Teledyne 2120XL Operating instructions

OPERATING INSTRUCTIONS FOR
Model 2120XL
Trace Nitrogen in Argon Analyzer
P/N M84744
10-01-14
DANGER
This instrument is for analyzing nitrogen in argon only.
Do not introduce any flammable or toxic gases into this instrument.
Hazardous voltages exist on certain components internally which may be
lethal. Disconnect power before servicing.
Only authorized personnel should conduct maintenance and/or servicing.
Before conducting any maintenance or servicing, consult with authorized
supervisor/manager.
Teledyne Analytical Instruments
Model 2120XL
Copyright © 2014 Teledyne Analytical Instruments
All Rights Reserved. No part of this manual may be reproduced, transmitted, transcribed,
stored in a retrieval system, or translated into any other language or computer language in
whole or in part, in any form or by any means, whether it be electronic, mechanical,
magnetic, optical, manual, or otherwise, without the prior written consent of Teledyne
Analytical Instruments, 16830 Chestnut Street, City of Industry, CA 91748.
Warranty
This equipment is sold subject to the mutual agreement that it is warranted by us free from
defects of material and of construction, and that our liability shall be limited to replacing or
repairing at our factory (without charge, except for transportation), or at customer plant at
our option, any material or construction in which defects become apparent within one year
from the date of shipment, except in cases where quotations or acknowledgements provide
for a shorter period. Components manufactured by others bear the warranty of their
manufacturer. This warranty does not cover defects caused by wear, accident, misuse,
neglect or repairs other than those performed by Teledyne or an authorized service center.
We assume no liability for direct or indirect damages of any kind and the purchaser by the
acceptance of the equipment will assume all liability for any damage which may result from
its use or misuse.
We reserve the right to employ any suitable material in the manufacture of our apparatus,
and to make any alterations in the dimensions, shape or weight of any parts, in so far as
such alterations do not adversely affect our warranty.
Important Notice
This instrument provides measurement readings to its user, and serves as a tool by which
valuable data can be gathered. The information provided by the instrument may assist the user
in eliminating potential hazards caused by his process; however, it is essential that all
personnel involved in the use of the instrument or its interface, with the process being
measured, be properly trained in the process itself, as well as all instrumentation related to it.
The safety of personnel is ultimately the responsibility of those who control process
conditions. While this instrument may be able to provide early warning of imminent
danger, it has no control over process conditions, and it can be misused. In particular, any
alarm or control systems installed must be tested and understood, both as to how they
operate and as to how they can be defeated. Any safeguards required such as locks, labels,
or redundancy, must be provided by the user or specifically requested of Teledyne at the
time the order is placed.
Therefore, the purchaser must be aware of the hazardous process conditions. The purchaser
is responsible for the training of personnel, for providing hazard warning methods and
instrumentation per the appropriate standards, and for ensuring that hazard warning devices
and instrumentation are maintained and operated properly.
Teledyne Analytical Instruments, the manufacturer of this instrument, cannot accept
responsibility for conditions beyond its knowledge and control. No statement expressed or
implied by this document or any information disseminated by the manufacturer or its
agents, is to be construed as a warranty of adequate safety control under the user’s process
conditions.
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Trace Nitrogen in Argon Analyzer
Specific Model Information
This instrument relies on the known spectrum emitted from a
plasma discharge from a distinct gas mixture of variable composition at
or near atmospheric pressure. This instrument cannot be used for
analysis on any gas or gas mixture other than nitrogen in argon or a
mixture specified at the time of purchase. Specific filters carefully
chosen and tested at the factory have been installed for the particular gas
mixture. Using this instrument to analyze any other gas mixture will
result in serious error. Consult the factory for additional information for
gas analysis not specified at the time of purchase.
Instrument Serial Number: _______________________

Instrument Range: _______________

Calibrated for:

Background Gas: _______________

Zero Gas:
_______________

Span Gas:
_______________
_______________
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Model 2120XL
Safety Messages
Your safety and the safety of others is very important. We have
provided many important safety messages in this manual. Please read
these messages carefully.
A safety message alerts you to potential hazards that could hurt you
or others. Each safety message is associated with a safety alert symbol.
These symbols are found in the manual and inside the instrument. The
definition of these symbols is described below:
GENERAL WARNING/CAUTION: Refer to the instructions for
details on the specific danger. These cautions warn
of specific procedures which if not followed could
cause bodily Injury and/or damage the instrument.
CAUTION: HOT SURFACE WARNING: This warning is specific to
heated components within the instrument. Failure to
heed the warning could result in serious burns to
skin and underlying tissue.
WARNING: ELECTRICAL SHOCK HAZARD: Dangerous voltages appear
within this instrument. This warning is specific to
an electrical hazard existing at or nearby the
component or procedure under discussion. Failure
to heed this warning could result in injury and/or
death from electrocution.
Technician Symbol: All operations marked with this symbol are to be
performed by qualified maintenance personnel only.
NOTE:
No
Symbol
Additional information and comments regarding a
specific component or procedure are highlighted in
the form of a note.
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Trace Nitrogen in Argon Analyzer
CAUTION:
THE ANALYZER SHOULD ONLY BE USED ONLY
FOR THE PURPOSE AND IN THE MANNER
DESCRIBED IN THIS MANUAL.
IF YOU USE THE ANALYZER IN A MANNER OTHER
THAN THAT FOR WHICH IT WAS INTENDED,
UNPREDICTABLE BEHAVIOR COULD RESULT
POSSIBLY ACCOMPANIED WITH HAZARDOUS
CONSEQUENCES.
This manual provides information designed to guide you through
the installation, calibration operation and maintenance of your new
analyzer. Please read this manual and keep it available.
Occasionally, some instruments are customized for a particular
application or features and/or options added per customer requests.
Please check the front of this manual for any additional information in
the form of an Addendum which discusses specific information,
procedures, cautions and warnings that may be peculiar to your
instrument.
Manuals do get lost. Additional manuals can be obtained from
Teledyne at the address given in the Appendix. Some of our manuals are
available in electronic form via the internet. Please visit our website at:
www.teledyne-ai.com.
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Model 2120XL
Table of Contents
List of Figures ................................................................ ix
List of Tables .................................................................. x
Introduction..................................................................... 1
1.1 Overview
1.2 Typical Applications
1.3 Features
1.4 Front Panel
1.5 Rear Panel
1.6 Internal Components
1.7 Additional Safety Information
1.7.1 Detector Cautions
1.7.2 Basic Safety Requirements
1.7.3 Precautionary Labels
1.7.4 Summary of Known Hazards
1.7.4.1 Electrocution
1.7.4.2 Pressure
1.7.4.3 Purging
1.7.4.4 Safe Repair Procedures
1.7.4.5 General Precautions for Handling and Storing
High Pressure Gas Cylinders
1
1
2
3
5
6
7
8
9
9
10
10
10
11
11
11
Operational Theory ....................................................... 13
2.1 The Analyzer
2.2 Sample System
13
14
Installation..................................................................... 17
3.1 Unpacking the Instrument
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Trace Nitrogen in Argon Analyzer
3.2 Choosing a Location
3.3 Mounting
3.4 Rear Panel Connections
3.5 Electrical Connections
3.5.1 Primary Input Power
3.5.2 50-Pin Equipment Interface Connector
3.5.3 RS-232 Port
3.6 Gas Connections
3.6.1 Typical Sample System
3.6.2 Gas Connections to the Instrument
3.7 Purging
3.8 Calibration
3.9 Installation Checklist
18
18
19
20
20
20
26
27
29
31
31
33
33
Operation....................................................................... 35
4.1 Powering Up the Analyzer
4.2 Zero and Span Calibration
4.3 Setup and Operation General Information
4.4 Using the Data Entry and Function Buttons
4.5 Analyzer Functions
4.5.1 System Menu
4.5.1.1 Digital Filter
4.5.1.2 Self-Test
4.5.1.3 Password Protection
4.5.1.4 Logout
4.5.1.5 ERR
4.5.1.6 Auto Calibration (Auto Cal)
4.5.1.7 Flow
4.5.1.8 Tracking During Calibration
4.5.1.9 Calibration Hold Timer (Calholdtimer)
4.5.1.10 The Model Screen
4.5.1.11 Analog Output Calibration (Out_Cal)
4.5.1.12 Linearize (Lin)
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38
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40
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42
46
46
47
49
49
50
50
51
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Model 2120XL
4.5.2 The Zero and Span Functions
4.5.2.1 Before Calibration
4.5.2.2 Recommended Calibration Gases
4.5.2.3 Zero Cal
4.5.2.4 Span Calibration
4.5.3 The Range Function
4.5.4 The Alarms Function
4.6 The Analyze Function
4.7 Signal Output
54
54
55
55
57
59
60
62
62
Maintenance .................................................................. 65
5.1 Routine Maintenance
5.2 Routine Maintenance Schedule
5.3 Fuse Replacement
5.4 System Self Diagnostic Test
5.5 Error Screens
5.6 Sensor Replacement
65
65
66
67
68
69
Appendix ....................................................................... 71
A.1 Specifications
A.2 Recommended Replacement Parts List
A.3 Drawing List
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Trace Nitrogen in Argon Analyzer
List of Figures
Figure 1-1 Model 2120XL Front Panel
Figure 1-2: Model 2120XL Rear Panel
Figure 1-3: Internal Component Identification
Figure 3-1: Required Front Door Clearance
Figure 3-2: Rear Panel of the Model 2120XL
Figure 3-3: Equipment Interface Connector Pin Arrangement
Figure 3-4: Remote Valve Connections
Figure 3-5: FET Series Resistance
Figure 3-6: Suggested Sample System
Figure 4-1: Hierarchy of Functions and Sub Functions
Figure 5-1: Removing Fuse Block from Housing
Figure 5-2: Installing Fuses
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6
7
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19
21
25
26
29
39
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Model 2120XL
List of Tables
Table 3-1: Analog Output Connections
Table 3-2: Alarm Relay Contact Pins
Table 3-3: Remote Calibration Connections
Table 3-4: Range ID Relay Connections
Table 3-5: Commands via RS-232 Input
Table 3-6: Required RS-232 Options
Table 5-1: Routine Maintenance Schedule
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23
24
26
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Trace Nitrogen in Argon Analyzer
DANGER
COMBUSTIBLE GAS USAGE
WARNING
This is a general purpose instrument designed for use in a
non-hazardous area. It is the customer's responsibility to
ensure safety especially when combustible gases are
present since the potential of gas leaks always exist.
Never introduce gases other than argon into the analyzer. If
explosive, flammable or corrosive gases or gas mixtures are
allowed to flow into the analyzer, fire or explosion can result.
Sample gas introduced must be at or very close to
atmospheric pressure or damage to the detector will result.
To avoid serious injury, read all precautionary labels
attached to equipment, cylinders, containers, and boxes
prior to start-up.
Labels attached in appropriate areas of the analyzer warn
you of inherent hazards associated with the system. For
personal safety, read the labels and perform directed
precautions before handling the equipment.
The customer should ensure that the principles of operating
this equipment are well understood by the user. Misuse of
this product in any manner, tampering with its components,
or unauthorized substitution of any component may
adversely affect the safety of this instrument.
Since the use of this instrument is beyond the control of
Teledyne Analytical Instruments, referred as TAI, no
responsibility by TAI, its affiliates, and agents for damage or
injury from misuse or neglect of this equipment is implied or
assumed.
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Model 2120XL
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Trace Nitrogen in Argon Analyzer
Introduction
Introduction
1.1 Overview
This manual describes installation, operation and maintenance for
the Model 2120XL Trace Nitrogen in Argon Gas Analyzer. Section 1
describes the analyzer in general terms and provides additional safety
information pertinent to the proper operation of the instrument.
The Teledyne Model 2120XL Trace Nitrogen in Argon Gas
Analyzer is a robust analytical tool for measuring trace amounts of
nitrogen in argon. Using precise optical filtering, single line emission
characteristic of nitrogen is produced with an intensity proportional to
the nitrogen concentration.
The Model 2120XL has three user programmable analysis ranges
extending from 0-1 ppm to 0-100 ppm with corresponding analog output
signals that are proportional to the concentration on the selected range.
The nitrogen concentration is displayed on the front panel and the
analog output signals are available at the rear panel. Digital
communication is achieved with a standard RS-232 serial port.
The system is easy to operate with all controls and indicators
accessible from the front panel. Digital flow control, two adjustable
concentration alarms, system alarm, self-diagnostics are just a few of the
many features included on the standard Model 2120XL instrument.
1.2 Typical Applications
The Model 2120XL Trace Nitrogen in Argon Gas Analyzer is used
in a wide range of applications including:

Air separation plants

Argon Purification Plants

Specialty Gas Laboratories

Specialty Steel Manufacturing

Gas Management/Monitoring Systems
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Model 2120XL

Quality Control for Truck Fills & Gas Cylinders

Process Control

New Line Certification

Chemical Plants

Welding Gas Management

Semiconductor Manufacturing
1.3 Features
The Model 2120XL comes equipped with the following standard
features:

A 2-line alphanumeric vacuum fluorescent display (VFD)
screen, driven by microprocessor electronics that
continuously prompts and informs the operator.

High resolution, accurate readings of nitrogen content from
low ppm levels through 100 ppm in argon. Large, bright,
meter readout.

Advanced high frequency plasma generator produces stable
electroluminescent discharge with minimal heating yielding a
spectral emission characteristic of the gas mixture.

Custom low-noise optical filter for precise narrow band
selection and low optical interference.

Amplified optics circuit for stable nitrogen detection at low
ppb level.

Microprocessor based electronics: 8-bit CMOS
microprocessor with 32 kB RAM and 128 kB ROM.

Three user definable output ranges (from 0-1 ppm through 0100 ppm) allow best match to users process and equipment.

Auto Ranging allows analyzer to automatically select the
proper preset range for a given measurement. Manual
override allows the user to lock onto a specific range of
interest.

Two adjustable concentration alarms and a system failure
alarm.
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Introduction

Extensive self-diagnostic testing, at startup and on demand,
with continuous power-supply monitoring.

Two way RFI protection.

RS-232 serial digital port for use with a computer or other
digital communication device.

Four analog outputs: two for measurement (0–1 VDC and
isolated 4–20 mA DC) and two for range identification.

Convenient and versatile, steel, flush-panel or rackmountable case with slide-out electronics drawer.
1.4 Front Panel
Operator controls and displays are located on the front panel as
shown in Figure 1-1.
Figure 1-1 Model 2120XL Front Panel
The standard 2120XL Nitrogen in Argon Analyzer is panel
mounted designed for easy installation in a standard 19” instrument
rack. All user controls and displays accessible from the front panel.
The front panel has thirteen buttons for operating the analyzer, a
digital meter, and an alphanumeric vacuum fluorescent (VFD) display.
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Introduction
Model 2120XL
Function Keys:
Six touch-sensitive membrane switches are used to change the specific
function performed by the analyzer:
Analyze
Perform analysis for nitrogen content in an argon
gas mixture.
System
Perform system-related tasks (described in detail
in Chapter 4, Operation.).
Span
Span calibrate the analyzer.
Zero
Zero calibrate the analyzer.
Alarms
Set the alarm setpoints and attributes.
Range
Set up the 3 user definable ranges for the
instrument.
Data Entry Keys:
Six touch-sensitive membrane switches are used to input data to the
instrument via the alphanumeric VFD display:
◄►
Select between functions currently displayed on
the VFD screen.
▲▼
Increment or decrement values of functions
currently displayed.
Enter
Advances VFD display to the next screen in a
series or returns to the Analyze screen if none
remain.
Escape
Backs VFD display to the previous screen in a
series or returns to the Analyze screen if none
remain also used to abort an entry.
Digital Meter Display:
The meter display is a Light Emitting Diode (LED) device that produces
large, bright, 7-segment numbers that are legible in any lighting. It
produces a continuous readout from 0-10,000 ppm. It is accurate across
all analysis ranges without the discontinuity inherent in analog range
switching.
Alphanumeric Interface Screen:
The VFD screen is an easy-to-use interface from operator to analyzer. It
displays values, options, and messages that give the operator immediate
feedback.
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Trace Nitrogen in Argon Analyzer
Introduction
Standby Button:
The Standby turns off the display and outputs, but circuitry is still
operating.
CAUTION:
THE POWER CABLE MUST BE UNPLUGGED TO
FULLY DISCONNECT POWER FROM THE
INSTRUMENT. WHEN CHASSIS IS EXPOSED OR
WHEN ACCESS DOOR IS OPEN AND POWER
CABLE IS CONNECTED, USE EXTRA CARE TO
AVOID CONTACT WITH LIVE ELECTRICAL CIRCUITS
.
Access Door:
For access to internal components of the analyzer, the front panel swings
open when the latch in the upper right corner of the panel is pressed all
the way in with a narrow gauge tool. Accessing the main circuit board
requires unfastening rear panel screws and sliding the unit out of the
case.
1.5 Rear Panel
The rear panel, shown in Figure 1-2, contains the gas and electrical
connectors for external inlets and outlets. Some of those depicted are
optional and may not appear on your instrument. The connectors are
described briefly here and in detail in Chapter 3 Installation.
Power Connection
Universal AC power source.
Digital I/O
Analog Outputs:
0–1 VDC nitrogen concentration
plus 0-1 VDC range ID, and
isolated 4–20 mA DC nitrogen
concentration plus 4-20 mA DC
range ID.
Alarm Signals:
2 concentration alarms and 1
system alarm.
Remote Span/Zero
Digital inputs allow external
control of analyzer calibration.
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Introduction
Model 2120XL
Calibration Contact
Notifies external equipment that
instrument is being calibrated and
readings are not monitoring
sample.
Range ID Contacts
Four separate, dedicated, range
relay contacts. Low, Medium,
High, Cal (not used).
RS-232 Port
Serial digital concentration signal
output and control input.
Gas Inlet and Outlet
One inlet and one vent.
Purge Connections
Inlet and outlet connections for
purging the analyzer.
Instrument Air
Used for driving optional auto
calibration valves.
Figure 1-2: Model 2120XL Rear Panel
1.6 Internal Components
The internal components can be accessed by removing the top
cover of the analyzer. Figure 1-3 shows an inside view of the analyzer
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Trace Nitrogen in Argon Analyzer
Introduction
and identifies specific components of the analyzer. See also Figure 1-4
for internal components inside the card cage.
Figure 1-3: Internal Component Identification
WARNING:
HIGH VOLTAGE. ELECTROCUTION HAZARD.
UNPLUG THE ANALYZER BEFORE REMOVING THE
COVER. THE OUTPUT OF THE HIGH-VOLTAGE
TRANSFORMER AND THE ANALYTICAL CELL
ELECTRODES CAN APPROACH VOLTAGES OF
10,000 VAC. THE ANALYZER SHOULD BE SERVICED
ONLY BY A QUALIFIED SERVICE TECHNICIAN.
1.7 Additional Safety Information
Note: The material provided in this section contains information
to promote safety in the operation and maintenance of this
equipment. It is not intended to supersede, replicate, or
replace any safety documentation or procedures provided
from or established by official safety sources.
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Introduction
Model 2120XL
Do NOT operate the Model 2120XL Trace Nitrogen in Argon
Gas Analyzer until you read and understand the operating,
maintenance, and safety instructions included in this
manual.
Anyone involved with the operation of this equipment
including plant engineering, operations, and management, must
understand the potential hazards involved, and know and observe all
required safety precautions.
Your safety and the safety of equipment, nearby facilities, and
personnel require a proper safety attitude and emphasis on safe work
procedures. This is the essence of any good safety program. If at any
time you identify safety deficiencies, immediately correct them and
bring them to the attention of management.
Before an accident can be prevented, it must be anticipated. Use
pre-job discussions with your coworkers and supervisors to identify
hazards and the means to avoid them. At your facility, various gases
may exist in liquid and/or gaseous states. Familiarize yourself with the
hazards associated with each gas found at your facility.
Read and understand the Material Safety Data Sheets (MSDS) for
the materials used with this equipment. All personnel who work in the
vicinity of this equipment should read, understand, and follow all safety
information contained in the MSDSs, in addition to following all
government and facility safety regulations.
CAUTION:
NEVER INTRODUCE GASES OTHER THAN ARGON
INTO THE ANALYZER. IF EXPLOSIVE, FLAMMABLE,
OR CORROSIVE GASES OR GAS MIXTURES ARE
ALLOWED TO FLOW INTO THE ANALYZER, FIRE OR
EXPLOSION CAN RESULT. THIS ANALYZER IS NOT
DESIGNED TO BE USED IN HAZARDOUS AREAS.
1.7.1 Detector Cautions
The Model 2120XL uses a detection technique based on
spectroscopic emission. The detector is a thin-walled pure quartz cell
located in an electromagnetic field created by a specific high intensity
plasma generator. This electromagnetic field creates a plasma that emits
light at different wavelengths. A filter for the nitrogen is used to avoid
any interference and get the best performance.
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Trace Nitrogen in Argon Analyzer
Introduction
Since the cell is made of thin quartz, this analyzer must be used at
atmospheric pressure to avoid cell damage. Any back pressure in the
detector will cause damage and require replacement of the module.
Make sure the vent is at atmospheric pressure and without
restrictions or blockage.
1.7.2 Basic Safety Requirements
The following safety guidelines apply at all times when working
with the Model 2120XL analyzer:

Prevent electrical shock — Unplug and remove the AC
power cord from the rear panel before opening and working on
the analyzer. Use tools designed for work on electrical
equipment.

Prevent injury — Always wear safety glasses and appropriate
safety protection. Ensure that all tools and instruments used
during installation and maintenance are in good condition. Be
aware that high-velocity gas may be released at vents and safety
relief valves.

Follow posted precautions — Read all precautionary labels
attached to the equipment. Be sure to read all cylinder labels and
warnings. Comply with all precautions before handling the
equipment.
Situations may develop for which no written procedures exist.
Think carefully before acting. Know the function of each valve and
switch, and its effect on the equipment. Carefully review all operating
procedures before starting up this equipment to ensure knowledge and
understanding.
1.7.3 Precautionary Labels
WARNING:
TO AVOID SERIOUS INJURY, READ ALL CAUTION
LABELS ATTACHED TO EQUIPMENT, CYLINDERS,
CONTAINERS, AND BOXES PRIOR TO START-UP.
Labels attached in appropriate areas of the analyzer warn you of
inherent hazards associated with the system. For personal safety, read
the labels and perform directed instructions before handling the
equipment.
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Introduction
Model 2120XL
1.7.4 Summary of Known Hazards
This equipment is designed to minimize your exposure to the process
gases and other known hazards. Read and thoroughly understand all
safety aspects of this system and its operation before operating or
maintaining the equipment.
1.7.4.1 ELECTROCUTION
WARNING:
DO NOT OPERATE THE ANALYZER WITHOUT THE
COVER SECURED IN PLACE. THE OUTPUT OF THE
HIGH-VOLTAGE TRANSFORMER AND THE
ANALYTICAL CELL ELECTRODES CAN APPROACH
VOLTAGES OF 6,000 VAC OR HIGHER. TO GUARD
AGAINST ELECTRICAL SHOCK AND POSSIBLE
ELECTROCUTION, THE ANALYZER SHOULD BE
SERVICED ONLY BY A QUALIFIED SERVICE
TECHNICIAN.
Adherence to the following guidelines helps guard against electrical
shock:

For safety and proper performance, this analyzer must be
connected to a properly grounded three-wire source of
electrical power.

Tampering or unauthorized substitution of components may
adversely affect the safety of this instrument. Use only
factory-approved components for repair.

Before checking or replacing any chassis component, turn off
the power and remove the AC power cord from the rear
panel.
1.7.4.2 PRESSURE
WARNING:
MISHANDLING OF GAS CYLINDERS COULD
RESULT IN DEATH, SERIOUS INJURY, OR
PROPERTY DAMAGE. HANDLE AND STORE GAS
CYLINDERS WITH EXTREME CARE AND IN
ACCORDANCE WITH MANUFACTURER'S
INSTRUCTIONS.
Sudden or uncontrolled release of pressurized gas can cause serious
injury. The hazards of high pressure can be avoided through careful
inspection and handling of cylinders and equipment with proper
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Trace Nitrogen in Argon Analyzer
Introduction
regulation. Read and understand the MSDSs for the process gases used
before operating this analyzer. More detailed information on the
precautions and safe practices to follow when handling cylinders can be
found in the CGA pamphlet P-1, Safe Handling of Compressed Gases in
Cylinders.
1.7.4.3 PURGING
CAUTION:
EQUIPMENT DAMAGE MAY RESULT IF THE
ANALYTICAL CELL IN THIS UNIT IS EXPOSED TO
PRESSURE ABOVE ATMOSPHERIC PRESSURE.
THE CELL MAY BREAK OR SHATTER. TO PREVENT
THIS, ALWAYS KEEP THE VENT AT ATMOSPHERIC
PRESSURE.
DO NOT EXCEED 20 PSIG (138 KPA) AT THE
SAMPLE INLET.
DO NOT BLOCK THE VENT.
Follow applicable safety precautions to ensure that an oxygendeficient atmosphere is not created in the work area. Use low parts per
million (ppm) nitrogen in argon gas with proper regulation to avoid
contaminating the sampling system.
1.7.4.4 SAFE REPAIR PROCEDURES
Any repair work must be performed by a qualified service
technician. Use only factory-approved components for repair.
Analyzer manifold purging as well as subsequent repair work must
be performed by experienced personnel.
Ventilate working area to prevent any leaking supply gas from
accumulating. Vent all gases to the outside.
Vent all pressure relief valves out of enclosed areas. Piping must be
properly sized to allow safety devices to operate according to
specifications.
De-pressurize supply gas piping before working on it.
1.7.4.5 GENERAL PRECAUTIONS FOR HANDLING AND STORING HIGH
PRESSURE GAS CYLINDERS
Compressed gases have properties that can cause serious accidents,
injuries, and even death if proper precautions and safety practices are
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Introduction
Model 2120XL
not followed. Therefore, during handling and use of these gases, be
certain to use applicable safety precautions described by your local
compressed gas supplier, the Compressed Gas Association, and/or
OSHA regulations.
1. Read the label on all cylinders BEFORE using to identify
the cylinder contents. If the label is illegible, return the
cylinder to the supplier. DO NOT ASSUME THE
CONTENTS.
2. Secure cylinders in storage and in use to an immovable
structure to prevent accidental falling or movement. Read
the relevant safety codes.
3. Store or move cylinders ONLY in the vertical position. DO
NOT move or transport cylinders with regulators attached.
4. Store cylinders in a well ventilated area away from heat or
ignition sources.
5. When installing tubing, provide ONLY approved, adequate
pressure reducing regulators and pressure relief devices to
prevent over-pressurizing of tubing and equipment.
6. Never drop cylinders or permit them to strike each other
violently.
7. Cylinders may be stored in the open but, in such cases,
should be protected against extremes of weather and from
damp ground (to prevent rusting) in areas where extreme
temperatures are prevalent, store cylinders in the shade.
8. The valve protection cap should be left on each cylinder
until cylinder has been secured against a wall or bench, or
placed in a cylinder stand and is ready for use.
9. Avoid dragging, rolling or sliding cylinders even for a short
distance. Move cylinders by using a suitable hand truck.
10. Never tamper with safety devices in valves or cylinders.
11. Do not store full and empty cylinders together. Serious
suck-back can occur when an empty cylinder is attached to a
pressurized system.
12. No part of a cylinder should be subjected to a temperature
higher than 52°C (125°F). Do not permit flame to come in
contact with any part of a compressed gas cylinder.
Teledyne Analytical Instruments
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Trace Nitrogen in Argon Analyzer
Operational Theory
Operational Theory
2.1 The Analyzer
The Model 2120XL Trace Nitrogen in Argon Gas Analyzer is a
rack mounting self-contained unit for measuring trace amounts of
nitrogen in an argon gas stream.
A customer supplied sample system directs a stream of refined
argon to the instrument at a pressure between 4 and 20 psig (14-138
kPa). The process stream enters at a constant flow rate and passes
through a flow module containing a flow control valve and a mass flow
transducer. A gas conditioning unit is installed to remove particulates
from the incoming gas sample.
The gas is then fed to a quartz analytical cell where it is ionized in a
plasma discharge. The high energy within the plasma results in constant
collisions of ions and electrons and yields a characteristic emission
spectra intimately associated with the gas comprising the plasma.
The specific line energy is identified for nitrogen and a custom
blocking filter is selectively chosen and installed at the factory which is
tuned to remove all but the narrow energy associated with the nitrogen
emission peak. The light energy passing through the filter is focused on
a photon detector also tuned to respond to that wavelength. This
instrument can only be used for analyzing nitrogen in argon.
The photodetector produces a signal which is integrated and then
amplified. The resulting signal is digitized and processed by a
microprocessor and signal processing circuit. The results are displayed
on the instrument display as parts per million (ppm). An additional
digital to analog circuit transforms the signal back to analog form and
produces an output signal, typically 4-20 mA DC that is proportional to
the nitrogen concentration on the selected range.
The microprocessor circuit accepts input from the mass flow
transducer as well as the user interface. The analyzer software interprets
operator key presses and initiates the appropriate action as well as
sending signals to the displays for prompting the user for input or data
display.
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Operational Theory
Model 2120XL
After analysis, the gas is returned to the gas flow module. A signal
is produced in the flow transducer that is used by the microprocessor to
control the flow control valve. From the flow control module, the gas
exits the analyzer at atmospheric pressure.
The superior accuracy of the Model 2120XL is achieved through
enhanced coupling of the plasma to the process and an advanced plasma
generator design. Through proper frequency and intensity control a
uniform, precisely located, and highly stable plasma discharge is
produced with minimum heat generation. The resulting emission spectra
is clear and distinct.
The Model 2120XL is fitted with custom optical filtering and an
optics system that is specifically designed to reduce interference. The
desired spectral line used for analysis is sharp and focused on the
detector.
The detector lifetime is enhanced using a “Duty Cycle Controlled
System” by reducing the coating inside the cell. This also results in an
increase in sensitivity.
2.2 Sample System
A suitable external sample system must be provided by the
customer. The external sample system delivers calibration or sample gas
to the analyzer at a suitable pressure.
The sample system may contain a molecular sieve type trap to
reduce moisture levels in the sample gas. Moisture produces a wellknown interference line in the spectrum close to that of nitrogen. It is
necessary to use moisture-free sample gas or install an efficient moisture
trap on the inlet.
Internally the Model 2120XL employs a flow control valve which
provides proper flow through the analyzer when the inlet pressure is
maintained between 4 to 20 psig. The proper flow rate should be
maintained around 100 ccm.
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Trace Nitrogen in Argon Analyzer
CAUTION:
Operational Theory
IT IS THE RESPONSIBILITY OF THE END USER TO
PROVIDE A SUITABLE SAMPLE SYSTEM CAPABLE OF
DELIVERING CLEAN, PARTICULATE-FREE ARGON
THAT IS AIR AND MOISTURE FREE.
EQUIPMENT DAMAGE MAY RESULT IF THE
ANALYTICAL CELL IN THIS UNIT IS EXPOSED TO
PRESSURE, CAUSING IT TO BREAK OR SHATTER.
TO PREVENT THIS, NEVER EXCEED 20 PSIG (138
KPA) ON THE INPUT PORT AND ALWAYS MAINTAIN
THE VENT AT ATMOSPHERIC PRESSURE.
DO NOT BLOCK THE VENT.
The external sample system should be capable of supplying clean,
particulate-free and moisture-free sample gas that is also free of air and
moisture. If air or moisture is ionized in the analytical cell, ozone
emissions are possible. These same conditions apply to any calibration
gases used.
Section 3.6.1 provides more information on a suitable sample
system.
If air enters the sample system, it can be removed by purging the
sample lines. Recalibration is not necessary.
Teledyne Analytical Instruments
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Operational Theory
Teledyne Analytical Instruments
Model 2120XL
16
Trace Nitrogen in Argon Analyzer
Installation
Installation
Installation of the Model 2120XL Trace Nitrogen in Argon
Analyzer can involve potentially hazardous procedures.
CAUTION:
INSTALLATION SHOULD BE PERFORMED ONLY BY
TRAINED AND QUALIFIED PERSONNEL WHO HAVE
READ AND UNDERSTOOD THE INSTRUCTIONS IN
THIS MANUAL.
Installation of the Model 2120XL Trace Nitrogen in Argon
Analyzer includes:

Unpacking

Choosing an Appropriate Location

Mounting

Electrical connections

Gas connections

Purging

Calibration
3.1 Unpacking the Instrument
The analyzer is shipped with all the materials you need to install
and prepare the system for operation. Carefully remove the analyzer from
the shipping container and visually inspect it for damage. Maintain it in an
upright position and avoid jarring. Ensure the power cord and calibration
data sheets are included and that all components ordered have been
supplied. Remove any plugs that may be installed on the gas tube fittings
on the rear panel.
If any items are missing or the analyzer appears damaged,
immediately report any damage to the shipping agent and notify
Teledyne. Remove and discard caps from fittings; inspect the analyzer
for loose fittings or connections.
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Installation
Model 2120XL
3.2 Choosing a Location
Locate the Model 2120XL in a clean area free of:

Excessive dust

Mechanical vibrations

Strong electric or electromagnetic fields

Corrosive gases

Moisture exceeding 90% relative humidity

The use of walkie-talkies or cellular phones
Choose a location where sudden temperature changes in excess of
5°F (5°C) do not occur and where the temperature does not exceed the
specified ambient temperature range. Avoid any location where the
instrument would be exposed to direct sunlight or radiation from heaters.
CAUTION:
THIS ANALYZER IS DESIGNED FOR USE IN A
GENERAL PURPOSE AREA AND IS NOT RATED
FOR USE IN HAZARDOUS AREAS.
3.3 Mounting
The Model 2120XL is a rack mountable unit intended for indoor
use only. Space and materials required for mounting are:

8-3/4-inches (22.2 cm) of 19-inch rack space.

Service access space behind and in front of the analyzer.

Four mounting screws suited to the rack.
All operator controls are mounted on the control panel, which is
hinged on the left edge and doubles as the door that provides access to
components inside the controller module. The door latch is spring
loaded and will swing open when the button in the center of the latch
(upper right corner) is pressed all the way in with a narrow gauge tool
(less than 0.18 inch wide). Allow clearance for the door to open in a
90-degree arc of radius 7.125 inches. See Figure 3-1.
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Trace Nitrogen in Argon Analyzer
Installation
Figure 3-1: Required Front Door Clearance
3.4 Rear Panel Connections
Figure 3-2 shows the Model 2120XL rear panel. Up to 7 gas inlet
and outlet ports are installed depending on whether the unit is supplied
with an optional auto calibration module. In addition, the rear panel has
provisions for power, communication, and a user interface connector
that incorporates alarm, analog output, digital input/output, and relay
connections that are used in interfacing peripheral equipment with the
analyzer.
Figure 3-2: Rear Panel of the Model 2120XL
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Installation
Model 2120XL
3.5 Electrical Connections
Electrical Connections are made at the rear of the instrument. See
Figure 3-2.
For safe connections, no uninsulated wiring should be able to come
in contact with fingers, tools or clothing during normal operation.
CAUTION:
USE SHIELDED CABLES. ALSO, USE PLUGS THAT
PROVIDE EXCELLENT EMI/RFI PROTECTION. THE
PLUG CASE MUST BE CONNECTED TO THE CABLE
SHIELD, AND IT MUST BE TIGHTLY FASTENED TO
THE ANALYZER WITH ITS FASTENING SCREWS.
ULTIMATELY, IT IS THE INSTALLER WHO ENSURES
THAT THE CONNECTIONS PROVIDE ADEQUATE
EMI/RFI SIELDING.
3.5.1 Primary Input Power
The power cord receptacle and fuse block are located in the same
assembly. Insert the power cord into the power cord receptacle.
CAUTION:
POWER IS APPLIED TO THE INSTRUMENT'S
CIRCUITRY AS LONG AS THE INSTRUMENT IS
CONNECTED TO THE POWER SOURCE.
THESTANDBY SWITCH ON THE FRONT PANEL IS
FOR SWITCHING POWER ON OR OFF TO THE
DISPLAYS AND OUTPUTS ONLY.
The universal power supply requires an 85–250 VAC, 47-63 Hz
power source.
Fuse Installation: The fuse block, at the right of the power cord
receptacle, accepts US or European size fuses. A jumper replaces the
fuse in whichever fuse receptacle is not used. Fuses are not installed at
the factory. Be sure to install the proper fuse as part of installation. (See
Fuse Replacement in Chapter 5, Maintenance.)
3.5.2 50-Pin Equipment Interface Connector
Figure 3-3 shows the pin layout of the Equipment Interface
Connector. The arrangement is shown as seen when the viewer faces the
rear panel of the analyzer. The pin numbers for each input/output
function are given where each function is described in the paragraphs
below.
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Trace Nitrogen in Argon Analyzer
Installation
Figure 3-3: Equipment Interface Connector Pin Arrangement
Analog Outputs: There are four DC output signal pins—two pins per
output. For polarity, see Table 3-1. The outputs are:
0–1 VDC % of Range:
Voltage rises linearly with increasing
nitrogen, from 0 V at 0 ppm to 1 V at
full scale ppm. (Full scale = 100% of
programmable range.)
0–1 VDC Range ID:
0.25 V = Low Range, 0.5 V = Medium
Range, 0.75 V = High Range, 1 V =
100ppm.
4–20 mA DC % Range: Current increases linearly with
increasing nitrogen, from 4 mA at 0
ppm to 20 mA at full scale ppm. (Full
scale = 100% of programmable range.)
4–20 mA dc Range ID:
8 mA = Low Range, 12 mA = Medium
Range, 16 mA = High Range, 20 mA
= 100ppm.
Table 3-1: Analog Output Connections
Pin
Function
3
+ Range ID, 4-20 mA, floating
4
– Range ID, 4-20 mA, floating
5
+ % Range, 4-20 mA, floating
6
– % Range, 4-20 mA, floating
8
+ Range ID, 0-1 V dc
23
– Range ID, 0-1 V dc, negative ground
24
+ % Range, 0-1 V dc
7
– % Range, 0-1 V dc, negative ground
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Installation
Model 2120XL
Alarm Relays: The nine alarm-circuit connector pins connect to the
internal alarm relay contacts. Each set of three pins provides one set of
Form C relay contacts. Each relay has both normally open and normally
closed contact connections. The contact connections are shown in Table
3-2. They are capable of switching up to 3 amperes at 250 VAC into a
resistive load. The connectors are:
 Threshold Alarm 1:

Can be configured as high (actuates when concentration is
above threshold), or low (actuates when concentration is
below threshold).

Can be configured as failsafe or non-failsafe.

Can be configured as latching or non-latching.

Can be configured out (defeated).
 Threshold Alarm 2:

Can be configured as high (actuates when concentration is
above threshold), or low (actuates when concentration is
below threshold).

Can be configured as failsafe or non-failsafe.

Can be configured as latching or non-latching.

Can be configured out (defeated).
Table 3-2: Alarm Relay Contact Pins
Pin
Contact
45
Threshold Alarm 1, normally closed contact
28
Threshold Alarm 1, moving contact
46
Threshold Alarm 1, normally open contact
42
Threshold Alarm 2, normally closed contact
44
Threshold Alarm 2, moving contact
43
Threshold Alarm 2, normally open contact
36
System Alarm, normally closed contact
20
System Alarm, moving contact
37
System Alarm, normally open contact
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Trace Nitrogen in Argon Analyzer
Installation
Digital Remote Cal Inputs: Accept 0 V (off) or 24 VDC (on) inputs for
remote control of calibration. (See Remote Calibration Protocol below.)
See Table 3-3 for pin connections.
Zero: Floating input. 5 to 24 V input across the + and – pins
puts the analyzer into the Zero mode. Either side may be
grounded at the source of the signal. 0 to 1 volt across
the terminals allows Zero mode to terminate when done.
A synchronous signal must open and close the external
zero valve appropriately. See Remote Probe Connector.
Span: Floating input. 5 to 24 V input across the + and – pins
puts the analyzer into the Span mode. Either side may be
grounded at the source of the signal. 0 to 1 volt across
the terminals allows Span mode to terminate when done.
A synchronous signal must open and close external span
valve appropriately. See Figure 3-4 Remote Valve
Connections.
Cal Contact: This relay contact is closed while analyzer is spanning
and/or zeroing. (See Remote Calibration Protocol below.)
Table 3-3: Remote Calibration Connections
Pin
Function
9
+ Remote Zero
11
– Remote Zero
10
+ Remote Span
12
– Remote Span
40
Cal Contact
41
Cal Contact
Remote Calibration Protocol: To properly time the Digital Remote Cal
Inputs to the Model 2120XL Analyzer, the customer's controller must
monitor the Cal Relay Contact.
When the contact is OPEN, the analyzer is analyzing, the Remote
Cal Inputs are being polled, and a zero or span command can be sent.
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Installation
Model 2120XL
When the contact is CLOSED, the analyzer is already calibrating. It
will ignore your request to calibrate, and it will not remember that
request.
Once a zero or span command is sent, and acknowledged (contact
closes), release it. If the command is continued until after the zero or
span is complete, the calibration will repeat and the Cal Relay Contact
(CRC) will close again.
For example:
1. Test the CRC. When the CRC is open, Send a zero command
until the CRC closes (The CRC will quickly close.)
2. When the CRC closes, remove the zero command.
3. When CRC opens again, send a span command until the
CRC closes. (The CRC will quickly close.)
4. When the CRC closes, remove the span command.
When CRC opens again, zero and span are done, and the sample is
being analyzed.
Note: The Remote Valve connections (described below) provides
signals to ensure that the zero and span gas valves will be
controlled synchronously. If you have the Auto Caibration
Option, it includes additional zero and span gas inputs—
the 2120XL automatically regulates the zero, span and
sample gas flow.
Range ID Relays: Four dedicated Range ID relay contacts. The first
three ranges are assigned to relays in ascending order—Low range is
assigned to Range 1 ID, Medium range is assigned to Range 2 ID, and
High range is assigned to Range 3 ID. The fourth range is reserved for
the Cal Range. Table 3-4 lists the pin connections.
Table 3-4: Range ID Relay Connections
Pin
Function
21
Range 1 ID Contact
38
Range 1 ID Contact
22
Range 2 ID Contact
39
Range 2 ID Contact
19
Range 3 ID Contact
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Trace Nitrogen in Argon Analyzer
18
Range 3 ID Contact
34
Range 4 ID Contact (not used)
35
Range 4 ID Contact (not used)
Installation
Network I/O: A serial digital input/output for local network protocol.
At this printing, this port is not yet functional. It is to be used for future
options to the instrument. Pins 13 (+) and 29 (–).
Remote Valve Connections: The Model 2120XL is a single-chassis
instrument and does not have a Remote Probe. Instead, the Remote
Probe connections are used as a method for directly controlling external
sample/zero/span gas valves. See Figure 3-4.
Figure 3-4: Remote Valve Connections
The voltage from these outputs is nominally 0 V for the OFF and
15 VDC for the ON conditions. The maximum combined current that
can be pulled from these output lines is 100 mA. (If two lines are ON at
the same time, each must be limited to 50 mA, etc.) If more current
and/or a different voltage is required, use a relay, power amplifier, or
other matching circuitry to provide the actual driving current.
In addition, each individual line has a series FET with a nominal
ON resistance of 5 ohms (9 ohms worst case). This can limit the
obtainable voltage, depending on the load impedance applied. See
Figure 3-5.
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Installation
Model 2120XL
Figure 3-5: FET Series Resistance
3.5.3 RS-232 Port
The digital signal output is a standard, full duplex RS-232 serial
communications port used to connect the analyzer to a computer,
terminal, or other digital device. It requires a standard 9-pin D
connector.
The output data is status information, in digital form, updated every
two seconds. Status is reported in the following order:
 The concentration in ppm or percent
 The range in use (HI, MED, LO)
 The span of the range (0-100 ppm, etc)
 Which alarms—if any—are disabled (AL–x DISABLED)
 Which alarms—if any—are tripped (AL–x ON).
Each status output is followed by a carriage return and line feed.
Three input functions using RS-232 have been implemented to
date. They are described in Table 3-5.
Table 3-5: Commands via RS-232 Input
Command
Description
as<enter>
Immediately starts an autospan.
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Trace Nitrogen in Argon Analyzer
Installation
az<enter>
Immediately starts an autozero.
st<enter>
Toggling input. Stops/Starts any
status message output from the
RS-232, until st<enter> is sent
again.
The RS-232 protocol allows some flexibility in its implementation.
Table 3-6 lists certain RS-232 values that are required by the Model
2120XL implementation.
Table 3-6: Required RS-232 Options
Parameter
Setting
Baud
9600
Byte
8 bits
Parity
none
Stop Bits
Message Interval
1
2 seconds. When CRC opens
again, zero and span are done,
and the sample is being analyzed.
3.6 Gas Connections
CAUTION:
THIS INSTRUMENT IS NOT DESIGNED TO HANDLE
HAZARDOUS GASES.
OZONE EMISSIONS CAN OCCUR IF AIR OR
MOISTURE ARE IONIZED IN THE SAMPLING
SYSTEM. THE SAMPLE PATH MUST BE
RELATIVELY FREE OF AIR AND/OR MOISTURE
BEFORE APPLYING THE IONIZING VOLTAGE.
KEEP THE MODEL 2120XL POWER OFF AND PURGE
THE EXTERNAL TUBING. THEN APPLY POWER TO
PURGE THE INTERNAL LINES. ANALYZER POWER
IS NEEDED TO PURGE ANALYZER SINCE THE
FLOW CONTROL MODULE NEEDS POWER TO
OPERATE. MAKE SURE THAT THE VENT IS AT
ATMOSPHERIC PRESSURE.
Teledyne Analytical Instruments
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Installation
Model 2120XL
Note: Air leaking into the sampling system will cause erratic or
unsatisfactory analyzer operation. Even if air is admitted
into the system for only a few minutes, you must purge the
regulator and the system for at least 1 hour before the
readings stabilize. See Section 3.7.
Whenever a fitting on the sample system is opened, use a
new ferrule and cone or new gasket depending on the type
of fitting to secure a gas tight seal. Each fitting should be
leak checked whenever a connection has been opened or
disturbed in any manner.
All gas connections are made to the 1/8” tube fittings installed on
the rear panel. See Figure 3-2. The connections include:

Sample Gas In

Exhaust Gas Out (Vent)

Instrument Air (optional calibration valves)

Purge Gas (optional calibration valves)

Span Gas In (optional calibration valves)

Zero Gas In (optional calibration valves)
CAUTION:
EQUIPMENT DAMAGE MAY RESULT IF THE
ANALYTICAL CELL IN THIS UNIT IS EXPOSED TO
PRESSURE, CAUSING IT TO BREAK OR SHATTER.
TO PREVENT THIS, NEVER EXCEED 20 PSIG (138
KPA) ON THE INLET PORT AND ALWAYS MAINTAIN
THE VENT AT ATMOSPHERIC PRESSURE.
DO NOT BLOCK THE VENT. ANY BACKPRESSURE
ON THE VENT WILL CAUSE DAMAGE TO THE
ANALYTICAL CELL.
To connect the gas line:
1. Connect an unobstructed vent line to the 1/8” (0.32 cm)
Swagelok fitting on the vent port on the rear of the analyzer.
2. Connect the purge gas input to the analyzer at the Purge Inlet.
3. On units equipped with the optional calibration valve,
connect a source of instrument air to the unit. The air supply
must be regulated to 65-70 psig.
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Trace Nitrogen in Argon Analyzer
CAUTION:
Installation
AIR PRESSURE LESS THAN 65 PSIG WILL RESULT
IN A FLOW RESTRICTION.
4. Connect the span and zero lines to the rear panel fittings
supplied for this purpose. The span and zero gas inputs must
be pressure regulated to the same pressure as the sample gas
(4-20 psig).
Note: If this instrument is without the auto calibration option,
there will be no rear panel fittings for zero and span
gases. The customer must install a suitable valve switching
manifold or tee the calibration gases with valves into the
sample in line.
3.6.1 Typical Sample System
A suggested sample system is shown in Figure 3-6. This system
allows you to switch the analyzer between zero or span calibration
gases and the process gas streams quickly and efficiently without
disconnecting the analyzer and introducing air in the system.
Figure 3-6: Suggested Sample System
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Installation
Model 2120XL
The sample manifold system must be designed so that you can:

Purge the sample line and pre-adjust the flow rate before
admitting a sample to the analytical cell.

Maintain a flow of argon through the analytical cell
whenever ionization voltage is being applied.
The following guidelines are presented as an aid in constructing a
suitable external sampling system for the Model 2120XL:

Alter the geometry of the system in Figure 3-2, as necessary,
to suit your specific needs and to maintain access to items on
the rear panel. However, alterations should be adhered to
schematically.

Use 1/8-inch (0.32 cm) electro-polished stainless steel tubing
for all parts of the manifold between the source and sample
inlet connections of the analyzer. Although you can use 1/4inch (0.64 cm) tubing, it is not recommended. The manifold
should be a welded assembly wherever possible.

Use only high-purity components with metal seals.

Eliminate excess components.

Minimize "dead spaces" in the sample lines.

Use a 1/8 inch compression fitting for the analyzer inlet
connection.

Use a high-quality regulator or device to maintain a constant
pressure to the zero, sample, and span inlet lines. Teledyne
recommends using a high-purity regulator with the following
specifications:

2-stage tiered diaphragm

100 psi outlet

15 RA max

5 ports

CGA 580 welded on inlet side

1/8 M (1 port), 1/8 F (1 port)

2 gauges
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Trace Nitrogen in Argon Analyzer
Installation
3.6.2 Gas Connections to the Instrument
CAUTION:
EQUIPMENT DAMAGE MAY RESULT IF THE
ANALYTICAL CELL IN THIS UNIT IS EXPOSED TO
PRESSURE ABOVE ATMOSPHERIC, CAUSING IT TO
BREAK OR SHATTER. TO PREVENT THIS, NEVER
EXCEED 20 PSIG (138 KPA) ON THE INLET PORT.
ALWAYS ENSURE THAT THE VENT IS AT
ATMOSPHERIC PRESSURE.
DO NOT REMOVE THE FLOW CONTROL ORIFICE
FROM THE SAMPLE INLET OF THE ANALYZER.
DO NOT BLOCK THE VENT.
To connect the gas line:
1. Connect an unobstructed vent line to the 1/8-in Swagelok
fitting on the vent port on the rear of the analyzer.
2. Connect the inlet line from the sample manifold system,
regulated to 4 to 20 psig (41 kPa), to the 1/8-in Input port
fitting on the rear of the analyzer.
3.7 Purging
The Model 2120XL is equipped with a flow control module
installed in the analyzer sample inlet to regulate flow and pressure to the
analytical cell. A maximum inlet pressure of 20 psig (138 kPa) is
allowable.
CAUTION:
OZONE EMISSIONS ARE POSSIBLE IF AIR OR
MOISTURE IS IONIZED IN THE SAMPLING SYSTEM.
THE SAMPLE PATH MUST BE RELATIVELY FREE
OF AIR AND/OR MOISTURE BEFORE APPLYING THE
IONIZING VOLTAGE.
KEEP THE MODEL 2120XL POWER OFF AND PURGE
THE EXTERNAL TUBING. THEN APPLY POWER TO
PURGE THE INTERNAL LINES. ANALYZER POWER
IS NEEDED TO PURGE ANALYZER SINCE THE
FLOW CONTROL MODULE NEEDS POWER TO
OPERATE.
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Installation
Model 2120XL
When installing a new analyzer or starting up an analyzer that has
been idle for a period of time, the sampling system should be purged for
several hours to cleanse it of contaminants and water vapor.
Although high-purity sample gas may be used to purge the
analyzer, argon with a minimum purity of 99.999% is recommended.
The exact purge method depends on the sample manifold design
and construction. In general, each sample inlet line must be thoroughly
purged. Sufficient purge time becomes critical when sample lines longer
than 10 feet (3 m) are used.
To purge the analyzer (see Figure 3-2):
Note: Do not purge long lines through the analytical cell. First,
purge them through the purge flow rotameter; then transfer
flow to the analyzer cell as suggested in step 6, below. This
eliminates the possibility of contaminating the analytical cell
and having to purge for an extended period to reach
equilibrium.
1. Close all valves on the sample manifold.
2. Open the valve on sample inlet line to be purged and any
shut-off valve that may be installed.
3. Connect purge gas to the sample inlet line.
4. Use a flowmeter on the purge gas and adjust flow rate to 1
cfh (0.475 slpm) at no more than 7 psig (76 kPa) and purge
for at least one hour.
5. Close the sample inlet valve, and then repeat steps 2 through
4 to purge any other sample inlet lines.
6. After the last sample line and the zero and span gas inlet
lines have been purged, close the purge flowmeter valve,
open the valve controlling flow through the analytical cell,
and purge the analyzer with the sample flow set at 1 cfh
(0.475 slpm). Purge the analyzer for a minimum of 6
hours.
7. If cylinder argon is used as a purge gas, reconnect the
sample gas to sample manifold inlet.
8. After purging, a calibration should be performed.
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Trace Nitrogen in Argon Analyzer
Installation
3.8 Calibration
The Model 2120XL was calibrated at the factory in accordance
with the calibration data shipped with your instrument. Prior to using the
instrument for analysis the calibration must be checked using the factory
settings supplied. If the settings do not match, the instrument should be
recalibrated prior to using for the first time.
Calibration procedures require an understanding of how to operate
the instrument which is discussed in Section 4 of this manual. Refer to
Section 4.5.2 for calibration procedures after reading the entire section
on operating the instrument (Section 4).
3.9 Installation Checklist
After installing the system, and prior to powering up the system,
verify the following items:
1. Each gas line has been purged for at least 1 hour prior to
connection to the analyzer inlets.
2. There are no leaks at the sample inlet gas connection to the
instrument.
3. There are no leaks between the span gas cylinder and the
analyzer span gas inlet port when span gas is flowing to the
analyzer.
4. There are no leaks between the zero gas source and the
analyzer zero gas inlet port when zero gas is flowing to the
analyzer.
5. The vent tube connection has no leaks, has an
unobstructed path to atmosphere, and is at least 1/8-in
(0.32-cm) OD.
6. All electrical connections have been made properly and the
Power Entry module is set for the appropriate power from
your facility.
Teledyne Analytical Instruments
33
Installation
Model 2120XL
Teledyne Analytical Instruments
34
Trace Nitrogen in Argon Analyzer
Operation
Operation
This section describes the operation and calibration procedures for
the Model 2120XL Trace Nitrogen in Argon Analyzer. Operation of the
analyzer involves potentially hazardous procedures. Only trained and
qualified personnel who have read and understood the instructions in
this manual should operate this equipment.
CAUTION:
DO NOT OPERATE THIS ANALYZER UNTIL YOU
HAVE READ AND UNDERSTOOD THE
INSTRUCTIONS IN THIS MANUAL. PAY
PARTICULAR ATTENTION TO ALL CAUTIONS AND
WARNINGS.
NEVER INTRODUCE GASES OTHER THAN ARGON
INTO THE ANALYZER IF EXPLOSIVE, FLAMMABLE,
OR CORROSIVE GASES OR GAS MIXTURES ARE
ALLOWED TO FLOW INTO THE ANALYZER, FIRE OR
EXPLOSION CAN RESULT.
THIS ANALYZER IS NOT DESIGNED FOR USE IN
HAZARDOUS AREAS.
EQUIPMENT DAMAGE MAY RESULT IF THE
ANALYTICAL CELL IN THIS UNIT IS EXPOSED TO
PRESSURE, CAUSING IT TO BREAK OR SHATTER.
TO PREVENT THIS, NEVER EXCEED 20 PSIG (38
KPA) ON THE INLET PORT AND ALWAYS MAINTAIN
THE VENT AT ATMOSPHERIC PRESSURE.
DO NOT REMOVE THE FLOW CONTROL ORIFICE
FROM THE SAMPLE INLET OF THE ANALYZER.
DO NOT BLOCK VENT.
Note: Maintain flow of sample gas through the analyzer when it is
not in use. This procedure is highly recommended in areas
of high humidity. Take care to keep the inside of the
instrument dry.
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Operation
Model 2120XL
4.1 Powering Up the Analyzer
CAUTION:
OZONE EMISSIONS ARE POSSIBLE IF AIR OR
MOISTURE ARE IONIZED IN THE SAMPLING
SYSTEM. THE SAMPLE PATH MUST BE
RELATIVELY FREE OF AIR AND/OR MOISTURE
BEFORE APPLYING THE IONIZING VOLTAGE.
KEEP THE POWER OFF UNTIL THE ANALYZER IS
FULLY PURGED.
1. Purge the analyzer and sampling system using the procedure
described in Section 3.7.
2. Connect the power cord to the proper power source for your
analyzer. The analyzer will begin its power up sequence
CAUTION:
EQUIPMENT DAMAGE MAY RESULT IF THE
ANALYTICAL CELL IN THIS UNIT IS EXPOSED TO
EXCESSIVE PRESSURE, CAUSING IT TO BREAK OR
SHATTER.
3. Observe the display while allowing the instrument to warm
up and the readings stabilize. Drift occurs until internal
temperatures stabilize and the analytical cell is completely
purged. A persistent drift indicates an improperly purged
system or an air leak into the system.
4.2 Zero and Span Calibration
The Model 2120XL is designed to provide a linear response over
the 0-100 ppm concentration range for nitrogen in argon. Therefore, a
two-point (zero and span) calibration is sufficient to define the
calibration curve for this analyzer.
Prior to shipment, the analyzer was calibrated and linearized at the
factory in accordance with the calibration data shipped with your
analyzer. Use these settings to verify that the unit is in calibration, or recalibrate the analyzer as outlined in Section 4.5.2. Recalibrations are
required periodically. The user can also redefine the linearization curve
for this instrument. Refer to Section 4.5.1.12.
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Trace Nitrogen in Argon Analyzer
Operation
4.3 Setup and Operation General Information
Once the analyzer has been installed, it can be configured for your
application. To do this you will:
 Set system parameters:

Establish a security password, if desired, requiring
Operator to log in.
Establish and start an automatic calibration cycle, if
desired.
Calibrate the instrument.
Define the three user selectable analysis ranges. Then choose
auto ranging or select a fixed range of analysis, as required.
Set alarm setpoints, and modes of alarm operation (latching,
failsafe, etc).




Before you configure your Model 2120XL Analyzer these default
values are in effect:
Ranges: LO = 1 ppm, MED = 10 ppm, HI = 100 ppm.
Auto Ranging: ON
Alarm Relays: Defeated, 100 and 200 ppb, HI, Not failsafe, Not
latching.
Zero: Auto, every 0 days at 0 hours.
Span: Auto, at 000008.00 ppm, every 0 days at 0 hours.
If you choose not to use password protection, the default password
is automatically displayed on the password screen when you start up,
and you simply press ENTER for access to all functions of the analyzer.
4.4 Using the Data Entry and Function Buttons
Data Entry Buttons: The ◄►arrow buttons select options from
the menu currently being displayed on the VFD screen. The selected
option blinks.
When the selected option includes a modifiable item, the ▲/▼
arrow buttons can be used to increment or decrement that modifiable
item.
The ENTER button is used to accept any new entries on the VFD
screen. The ESCAPE button is used to abort any new entries on the
Teledyne Analytical Instruments
37
Operation
Model 2120XL
VFD screen that are not yet accepted by use of the ENTER key or to
move backwards through previous screens.
The VFD screen text that accompanies each operation is reproduced, at the appropriate point in the procedure, in a Arial Narrow Bold
type style. The various operational modes are printed in CAPITALIZED
ITALICS.
Figure 4-1 shows the hierarchy of functions available to the
operator via the screen menus.
Any function can be selected at any time by pressing the
appropriate key (unless password restrictions apply).
Each of these functions is described in greater detail in the
following procedures.
4.5 Analyzer Functions
Analyzer functions are accessed from front panel keys.
There are six selectable functions plus the ENTER and ESCAPE
keys. They are:
1. Analyze: This is the main operational screen of the
analyzer and displays the current concentration plus an error
indication if any error exists.
2. System: This function contains nine sub functions that are
used to user to set up the instrument for your application.
3. Span: Contains sub functions used for span calibration.
4. Zero: Contains sub functions used for zero calibration.
5. Alarms: Contains sub functions used to configure the
concentration alarms.
6. Range: Allows the user to set the upper bound of the
instrument range.
In the following section, Section 4.5.1, each screen display is
described with information on how to access and modify the various
items within each screen.
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Trace Nitrogen in Argon Analyzer
Operation
Figure 4-1: Hierarchy of Functions and Sub Functions
4.5.1 System Menu
Dig_filt Self-test
Pwd Logout Err More
.
.
Autocal Flow Hold
Calholdtimer
More
.
Model Out-cal Lin
There are eleven sub functions within the System function as
described below. Specific procedures for their use follow the
descriptions.
Teledyne Analytical Instruments
39
Operation












Model 2120XL
Dig Filt: The Model 2120XL includes a user adjustable
digital filter. The filter has settings 1-10. Setting 1 is the least
amount of filtering and 10 is the highest level of damping.
Self–Test: The instrument performs a self-diagnostic test to
check the integrity of the power supply, output boards and
amplifiers.
PSWD: Security can be established by choosing a 5 digit
password (PSWD) from the standard ASCII character set.
(See Installing or Changing a Password, below, for a table of
ASCII characters available.)
Logout: Logging out prevents an unauthorized tampering
with analyzer settings.
More: Select and enter More to get a new screen with
additional sub functions listed.
Auto-Cal: Used to define an automatic calibration sequence
and/or start an Auto-Cal.
Flow: Used to set the flow through the flow controller.
TRAK/HLD: The operator sets whether the instrument
analog outputs track the concentration change during
calibration and sets a time delay for the concentration alarms
after calibration
Cal Hold Timer: Allows alarm suppression and analog
output value hold times during calibration events for a user
adjustable period.
Model: Displays Manufacturer, Model, and Software
Version of the instrument.
Out-Cal: Analog output calibration allows the user to
calibrate the 4 and 20 mA analog output values.
Lin: Used to linearize the output of the controller.
To enter any of the system functions, use the ◄►arrow keys to
move to the function and then use the ENTER key to engage that
function.
4.5.1.1 DIGITAL FILTER
Upon entering the digital filter function, the following screen
appears on the display:
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Trace Nitrogen in Argon Analyzer
Operation
Weight of Digital
Filter:
4
The current filter setting (4 in this case) will be flashing. It can be
modified from 0 (no filtering) to 10 maximum filtering using the ▲/▼
keys. Pressing ENTER will accept the value and return to the SYSTEM
menu.
The default setting should suffice for most applications. In some
applications where speeding the response time with some trade off in
noise is of value, the operator could decrease the number of the digital
filter. In applications where the signal is noisy, switch to a higher
number, however, the response time will decrease.
4.5.1.2 SELF-TEST
The system self-test is automatically initiated when the unit is
powered up. It can also be activated by the user from the SYSTEM menu.
To manually initiate a self-test, press the STSTEM key and navigate to
Self-Test using the ◄►arrow keys. Press ENTER to engage the
function and the following screen appears:
Perform System Test?
<ENT> Yes <ESC> No
Pressing ENTER will begin the Self-Test. A successions of
diagnostic screens will follow:
RUNNING DIAGNOSTIC
Testing Preamp — 83
During preamp testing there is a countdown in the lower right
corner of the screen. When the testing is complete, the results are
displayed.
Power: ##
Analog: ##
Preamp: ##
The module is functioning properly if it is followed by OK. If a
problem is detected, a number will appear next to the heading and
Teledyne Analytical Instruments
41
Operation
Model 2120XL
indicates a problem in a specific area of the instrument. Refer to Chapter
5 Maintenance and Troubleshooting for number-code information. The
results screen alternates for a time with:
Press Any Key
To Continue...
Then the analyzer returns to the initial System screen.
4.5.1.3 PASSWORD PROTECTION
Security can be established by choosing a 3 digit password (PSWD)
from the standard ASCII character set. (See Installing or Changing a
Password, below, for a table of ASCII characters available.)
Once a unique password is assigned and activated, the operator
MUST enter the UNIQUE password to gain access to set-up functions
which alter the instrument's operation, such as setting the instrument
span or zero setting, adjusting the alarm setpoints, or defining an
analysis range.
After a password is assigned, the operator must log out to activate
it. Until then, anyone can continue to operate the instrument without
entering the new password.
Only one password can be defined. Before a unique password is
assigned, the system assigns TAI by default. This allows access to
anyone. After a unique password is assigned, to defeat the security, the
password must be changed back to TAI.
If a password is assigned, then setting the following instrument
parameters can be done only after the password is entered: span and
zero settings, alarm setpoints, analysis range definitions, switching
between auto ranging and manual override. In addition, all System
functions such as setting up an auto-cal, self-test and assigning a new
password etc. with the exception of Track/Hold and Model cannot be
accessed without entering a password. However, the instrument can still
be used for analysis without entering the password.
If you have decided not to employ password security, use the
default password TAI. This password will be displayed automatically by
Teledyne Analytical Instruments
42
Trace Nitrogen in Argon Analyzer
Operation
the microprocessor. The operator just presses the Enter key to be
allowed total access to the instrument’s features.
Note: If you use password security, it is advisable to keep a copy
of the password in a separate, safe location.
4.5.1.3.1 Entering the Password
To install a new password or change a previously installed
password, you must key in and ENTER the old password first. If the
default password is in effect, pressing the ENTER button will enter the
default TAI password for you.
Press System to enter the System mode.
Use the ◄►arrow keys to scroll the blinking over to PSWD, and
press ENTER to select the password function. Either the default TAI
password or AAA place holders for an existing password will appear on
screen depending on whether or not a password has been previously
installed.
Enter PWD: TAI
or
AAA
If you are not using password protection, press ENTER to accept
TAI as the default password. If a password has been previously installed,
enter the password using the ◄►arrow keys to scroll back and forth
between letters, and the ▲/▼ arrow keys to change the letters to the
proper password. Press ENTER to enter the password.
If the password is accepted, the screen will indicate that the
password restrictions have been removed and you have clearance to
proceed.
PSWD Restrictions
Removed
In a few seconds, you will be given the opportunity to change this
password or keep it and go on.
Teledyne Analytical Instruments
43
Operation
Model 2120XL
Change Password?
<ENT>=Yes
<ESC>=No
Press ESCAPE to move on, or proceed as in Changing the
Password, below.
4.5.1.3.2 Installing or Changing the Password
If you want to install a password, or change an existing password,
proceed as above in Entering the Password. When you are given the
opportunity to change the password:
Change Password?
<ENT>=Yes
<ESC>=No
Press ENTER to change the password (either the default TETAI or
the previously assigned password), or press ESCAPE to keep the
existing password and move on.
If you chose ENTER to change the password, the password
assignment screen appears.
Enter New Pwd: T A I
or
Enter New Pwd: AAA
Enter the password using the ◄►arrow keys to move back and
forth between the existing password letters, and the ▲/▼ arrow keys to
change the letters to the new password. The full set of 94 characters
available for password use are shown in the table below.
Characters Available for Password Definition:
A
K
U
i
B
L
V
`
j
C
M
W
a
k
D
N
X
b
l
E
O
Y
c
m
F
P
Z
d
n
G
Q
[
e
o
Teledyne Analytical Instruments
H
R
¥
f
p
I
S
]
g
q
J
T
^
h
r
44
Trace Nitrogen in Argon Analyzer
s
}
)
3
=
t
→
*
4
>
u
!
+
5
?
v
"
'
6
@
w
#
7
Operation
x
$
.
8
y
%
/
9
z
&
0
:
{
'
1
;
|
(
2
<
When you have finished typing the new password, press Enter. A
verification screen appears. The screen will prompt you to retype your
password for verification.
Confirm Pwd: ‘ A A A’
Retyping the password will confirm proper password is entered and
the following screen will appear briefly:
New Pwd Accepted
and then return to the System menu.
Use the arrow keys to retype your password and press Enter when
finished. Your password will be stored in the microprocessor and the
system will immediately switch to the Analyze screen, and you now
have access to all instrument functions.
If all alarms are defeated, the Analyze screen appears as:
0.0
p
pm
Anlz
Range: 0 — 100
If an alarm is tripped, the second line will change to show which
alarm it is:
0.0
p
pm
Anlz
AL—1
Note: If you log off the system using the logout function in the
system menu, you will now be required to re-enter the
password to gain access to Span, Zero, Alarm, and Range
functions.
Teledyne Analytical Instruments
45
Operation
Model 2120XL
4.5.1.4 LOGOUT
The Logout function provides a convenient means of leaving the
analyzer in a password protected mode without having to shut the
instrument off. By entering Logout, you effectively log off the
instrument leaving the system protected against use until the password is
reentered. To log out, press the System button to enter the System
function.
Dig_filt Self-test
Pwd Logout Err More
Use the ◄►arrow keys to position the blinking over the Logout
function, and press ENTER to Log out. The screen will display the
message:
Protected Until
Password Reentered
4.5.1.5 ERR
During analysis, if the system detects a fault, and error signal is
sent and shows a flashing ‘E’ in the right corner of the Analyze screen
as follows:
N2
2.3 ppb
E
Rng: 100.0pb 100.2 ccm
To obtain more information about the error, press SYSTEM and
navigate to the Err function. Then pres ENTER to display the particular
error screen. There are 14 possible error screens that may appear. The
first line displays the particular fault while the second line informs the
user to press ENTER to clear the error.
Note: The particular fault must be remedied before attempting to
clear the error, otherwise the error indication will
immediately regenerate on the Analyze screen.
The following notifications may appear on the Err screen first line:

LED Display Error

Flow Error
Teledyne Analytical Instruments
46
Trace Nitrogen in Argon Analyzer

Neg. Flow Adc Error

Bad Adc Channel Sel.

Bad Gain Selected

Zero Fail

Span Fail

Sys Test - - 5V

Sys Test - - 15V

Sys Test - - Dac A

Sys Test - - Dac B

Sys Test - - Preamp 0.0V

Sys Test - - Preamp 0.7V

Sys Test - - Pre Gain Ck
Operation
See Section 5.5 for additional information on error screens.
4.5.1.6 AUTO CALIBRATION (AUTO CAL)
This menu allows the user to set a program for initiating a
calibration cycle (zero and span) automatically at a time interval set by
the user. It also is the screen used to turn the auto calibration function
ON or OFF. To use the Auto Cal function, your instrument must be
equipped with the optional auto calibration valve manifold.
Note: To use the Auto Cal function, the analyzer must be
equipped with the Auto Cal option which includes a
solenoid valve manifold for automatic switching of sample,
zero or span gas.
When equipped with the Auto Cal option, the analyzer can cycle
itself through a sequence of steps that automatically zero and span the
instrument.
Note: Before setting up an AUTO-CAL, be sure you understand
the Zero and Span functions as described in Section 4.5.2,
and follow the precautions given there.
Note: If you require highly accurate AUTO-CAL timing, use external
AUTO-CAL control where possible. The internal clock in the
Teledyne Analytical Instruments
47
Operation
Model 2120XL
Model 2120XL is accurate to 2-3 %. Accordingly, internally
scheduled calibrations can vary 2-3 % per day.
To setup an Auto Cal cycle:
Choose SYSTEM from the function buttons. Use the ◄►arrow
keys to position the blinking over the More function, and press ENTER.
A second display of System functions will appear. Use the ◄►arrow
keys again to position the blinking over the Auto Cal function, and
press ENTER to enter the function. The following screen will appear:
Zero In
0d 0h Off
Span In
0d 0h Off
Press the ▲/▼ arrow keys to blink ZERO (or SPAN), then press
ENTER again.
Note: You will be unable to set OFF to ON if a zero interval is
entered.
A Span Every ... (or Zero Every ...) screen appears.
Zero schedule: OFF
Day: Ød Hour: Øh
Move the blinking highlight to the Day field , then use the ▲/▼
arrow keys to display the correct value for the day.
Once the correct day is displayed press ENTER to accept the value
and to move to the start-time value. Use the ▲/▼ arrow keys to set a
start-time value. Press ENTER again to accept the value.
To turn ON the SPAN and/or ZERO cycles (to activate the auto cal
feature):
If a scheduled day and time has just been entered, press ESCAPE to
return to the previous menu or press SYSTEM again and move to the
AUTO CAL function with the ◄► keys and press ENTER again.
When the ZERO/SPAN values screen appears, use the ▲/▼ arrows
to blink the ZERO (or SPAN) and press ENTER to go to the next screen.
Use the ◄► arrows to select the OFF/ON field. Use the ▲/▼arrows to
set the OFF/ON field to ON. You can now turn these fields ON because
there is a nonzero span interval defined.
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Trace Nitrogen in Argon Analyzer
Operation
If instrument is turned off, the next time the instrument is powered,
the instrument will automatically perform a calibration cycle after 3
minutes of entering the sample mode if AUTO CAL functions were on
prior to shut down.
4.5.1.7 FLOW
This function allows the user to set the flowrate through the flow
control valve. The first line of the display indicates the current flow
setting in ccm and can be manipulated using the ▲/▼ arrow keys. The
second line of the display is a read-only item that displays the live
sensor voltage within the flow control module.
To set or change the flow rate, press the SYSTEM key and use the
◄►arrow keys to position the blinking over the More function, and
press ENTER. A second screen of system function will appear. Use the
◄►arrow keys to position the blinking over the Flow function, and
press ENTER to enter the function. The following screen will appear:
Flow: 100.0 ccm
Sens Vout: 300.0 mV
The current flow rate (100) will be blinking and can be changed
using the ▲/▼ arrow keys. Press ENTER when the proper flow rate is
indicated on the display screen.
4.5.1.8 TRACKING DURING CALIBRATION
The user has the option of setting the preference as to whether the
analog outputs track the display readings during calibration or not. The
function can be toggled between Track or Hold in this function.
To set the preference, press the SYSTEM key and the first System
menu will appear in the VFD display. Use the ◄►arrow keys to
position the blinking over the More function, and press ENTER. A
second screen of system function will appear. Use the ◄►arrow keys to
position the blinking over the Track (or Hold) function, and toggle
between Track or Hold using the ▲/▼ arrow keys. Press ENTER when
the desired selection is indicated on the display screen.
If Hold is selected, the next function Calholdtimer sets the hold
period.
Teledyne Analytical Instruments
49
Operation
Model 2120XL
When HOLD is selected, the analog output (4-20 mA) and the
range ID contacts will freeze on their last state before entering one of the
calibration modes. When the instrument returns to the Analyze mode,
either by a successful or an aborted calibration, there will be a threeminute delay before the analog outputs and the range ID contacts start
tracking again.
The concentration alarms freeze on their last state before entering
calibration regardless of selecting HOLD or TRACK. But, when HOLD
is selected the concentration alarms will remain frozen for the time set in
the Calholdtimer screen after the analyzer returns to the Analyze mode.
See Section 4.5.1.9 Calibration Hold Timer.
4.5.1.9 CALIBRATION HOLD TIMER (CALHOLDTIMER)
This function sets the time period for the analog output hold as well
as the time period for which the alarms will be suppressed during a
calibration event.
To set the time period for a hold, press the SYSTEM key to display
the first System menu. Use the ◄►arrow keys to position the blinking
over the More function, and press ENTER. A second screen of system
function will appear. Use the ◄►arrow keys to position the blinking
over the Calholdtimer function, and press ENTER to advance to the
Calholdtimer screen.
Calbrt hold:
1 min
Sample hold:
1 min
The time intervals can be set from 0 (off) to 100 minutes using the
▲/▼ arrow keys. Press ENTER when the desired value is displayed.
The factory default is three minutes, but the delay time is programmable. This preference is stored in non-volatile memory so that it is
recovered if power is removed from the instrument.
4.5.1.10 THE MODEL SCREEN
The Model screen displays the manufacturer, model, and software
version information for your analyzer.
To view the information in the Model function, press the SYSTEM
key to display the first System menu. Use the ◄►arrow keys to
position the blinking over the More function, and press ENTER. Repeat
Teledyne Analytical Instruments
50
Trace Nitrogen in Argon Analyzer
Operation
the above to ENTER at More a second time. This will display a third
screen of system functions as shown below.
Model Out-cal Lin
Use the ◄►arrow keys to position the blinking over the Model
function, and press ENTER to display your specific Model information.
4.5.1.11 ANALOG OUTPUT CALIBRATION (OUT_CAL)
For enhanced accuracy, this function allows the user to calibrate the
4 to 20 mA analog output to remove any offsets inherent in the PCB. A
DMM configured as a DC ammeter is needed. The DMM should be
connected across the output terminals of the 4 to 20 mA output to
monitor the output current. The range of adjustment is approximately
+/- 10% of scale (+/- 1.6 mA).
If the analyzer is equipped with a secondary 0-1 VDC output, this
function can be used to calibrate the 0 to 1 volt output as well by using a
digital voltmeter on the 0-1 volt output.
To enter the 4 to 20 mA output adjust function:
Press the SYSTEM key to display the first System menu. Use the
◄►arrow keys to position the blinking over the More function, and
press ENTER. Repeat the above to ENTER at More a second time. This
will display a third screen of system functions as shown below.
Model Out-cal Lin
Use the ◄►arrow keys to position the blinking over the Out_cal
function, and press ENTER. The following screen will appear:
Use UP/DOWN arrow to
Adjust 4 ma: 500
The current value associated with the 4 mA output will be
blinking. Use the ▲/▼ arrow keys to adjust it up or down. When the
desired value appears, Press ENTER to accept and save the value and
the display automatically moves to the next line for adjusting the 20 mA
setting.
Use UP/DOWN arrow to
Adjust 20 ma: 500
Teledyne Analytical Instruments
51
Operation
Model 2120XL
Repeat the process for adjusting the 20 mA output. Pressing
ENTER will accept the value and return the display to the last System
screen.
4.5.1.12 LINEARIZE (LIN)
With this function, the user has the capability of linearizing the
output of the instrument by flowing prepared samples with known
concentration across the analytical range. The linearization can be
performed manually or automatically depending on the setting chosen in
the linearization setup screen. Upon completion of the linearization
sample introduction, the software performs linear approximation
between data points.
The Model 2120XL can accept up to 11 linearization points. These
are:

Zero point (pure argon)

9 data points between zero and full span

Full Span (85-100 ppm N2 in Ar or 85-100% of the highest
full range)
The linearization can be performed manually or automatically
depending on the chosen setting.
To enter the linearization function:
Press the SYSTEM key to display the first System menu. Use the
◄►arrow keys to position the blinking over the More function, and
press ENTER. Repeat the above to ENTER at More a second time. This
will display a third screen of system functions as shown below.
Model Out-cal Lin
Use the ◄►arrow keys to position the blinking over the Lin function, and press ENTER. The following screen will appear:
Linearize
Manual
Auto
4.5.1.12.2 Setup Sub Function
The Setup sub function allows the operator to choose between
Manual or Automatic linearization. In manual mode the operator the
operator enters the value of the prepared linearization sample as reported
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52
Trace Nitrogen in Argon Analyzer
Operation
by the analyzer’s display. In Auto mode, this is done automatically by
the software.
From the Linearizer (Lin) function screen, use the ◄►arrow keys
to position the blinking over the Setup function, and press ENTER. The
following screen appears:
Linearize
Manual
Auto
To enter Manual or Auto Mode, use the ◄►arrow keys to position
the blinking over the Manual or Auto and press ENTER. The following
screen appears:
In 0.0ppb
Out 0.0ppb
1
Accept
where the number (1) in the right corner of the screen indicates the
linearization sample number currently being entered. In this exampe, it
is the first sample to be entered.
In MANUAL mode, the number adjacent to “In” is editable. It
represents the unlinearized concentration of the sample gas as reported
by the analyzer. In AUTO mode, this value is not editable but is entered
automatically by the routine. The value for “Out” is editable in both Man
and Auto modes. Out is entered by the user and represents the desired
linearized value of the sample. For instance, feeding the analyzer a
prepared linearizer sample gas whose concentration is known to be 10.0
ppm and the analyzer reports an unlinearized value of 13.6pm adjacent to
In, the user would correct this by entering 10.0pm as the Out value.
If not done already, hook up the first linearization sample to the
sample input of the analyzer and allow the gas to flow for a few minutes.
Watch the display and when the concentration value is stable, enter the
correct value for Out and then press ENTER to accept the value.
A confirmation screen will appear.
<ENT> Accept
<ESC> Reject
Pressing ENTER again will save the data into memory to be used
for calculating the coefficients used in the best fit linearization
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Operation
Model 2120XL
polynomial once all data has been entered. The screen will return to the
AUTO/MAN screen with the upper right number incremented by 1.
If ESCAPE is pressed, the data will be rejected and the screen will
return to the AUTO/MAN screen without incrementing the sample
number in the right corner.
Repeat the above procedures for each prepared linearization
sample making sure to adequately flush or purge the lines each time a
new sample is connected. The linearization process must include a zero
and full span value. Up to 11 data samples are to be entered.
When all 11 data points have been entered, change the ‘Accept’
field to ‘finish’ and press Enter to leave data entry mode.
Some Notes about Calibration: For the analyzer to preserve good
linearity throughout the 0-100 ppm scale, users must try to calibrate near
the top of the highest range (0-100 ppm). If calibration gas is low value,
for example 10 ppm, to improve accuracy at that level, you can expect to
have less accuracy when readings surge much higher than that.
4.5.2 The Zero and Span Functions
The Model 2120XL is designed to provide a linear response over
the analysis range for nitrogen in argon. Therefore, once the
linearization procedure has been performed as described in 4.5.1.12 , a
two-point (zero and span) calibration is sufficient to define the
calibration curve .
Prior to shipment, the analyzer was calibrated by the factory in
accordance with the calibration data shipped with your analyzer. Use
these settings to verify that the unit is in calibration, or re-calibrate the
analyzer as outlined in this section.
4.5.2.1 BEFORE CALIBRATION
Note: To minimize consumption of zero and span gases, careful
attention to the purging of the analyzer, as described in
Chapter 3, is critical.
1. Ensure that the analyzer is fully purged and warmed up.
2. Check that the sample gas flow rate is correct. Default
setting is 100 ccm See Section 2.2. Adjust the pressure
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Trace Nitrogen in Argon Analyzer
Operation
regulator on the sample inlet. Do not exceed a maximum of
20 psig (138 kPa).
4.5.2.2 RECOMMENDED CALIBRATION GASES
Teledyne recommends the following gases be used for calibration:
Zero Gas:
N2-free Ar
Span Gas:
For 0-1 ppm range:
0.7-1.0 ppm N2 in Ar
For 0-10 ppm range: 7-10 ppm N2 in Ar
For 0-100 ppm range: 70 – 100 ppm N2 in Ar (best for overall
accuracy on all ranges)
The first calibration point is fixed by a zero gas. The most
convenient source of nitrogen-free argon is through an activated
molecular sieve scrubber cooled to liquid oxygen temperatures or a
heated transition metal scrubber. A commercially available scrubber the
Teledyne Part number S1748-120 (or S1748 -240 depending on AC
voltage) is ideal for this. Alternatively, a zero gas cylinder with a low
ppb nitrogen level can be used for zeroing in the low ppm range
specified, as long as the N2 concentration is known.
The second point is fixed by a certified span gas normally supplied
in a high-pressure cylinder.
4.5.2.3 ZERO CAL
The ZERO button on the front panel is used to enter the zero
calibration function. Zero calibration can be performed in either the
automatic or manual mode. In the automatic mode, an internal
algorithm compares consecutive readings from the sensor to determine
when the output is within the acceptable range for zero. In the manual
mode, the operator determines when the reading is within the acceptable
range for zero. Make sure the zero gas is connected to the instrument.
See Section 3.6 for gas connections.
After pressing the ZERO button, the mode selection screen appears:
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Operation
Model 2120XL
Select Zero
Mode : Manual (Auto)
where Manual and Automatic can be toggled back and forth using the
▲/▼ arrow keys. Once the proper mode is displayed, press ENTER.
The following screen appears:
Zero Offset
0.0ppb
<ENT> to Begin
This screen allows the user to add a zero offset if desired. With the
value adjacent to Zero Offset blinking, use the ▲/▼ arrow keys to enter
any offset required. Press ENTER when finished.
4.5.2.3.1 Manual Zero
If manual zero mode was selected, the following screen appears:
N2: 1.2ppb
Zero
<ENT> to Finish
In the Manual Mode, the user has the opportunity to decide when
the zero settling is close enough to zero to be valid. When the value
adjacent to N2 is sufficiently close to zero and sufficiently stable, press
ENTER to accept the zero reading.
After pressing ENTER two screens will appear that indicate that the
zero level has been acquired and will report the live adc value for the
two gains in the amplifier (G0 and G1) as well as the change (Δ).
Zero Acquired
G1/1
Δ 1.2
Val:-12345
Zero Acquired
G0/1
Δ-0.2
Val:-12345
shortly followed by:
4.5.2.3.2 Auto Mode Zero
If AUTO mode was selected from the Zero Mode Selection screen
the following screen appears:
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Trace Nitrogen in Argon Analyzer
Zero Settling:
Operation
0:58
The time value displayed at the right count down to zero from the
value currently held in Calholdtimer. See Section 4.5.1.9.
When the counter reaches zero, the display switches to display the
gain on G1:
Zero Settling:
G1/11
Δ2.1
Val:-12345
where Δ Val:-12345 is a live display of the change in the adc.
Shortly the display will change to a second screen representing the
gain on G2:
Zero Acquired
G1/1
Δ-3.6
Val:-12345
Zero Acquired
G01/1
Δ 0.6
Val:-12345
followed by:
where the Δ Val:-12345 is the live display of the change in the adc for
G01.
When the countdown reaches zero, zero calibration is complete and
the screen reverts to the Analyze mode screen.
4.5.2.4 SPAN CALIBRATION
The SPAN button on the front panel is used to enter the span
calibration function. Span calibration can be performed in either the
automatic or manual mode. In the automatic mode, an internal
algorithm compares consecutive readings from the sensor to determine
when the output is within the acceptable range for span. In the manual
mode, the operator determines when the reading is are acceptably close
to the actual span concentration. Make sure the span gas is connected to
the instrument. See Section 3.6 for gas connections.
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Operation
Model 2120XL
After pressing the SPAN button, the mode selection screen appears:
Select Span
Mode : Manual (Auto)
where Manual and Automatic can be toggled back and forth using the
▲/▼ arrow keys. Once the proper mode is displayed, press ENTER.
The following screen appears:
Span
100.0ppm
<ENT> to begin Span
This screen allows the user to input the known concentration of the
span gas used. Uuse the ▲/▼ arrow keys to enter the span gas
concentration. Press ENTER when finished.
4.5.2.3.1 Manual Span
If manual span mode was selected, the following screen appears:
39.25 ppm
<ENT> to Finish
In the Manual Mode, the user has the opportunity to decide when
the span settling is close enough to the actual concentration to be valid.
When the value is sufficiently close to the known concentration and
sufficiently stable, press ENTER to accept the span calibration.
4.5.2.3.2 Auto Mode Span
If AUTO mode was selected from the Span Mode Selection screen
the following screen appears:
Span Settling:
0:58
The time value displayed at the right count down to zero from the
value currently held in Calholdtimer. See Section 4.5.1.9.
When the counter reaches zero, the display switches to display the
live adc change count.
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Trace Nitrogen in Argon Analyzer
Operation
N2: 123.0ppm
Δ
123
Span
where Δ 123.0 is a live display of the change in the adc.
When the change in adc value is reasonably small, the span
calibration is complete and the screen reverts to the Analyze mode
screen.
4.5.3 The Range Function
The Model 2120XL has three user programmable ranges extending
from 0-1 ppm to 0-100 ppm. The Range function is used to set the three
analysis ranges and to set whether the instrument functions on a fixed
range (1, 2 or 3) or uses auto ranging.
To set the range properties for your instrument, press the RANGE
button. The following screen appears:
R1: 1.00ppm R2: 10.00ppm
R3: 100.0ppm Rng: Auto
where either the 1.00, 10.00, 100.0, or Auto is blinking.
Use the ◄►arrow keys to position the blinking over the range
value to be changed . Then use the ▲/▼ arrow keys to modify the range
value. Continue with the ◄►arrow keys to position the blinking over
the next range value to be changed and modify with the ▲/▼ arrow
keys.
Move the blinking to the field at the far right of the second line and
set whether fixed analysis or auto-ranging is to be used. The field can be
toggled between these values:
1
(Fixed range analysis on range 1)
2
(Fixed range analysis on range 2)
3
(Fixed range analysis on range 3)
Auto
Auto-ranging.
Press ENTER when the range properties have been correctly set.
Use ESCAPE to return to the Analyze mode without altering the range
settings.
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Operation
Model 2120XL
Note: Range 1 must be set lower than range 2 and range two
less than range 3. Only the upper bound of the range may
be changed. The lower value will always remain at 0.
When auto-ranging is selected, the analyzer will automatically
switch to the appropriate range based on the concentration of the sample
gas under test.
4.5.4 The Alarms Function
The Model 2120XL is equipped with 2 fully adjustable concentration
alarms and one non-adjustable system alarm. Each alarm has a relay with
a set of form “C" contacts rated for 3 amperes resistive load at 250 VAC.
Refer to Chapter 3, Installation and/or the Interconnection Diagram
included at the back of this manual for relay connections.
The concentration alarms can be configured from the front panel as
either high or low alarms by the operator. The alarm modes can be set as
latching or non-latching, and either failsafe or non-failsafe, or, they can
be defeated altogether. The setpoints for the alarms are also established
using this function.
Decide how your alarms should be configured. The choice will
depend upon your process. Consider the following four points:
1. Which if any of the alarms are to be high alarms and which if
any are to be low alarms?
Setting an alarm as HIGH triggers the alarm when the
nitrogen concentration rises above the setpoint. Setting an
alarm as LOW triggers the alarm when the nitrogen
concentration falls below the setpoint.
Decide whether you want the alarms to be set as:
 Both high (high and high-high) alarms, or
 One high and one low alarm, or
 Both low (low and low-low) alarms.
2. Are either or both of the alarms to be configured as failsafe?
In failsafe mode, the alarm relay de-energizes in an alarm
condition. For non-failsafe operation, the relay is energized
in an alarm condition. You can set either or both of the
concentration alarms to operate in failsafe or non-failsafe
mode.
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Trace Nitrogen in Argon Analyzer
Operation
3. Are either of the alarms to be latching?
In latching mode, once the alarm or alarms trigger, they will
remain in the alarm mode even if process conditions revert
back to non-alarm conditions. This mode requires an alarm to
be recognized before it can be reset. In the non-latching
mode, the alarm status will terminate when process
conditions revert to non- alarm conditions.
4. Are either of the alarms to be defeated?
The defeat alarm mode is incorporated into the alarm circuit
so that maintenance can be performed under conditions
which would normally activate the alarms.
The defeat function can also be used to reset a latched alarm.
(See procedures, below.)
If you are using password protection, you will need to enter your
password to access the alarm functions. Follow the instructions in
Section 4.5.1.3 to enter your password. Once you have clearance to
proceed, enter the Alarm function.
Press the ALARM button on the front panel to enter the Alarm
function. Make sure that AL1 is blinking.
Sel Alarm to set
AL1
AL2
Set up alarm 1 by moving the blinking over to AL1 using the
◄►arrow keys. Then press ENTER to move to the next screen.
AL—100.0ppm
High
Dft—Y Fs—N Ltch—N
Five parameters can be changed on this screen:
 Value of the alarm setpoint, AL–1 #### ppb/ppm (nitrogen)
 Out-of-range direction, HI or LO
 Defeated? Dft–Y/N (Yes/No)
 Failsafe? Fs–Y/N (Yes/No)
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Operation
Model 2120XL
Latching? Ltch–Y/N (Yes/No).

To define the setpoint, use the ◄►arrow keys to move the
blinking over to AL–1 ####. Then use the ▲/▼ arrow keys to change the
number. Holding down the key speeds up the incrementing or
decrementing. (Remember, the setpoint units are ppm N2.)
To set the other parameters use the ◄►arrow keys to move the
blinking over to the desired parameter. Then use the ▲/▼ arrow keys to
change the parameter.
Once the parameters for alarm 1 have been set, press Alarms again,
and repeat this procedure for alarm 2 (AL2).
To reset a latched alarm, go to Dft– and then press either ▲ two
times or ▼ two times to toggle Dft from Y and then back to N.
–OR –
Go to Ltch– and then press either ▲ two times or ▼ two times.
(Toggle it to N and back to Y.)
4.6 The Analyze Function
Normally, all of the functions automatically switch back to the
Analyze function when they have completed their assigned operations.
Pressing the ESCAPE button in many cases also switches the analyzer
back to the Analyze function. Alternatively, you can press the
ANALYZE button at any time to return to analyzing your sample.
4.7 Signal Output
The standard Model 2120XL Analyzer is equipped with two 0–1
VDC analog output terminals accessible on the back panel (one
concentration and one range ID), and two isolated 4–20 mA DC current
outputs (one concentration and one range ID).
See Rear Panel in Chapter 3, Installation, for illustration.
The signal output for concentration is linear over the currently
selected analysis range. For example, if the analyzer is set on range that
was defined as 0–100 ppm N2, then the output would be:
ppm
N2
0
Voltage Signal
Output (VDC)
0.0
Current Signal
Output (mA dc)
4.0
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Trace Nitrogen in Argon Analyzer
10
20
30
40
50
60
70
80
90
100
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
Operation
5.6
7.2
8.8
10.4
12.0
13.6
15.2
16.8
18.4
20.0
The analog output signal has a voltage which depends on the
nitrogen concentration AND the currently activated analysis range. To
relate the signal output to the actual concentration, it is necessary to
know what range the instrument is currently on, especially when the
analyzer is in the auto-ranging mode.
To provide an indication of the range, a second pair of analog
output terminals are used. They generate a steady preset voltage (or
current when using the current outputs) to represent a particular range.
The following table gives the range ID output for each analysis range:
Range
Voltage (V)
Current (mA)
LO
0.25
8
MED
0.50
12
HI
0.75
16
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Operation
Model 2120XL
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Trace Nitrogen in Argon Analyzer
Maintenance
Maintenance
CAUTION:
MAINTENANCE AND REPAIR OF THE MODEL
2120XL ANALYZER INVOLVE POTENTIALLY
HAZARDOUS PROCEDURES. ONLY TRAINED AND
QUALIFIED PERSONNEL WHO HAVE READ AND
UNDERSTOOD THE INSTRUCTIONS IN THIS
MANUAL SHOULD WORK ON THIS EQUIPMENT.
5.1 Routine Maintenance
Aside from normal cleaning and checking for leaks at the gas
connections, routine maintenance consists of recalibration and periodic
inspection of essential analyzer parts. For calibration procedures, refer to
Section 4.5.2. The periodic inspection of analyzer parts helps ensure
continuing high performance and reduces malfunctions that could lead
to analyzer downtime.
5.2 Routine Maintenance Schedule
Perform a routine calibration of the analyzer at least once every one to
two weeks. Keep a log of the percentage zero and percentage span
deviation settings. This ensures not only that accuracy is maintained; it
also may help in troubleshooting the analyzer if these settings vary
widely at each calibration or vary consistently up or down scale. If the
readings are stable from calibration to calibration, then the frequency of
routine calibrations can be decreased accordingly.
Check the sample flow rate at least every one to two weeks. Use the
Flow function from the System menu to check and adjust the sample
flow rate to approximately 100 ccm.
Check for excessive accumulation of dirt. In dusty locations, you may
need to wipe or gently blow off dust from the various sections at least
once a week. Any accumulation of dust or oil film hinders satisfactory
operation.
On an annual basis, check the gas lines for signs of leaks.
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Maintenance
Model 2120XL
Table 5-1 summarizes the recommended routine maintenance
required for the Model 2120XL.
Table 5-1: Routine Maintenance Schedule
Maintenance Task
Time Schedule
Calibrate
Every 1-2 weeks
Check sample gas flow rate
Every 1-2 weeks
Check for excessive accumulation of dirt
Weekly
Check gas lines for leaks
Yearly
5.3 Fuse Replacement
1. Place small screwdriver in notch, and pry cover off, as shown
in Figure 5-1.
Figure 5-1: Removing Fuse Block from Housing
2. To change between American and European fuses, remove
the single retaining screw, flip Fuse Block over 180 degrees,
and replace screw.
3. Replace fuse as shown in Figure 5-2.
4. Reassemble Housing as shown in Figure 5-1.
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Trace Nitrogen in Argon Analyzer
American Fuses
Maintenance
European Fuses
Figure 5-2: Installing Fuses
5.4 System Self Diagnostic Test
1. Press the System button to enter the system mode.
2. Use the ◄► arrow keys to move to More, and press Enter.
3. Use the ◄► arrow keys to move to Self-Test, and press
Enter.
The following failure codes apply:
Power: Tests the sample 5V and 15V power supplies
0
1
2
3
OK
5 V Failure
15 V Failure
Both Failed
Analog: Set non-zero sample on analog output channel 1 (% of range)
and channel 2 (Range ID) and sample response.
0
1
2
3
OK
Analog channel 1 (% of Range) is incorrect
Analog channel 1 (Range ID) is incorrect
Both channels are incorrect
Preamp: A) Tests the bypass sensor input.
B) Sets a zero level on preamp then tests response.
C) Sets a non-zero livel on preamp then tests response.
0
1
2
3
OK
Preamp is incorrect at zero level
Preamp is incorrect at non-zero level
Both zero and non-zero are incorrect
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Maintenance
Model 2120XL
5.5 Error Screens
Additional errors are indicated by a flashing ‘E’ at the upper right
corner of the analyzer display screen.
If 'E' is flashing in the upper right hand corner, the instrument has
detected an error. Go to menu item 'Err' and press ENTER. If there are
errors, they will be listed on the screen'.
Use the UP/DOWN to scroll through the errors. Press ENTER to
dispatch the current error. If the error condition still persists, the flashing
‘E’ will return.
Any of the following errors will cause the system alarm to trigger.
These are non-latching so when all alarms have been dispatched (if
possible), the system alarm will be cease.
LED Display Error 0x0001
"LED Display Error "
This indicates a problem with the LED interface. Contact TAI
Flow Error 0x0002
"Flow Error "
Flow control system has problems and cannot control the flow.
This may be a temporary self-correcting error. If it persists, contact TAI.
Negative Flow Error 0x0004
"Neg. Flow Adc Error "
The flow sensing system has a problem. This may be a temporary
self-correcting error. If it persists, contact TAI.
Zero Fail 0x0020
"Zero Fail "
The auto-settled zero calibration could not be completed within 1/2
hour. This indicates most likely that the input signal is too noisy.
SysTest5V 0x0080
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Trace Nitrogen in Argon Analyzer
Maintenance
"Sys Test -- 5V "
The system test on the 5V power supply has found a problem.
SysTest15V 0x0100
"Sys Test -- 15V "
The system test on the 15V power supply has found a problem.
SysTest Analog 1 0x0200
"Sys Test DAC A "
The system test on analog channel 1 (% of range) is incorrect.
SysTest Analog 2 0x0400
"Sys Test DAC B "
The system test on analog channel 2 (Range ID) is incorrect
SysTestPreamp_0_0V 0x0800
"Sys Test Preamp 0.0V"
The system test on the preamp is incorrect at the zero level.
SysTestPreamp_0_7V 0x1000"Sys Test Preamp 0.7V"
The system test on the preamp is incorrect at the non-zero level
InvLinearErr 0x4000
"Linearization Error "
The dataset for linearization could not be processed. Most likely,
two linearization outputs have been set for the same input.
5.6 Sensor Replacement
While it is possible to replace a sensor in the field, TAI
recommends that the analyzer be shipped back to the factory for sensor
replacement and requalification. If the sensor is replaced in the field, the
customer must contact TAI Customer Service to obtain the required
input data to linearize the new sensor.
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Maintenance
Model 2120XL
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Trace Nitrogen in Argon Analyzer
Appendix
Appendix
A.1 Specifications
Detector: Plasma Emission Detector with Duty
Controlled System
Measurement Ranges: 3 user programmable ranges from 0-1 ppm
to 0-100 ppm.
Output: 4-20 mA and 0-1 vdc, concentration and
Range ID
Sample Flowrate: adjustable 15-200 sccm, 100 ccm default
for optimal operation
Zero Cal. Gas: Through Scrubber TAI P/N S1748
Span Cal. Gas: 70-100 ppm N2 in Ar
Flow Accuracy: 0 to 200 sccm ± 1% full scale
Operating Temperature: 32-104°F (0-40°C)
Operating Pressure: 4-20 psig (27.6 – 138 kPa)
Power Required: 85-240 VAC 50/60 Hz, 60 W
Sample Connections: 1/8” tube fittings
Accuracy: ± 1% full scale (0-100 ppm)
Alarms: Two programmable concentration alarms,
and a system alarm. Relay contacts ‘C’
type
Range ID contacts: Relay contacts ‘A’ type
Digital Output: RS232 at 9600 baud rate, RS232 output is
compatible with VB-1/VB-3 for profibus
communication
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Appendix
Model 2120XL
Digital Inputs: Two digital inputs for remote span and
zero
Weight: 35 lbs (15.9 kg)
A.2 Recommended Replacement Parts List
Qty.
Part Number
Description
1
C75825A
Main PCB w/o EPROM
1
C84447A
Amplifier PCB
1
C84132A
Back Panel Power Supply PCB
1
C84129A
Front Panel Display PCB
1
S01748-120
Scrubber of N2 Gas for zero cal. (120 V)
-OR-
1
S01748-240
Scrubber of N2 Gas for zero cal. (240 V)
1
F2374
Flow Control Module
1
A85552
2120XL std. EPROM for Main PCB
Note: Orders for replacement parts should include the part
number (if available) and the model and serial number of
the instrument for which the parts are intended.
Orders should be sent to:
TELEDYNE ANALYTICAL INSTRUMENTS
16830 Chestnut Street
City of Industry, CA 91748
Telephone: (626) 934-1500
Fax: (626) 961-2538
Web: www.teledyne-ai.com
or your local representative.
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Trace Nitrogen in Argon Analyzer
Appendix
A.3 Drawing List
D84123
C85455
C85454
Outline Drawing
Internal Piping Drawing
Wiring Diagram
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