Kaye LTR -25/140 and LTR -40/ 140

GE
Measurement & Control
Validation
Kaye LTR -25/140 and LTR -40/
140
User’s Manual
M4374 Rev. D
April 2013
GE
Measurement & Control
Kaye LTR -25/140 and LTR -40/
140
Memory Card for Data Backup
User’s Manual
M4374 Rev. D
April 2013
http://www.ge-mcs.com/en/validation-and-environmental-monitoring.html
©2013 General Electric Company. All rights reserved.
Technical content subject to change without notice.
Contents
Chapter 1. Before You Start
1.1 Symbols Used . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.2 Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2.1 Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2.1 Cautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.2.1 Customer Service Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Chapter 2. Specifications and Environmental Conditions
2.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.2 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.2.1 Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.2.2 Accuracy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.2.3 Stability. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.2.4 Well to Well Uniformity (calibration wells) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.2.5 Well Depth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.2.6 Heating Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.2.7 Cooling Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.2.8 Test Wells . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.2.9 Resolution. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.2.10 Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.2.11 Size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.2.12 Weight. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.2.13 Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.2.14 Operating Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.2.15 Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.2.16 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.2.17 Fault Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.2.18 Fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.2.19 Transfer Calibration Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.3 Environmental Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.3.1 Customer Site Assistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
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Contents
Chapter 3. Quick Start
3.1 Unpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.2 Setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.3 Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
3.4 Setting the Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Chapter 4. Parts and Controls
4.1 Rear Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.2 Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.3 Constant Temperature Block Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.3.1 Constant Temperature Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Chapter 5. General Operation
5.1 Calibrator Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
5.2 Switching Voltage Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
5.3 Setting the Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
5.4 Calibrating Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
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Contents
Chapter 6. Controller Operation
6.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
6.2 Well Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
6.3 Reset Cutout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
6.4 Temperature Set-point . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
6.4.1 Programmable Set-points (Set-point Memory) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
6.4.2 Set-point Value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
6.5 Set-point Resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
6.6 Ramp and Soak Program Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
6.6.1 Number of Program Set-points. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
6.6.2 Set-points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
6.6.3 Program Soak Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
6.6.4 Program Function Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
6.6.5 Program Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
6.7 Secondary Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
6.8 Heating Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
6.9 Proportional Band . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
6.10Cutout. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
6.11Controller Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
6.11.1 Probe Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
6.11.1aR0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
6.11.1bALPHA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
6.11.1cDELTA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
6.11.1dBETA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
6.11.2 Operating Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
6.11.2aTemperature Scale Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
6.11.2bCutout Reset Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
6.11.3 Serial Interface Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
6.11.3aBAUD Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
6.11.3bSample Period . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
6.11.3cDuplex Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
6.11.3dLinefeed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
6.11.4 Calibration Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
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6.11.4aCTO. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
6.11.4bBO and BG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
6.11.4cSCO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Chapter 7. Calibration Procedure
7.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
7.2 Calibration Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
7.3 Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Chapter 8. Maintenance
8.1 Maintenance Guidelines. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Chapter 9. Troubleshooting
9.1 Troubleshooting Problem Conditions and Solutions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
9.2 Comments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
9.2.1 EMC Directive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
9.2.2 Low Voltage Directive (Safety) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
9.2.3 Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
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Kaye LTR -25/140 and LTR -40/140 User’s Manual
Chapter 1. Before You Start
Chapter 1.
Before You Start
1.1 Symbols Used
Table 1 below lists the symbols used on the instrument or in this manual and the meaning
of each symbol.
Table 1: International Electrical Symbols
Symbol
Description
AC (Alternating Current)
AC-DC
Battery
Complies with European Union directives
DC
Double Insulated
Electric Shock
Fuse
PE Ground
Hot Surface (Burn Hazard)
Read the User’s Manual -- Important Information
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Chapter 1. Before You Start
Table 1: International Electrical Symbols (Continued)
Symbol
Description
Off
On
Canadian Standards Association
OVERVOLTAGE (Installation) CATEGORY II, Pollution Degree 2
per IEC1010-1 refers to the level of Impulse Withstand Voltage
protection provided. Equipment of OVERVOLTAGE CATEGORY II
is energy-consuming equipment to be supplied from the fixed
installation. Examples include household, office, and laboratory
appliances.
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Kaye LTR -25/140 and LTR -40/140 User’s Manual
Chapter 1. Before You Start
1.2 Safety Information
Use this instrument only as specified in this manual. Otherwise, the protection provided by
the instrument may be impaired. Refer to the safety information in the “Warnings” and
“Cautions” sections below.
The following definitions apply to the terms “Warning” and “Caution”.
“Warning” identifies conditions and actions that may pose hazards to the user.
“Caution” identifies conditions and actions that may damage the instrument being used.
1.2.1 Warnings
To avoid personal injury, follow these guidelines:
!BURN HAZARD!
DO NOT touch the well access surface of the instrument.
The temperature of the well access is the same as the actual display
temperature, e.g. if the instrument is set to 140°C and the display
reads 140°C, the well is at 140°C.
The top sheet metal of the dry-well may exhibit extreme
temperatures for areas close to the well access.
The air over the well can reach temperatures greater that 100°C for
high temperature (140°C and higher) dry-wells. Note: Probes and
inserts may be hot and should only be inserted and removed from the
instrument when the instrument is set at temperatures less than
50°C. Use extreme care when removing hot inserts.
!BURN HAZARD!
DO NOT turn off the instrument at temperatures higher than 100°C.
This could create a hazardous situation. Select a set-point less than
100°C and allow the instrument to cool before turning it off.
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Chapter 1. Before You Start
1.2 Warnings (cont.)
WARNING! DO NOT operate this instrument without a properly grounded,
properly polarized power cord. DO NOT connect this instrument to a
non-grounded, non-polarized outlet.
DO NOT use this instrument in environments other than those listed
in the User’s Guide.
Follow all safety guidelines listed in the User’s Guide.
Calibration Equipment should only be used by Trained Personnel.
Before initial use, after transport, and any time the dry-well has not
been energized for more than 10 days, the instrument needs to be
energized for a “dry-out” period of 1-2 hours before it can be assumed
to meet all of the safety requirements of IEC 1010-1.
Always replace the power cord with an approved cord of the correct
rating and type.
HIGH VOLTAGE is used in the operation of this equipment. SEVERE
INJURY or DEATH may result if personnel fail to observe safety
precautions.
Before working inside the equipment, turn power off and disconnect
power cord.
DO NOT use this instrument for any application other than calibration
work.
DO NOT turn the instrument upside down with the inserts in place;
the inserts will fall out.
DO NOT operate near flammable materials.
Use of this instrument at HIGH TEMPERATURES for extended periods
of time requires caution.
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Chapter 1. Before You Start
1.2 Warnings (cont.)
WARNING! Completely unattended operation is not recommended for safety
reasons.
Always replace the fuse with one of the same rating, voltage and type.
Overhead clearance is required. DO NOT place the instrument under a
cabinet or other structure. Always leave enough clearance above the
instrument to allow for safe and easy insertion and removal of
probes.
If the instrument is used in a manner not in accordance with the
equipment design, the operation of the dry-well may be impaired or
safety hazards may arise.
The block vent may be very hot due to the fan blowing across the
heater block of the dry-well.
This instrument is intended for indoor use only.
Always operate this instrument at room temperature between 41°F
and 122°F (5°C to 50°C). Allow sufficient air circulation by leaving at
least 10 inches (25.4 cm) of clearance around the instrument.
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Chapter 1. Before You Start
1.2.1 Cautions
CAUTION!
Component lifetime can be shortened by continuous high
temperature operation.
Most probes have handle temperature limits. Be sure that the probe
handle temperature limit is not exceeded in the air above the
instrument.
DO NOT use fluids to clean out the well.
Never introduce any foreign material into the probe hole of the insert.
Fluids, etc. can leak into the instrument, causing damage.
DO NOT change the values of the calibration constants from the
factory set values. The correct setting of these parameters is
important to the safety and proper operation of the calibrator.
DO NOT slam the probe stems in to the well. This type of action can
cause a shock to the sensor and affect the calibration.
The instrument and any thermometer probes used with it are
sensitive instruments that can be easily damaged. Always handle
these devices with care. DO NOT allow them to be dropped, struck,
stressed, or overheated.
The master reset sequence should be performed only by authorized
personnel if no other action is successful in correcting a malfunction.
You must have a copy of the most recent Report of Calibration to
restore the calibration parameters.
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Chapter 1. Before You Start
1.2 Cautions (cont.)
CAUTION!
DO NOT operate this instrument in an excessively wet, oily, dusty, or
dirty environment.
Always keep the well and inserts clean and clear of foreign material.
The dry-well is a precision instrument. Although it has been designed
for optimum durability and trouble free operation, it must be handled
with care. Always carry the instrument in an upright position to
prevent the probe sleeves from dropping out. The convenient fold-up
handle allows one hand carrying.
If a mains supply power fluctuation occurs, immediately turn off the
instrument.
Power bumps from brown-outs could damage the instrument. Wait
until the power has stabilized before re-energizing the instrument.
1.2.1 Customer Service Information
When contacting GE Measurement & Control Customer Service, please have the
following information available:
•
Model Number
•
Serial Number
•
Voltage
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Chapter 1. Before You Start
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Kaye LTR -25/140 and LTR -40/140 User’s Manual
Chapter 2. Specifications and Environmental Conditions
Chapter 2.
Specifications and Environmental
Conditions
2.1 Introduction
The Kaye Low Temperature References (LTR–25/140 and LTR–40/140) provide a stable,
portable temperature reference for performing thermocouple calibration. The LTR–25/140
operates over the range of –25°C to 140°C. The LTR–40/140 operates over the range of
–40°C to 140°C.
The LTR is most commonly used with GE’s Intelligent RTD (IRTD) probe and Kaye
Validator to make up a complete validation system. The LTR has the ability to rapidly heat
and cool, making it an ideal instrument for performing multiple-point calibrations for a
variety of processes, such as freeze dryer, cold rooms, incubators and steam sterilizers.
The LTR has six wells for sensors and two wells for IRTD probes. For calibrating
thermocouples, there are inserts that go into each well to reduce stem conduction errors,
thereby providing maximum accuracy and stability. With inserts installed, each of the six
sensor wells can hold up to three type 28 or 22 gauge PTFE thermocouples, for a total of
18 thermocouples.
The Kaye Validator automatically performs the sensor calibration, including programming
the set-point temperatures at the LTR. If you are using the LTR as a standalone instrument,
the temperatures can be manually set to any temperature within the specified range by
using the four control buttons located on the front panel.
The calibrator controller uses a precision platinum RTD as a sensor and controls the well
temperature with thermoelectric modules. The LED front panel display continuously
shows the current well temperature.
These dry-well calibrators are designed for portability, moderate cost, and ease of
operation. With proper use they should provide continued accurate calibration of
temperature sensors and devices. The user should be familiar with the safety guidelines
and operating procedures of the calibrator as described in this User’s Guide.
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Chapter 2. Specifications and Environmental Conditions
2.2 Specifications
The following section lists the specifications for this instrument. Accuracy specifications
are applicable for a one-year calibration interval. In line with normal prudent metrology
practices, a short-cycle interval of six months is recommended for new units during the
first year.
2.2.1 Range
LTR–25/140
LTR–40/140
–25°C to 140°C
–40°C to 140°C
(–32°C to 284°F)
(–40°F to 285°F)
at 23°C (73°F)
at 23°C (73°F)
2.2.2 Accuracy
±0.2°C (0.36°F)
2.2.3 Stability
0.02°C (0.06°F)
2.2.4 Well to Well Uniformity (calibration wells)
±0.05°C (0.09°F) within 25°C of ambient
2.2.5 Well Depth
6” (152 mm)
2.2.6 Heating Time
15 minutes: 25°C to 140°C
2.2.7 Cooling Time
10 minutes: 25°C to –20°C
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Chapter 2. Specifications and Environmental Conditions
2.2.8 Test Wells
Two 1/4” dia., six 9 mm dia.
2.2.9 Resolution
0.01°C or 0.01°F
2.2.10 Display
LED, °C or °F, user selectable
2.2.11 Size
13” H x 7.8” W x 11.9” D (342 x 198 x 302 mm)
2.2.12 Weight
30 lb. (13.6 kg)
2.2.13 Power
115 VAC (±10%), 3 A, 50/60 Hz, 230 VAC (±10%),
1.5 A, 50/60 Hz, 350 watts
2.2.14 Operating Range
5–50°C (41–122°F)
2.2.15 Controller
Hybrid analog/digital controller with data retention
2.2.16 Safety
OVERVOLTAGE (Installation) CATEGORY II, Pollution Degree 2 per IEC1010-1
2.2.17 Fault Protection
Sensor burnout protection, over-temperature cutout, and electrical fuses
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Chapter 2. Specifications and Environmental Conditions
2.2.18 Fuses
LTR–25/140
LTR–40/140
115V - 3A T, 250 V
115V - 4A T, 250 V
230V - 1.6A T, 250 V
230V - 3.15A T, 250 V
2.2.19 Transfer Calibration Accuracy
(Transfer calibration accuracy of thermocouples to IRTD probe at 25°C with inserts,
excluding probe uncertainty)
22 Gauge Wire
12
27 Gauge Wire
0.25°C from –40 to –25°C
0.15°C from –40 to –25°C
0.2°C from –25 to 80°C
0.1°C from –25 to 80°C
0.1°C from 0 to 50°C
0.15°C from 80 to 121.1°C
0.4°C from 80 to 140°C
0.18°C from 121.1 to 140°C
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Chapter 2. Specifications and Environmental Conditions
2.3 Environmental Conditions
Although these instruments have been designed for optimum durability and trouble-free
operation, they must be handled with care. The instrument should not be operated in an
excessively dusty or dirty environment. Maintenance and cleaning recommendations can
be found in Chapter 8, Maintenance.
The instrument operates safely under the following conditions:
•
temperature range 5 - 50°C (41 - 122°F)
•
ambient relative humidity 15 - 50%
•
pressure - 75 kPa - 106 kPa
•
mains voltage within ±10% of nominal
•
vibrations in the calibration environment should be minimized
•
altitude less than 2,000 meters
•
indoor use only
2.3.1 Customer Site Assistance
GE Measurement & Control can provide optional on-site assistance with installation,
initial operation, and training of plant personnel. Contact the Customer Service
Department for details.
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Chapter 2. Specifications and Environmental Conditions
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Chapter 3. Quick Start
Chapter 3.
Quick Start
3.1 Unpacking
Unpack the dry-well carefully and inspect it for any damage that may have occurred
during shipment. If there is shipping damage, notify the carrier immediately.
Verify that the following components are present:
•
LTR–25/140 or LTR–40/140
•
Thermocouple Insert, GE Part number J6520, 6 ea.
•
Power Cord
•
User's Guide
•
Certificate of Calibration
•
Serial Cable
3.2 Setup
Place the calibrator on a flat surface with at least 10 inches of free space around the
instrument. Overhead clearance is required. DO NOT place under a flammable structure
or cabinet. Plug the power cord into a grounded mains outlet. Observe that the nominal
voltage corresponds to that indicated on the back of the calibrator.
Turn on the power to the calibrator by toggling the switch on the power entry module. The
fan should begin blowing air through the instrument and the controller display should
illuminate after 3 seconds. After a brief self-test, the controller should begin normal
operation. If the unit fails to operate, please check the power connection.
The display begins to show the well temperature and the well heater starts operating to
bring the temperature of the well to the set-point temperature.
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Chapter 3. Quick Start
3.3 Power
Plug the dry-well power cord into a mains outlet of the proper voltage, frequency, and
current capability. See Specifications (page 10) for power details. Turn the dry-well on
using the rear panel POWER switch. The dry-well turns on and begins to heat to the
previously programmed temperature set-point. The front panel LED display indicates the
actual dry-well temperature.
These instruments are field switchable between 115 V and 230 V. Refer to Switching
Voltage Operation (page 23), for information on switching the voltage.
3.4 Setting the Temperature
When you calibrate thermocouples using the LTR and the Kaye Validator, the set-points
are defined as part of the calibration procedure and automatically downloaded from the
Kaye Validator to the LTR. If you are using the LTR as a standalone instrument, Chapter 6
(page 30) explains in detail how to set the temperature set-point on the calibrator using the
front panel keys. The procedure is summarized here.
1. Press SET twice to access the set-point value.
2. Press UP or DOWN to change the set-point value.
3. Press SET to program in the new set-point.
4. Press EXIT to return to the temperature display.
When the set-point temperature is changed, the controller switches the well heater on or
off to raise or lower the temperature. The displayed well temperature gradually changes
until it reaches the set-point temperature. The well may require 5 to 10 minutes to reach
the set-point depending on the span. Another 5 to 10 minutes is required to stabilize with
±0.1°C of the set-point. Ultimate stability may take 15 to 20 minutes more of stabilization
time.
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Chapter 4. Parts and Controls
Chapter 4.
Parts and Controls
4.1 Rear Panel
Users should become familiar with the dry well calibrator and its parts. See Figures
Figure 1 (below) and 2 (on the next page).
Power Cord - At the rear of the calibrator is the removable power cord that plugs into a
standard 115 VAC grounded socket. (230 VAC optional.)
Power Entry Module (LTR–40/140) - The power switch is located on the power entry
module (PEM). The PEM also houses the fuses.The supply voltage for the unit is indicated
on the PEM.
Power Switch (LT –25/140) - The power switch is located on the left corner of the rear
panel.
Figure 1: LTR –40/140 Back Panel
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Chapter 4. Parts and Controls
4.1 Rear Panel (cont.)
Figure 2: LTR –25/140 Back Panel
Serial Port - This D-9 connector is for interfacing the calibrator to a computer or terminal
with serial RS-232 communications.
Fuse Holders (LTR –25/140) - At the rear of the calibrator are two user accessible fuse
holders.
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Chapter 4. Parts and Controls
4.2 Front Panel
See Figure 3 below.
Controller Display - The digital display is an important part of the temperature controller
because it not only displays set and actual temperatures but also various calibrator
functions, settings, and constants. The display shows temperatures in units according to
the selected scale °C or °F.
Controller Keypad - The four button keypad allows easy setting of the set-point
temperature. The control buttons (SET, DOWN, UP, and EXIT) are used to set the
calibrator temperature set-point, access and set other operating parameters, and access and
set calibration parameters.
Setting the control temperature is done directly in degrees of the current scale. It can be set
to one-hundredth of a degree Celsius.
Figure 3: Front Panel
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Chapter 4. Parts and Controls
4.2 Front Panel (cont.)
The functions of the buttons are as follows:
•
SET – Used to display the next parameter in the menu and to set parameters to the
displayed value.
•
DOWN – Used to decrement the displayed value of parameters.
•
UP – Used to increment the displayed value.
•
EXIT – Used to exit from a menu. When EXIT is pressed, any changes made to the
displayed value will be ignored.
Control Indicator - The Control Indicator is a two color light emitting diode. This
indicator lets the user visually see the ratio of heating to cooling. When the indicator is
constant red, the well is heating, and when it is constant green, the well is cooling. When
the indicator is flashing, then the temperature is being held constant.
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Chapter 4. Parts and Controls
4.3 Constant Temperature Block Assembly
4.3.1 Constant Temperature Block
The block (Figure 4 below) is made of aluminum and provides a relatively constant and
accurate temperature environment in which the sensors that are to be calibrated are
inserted. Attached to the block are Peltier thermoelectric modules which heat or cool the
block to maintain a constant temperature. A high-quality platinum RTD is imbedded in the
block to sense the temperature and provide feedback to the temperature controller.
Figure 4: Temperature Block
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Chapter 4. Parts and Controls
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Chapter 5. General Operation
Chapter 5.
General Operation
5.1 Calibrator Setup
Place the calibrator on a flat surface with at least 10 inches of free space around the
instrument. DO NOT place under a flammable structure or cabinet. Plug the power cord
into a grounded mains outlet. Observe that the nominal voltage corresponds to that
indicated on the back of the calibrator.
Gently insert the thermocouple probe sleeves into the well. Sleeves of various sizes are
available from the manufacturer. The well must be clear of any foreign objects, dirt, and
grit before the sleeve is inserted. The sleeve is inserted with the two small tong holes
positioned upward.
Turn on the power to the calibrator by toggling the switch at the rear of the instrument to
the “l” (on) position. The fan begins circulating air through the instrument. After a brief
self test, the controller should begin normal operation, showing the well temperature. The
block will heat or cool until it reaches the programmed set-point.
5.2 Switching Voltage Operation
The Voltage of the instrument cannot be changed by the customer/user - but the instrument
needs to be returned to the Service Center for voltage change.
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Chapter 5. General Operation
5.3 Setting the Temperature
Temperature Set-point on page 30 explains in detail how to set the temperature set-point
on the calibrator using the front panel keys. The procedure is summarized here.
1. Press SET twice to access the set-point value.
2. Press UP or DOWN to change the set-point value.
3. Press SET to program in the new set-point.
4. Press EXIT to return to the temperature display.
When the set-point temperature is changed, the controller switches the well heater on or
off to raise or lower the temperature. The cycle indicator, a two color LED, indicates on
(red and heating) or off (green and cooling). The displayed well temperature gradually
changes until it reaches the set-point temperature.
The well may require 5 to 20 minutes to reach the set-point, depending on the span.
Another 5 to 10 minutes is required for the temperature to stabilize.
5.4 Calibrating Sensors
Sensor calibration is performed prior to carrying out a validation test to correct raw
temperature readings to a traceable temperature measurement standard. Due to the LTR’s
range of temperature and rapid heating and cooling capabilities, the instrument can be
used to provide calibrations for a variety of validation processes. To provide maximum
accuracy, a two-point calibration should be performed close to the operating temperature
of the process.
The Kaye Validator automatically downloads the calibration set-points defined in your
setup to the LTR and controls the entire sensor calibration procedure.
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Chapter 5. General Operation
5.4 Calibrating Sensors (cont.)
Before you begin the calibration process:
•
Place the Validator in a location with stable and even temperature, not exposed to any
local heat sources (i.e., close to a sterilizer, an open door causing a draft, etc.)
•
To provide maximum accuracy during the calibration process, power up the Validator
and let it run for approximately 30 minutes in the operating environment where
calibration is to be performed in order for the Validator to acclimate to the ambient
temperature.
•
Since transient environmental temperature will cause thermal measurements to
change, GE specifies that the Validator system be allowed to stabilize for at least 30
minutes for every 10°C change in temperature. For example, if you move the
Validator from a 25°C environment to a 40°C degree environment, it should be
allowed to run for 45 minutes before use.
•
Place the thermocouples and IRTD into the LTR, making sure to use the well inserts to
insert the thermocouples. The LTR provides the stable temperature required for sensor
calibration. The IRTD, a self-contained precision measurement standard that provides
data directly to the Validator, accurately measures the temperature of the LTR. The
IRTD provides a traceable standard that is used to correct the temperature readings of
your thermocouples.
For more detailed information on the hardware connections and the sensor calibration
process, refer to the Kaye Validator User’s Guide.
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Chapter 5. General Operation
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Chapter 6. Controller Operation
Chapter 6.
Controller Operation
6.1 Introduction
This chapter discusses in detail how to operate the dry-well temperature controller using
the front panel. Using the front panel key-switches and LED display, the user may monitor
the well temperature, set the temperature set-point in degrees C or F, monitor the heater
output power, adjust the controller proportional band, set the cutout set-point, and program
the probe calibration parameters, operating parameters, serial interface configuration, and
controller calibration parameters. Function operation is summarized in Figure 5 on
page 29.
In the following discussion a solid box around the word SET, UP, EXIT or DOWN
indicates the panel button, while the dotted box indicates the display reading. Explanation
of the button or display reading are to the right of each button or display value.
6.2 Well Temperature
The digital LED display on the front panel allows direct viewing of the actual well
temperature. This temperature value is what is normally shown on the display.
The units, C or F, of the temperature value are displayed at the right. For example,
Well Temperature in Degrees Celsius
The temperature display function may be accessed from other functions by pressing the
EXIT button.
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Chapter 6. Controller Operation
6.3 Reset Cutout
The cutout has two modes, automatic reset and manual reset (see page 40) and determines
how the cutout resets, allowing the instrument to heat up again. When in automatic mode,
the cutout resets itself as soon as the temperature is lowered below the cutout set-point.
With manual reset mode, the cutout must be reset by the operator after the temperature
falls below the set-point.
If the over-temperature cutout has been triggered, the temperature display alternately
flashes:
Indicates Cutout Condition
The message continues to flash until the temperature is reduced and the cutout is reset.
When the cutout is active and the cutout mode is set to manual (“reset”) the display flashes
“cutout” until the user resets the cutout. To access the reset cutout function, press the SET
button.
Access Cutout Reset Function
The display indicates the reset function.
Cutout Reset Function
Press SET once more to reset the cutout.
Reset Cutout
This switches the display to the set temperature function. To return to displaying the
temperature, press the EXIT button. If the cutout is still in the over-temperature fault
condition, the display continues to flash “cutout”. The well temperature must drop a few
degrees below the cutout set-point before the cutout can be reset.
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Chapter 6. Controller Operation
Figure 5: Controller Function Flowchart
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Chapter 6. Controller Operation
6.4 Temperature Set-point
The temperature set-point can be set to any value within the range and with resolution as
given in the specifications. Be careful not to exceed the safe upper temperature limit of
any device inserted into the well. The safety cutout must be adjusted to prevent this
occurrence.
Setting the temperature involves two steps: (1) selecting the set-point memory and (2)
adjusting the set-point value.
6.4.1 Programmable Set-points (Set-point Memory)
The controller stores 8 set-point temperatures in memory. The set-points can be quickly
recalled to conveniently set the calibrator to a previously programmed temperature setpoint.
To set the temperature, select the set-point memory and then adjust the set-point value.
This function is accessed from the temperature display function by pressing SET. The
number of the set-point memory currently being used is shown at the left on the display
followed by the current set-point value.
Well Temperature in Degrees Celsius
Access Set-point Memory
Set-point Memory 1,
20.0°C Currently Used
To change the set-point memory, press UP or DOWN.
New Set-point Memory 3, –10.0°C
Press SET to accept the new selection and access the set-point value.
Accept Selected Set-point Memory
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Chapter 6. Controller Operation
6.4.2 Set-point Value
The set-point value may be adjusted after selecting the set-point memory and pressing
SET. It is displayed with the units, C or F, at the left.
Set-point 3 Value in °C
If the set-point value does not need to be changed, press EXIT to resume displaying the
well temperature. Press UP or DOWN to adjust the set-point value.
New Set-point Value
When the desired set-point value is reached, press SET to accept the new value and access
the temperature scale units selection. If EXIT is pressed, then any changes made to the setpoint are ignored.
Accept New Set-point Value
6.5 Set-point Resistance
To display the Set-point Resistance, press SET and DOWN simultaneously when the
temperature is displayed. When the SET and DOWN buttons are released, the temperature
is again displayed. This value is used to calibrate the instrument and is not adjustable.
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Chapter 6. Controller Operation
6.6 Ramp and Soak Program Menu
The ramp and soak program feature allows the user to program a number of set-points and
have the dry-well automatically cycle between the temperatures, holding at each for a
determined length of time. The user can select one of four different cycle functions.
The program parameter menu is accessed by pressing SET and then UP.
Well Temperature
Access Program Menu
Program Menu
Press SET to enter the program menu.
Enter Program Menu
6.6.1 Number of Program Set-points
The first parameter in the program menu is the number of set-points to cycle through. Up
to 8 set-points can be used in a ramp and soak program.
Number of Program Set-points
Use the UP or DOWN buttons to change the number from 2 to 8.
New Number of Program Set-points
Press SET to continue. Pressing EXIT will cause any changes made to the parameter to be
ignored.
Save New Setting
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Chapter 6. Controller Operation
6.6.2 Set-points
The next parameters are the program set-points.
First Set-point
Use the UP or DOWN buttons to select any of the 8 set-points.
Third Set-point
Press SET to change the set-point.
Set-point Value
Use UP and DOWN to change the set-point value.
New Set-point Value
Press SET to save the new set-point value.
The other set-points can also be set in the same manner. Once the set-points are
programmed as desired, press EXIT to continue.
Continue to Next Menu Function
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Chapter 6. Controller Operation
6.6.3 Program Soak Time
The next parameter in the program menu is the soak time. This is the time, in minutes, that
each of the program set-points is maintained after settling before proceeding to the next
set-point. The duration is counted from the time the temperature settles to within a
specified stability.
Soak Time in Minutes
Use the UP or DOWN buttons to change the time.
New Soak Time
Press SET to continue.
Save New Setting
6.6.4 Program Function Mode
The next parameter is the program function or cycle mode. There are four possible modes.
They determine whether the program scans up (from set-point 1 to n) only or both up and
down (from set-point 1 to n and back from set-point n to 1), and also whether the program
stops after one cycle or repeat the cycle indefinitely.
Table 2 below shows the action of each of the four program mode settings.
Table 2: Program Mode Settings
Function
Action
34
1
up-stop
2
up-down-stop
3
up-repeat
4
up-down-repeat
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Chapter 6. Controller Operation
6.6.4 Program Function Mode (cont.)
Program Mode
Use the UP or DOWN buttons to change the mode.
New Mode
Press SET to continue.
Save New Setting
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Chapter 6. Controller Operation
6.6.5 Program Control
The final parameter in the program menu is the control parameter. The control options are
to start the program from the beginning, continue the program from where it was when it
was stopped, or stop the program.
Program Presently Off
Use the UP or DOWN buttons to change the status.
Start Cycle from Beginning
Press SET to activate the new program control command and return to the temperature
display.
Activate New Command
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Chapter 6. Controller Operation
6.7 Secondary Menu
Functions which are used less often are accessed within the secondary menu. (The
secondary menu is accessed by pressing SET and EXIT simultaneously and then
releasing.) The first function in the secondary menu is the heater power display.
6.8 Heating Power
The temperature controller controls the temperature of the well by heating or cooling the
well with the thermoelectric modules. The amount of heating or cooling power depends on
the temperature set-point of the well. This heating (or cooling) power value may be
estimated by watching the red/green control indicator light or read directly from the digital
display. By knowing the amount of heating, the user can tell if the calibrator is heating up
to the set-point, cooling down, or controlling at a constant temperature. Monitoring the
percent heater power allows the user to determine the stability of the well temperature.
With good control stability, the percent heating power should not fluctuate more than ±1%
within one minute.
The heater power display is accessed in the secondary menu. Press SET and EXIT
simultaneously and release. The heater power is displayed as a percentage of full power.
Well Temperature
Access Heater Power
in Secondary Menu
Heater Power in Percent
Negative numbers indicate the well is being cooled.
-100% means the well is being cooled at maximum power. 0 means the well requires
neither heating nor cooling. 100% means the well is being heated at maximum power. To
exit out of the secondary menu, press EXIT. To continue on to the proportional band setting
function, press SET.
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Chapter 6. Controller Operation
6.9 Proportional Band
In a proportional controller such as this, the heater output power is proportional to the well
temperature over a limited range of temperatures around the set-point. This range of
temperature is called the proportional band. At the bottom of the proportional band, the
heating is 100%. At the top of the proportional band, the cooling is 100%. Thus, as the
temperature rises, the heater power is reduced, which consequently tends to lower the
temperature back down. In this way the temperature is maintained at a fairly constant
temperature.
The temperature stability of the well and response time depend on the width of the
proportional band (see Figure 6 below). If the band is too wide, the well temperature
deviates excessively from the set-point due to varying external conditions.This is because
the power output changes very little with temperature and the controller cannot respond
very well to changing conditions or noise in the system.If the proportional band is too
narrow, the temperature may swing back and forth because the controller overreacts to
temperature variations. For best control stability, the proportional band must be set for the
optimum width.
Proportional Band
Too Narrow
Proportional Band
Too Wide
Optimum Proportional Band
Figure 6: Well Temperature Fluctuation at Various Proportional Band Settings
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Chapter 6. Controller Operation
6.9 Proportional Band (cont.)
The proportional band width is set at the factory and recorded on the Report of
Calibration. The proportional band width may be altered by the user if he desires to
optimize the control characteristics for a particular application.
The proportional band width is easily adjusted from the front panel. The width may be set
to discrete values in degrees C or F depending on the selected units. The proportional band
adjustment is accessed within the secondary menu. Press SET and EXIT to enter the
secondary menu and show the heater power. Then press SET to access the proportional
band.
Access Heater Power
in Secondary Menu
Heater Power in Percent
Access Proportional Band
Proportional Band Setting
To change the proportional band, press UP or DOWN.
New Proportional Band Setting
To accept the new setting and access the cutout set-point, press SET. Pressing EXIT will
exit the secondary menu, ignoring any changes just made to the proportional band value.
Accept the New Proportional Band Setting
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Chapter 6. Controller Operation
6.10 Cutout
As a protection against software or hardware fault or user error, the calibrator is equipped
with an adjustable cutout device that shuts off power to the heater if the well temperature
exceeds a set value. This protects the instrument and probes from excessive temperatures.
The cutout temperature is programmable by the operator from the front panel of the
controller.
If the cutout is activated because of excessive well temperature, then power to the heater is
shut off and the instrument cools. The well cools until it reaches a few degrees below the
cutout set-point temperature. At this point, the action of the cutout is determined by the
setting of the cutout mode parameter. The cutout has two modes — automatic reset or
manual reset. If the mode is set to automatic, the cutout automatically resets itself when
the temperature falls below the reset temperature allowing the well to heat up again. If the
mode is set to manual, the heater remains disabled until the user manually resets the
cutout.
The cutout set-point may be accessed within the secondary menu. Press SET and EXIT to
enter the secondary menu and show the heater power. Then press SET twice to access the
cutout set-point.
Access Heater Power in Secondary Menu
Heater Power in Percent
Access Proportional Band
Proportional Band Setting
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Chapter 6. Controller Operation
6.10 Cutout (cont.)
Access Cutout Set-point
Cutout Set-point
To change the cutout set-point, press UP or DOWN.
New Cutout Set-point
To accept the new cutout set-point, press SET.
Accept Cutout Set-point
The next function is the configuration menu. Press EXIT to resume displaying the well
temperature.
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Chapter 6. Controller Operation
6.11 Controller Configuration
The controller has a number of configuration and operating options and calibration
parameters that are programmable via the front panel. These are accessed from the
secondary menu after the cutout set-point function by pressing SET.
There are four sets of configuration parameters—probe parameters, operating parameters,
serial interface parameters, and controller calibration parameters. The menus are selected
using the UP and DOWN keys and then pressing SET.
6.11.1 Probe Parameters
The probe parameter menu is indicated by:
Probe Parameters Menu
Press SET to enter the menu. The probe parameters menu contains the parameters R0,
ALPHA, DELTA, and BETA, which characterize the resistance-temperature relationship
of the platinum control probe. These parameters may be adjusted to improve the accuracy
of the calibrator. This procedure is explained in detail in Chapter 7.
The probe parameters are accessed by pressing SET after the name of the parameter is
displayed. The value of the parameter may be changed using the UP and DOWN buttons.
After the desired value is reached, press SET to set the parameter to the new value.
Pressing EXIT will cause the parameter to be skipped, ignoring any changes that may have
been made.
6.11.1a R0
This probe parameter refers to the resistance of the control probe at 0°C. The value of this
parameter is set at the factory for best instrument accuracy.
6.11.1b ALPHA
This probe parameter refers to the average sensitivity of the probe between 0 and 100°C.
The value of this parameter is set at the factory for best instrument accuracy.
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Chapter 6. Controller Operation
6.11.1c DELTA
This parameter relates to the second order nonlinearity of the sensor. The value is set at the
factory for best instrument accuracy.
6.11.1d BETA
This parameter relates to the higher order nonlinearity of the sensor below 0°C. The value
is set at the factory for best instrument accuracy.
6.11.2 Operating Parameters
The operating parameters menu is indicated by:
Operating Parameters Menu
Press UP to enter the menu. The operating parameters menu contains the units scale
selection set and cutout reset mode setting.
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Chapter 6. Controller Operation
6.11.2a Temperature Scale Units
The temperature scale units of the controller may be set by the user to degrees Celsius (°C)
or Fahrenheit (°F). The units are used in displaying the well temperature, set-point,
proportional band, and cutout set-point.
The temperature scale units selection is the first function in the operating parameters
menu.
Scale Units Currently Selected
Press UP or DOWN to change the units.
New Units Selected
Press SET to accept the new selection and resume displaying the well temperature.
6.11.2b Cutout Reset Mode
The cutout reset mode determines whether the cutout resets automatically when the well
temperature drops to a safe value or must be manually reset by the operator. The parameter
is indicated by:
Cutout Reset Mode Parameter
Press SET to access the parameter setting. Normally the cutout is set for automatic mode.
Cutout Set for Automatic Reset
To change to manual reset mode, press UP and then SET.
Cutout Set for Manual Reset
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Chapter 6. Controller Operation
6.11.3 Serial Interface Parameters
The serial RS-232 interface parameters menu is indicated by:
Serial RS-232 Interface
Parameters Menu
The serial interface parameters menu contains parameters which determine the operation
of the serial interface. These controls only apply to instruments fitted with the serial
interface. The parameters in the menu are BAUD rate, sample period, duplex mode, and
linefeed.
6.11.3a BAUD Rate
The BAUD rate is set at 2400 and is not adjustable. The BAUD rate of 2400 is required to
communicate with the Kaye Validator.
6.11.3b Sample Period
The sample period is the time period in seconds between temperature measurements
transmitted from the serial interface. For example, if the sample rate is set to 5, the
instrument transmits the current measurement over the serial interface approximately
every five seconds. The automatic sampling is disabled with a sample period of 0. The
sample period is indicated by:
Serial Sample Period Parameter
Press SET to choose to set the sample period. The current sample period value will be
displayed.
Current Sample Period (Seconds)
Adjust the value with UP or DOWN and then use SET to set the sample rate to the
displayed value.
New Sample Period
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Chapter 6. Controller Operation
6.11.3c Duplex Mode
The next parameter is the duplex mode. The duplex mode may be set to full duplex or half
duplex. With full duplex any commands received by the calibrator via the serial interface
are immediately echoed or transmitted back to the device of origin. With half duplex the
commands are executed but not echoed. The duplex mode parameter is indicated by:
Serial Duplex Mode Parameter
Press SET to access the mode setting.
Current Duplex Mode Setting
The mode may be changed using UP or DOWN and pressing SET.
New Duplex Mode Setting
6.11.3d Linefeed
The final parameter in the serial interface menu is the linefeed mode. This parameter
enables (on) or disables (off) transmission of a linefeed character (LF, ASCII 10) after
transmission of any carriage-return. The linefeed parameter is indicated by:
Serial Linefeed Parameter
Press SET to access the linefeed parameter.
Current Linefeed Setting
The mode may be changed using UP or DOWN and pressing SET.
New Linefeed Setting
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Chapter 6. Controller Operation
6.11.4 Calibration Parameters
The user has access to a number of the instrument calibration constants, namely, CTO, B0,
and BG. These values are set at the factory and must not be altered. The correct values are
important to the accuracy and proper and safe operation of the calibrator. Access to these
parameters is available to the user only so that in the event that the controller’s memory
fails, the user may restore these values to the factory settings. The user should have a list
of these constants and their settings with the manual.
CAUTION!
DO NOT change the values of the calibration constants from the
factory set values. The correct setting of these parameters is
important to the safety and proper operation of the calibrator.
The calibration parameters menu is indicated by:
Calibration Parameters Menu
Press SET five times to enter the menu.
6.11.4a CTO
Parameter CTO sets the calibration of the over-temperature cutout. This is not adjustable
by software but is adjusted with an internal potentiometer. This parameter should read
between 150 and 170.
6.11.4b BO and BG
These parameters calibrate the accuracy of the temperature set-point. These are
programmed at the factory when the instrument is calibrated. Do not alter the value of
these parameters. If the user desires to calibrate the instrument for improved accuracy,
calibrate R0 and ALPHA according to the procedure given in Chapter 7.
6.11.4c SCO
This parameter is used at the factory for testing purposes and should not be altered by the
user.
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Chapter 6. Controller Operation
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Chapter 7. Calibration Procedure
Chapter 7.
Calibration Procedure
7.1 Introduction
Calibration of this instrument should be performed at regularly scheduled intervals by
qualified authorized personnel in accordance with your company’s policy. Following is the
recommended procedure for calibrating this instrument.
7.2 Calibration Equipment
Calibration requires a standard thermometer that is adequately accurate and fits properly
into one of the reference holes in the block. Recommended equipment includes a
laboratory grade PRT with a length of 230 to 300 mm (9 to 12 inches) and a diameter of
4.76 or 6.35 mm (3/16 or 1/4 inches). The combined accuracy of the PRT and the readout,
used to display the temperature, should be 0.025°C or better.
7.3 Calibration
The accuracy of the instrument over the full range is determined by the values of the
calibration parameters R0, ALPHA, DELTA, and BETA. The calibration procedure
involves measuring the error between the instrument and the reference thermometer at
several temperature throughout the range and adjusting the calibration parameters as
necessary to reduce the errors to within acceptable limits. The stated accuracy of the
instrument can be found in Chapter 2. Because of the way the calibration parameters affect
the temperature, the simplest way to proceed is to measure the errors at 0°C, 100°C,
140°C, and –25°C, and adjust R0, ALPHA, DELTA, and BETA at each point respectively.
Follow these steps:
1. If “as found” data is required, measure the error at various temperatures throughout
the range such as (–40 for LTR–40/140), (–25 for LTR–25/140), 0, 25, 50, 75, 100,
and 140°C. The errors are measured by setting the controller to the desired
temperature, allowing the block to reach the temperature and stabilize, and reading the
actual temperature of the block with the standard thermometer. If the measured errors
are all within acceptable limits, no further action is required and following the
remainder of this procedure is not necessary. If the accuracy needs to be improved,
continue with Step 2.
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Chapter 7. Calibration Procedure
7.3 Calibration (cont.)
2. Set the set-point to 0°C and allow adequate time for the block to reach this
temperature and stabilize. Adjust the R0 calibration parameter (see page 42) to make
the block temperature as measured with the standard thermometer match the set-point.
The approximate ratio between a change in R0 and a change in temperature at 0°C is
about 0.4 to 1. For example, if the block temperature is high by 0.1°C at 0°C, then
decrease R0 by 0.04.
3. Set the set-point to 100°C and allow adequate time for the block to reach this
temperature and stabilize. Adjust the ALPHA calibration parameter (see page 42) to
make the block temperature as measured with the standard thermometer match the setpoint. The approximate ratio between a change in ALPHA and a change in
temperature at 100°C is about 0.00004 to 1. For example, if the block temperature is
high by 0.1°C at 100°C, then decrease ALPHA by 0.000004.
4. Set the set-point to 140°C and allow adequate time for the block to reach this
temperature and stabilize. Adjust the DELTA calibration parameter (see page 43) to
make the block temperature as measured with the standard thermometer match the setpoint. The approximate ratio between a change in DELTA and a change in temperature
at 140°C is about -1.7 to 1. For example, if the block temperature is high by 0.1°C at
50°C, then increase DELTA by 0.17.
5. Set the set-point to the lowest temperature and allow adequate time for the block to
reach this temperature and stabilize. Adjust the BETA calibration parameter (see
page 43) to make the block temperature as measured with the standard thermometer
match the set-point. The approximate ratio between a change in BETA and a change in
temperature at –25°C is about -50 to 1. For example, if the block temperature is high
by 0.1°C at –25°C, then increase BETA by 5.0.
6. Repeat Step 1 to ensure the instrument is now accurate throughout the full range.
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Chapter 8. Maintenance
Chapter 8.
Maintenance
8.1 Maintenance Guidelines
•
The calibration instrument has been designed with the utmost care. Ease of operation
and simplicity of maintenance have been a central theme in the product development.
Therefore, with proper care the instrument should require very little maintenance.
Avoid operating the instrument in an oily, wet, dirty, or dusty environment.
•
If the outside of the instrument becomes soiled, it may be wiped clean with a damp
cloth and mild detergent. Do not use harsh chemicals on the surface which may
damage the paint.
•
It is important to keep the well of the calibrator clean and clear of any foreign matter.
DO NOT use fluid to clean out the well.
•
The dry-well calibrator should be handled with care. Avoid knocking or dropping the
calibrator.
•
For dry-wells with removable probe sleeves, the sleeves can become covered with
dust and carbon material. If the buildup becomes too thick, it could cause the sleeves
to become jammed in the wells. Avoid this buildup by periodically buffing the sleeves
clean.
•
If a sleeve should be dropped, examine the sleeve for deformities before inserting it in
the well. If there is any chance of jamming the sleeve in the well, file or grind off the
protuberance.
•
DO NOT slam the probe stems into the well. This type of action can cause a shock to
the sensor.
•
If a hazardous material is spilt on or inside the equipment, the user is responsible for
taking the appropriate decontamination steps as outlined by the national safety council
with respect to the material.
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Chapter 8. Maintenance
8.1 Maintenance Guidelines (cont.)
•
If the mains supply cord becomes damaged, replace it with a cord with the appropriate
gauge wire for the current of the instrument. If there are any questions, call GE
Customer Service for more information.
•
Before using any cleaning or decontamination method except those recommended by
GE Measurement & Control, users should check with GE Customer Service to be sure
that the proposed method will not damage the equipment.
•
If the instrument is used in a manner not in accordance with the equipment design, the
operation of the dry-well may be impaired, or safety hazards may arise.
•
The over-temperature cut-out should be checked every 6 months to see that it is
working properly. In order to check the user selected cut-out, follow the controller
directions (page 28) for setting the cut-out. Both the manual and the auto reset option
of the cut-out should be checked. Set the instrument temperature higher than the cutout. Check to see if the display flashes cut-out and the temperature is decreasing.
•
Keep the heat sink fins and fan guard clear of dust.
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Chapter 9. Troubleshooting
Chapter 9.
Troubleshooting
9.1 Troubleshooting Problem Conditions and Solutions
In the event that the dry-well appears to function abnormally, this section may help to find
and solve the problem. Several possible problem conditions are described, along with
likely causes and solutions. If a problem arises, please read this chapter carefully and
attempt to understand and solve the problem. If the dry-well seems faulty or the problem
cannot otherwise be solved, contact GE Customer Service for assistance. Be sure to have
the instrument model number, serial number, and voltage available.
Problem
Table 3: Possible Dry-well Problems and Solutions
Possible Causes and Solutions
Incorrect
temperature reading
Incorrect R0, ALPHA, DELTA, and BETA parameters. Find
the values for R0, ALPHA, DELTA, and BETA on the Report of
Calibration that was shipped with the instrument (or from
subsequent calibrations of the instrument). Reprogram the
parameters into the instrument memory (see Probe Parameters,
page 42). Allow the instrument to stabilize and verify the
accuracy of the temperature reading.
Controller locked up. The controller may have locked up due to
a power surge or other aberration. Initialize the system by
performing the Factory Reset Sequence.
Factory Reset Sequence. Hold the SET and EXIT buttons down
at the same time while powering up the instrument. After the
instrument displays -init-, release the buttons. The display shows init-, the instrument model number and the firmware version.
After performing the master reset sequence, all of the
configuration parameters are reset to their default values.
Reprogram R0, ALPHA, DELTA, and BETA parameters into the
instrument memory (see Probe Parameters, page 42) and any
other applicable configuration parameters. Allow the instrument
to stabilize and verify the accuracy of the temperature reading.
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Chapter 9. Troubleshooting
Table 3: Possible Dry-well Problems and Solutions (Continued)
Problem
Possible Causes and Solutions
Blank display after
Blown fuse. A fuse may have blown due to a power surge or
mains power applied failure of a component. Replace the fuse once. If the fuse blows a
second time, it is likely caused by the failure of a component.
Always replace the fuse with one of the same rating, voltage, and
type. Never replace the fuse with one of a higher current rating.
The display shows
Sensor is disconnected or shorted. Please contact GE Customer
“-273°C” or “-459°F” Service for further instructions.
The display shows
“cut-out”
Software cut-out is set to low. Check the cutout setting in the
Set-point menu.
Temperature readout
is not the actual
temperature of the
well
Calibration may be needed or interference from emitting RF
energy. When the instrument is stable, rotate the instrument
slowly. If the display does not change, the instrument may need to
be calibrated. Contact GE Customer Service. If the display
changes more than twice the normal display deviation, another
instrument in the area could be emitting RF energy. Move the
instrument to a different location and rotate again. If the
temperature is correct in the new location or deviates differently
than in the first area, RF energy is present in the room. If you have
to perform the test in the affected area, use the comparison test to
eliminate any possible errors.
9.2 Comments
9.2.1 EMC Directive
GE’s equipment has been tested to meet the European Electromagnetic Compatibility
Directive (EMC Directive, 89/336/EEC). The Declaration of Conformity for your
instrument lists the specific standards to which the unit was tested.
9.2.2 Low Voltage Directive (Safety)
In order to comply with the European Low Voltage Directive (73/23/EEC), GE’s
equipment has been designed to meet the IEC 1010-1 (EN 61010-1) and the IEC 1010-2010 (EN 61010-2-010) standards.
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Chapter 9. Troubleshooting
9.2.3 Wiring Diagrams
Figure 7: LTR-25/140 Wiring Diagram
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55
Chapter 9. Troubleshooting
9.2.3 Wiring Diagrams (cont.)
Figure 8: LTR-40/140 Wiring Diagram
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Warranty
Warranty
Each instrument manufactured by GE Sensing is warranted to be free from defects in
material and workmanship. Liability under this warranty is limited to restoring the
instrument to normal operation or replacing the instrument, at the sole discretion of GE
Sensing. Fuses and batteries are specifically excluded from any liability. This warranty is
effective from the date of delivery to the original purchaser. If GE Sensing determines that
the equipment was defective, the warranty period is:
•
one year for general electronic failures of the instrument
•
one year for mechanical failures of the sensor
If GE Sensing determines that the equipment was damaged by misuse, improper
installation, the use of unauthorized replacement parts, or operating conditions outside the
guidelines specified by GE Sensing, the repairs are not covered under this warranty.
The warranties set forth herein are exclusive and are in lieu of all other
warranties whether statutory, express or implied (including warranties or
merchantability and fitness for a particular purpose, and warranties arising
from course of dealing or usage or trade).
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57
Return Policy
Return Policy
If a GE Sensing instrument malfunctions within the warranty period, the following
procedure must be completed:
1. Notify GE Sensing, giving full details of the problem, and provide the model number
and serial number of the instrument. If the nature of the problem indicates the need for
factory service, GE Sensing will issue a RETURN AUTHORIZATION number (RA),
and shipping instructions for the return of the instrument to a service center will be
provided.
2. If GE Sensing instructs you to send your instrument to a service center, it must be
shipped prepaid to the authorized repair station indicated in the shipping instructions.
3. Upon receipt, GE Sensing will evaluate the instrument to determine the cause of the
malfunction.
Then, one of the following courses of action will then be taken:
•
If the damage is covered under the terms of the warranty, the instrument will be
repaired at no cost to the owner and returned.
•
If GE Sensing determines that the damage is not covered under the terms of the
warranty, or if the warranty has expired, an estimate for the cost of the repairs at
standard rates will be provided. Upon receipt of the owner’s approval to proceed, the
instrument will be repaired and returned.
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Customer Support Centers
U.S.A.
For Sales and Services
(Repair/Calibration):
GE Measurement & Control
St Marys Center
967 Windfall Road
St Marys, Pennsylvania 15857
U.S.A.
T: 814-834-9140
F: 814-781-7969
stmaryscc@ge.com
U.S.A.
For Technical Support:
The Boston Center
1100 Technology Park Drive
Billerica, MA 01821
U.S.A.
T: 800-833-9438 (toll-free)
T: 978-437-1242
E-mail: validation.support@ge.com
Europe, Asia and Middle East
Sales and Service:
GE Sensing & Inspection Technologies
GmbH
Sinsheimer Strasse 6
D-75179 Pforzheim
Germany
T: +49(0)7231-14335 0
F: +49(0)7212 391 035
E-mail: CCOPforzheim@ge.com
China:
GE Sensing & Inspection Technologies
Building 10, Jintong International
Industrial Park
No. 8 Xihu Road, Wujin High-Tech
Industrial Zone
Changzhou, China 213164
T:+86 519 8831 8080 ext. 50087
F:+86 519 8831 2601
Brazil
Sales and Service:
GE Measurement & Control
Avenida Maria Coelho Aguiar, 215
Bloco C, 6º andar
Jd. São Luiz - São Paulo - SP
05804-900 - Brasil
T +55 11 3614 1876
F +55 11 3614 1799
E sensing.brasil@ge.com
S www.ge-mcs.com./pt
www.ge-mcs.com/en/about-us/quality.html
www.ge-mcs.com
©2013 General Electric Company. All rights reserved.
Technical content subject to change without notice.
M4374 Rev. D