 2-3
Isocratic eluent run, 2-23, 3-15
Linear gradient example, 3-16
Index-5
GS50 Gradient Pump
Maximum number, 2-22
Maximum number of steps, 2-22
Running, 3-12
Step gradient, 2-24
Modes of operation
See Operating modes
Module Setup screen, C-11
Moduleware, 2-11
Programming the pump, 3-15
Running a method, 3-12
Selecting pressure limits, 3-4
Shutdown, 3-25
Operational screens, C-2
Outlet check valve, 2-15
N
PeakNet 6 software, 1-1, 2-10
Connect command, 2-21
Locked Remote mode, 2-19, 2-21
PEEK components, 5-2
Physical description
Control panel, 2-2
Degas assembly, 2-16
Pressure transducer, 2-14
Rear panel, 2-18
Physical specifications, A-1
Piston seal wash assembly, 2-14, 3-23
Connections, B-8
Maintenance, 3-24
Piston seals
Cause of pressure fluctuations, 4-2
Maintenance, 3-24
Replacement procedure, 5-4, 5-7 – 5-8
Sources of damage, 3-25
Time in use, C-17
Pistons
Maintenance, 3-23 – 3-25
Replacement procedure, 5-9
Power cord, 5-14, B-3
Power fault, 2-11, 4-4
Power requirements, A-1
Power supply, 2-11
Power switch, 2-1
Power-Up screen, C-15
Pressure limits, 3-4
Pressure offset calibration, C-24
Pressure Offset Calibration screen, C-24
Pressure ripple, A-2
Pressure ripple calibration, 3-5 – 3-6
Pressure Ripple Calibration screen, C-25
Normal edge, D-3
Normal pulse, D-4
NOTES in manual, 1-5
Numeric buttons, 2-6
O
Off/On button, 2-3
Operating modes
Direct control, 3-7
Local mode, 2-19, 2-21
Locked Remote mode, 2-19, 2-21
Method control, 2-21
Selecting, 2-19
TTL input, 2-19
Operating pressure test, 2-11
Operation, 3-1
Aborting a running method, 3-14
Creating a method, 3-10
Curved gradient method example, 3-19
Deleting a method, 2-4, 3-14
Editing a method, 3-13
Editing a running method, 3-21
Gradient curve types, 2-23
Gradient eluent run, 2-23
INIT conditions, 3-11
Isocratic eluent method, 2-23, 3-15
Linear gradient method example, 3-16
Method control, 3-9
Preparing to run, 3-1
Priming, B-11 – B-14
Index-6
P
Doc. 031612-03 10/03
Index
Pressure Statistics screen, C-16
Pressure transducer, 2-14 – 2-15, 4-5
Pressure units, C-12
Priming, 2-3, B-11
Pump is out of prime, 4-2
Reasons pump needs priming, 4-1
With a syringe, B-11
With isopropyl alcohol, B-14
With the Prime button, B-13
Priming valve
Opening, 2-12
O-ring replacement procedure, 5-11
Printed circuit boards, 2-9
Connectors, 2-9
CPU/LAN card, 2-11
Distribution card, 4-10 – 4-11
DSP card, 4-6, 4-9
Repair, 4-6
Problems
See Troubleshooting
Programming the pump, 3-15
Gradient eluent run, 2-23
Proportioning valves, 1-1, 2-15
Flushing, 3-25
Leaks, 4-8
Malfunction, 4-14
Priming, B-12 – B-14
Replacement procedure, 5-12
Pump head, primary
Description, 2-12
Priming valve, 2-12
Pump head, secondary
Description, 2-13
Waste line, B-7
Waste valve, 2-13, B-7
Pump heads, 2-1
Piston seal wash assembly, 2-14, 3-23
Priming mode, 2-3
Pump motor control, 2-3
Pump Options screen, C-12
Doc. 031612-03 10/03
R
Rear panel, 2-18
DX-LAN interface, B-6
Fuses, 2-18
Power receptacle, 2-18
Waste lines, B-7
Relay connectors, 2-11
See also TTL/Relay control
Remote control of GS50, 1-1, 2-21
Remote mode, C-4
Reproducibility is poor, 4-13
Reservoirs, 2-17
Cleaning, 3-23, 4-14
Glass, 2-17
Installation, 2-17, B-7
Installation in EO1, 2-18, B-1
Installation in LC25 container, B-1
Plastic, 2-17
Shutdown, 3-25
Reset button, 2-4, 3-14
Running a method, 3-12
S
Safety icons, 1-4 – 1-5, 3-2
Safety messages, 1-4
Salt crystals, 3-25
Schematic, eluent flow, 2-15
Screen contrast, 2-1
Seal replacement, 5-7 – 5-8
Select buttons, 2-2, 2-5
Self-Regenerating Suppressor (SRS)
Automatic shutoff, B-15, C-12
Power control, 4-13
Service procedures, 5-1
Check valve cleaning, 5-1, 5-3
Check valve replacement, 5-1, 5-3
Fuse replacement, 5-14
Piston replacement, 5-9
Piston seal replacement, 5-4
Priming valve O-ring replacement, 5-11
Proportioning valve replacement, 5-12
Index-7
GS50 Gradient Pump
Waste valve O-ring replacement, 5-11
Ship Kit, B-2
Shutdown, 3-25
Signal modes for TTL input, D-3
Six-month maintenance, 3-24
Software
See Chromeleon software, 1-1
See PeakNet 6 software, 1-1
Software control of GS50, 2-21
Solenoid valve connections, 2-10, B-5
Spare parts, E-1
Specifications
Display and keypad, A-1
Electrical, A-1
Environmental, A-1
Gradient control, A-3
Hydraulic, A-2
Physical, A-1
Vacuum degas assembly, A-3
SRS
Automatic shutoff, B-15, C-12
Power control, 4-13
Standard delay volume, 1-2, 5-15, A-2
Conversion procedure, 5-15 – 5-16
Gradient mixer, 2-14
Step gradient change, 2-24
Pressure fluctuations, 4-1
Pump does not start, 4-3
Pump is out of prime, 4-1 – 4-2
Pump motor is noisy, 4-9
Pump stops unexpectedly, 4-4
Relay controls are inoperative, 4-12
TTL2 output is inoperative, 4-13
TTL input operation
Functions controlled, D-3
Method clock control, D-3
TTL/Relay control, 1-1, 2-19, 2-21, D-1
Connectors, 2-11
Does not operate, 4-12
Example connections, D-6
Input operation, D-3
Input signal modes, D-3
Installation, D-5
Output operation, D-2
Setting outputs, C-5, C-8
TTL2 output is inoperative, 4-13
TTL2 output usage, B-15, C-12
U
Usage Log screen, C-17
User interface
See Display screens
T
Technical Support, 4-1, 5-1
Tests
Electronics components, C-18
Operating pressure, 2-11
Pressure transducer, C-16
Time
Setting the method clock, 3-14
Time Function In screen, C-13, D-3
Troubleshooting, 4-1
Chromatographic reproducibility, 4-13
Degas assembly calibration fails, 4-11
Degas assembly low vacuum, 4-12
Leak alarm, 4-7 – 4-8
Liquid leaks, 4-7 – 4-8
Index-8
V
VAC PUMP connector, 4-11
Vacuum degas assembly, 1-1, 2-16
Components, 2-16
Daily maintenance, 3-23
Daily shutdown, 3-25
Electrical connections, 4-11
Priming, B-12 – B-13
See also Degas pump, 1-1
Specifications, A-3
Valves
Check valve service procedures, 5-1
See also Valve type
Doc. 031612-03 10/03
Index
Waste valve, 2-13
Waste valve location, 2-13
Voltage selection, B-3
W
Warning icon, 1-4 – 1-5
Warranty, voiding, 5-1
Waste lines, B-7
Waste valve, 2-13
Leakage from knob, 4-8
Opening, 2-13
O-ring replacement procedure, 5-11
Waste line, B-7
Weekly maintenance, 3-24
Y
Yearly maintenance, 3-24
Doc. 031612-03 10/03
Index-9
GS50 Gradient Pump
Index-10
Doc. 031612-03 10/03
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