Teledyne 2000A-EU User Manual

Thermal Conductivity Analyzer

OPERATING INSTRUCTIONS FOR

Model 2000A-EU

Thermal Conductivity Analyzer

DANGER

HIGHLY TOXIC AND OR FLAMMABLE LIQUIDS OR GASES MAY BE PRESENT IN THIS MONITORING
SYSTEM.

PERSONAL PROTECTIVE EQUIPMENT MAY BE REQUIRED WHEN SERVICING THIS SYSTEM.
HAZARDOUS VOLTAGES EXIST ON CERTAIN COMPONENTS INTERNALLY WHICH MAY PERSIST

FOR A TIME EVEN AFTER THE POWER IS TURNED OFF AND DISCONNECTED.
ONLY AUTHORIZED PERSONNEL SHOULD CONDUCT MAINTENANCE AND/OR SERVICING. BEFORE

CONDUCTING ANY MAINTENANCE OR SERVICING CONSULT WITH AUTHORIZED SUPERVISOR/
MANAGER.

Teledyne Analytical Instruments

P/N M66182

07/22/05

ECO # 05-0131

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Model 2000A-EU

Copyright © 1999 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 91749-1580.

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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Thermal Conductivity Analyzer

Specific Model Information

The instrument for which this manual was supplied may incorporate one or more
options not supplied in the standard instrument. Commonly available options are listed
below, with check boxes. Any that are incorporated in the instrument for which this
manual is supplied are indicated by a check mark in the box.

Instrument Serial Number: _______________________

Options Available with Order:

❑❑

❑ 2000A-C: Auto Calibration valves (zero/span) built-in gas selector panel

❑❑

and control valves are electronically controlled to provide
synchronization with the analyzer’s operations.

❑❑

❑ 2000A-G: Stainless steel cell block with nickel filaments and Stainless

❑❑

Steel fittings and tubing.

❑❑

❑ 2000A-H: Stainless steel cell block with gold filaments for corrosive gas

❑❑

streams and Stainless Steel fittings and tubing.

❑❑

❑ 2000A-K: 19" Rack Mount available with either one or two analyzers

❑❑

Control Units installed and ready to mount in a standard rack

❑❑

❑ 2000A-L: Gas selector panel consisting of sample/ref flow meters and

❑❑

control valves for metering input of sample/calibrations
support gases

❑❑

❑ 2000A-R: Sealed reference cell (application dependent, contact factory).

❑❑
❑❑

❑ 2000A-N: 220 VAC operation.

❑❑

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Model 2000A-EU

Model 2000A-EU complies with all of the requirements of the
Commonwealth of Europe (CE) for Radio Frequency Interference,
Electromagnetic Interference (RFI/EMI), and Low Voltage Directive
(LVD).

The following International Symbols are used throughout the In­struction Manual for your visual and immediate warnings and when
you have to attend CAUTION while operating the instrument:

STAND-BY, Instrument is on Stand-by,
but circuit is active

GROUND

Protective Earth

CAUTION, The operator needs to refer to the manual

for further information. Failure to do so may
compromise the safe operation of the equipment.

CAUTION, Risk of Electric Shock

D ANGER

COMBUSTIBLE GAS USAGE WARNING

This is a general purpose instrument designed for usage in a
nonhazardous area. It is the customer's responsibility to en­sure safety especially when combustible gases are being ana­lyzed since the potential of gas leaks always exist.

The customer should ensure that the principles of operating of
this equipment is 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, no responsibility by Teledyne, its affiliates, and
agents for damage or injury from misuse or neglect of this
equipment is implied or assumed.

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Thermal Conductivity Analyzer

Table of Contents

1 Introduction

1.1 Overview........................................................................ 1-1

1.2 Typical Applications ....................................................... 1-2

1.3 Main Features of the Analyzer ....................................... 1-2

1.4 Model Designations ....................................................... 1-3

1.5 Front P anel (Operator Interface)..................................... 1-3

1.6 Recognizing Difference Between LCD & VFD............... 1-5

1.7 Rear Panel (Equipment Interface) .................................. 1-5

1.8 Gas Connections ........................................................... 1-7

2 Operational Theory

2.1 Introduction .................................................................... 2-1

2.2 Sensor Theory ............................................................... 2-1

2.2.1 Sensor Configuration............................................... 2-1

2.2.2 Calibration ............................................................... 2-2

2.2.3 Effects of Flowrate and Gas Density........................ 2-3

2.2.4 Measurement Results.............................................. 2-3

2.3 Electronics and Signal Processing ................................ 2-3

2.4 Temperature Control ...................................................... 2-5

3 Installation

3.1 Unpacking the Analyzer................................................. 3-1

3.2 Mounting the Analyzer ................................................... 3-1

3.3 Electrical Connections (Rear Panel).............................. 3-3

3.3.1 Primary Input Power............................................... 3-4

3.3.2 Primary Input Power............................................... 3-4

3.3.3 50-Pin Equipment Interface Connector .................. 3-4

3.3.3.1 Analog Outputs .............................................. 3-5

3.3.3.2 Alarm Relays ................................................. 3-6

3.3.3.3 Digital Remote Cal Inputs.............................. 3-7

3.3.3.4 Range ID Relays ........................................... 3-9

3.3.3.5 Network I/O .................................................... 3-9

3.3.3.6 Remote V alv e Connector ............................... 3-9

3.3.4 RS-232 Port ........................................................... 3-10

3.4 Gas Connections ........................................................... 3-11

3.4.1 Sample System Design .........................................3-13

3.4.2 Pressure and Flow Rate Regulation......................3-13

3.4.3 VENT Exhaust .......................................................3-14

3.4.4 SAMPLE Gas.........................................................3-14

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Model 2000A-EU

3.4.5 REFERENCE Gas ................................................ 3-15

3.4.6 ZERO Gas .............................................................3-15

3.4.7 SPAN Gas..............................................................3-15

3.5 Testing the System.........................................................3-16

3.6 Warm Up at Po w er Up....................................................3-16

4 Operation

4.1 Introduction .................................................................... 4-1

4.2 Using the Data Entry and Function Buttons ................... 4-1

4.3 The

4.3.1 Setting the Display................................................. 4-5

4.3.2 Setting up an Auto-Cal........................................... 4-5

4.3.3 Passw ord Protection.............................................. 4-6

4.3.3.1 Entering the Password................................... 4-7

4.3.3.2 Installing or Changing the Password ............. 4-7

4.3.4 Logging Out ........................................................... 4-9

4.3.5 System Self-Diagnostic Test .................................. 4-9

4.3.6 The Model Screen ................................................. 4-10

4.3.7 Checking Linearity with ALGORITHM ................... 4-10

4.4 The

4.4.1 Zero Cal ................................................................. 4-12

4.4.1.1 Auto Mode Zeroing ........................................ 4-12

4.4.1.2 Manual Mode Zeroing.................................... 4-13

4.4.1.3 Cell Failure .................................................... 4-14

4.4.2 Span Cal................................................................ 4-14

4.4.2.1 Auto Mode Spanning ..................................... 4-15

4.4.2.2 Manual Mode Spanning................................. 4-15

4.5 The

4.6 The

4.6.1 Manual (Select/Define Range) Screen .................. 4-19

4.6.2 Auto (Single Application) Screen........................... 4-19

4.6.3 Precautions............................................................ 4-21

4.7 The

4.8 Programming ................................................................. 4-22

4.8.1 The Set Range Screen .......................................... 4.23

4.8.2 The Curve Algorithm Screen ................................. 4-25

4.8.2.1 Checking the Linearization ............................ 4-25

4.8.2.2 Manual Mode Linearization ........................... 4-26

4.8.2.3 Auto Mode Linearization................................ 4-27

4.9 Special Function Setup.................................................. 4-28

4.9.1 Output Signal Reversal.......................................... 4.28

System

Zero

and

Alarms
Range

Analyze

Function ..................................................... 4-4

Span

Functions ....................................... 4-11

Function...................................................... 4-16

Function ...................................................... 4-18

Function.................................................... 4-22

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Thermal Conductivity Analyzer

4.9.2 Special - Inverting Output ...................................... 4-29

4.9.3 Special - Polarity Coding ....................................... 4.29

4.9.4 Special - Nonlinear Application Gain Preset.......... 4-29

Maintenance

5.1 Routine Maintenance..................................................... 5-1

5.2 System Self Diagnostic Test........................................... 5-1

5.3 VFD Display .................................................................. 5-2

5.4 Fuse Replacement ......................................................... 5-2

5.5 Major Internal Components............................................ 5-3

5.6 Cell, Heater, and/or Thermistor Replacement ................ 5-5

5.6.1 Removing the Cell Compartment........................... 5-5

5.6.2 Removing and Replacing the Cell Block ............... 5-6

5.6.3 Removing the Heater and/or Thermocouple .......... 5-7

5.7 Cleaning ........................................................................ 5-4

5.8 Phone Numbers............................................................. 5-5

Appendix

A-1 Specifications ................................................................ A-1

A-2 Recommended 2-Year Spare Parts List ......................... A-3

A-3 Drawing List................................................................... A-4

A-4 19-Inch Relay Rack Panel Mount................................... A-4

A-5 Calibration Procedure for TG Application........................... A-5

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Model 2000A-EU

viii

Thermal Conductivity Analyzer Introduction 1

Introduction

1.1 Overview

The Analytical Instruments Model 2000 Thermal Conductivity Ana­lyzer is a versatile microprocessor-based instrument for measuring a com­ponent gas in a background gas, or in a specific mixture of background
gases. 2000A-EU Analyzer complies with all of the requirements of the
Comonwealth of Europe (CE) for Radio Frequency Interference and Elec­tromagnetic Interfaces (RFI/EMI) protection. It compares the thermal
conductivity of a sample stream with that of a reference gas of known
composition. The 2000 can—

• measure the concentration of one gas in a mixture of two gases.

• measure the concentration of a gas in a specific mixture of
background gases.

• measure the purity of a sample stream containing a single
impurity or a mixture of impurities.

The standard 2000 is preprogrammed with automatic linearization
algorithms for a large number of gases and gas mixtures. The factory can
add to this data base for custom applications, or the sophisticated user can
add his own unique application.

This manual covers the Model 2000A-EU General Purpose flush­panel and rack-mount units only. These units are for indoor use in a
nonhazardous environment.

Many of the Model 2000 features covered in this manual are optional,
selected according to the customers specific application. Therefore, the user
will find much here that does not apply to his instrument. This is unavoid­able due to the number of possible combinations of features available. We
have endeavored to make the manual as usable and convenient as possible,
in light of this flexibility.

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1-1

1 Introduction Model 2000A-EU

1.2 Typical Applications

A few typical applications of the Model 2000 are:

• Power Generation

• Air liquefaction

• Chemical reaction monitoring

• Steel manufacturing and heat treating

• Petrochemical process control

• Quality assurance

• Refrigeration and storage

• Gas proportioning control.

1.3 Main Features of the Analyzer

The main features of the Model 2000 Thermal Conductivity Analyzer

include:

• Three independent, user definable, analysis ranges allow up to
three different gas applications with one concentration range
each, or up to three concentration ranges for a single gas appli­cation, or any combination.

• Special recalibration range for multiple applications. Recalibrat­ing one, recalibrates all.

• Automatic, independent linearization for each range.

• Auto Ranging allows analyzer to automatically select the proper
preset range for a given single application. Manual override
allows the user to lock onto a specific range of interest.

• RS-232 serial digital port for use with a computer or other
digital communications device.

• Two adjustable concentration alarms and a system failure alarm.

• Extensive self-diagnostic testing, at startup and on demand.

• A 2-line alphanumeric display screen, driven by microprocessor
electronics, that continuously prompts and informs the operator.

• High resolution, accurate indication of target or impurity gas
concentration from large, bright, meter readout. (0-9999 ppm
through 0-100 % depending on types of gas involved.)

1-2

• Standard, proven sensor cell design.

• Wide range of custom applications, ranges, and linearization.

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Thermal Conductivity Analyzer Introduction 1

• Microprocessor based electronics: 8-bit CMOS microprocessor
with 32 kB RAM and 128 kB ROM.

• Auto and remote calibration capabilities.

• CE Mark Certified.

• Four analog outputs: two for measurement (0–1 V dc and
Isolated 4–20 mA dc) and two for range identification.

• Compact and versatile design: Small footprint, yet internal
components are accessible.

1.4 Model Designations

The Model 2000A-EU is ordinarily custom programmed at the factory
to fit the customer’s application. Many parameters, including the number of
channels, the gas application, the materials specification of the sampling
system, and others, are options. The most common options, are covered in
this manual. See the Specific Model Information checklist in the front pages
of this manual for those that apply to your Model 2000A analyzer. Some
standard models that are not covered in this manual are listed here.

Models 2000B: NEMA-4, bulkhead mounted enclosure for general

purpose, nonhazardous environments.

Models 2010: Split architecture models using a sealed explosion-proof

enclosure for the Analysis Unit and a general purpose
remote Control Unit for installation in a safe area.

Models 2020: Both the analysis section and control unit are in a single

explosion proof enclosure.

1.5 Front Panel (Operator Interface)

The 2000A is housed in a rugged metal case with all controls and
displays accessible from the front panel. See Figure 1-1. The front panel
has thirteen buttons for operating the analyzer, a digital meter, and an
alphanumeric display. They are described briefly here and in detail in the
Operations chapter of this manual.

Function Keys: Six touch-sensitive membrane switches are used to

change the specific function performed by the
analyzer:

• Analyze Perform analysis for target-gas content of a sample

gas.

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1-3

1 Introduction Model 2000A-EU

Figure 1-1: Model 2000A Front Panel

• 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 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:

• Left & Right Arrows Select between functions currently

displayed on the VFD screen.

• Up & Down Arrows Increment or decrement values of

functions currently displayed.

• Enter Moves VFD on to the next screen in a series. If none

remains, returns to the

Analyze

screen.

1-4

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Thermal Conductivity Analyzer Introduction 1

• Escape Moves VFD back to the previous screen in a series. If

none remains, returns to the

Digital Meter Display: The meter display is a LED device that
produces large, bright, 7-segment numbers that are legible in any lighting.
It produces a continuous trace readout from 0-9999 ppm or a continuous
percent readout from 1-100 %. It is accurate across all analysis ranges.

Alphanumeric Interface Screen: The VFD screen is an easy-to-use
interface between operator and analyzer. It displays values, options, and
messages that give the operator immediate feedback.

Standby Button: The Standby turns off the display and outputs,

but circuitry is still operating.

Analyze

screen.

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 the thermal conductivity sensor or the
front panel electronics, 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 electronics circuit board requires unfasten­ing rear panel screws and sliding the electronics drawer out of the case.
(See chapter 5.)

CAUTION: The Access door must be closed and latched for

CE mark compliance to be in effect.

1.6 Recognizing Difference Between LCD & VFD

LCD has GREEN background with BLACK characters. VFD has
DARK background with GREEN characters. In the case of VFD - NO
CONTRAST ADJUSTMENT IS NEEDED.

1.7 Rear Panel (Equipment Interface)

All electrical inputs and outputs to the 2000A are made through rear­panel connectors. The connectors are described briefly here and in detail in
chapter 3, Installation.

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1 Introduction Model 2000A-EU

Figure 1-2: Model 2000A-EU Rear Panel

• Power Connection Universal AC power source.

• 9-Pin RS-232 Port Serial digital concentration signal output

and control input.

• 50-Pin Equipment Interface Port

• Analog Outputs 0-1 V dc concentration plus 0-1 V dc

range ID, and isolated 4-20 mA dc
plus 4-20 mA dc range ID.

• Alarm Connections 2 concentration alarms and 1 system

alarm.

• Remote Valve Used in the 2000 for controlling

external solenoid valves only.

• Remote Span/Zero Digital inputs allow external control

of analyzer calibration.

• Calibration Contact To notify external equipment that

instrument is being calibrated and
readings are not monitoring sample.

1-6

• Range ID Contacts Four separate, dedicated,

range-identification relay contacts
(00, 01, 02, 03).

Teledyne Analytical Instruments

Thermal Conductivity Analyzer Introduction 1

Note: If you require highly accurate Auto-Cal timing, use external

Auto-Cal control where possible. The internal clock in the
Model 2000 is accurate to 2-3 %. Accordingly, internally sched­uled calibrations can vary 2-3 % per day.

1.8 Gas Connections

The gas connectors are on the bottom of the Model 2000A chassis
near the front panel. There are no gas control valves inside the main chas­sis. Electronic input/output ports are provided on the rear panel for the
operation of solenoid valves under the complete control of the Model 2000
electronics. See section 3.3.

A sample system must be provided for introduction of zero and span
gas, as well as sample gas, into the sample path, and for controlling the
flowrates through the sample and reference paths of the analyzer. Appropri­ate pressure reducing regulators must be installed at all gas supply sources.

Gas Connector-and-Control Panels for specific applications are avail­able as extra cost additions. These panels are usually designed around a
standard manifold that attaches to the Model 2000 series analyzer below
the front panel.

For those customers wishing to incorporate their own sample controls,
the recommended system piping schematic is included among the drawings
at the rear of the manual.

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1 Introduction Model 2000A-EU

1-8

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Thermal Conductivity Analyzer Operational Theory 2

Operational Theory

2.1 Introduction

The analyzer is composed of two subsystems:

1. Thermal Conductivity Sensor

2. Electronic Signal Processing, Display and Control.

The sensor is a thermal conductivity comparator that continuously
compares the thermal conductivity of the sample gas with that of a refer­ence gas having a known conductivity.

The electronic signal processing, display and control subsystem
simplifies operation of the analyzer and accurately processes the sampled
data. A microprocessor controls all signal processing, input/output, and
display functions for the analyzer.

2.2 Sensor Theory

For greater clarity, Figure 2-1 presents two different illustrations, (a)
and (b), of the operating principle of the thermal conductivity cell.

2.2.1 Sensor Configuration

The thermal conductivity sensor contains two chambers, one for the
reference gas of known conductivity and one for the sample gas. Each
chamber contains a pair of heated filaments. Depending on its thermal
conductivity, each of the gases conducts a quantity of heat away from the
filaments in its chamber. See Figure 2-1(a).

The resistance of the filaments depends on their temperature. These
filaments are parts of the two legs of a Wheatstone bridge circuit that
unbalances if the resistances of its two legs do not match. See Figure
2-1(b).

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2 Operational Theory Model 2000A-EU

Figure 2-1: Thermal Conductivity Cell Operating Principle

If the thermal conductivities of the gases in the two chambers are
different, the Wheatstone bridge circuit unbalances, causing a current to
flow in its detector circuit. The amount of this current can be an indication
of the amount of impurity in the sample gas, or even an indication of the
type of gas, depending on the known properties of the reference and
sample gases.

The temperature of the measuring cell is regulated to within 0.1 °C by
a sophisticated control circuit. Temperature control is precise enough to
compensate for diurnal effects in the output over the operating ranges of
the analyzer. (See Specifications in the Appendix for details.)

2.2.2 Calibration

Because analysis by thermal conductivity is not an absolute measure­ment, calibration gases of known composition are required to fix the
upper and lower parameters (“zero” and “span”) of the range, or ranges, of
analysis. These gases must be used periodically, to check the accuracy of

the analyzer.

During calibration, the bridge circuit is balanced, with zero gas
against the reference gas, at one end of the measurement range; and it is
sensitized with span gas against the reference gas at the other end of the
measurement range. The resulting electrical signals are processed by the
analyzer electronics to produce a standard 0-1V, or an isolated 4–20 mA
dc, output signal, as described in the next section.

2-2

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Thermal Conductivity Analyzer Operational Theory 2

2.2.3 Effects of Flowrate and Gas Density

Because the flowrate of the gases in the chambers affects their cooling
of the heated filaments, the flowrate in the chambers must be kept as equal,
constant, and low as possible.

When setting the sample and reference flowrate, note that gases
lighter than air will have an actual flowrate higher than indicated on the
flowmeter, while gases heavier than air will have an actual flowrate lower
than indicated. Due to the wide range of gases that are measured with the
Thermal Conductivity Analyzer, the densities of the gases being handled
may vary considerably.

Then, there are limited applications where the reference gas is in a
sealed chamber and does not flow at all. These effects must be taken in
consideration by the user when setting up an analysis.

2.2.4 Measurement Results

Thermal conductivity measurements are nonspecific by nature. This
fact imposes certain limitations and requirements. If the user intends to
employ the analyzer to detect a specific component in a sample stream, the
sample must be composed of the component of interest and one other gas
(or specific, and constant, mixture of gases) in order for the measured
heat-transfer differences to be nonambiguous.

If, on the other hand, the user is primarily interested in the purity of a
process stream, and does not require specific identification of the impurity,
the analyzer can be used on more complex mixtures.

2.3 Electronics and Signal Processing

The Model 2000 Thermal Conductivity Analyzer uses an 8031 micro­controller (Central Processing Unit—CPU) with 32 kB of RAM and 128
kB of ROM to control all signal processing, input/output, and display
functions for the analyzer. System power is supplied from a universal
power supply module designed to be compatible with any international
power source. (See Major Internal Components in chapter 5 Maintenance
for the location of the power supply and the main electronic PC boards.)

The Temperature Control board is mounted on the inner face of the
rear panel, under the power input receptacle. The signal processing elec­tronics including the microprocessor, analog to digital, and digital to
analog converters are located on the Motherboard at the bottom of the case.

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2 Operational Theory Model 2000A-EU

The Preamplifier board is mounted on top of the Motherboard as shown in
the figure (in chapter 5). These boards are accessible after removing the
back panel. Figure 2-2 is a block diagram of the Analyzer electronics.

2-4

Figure 2-2: Block Diagram of the Model 2000 Electronics

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Thermal Conductivity Analyzer Operational Theory 2

The Temperature Control Board keeps the temperature of the measur­ing cell regulated to within 0.1 degree C. A thermistor is used to measure
the temperature, and a zero-crossing switch regulates the power in a car­tridge-type heater. The result is a sensor output signal that is temperature
independent.

In the presence of dissimilar gases the sensor generates a differential
voltage across its output terminals. A differential amplifier converts this
signal to a unipolar signal, which is amplified in the second stage, variable
gain amplifier, which provides automatic range switching under control of
the CPU. The output from the variable gain amplifier is sent to an 18 bit
analog to digital converter.

The digital concentration signal along with input from the control
panel is processed by the CPU and passed on to the 12-bit DAC, which
outputs 0-1 V dc Concentration and Range ID signals. An voltage-to­current converter provides 4-20 mA dc concentration signal and range ID
outputs.

The CPU also provides appropriate control signals to the Displays,
Alarms, and External Valve Controls, and accepts digital inputs for exter­nal Remote Zero and Remote Span commands. It monitors the power
supply through an analog to digital converter as part of the data for the
system failure alarm.

The RS-232 port provides two-way serial digital communications to
and from the CPU. These, and all of the above electrical interface signals
are described in detail in chapter 3 Installation.

2.4. Temperature Control

For accurate analysis the sensor of this instrument is temperature
controlled to 60oC.

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2 Operational Theory Model 2000A-EU

2-6

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Thermal Conductivity Analyzer Installation 3

Installation

Installation of the Model 2000A Analyzer includes:

1. Unpacking

2. Mounting

3. Gas connections

4. Electrical connections

5. Installing the Sensor

6. Testing the system.

3.1 Unpacking the Analyzer

The analyzer is shipped ready to install and prepare for operation.
Carefully unpack the analyzer and inspect it for damage. Immediately
report any damage to the shipping agent.

The four gas fittings that mate with the 1/8 NPT gas ports on the
Model 2000A, are not included. They must be supplied by the customer.

3.2 Mounting the Analyzer

The Model 2000A is for indoor use in a general purpose area. It is
NOT for hazardous environments of any type. It must be protected from:

• Direct sunlight

• Drafts of air

• Shock and vibration

• Temperatures below 30 °F (-1 °C) or above 110 °F (43 °C).

Locate the 2000A as close as possible, subject to the above conditions,
to the sample point to minimize effects of sample line lag time on the
analysis.

The standard model is designed for flush panel mounting. Figure 3-1 is
an illustration of the 2000A standard front panel and mounting bezel. There

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3 Installation Model 2000A-EU

are four mounting holes—one in each corner of the rigid frame. Figure
3-1a contains the hole pattern dimensions. See the outline drawing, at the
back of this manual for overall dimensions.

On special order, a 19" rack-mounting panel can be provided. For
rack mounting, one or two 2000A series analyzers are flush-panel mounted
on the rack panel. See Figure 3-1b for dimensions of the mounting panel.

6.7"

Figure 3-1a: Front Panel of the Model 2000A

Figure 3-1b: Single and Dual 19" Rack Mounts

5.75

5.75

8.75

8.75

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Thermal Conductivity Analyzer Installation 3

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 the
sensor inside the instrument. The door 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 4.5 mm wide), such as a
small hex wrench or screwdriver Allow clearance for the door to open in a
90-degree arc of radius 19.3 cm. See Figure 3-2.

Figure 3-2: Required Front Door Clearance

3.3 Electrical Connections (Rear Panel)

Figure 3-3 shows the Model 2000A-EU rear panel. There are connec­tors for power, digital communications, and both digital and analog con­centration output.

Figure 3-3: Rear Panel of the Model 2000A-EU

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3 Installation Model 2000A-EU

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
shielding.

3.3.1 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.

DANGER: POWER IS APPLIED TO THE INSTRUMENT'S CIR-

CUITRY AS LONG AS THE INSTRUMENT IS CON­NECTED TO THE POWER SOURCE. THE STANDBY
ON THE FRONT PANEL IS FOR SWITCHING
POWER ON OR OFF TO THE DISPLAYS AND OUT­PUTS ONLY.

The standard power supply requires a 110 V ac, 50-60 Hz power
source. If you have the -N option, you will require 220 V ac, 50-60 Hz
power.

3.3.2 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.)

3.3.3 50-Pin Equipment Interface Connector

Figure 3-4 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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Thermal Conductivity Analyzer Installation 3

Figure 3-4: Equipment Interface Connector Pin Arrangement

3.3.3.1 Analog Outputs

There are four DC output signal pins—two pins per output. For

polarity, see Table 3-1. The outputs are:
0–1 V dc % of Range: Voltage rises linearly with increasing concentra-

tion, from 0 V at 0 concentration to 1 V at full
scale. (Full scale = 100% of programmable range.)

0–1 V dc Range ID: 0.25 V = Range 1, 0.5 V = Range 2, 0.75 V =

Range 3, 1 V = Cal Range.

4–20 mA dc % Range: Current rises linearly with concentration, from 4

mA at 0 concentration to 20 mA at full scale. (Full
scale = 100% of programmable range.)

4–20 mA dc Range ID: 8 mA = Range 1, 12 mA = Range 2, 16 mA =

Range 3, 20 mA = Range 4.

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

Examples:

The analog output signal has a voltage which depends on gas concen-

tration relative to the full scale of the 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 autoranging mode.

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The signal output for concentration is linear over the currently se­lected analysis range. For example, if the analyzer is set on a range that
was defined as 0–10 % hydrogen, then the output would be as shown in
Table 3-2.

Table 3-2: Analog Concentration Output—Example

Percent Voltage Signal Current Signal
Hydrogen Output (V dc) Output (mA dc)

0 0.0 4.0
1 0.1 5.6
2 0.2 7.2
3 0.3 8.8
4 0.4 10.4
5 0.5 12.0
6 0.6 13.6
7 0.7 15.2
8 0.8 16.8
9 0.9 18.4

10 1.0 20.0

To provide an indication of the range, the Range ID analog outputs
are used. They generate a steady preset voltage (or current when using the
current outputs) to represent a particular range. Table 3-3 gives the range
ID output for each analysis range.

Table 3-3: Analog Range ID Output—Example

Range Voltage (V) Current (mA) Application

Range 1 0.25 8 0-1 % H2 in N
Range 2 0.50 12 0-10 % H2 in N
Range 3 0.75 16 0-1 % H2 in Air
Range 4 (Cal) 1.00 20 0-1 % H2 in N

3.3.3.2 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 3-4. They are

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Thermal Conductivity Analyzer Installation 3

capable of switching up to 3 amperes at 250 V ac into a resistive load. The
connectors are:

Threshold Alarm 1: • Can be configured as high (actuates when concen-

tration is above threshold), or low (actuates when
concentration is below threshold).

• Can be configured as failsafe or nonfailsafe.

• Can be configured as latching or nonlatching.

• Can be configured out (defeated).

Threshold Alarm 2: • Can be configured as high (actuates when concen-

tration is above threshold), or low (actuates when
concentration is below threshold).

• Can be configured as failsafe or nonfailsafe.

• Can be configured as latching or nonlatching.

• Can be configured out (defeated).

System Alarm: Actuates when DC power supplied to circuits is

unacceptable in one or more parameters. Perma­nently configured as failsafe and latching. Cannot be
defeated. Actuates if self test fails.

(Reset by pressing
Then press

System

Further detail can be found in chapter 4, section 4-5.

Table 3-4: 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

3.3.3.3 Digital Remote Cal Inputs

to resume.

button to remove power.

again and any other button EXCEPT

Accept 0 V (off) or 24 V dc (on) inputs for remote control of calibra­tion. (See Remote Calibration Protocol below.) See Table 3-5 for pin
connections.

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Zero: Floating input. A 5 to 24 V pulse input across the + and –

Zero

pins puts the analyzer into the
be grounded at the source of the signal. A synchronous
signal must open and close the gas control valves appropri­ately. See 3.3.3.6 Remote Probe Connector. (With the –C
option the internal valves operate automatically.)

Span: Floating input. A 5 to 24 V pulse input across the + and –

pins puts the analyzer into the
be grounded at the source of the signal. A synchronous
signal must open and close the gas control valves appropri­ately. See 3.3.3.6 Remote Probe Connector. (With the –C
option, the internal valves operate automatically.)

Cal Contact: This relay contact is closed while analyzer is spanning

and/or zeroing. (See Remote Calibration Protocol below.)

mode. Either side may

Span

mode. Either side may

Table 3-5: 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 2000A 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.

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.

3-8

For example:

1) Test the CRC. When the CRC is open, Send a zero command
until the CRC closes (The CRC will close quickly.)

2) When the CRC closes, remove the zero command.

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Thermal Conductivity Analyzer Installation 3

3) When CRC opens again, send a span command until the CRC
closes. (The CRC will close quickly.)

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 Probe connector (paragraph 3.3.3.6) provides

signals to operate the zero and span gas valves synchro­nously. However, if you have the –C Internal valve option,
which includes zero and span gas inputs, the 2000A automati­cally regulates the zero, span and sample gas flow.

3.3.3.4 Range ID Relays

Four dedicated Range ID relay contacts. For any single application
they are assigned to relays in ascending order. For example: if all ranges
have the same application, then the lowest range is assigned to the Range 1
ID relay, and the highest range is assigned to the Range 3 ID relay. Range
4 is the Cal Range ID relay. Table 3-6 lists the pin connections.

Table 3-6: 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
18 Range 3 ID Contact
34 Range 4 ID Contact
35 Range 4 ID Contact

3.3.3.5 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 in future options to the
instrument. Pins 13 (+) and 29 (–).

3.3.3.6 Remote Valve Connector

The 2000A is a single-chassis instrument, which has no Remote Probe
Unit. Instead, the Remote Valve connector is used as another method for
controlling external sample/zero/span gas valves. See Figure 3-5.

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3 Installation Model 2000A-EU

Figure 3-5: Remote Probe Connector Pinouts

The voltage from these outputs is nominally 0 V for the OFF and
15 V dc 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 could limit the obtainable
voltage, depending on the load impedance applied. See Figure 3-7.

Figure 3-6: FET Series Resistance

3.3.4 RS-232 Port

The digital signal output is a standard 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.

Output: The data output is status information, in digital form, up­dated every two seconds. Status is reported in the following order:

• The concentration in ppm or percent

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Thermal Conductivity Analyzer Installation 3

• The range in use (00 = Range 1, 01 = Range 2, 10 = Range 3,
11 = Range 4)

• The span of the range (0-100 %, 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.

Input: The input functions using RS-232 that have been imple-

mented to date are described in Table 3-7.

Table 3-7: Commands via RS-232 Input

Command Description
as<enter> Immediately starts an autospan.
az<enter> Immediately starts an autozero.
rp<enter> Allows reprogramming of two

APPLICATION (gas use) and ALGORITHM (linearization).

st<enter> Toggling input. Stops/Starts any status message output

from the RS-232, until st<enter> is sent again.

Implementation: The RS-232 protocol allows some flexibility in its

implementation. Table 3-8 lists certain RS-232 values that are required by
the Model 2000A implementation.

Table 3-8: Required RS-232 Options

Parameter Setting

Baud 2400

Byte 8 bits

Parity none

Stop Bits 1

Message Interval 2 seconds

System

functions:

3.4 Gas Connections

The gas fittings are accessed through holes on the underside of the
analyzer chassis, as shown in Figure 3-8. Use 1/8 NPT threaded conversion
fittings to convert pipe to tube for these connectors.

There are no gas control valves inside the main chassis. A sample
system must be provided for introduction of zero and span gas, as well as
sample gas, into the sample path, and for controlling the flowrates through
the sample and reference paths of the analyzer.

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3 Installation Model 2000A-EU

Figure 3-8: Gas Connections to the Basic Unit

If you have purchased a gas control panel from Analytical Instru­ments, the drawings at the back of this manual will contain a dimension
outline drawing, with the modified cutout and hole pattern for mounting,
and a drawing and/or addendum showing the gas connections.

3-12

Front Panel with optional selector panel (as shown)

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Thermal Conductivity Analyzer Installation 3

3.4.1 Sample System Design

Gas Connector and Control Panels for specific applications are avail­able as extra cost additions. These panels are usually designed around a
standard manifold that attaches to the Model 2000A series analyzer below
the front panel.

For those customers wishing to incorporate their own sample system,
electronic input/output ports are provided on the rear panel for the opera­tion of solenoid valves under the complete control of the Model 2000A
electronics. See section 3.3. The recommended system piping schematic is
included among the drawings at the rear of the manual.

1

The unit is manufactured with

/4 inch tubing and 1/8 NPT threaded

ports. The customer must provide matching fittings.

For best results, use the recommended piping system. Select a
flowmeter that can resolve 40-50 cc/min (0.08 scfh) for the reference path
of the analyzer, and select a flowmeter that can resolve 150 cc/min (0.3
scfh) for the sample path of the analyzer.

Note: The sample-line pressure regulator should be installed as

close to the sample point as possible to minimize sample-line
lag time.

3.4.2 Pressure and Flowrate Regulation

Appropriate pressure reducing regulators must be installed at all gas
supply sources. To minimize flowrate adjustments the pressure regulators
on the supporting gas supply cylinders should be adjusted to provide the
same output pressure as the sample line regulator.

The gas pressure input should be reasonably well regulated. Pressures
between .35 and 3.5 bar (5 - 51 psig) are acceptable- .7 bar (10 psig) is
normal as long as the pressure, once established, will keep the flow
constant during analysis, and within 50-200 cc/min (between 0.1 and 0.4
scfh). See Note.

Note: Gases lighter than air have a flowrate higher than indicated

on the flowmeter, while gases heavier than air have a flowrate
lower than indicated. Values can range from one half to twice
the indicated flowrate.

For example: For hydrogen or helium, set the flowrate to 50
cc/min (0.1 scfh). For carbon dioxide or argon, set the flow­rate to 200 cc/min (0.4 scfh).

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When installing pressure regulators on supply cylinders, crack the
cylinder valves so that gas is flowing during installation. This will elimi­nate the most common cause of standardization-gas contamination: air
trapped during assembly diffusing back into the cylinder. This procedure is
particularly important in applications where impurity content of 1 to 2 % is
the range of interest.

Note: If you have the –V option, The above pressure and flow

values apply instead to the vacuum at the VENT connector,
described below, with minus signs before the pressure
readings.

3.4.3 VENT Exhaust

There are two separate VENT fittings—one for the sample gas and
one for the reference gas. Use 6 mm tubing for both sample and reference
vents to minimize back pressure from restricted flow.

Exhaust connections must be consistent with the hazard level of the
constituent gases. Check local, state, and federal laws, and ensure that the
exhaust stream vents to an appropriately controlled area if required. If not
vented to the same area, both VENT lines must vent to areas with equal
ambient pressures, and pressures must vary no more than the normal
barometric changes.

Install VENT lines such that water and dirt cannot accumulate in
them.

Note: If your 2000A has the –V option, see Note at end of

and Flow Rate Regulation

, above, for gas flow considerations.

Pressure

3.4.4 SAMPLE Gas

In the standard model, sample and calibration gases are introduced
through the SAMPLE fitting. The gases must be Tee'd into the Sample inlet
with appropriate valves.

The gas pressure in should be well regulated. (See section 3.4.1.) The
sample line pressure regulator should be installed as close to the sample
line as possible to minimize sample line lag time.

If greater flow is required for improved response time, install a bypass
in the sampling system upstream of the analyzer input.

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Thermal Conductivity Analyzer Installation 3

3.4.5 REFERENCE Gas

A gas of fixed composition is needed as a reference to which the
sample gas will be compared. The reference gas is normally selected to
represent the main background gas of the analysis.

For most applications, a constant supply of reference gas flowing at
the same rate as the sample is required for best results. However, in many
cases the flow of reference gas can be slowed to about 0.08 scfh
(40 cc/min) with good results.

For some applications, an optional sealed air reference is installed. In
sealed-reference sensors the reference side of the detector cell is filled with
air and sealed. This eliminates the need to have reference gas constantly
passing through the cell.

NOTE:For instruments equipped with the optional sealed air refer-

ence, there is no REFERENCE inlet or reference VENT port.

It is highly recommended that the same cylinder of gas be used for
both the REFERENCE gas and the ZERO gas.

Pressure, flow, and safety considerations are the same as prescribed
for the SAMPLE gas, above.

3.4.6 ZERO Gas

For the ZERO gas, a supply of the background gas, usually containing
none of the impurity, is required to zero the analyzer during calibration.
For suppressed zero ranges the zero gas must contain the low-end concen­tration of the impurity.

NOTE:Because most cylinder gases are between 99.95 and 99.98%

pure, it is highly recommended that the same cylinder of gas
be used for both REFERENCE and ZERO gas.

NOTE:It is essential to the accuracy of the analyzer that the purity of

the zero gas be known. Otherwise, when the zero control is
adjusted during zero standardization, the reading will indicate
the impurity content of the zero gas, rather than zero.

3.4.7 SPAN Gas

For the SPAN gas, a supply of the background gas containing 80­100 % of the component of interest is required as a minimum. If lineariza­tion is required, intermediate concentrations of the target gas in the back­ground gas may be necessary. From one to nine separate span gases may be

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3 Installation Model 2000A-EU

used, depending on the desired precision of the linearization. See chapter 4,
Operation.

3.5 Testing the System

Before plugging the instrument into the power source:

• Check the integrity and accuracy of the gas connections. Make
sure there are no leaks.

• Check the integrity and accuracy of the electrical connections.
Make sure there are no exposed conductors

• Check that the pressure and flow of all gases are within the
recommended levels, and appropriate for your application.

Power up the system, and test it by performing the following

operations:

1. Repeat the Self-Diagnostic Test as described in chapter 4,
section 4.3.5.

3.6 Warm Up at P ower Up

Every time the unit is turned on, the instrument stays with the intro­duction screen for thirty minutes. This is to allow the cell to come up to
temperature (60oC). The only way to bypass this warm up period is by
pressing any key once, such as the Enter key.

The instrument warms up for half an hour so that it will not receive a
remote calibration signal, send false readings to a monitor system, or,
again, be calibrated by an untrained operator while the cell is cold.

NOTE:There is not feedback on whether the working temperature

has been achieved by cell to the software. If instrument
power is interrupted for only a brief time, the instrument will
wait thirty minutes again.

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Thermal Conductivity Analyzer Operation 4

Operation

4.1 Introduction

Although the Model 2000 is usually programmed to your application at the

factory, it can be further configured at the operator level, or even, cautiously,
reprogrammed. Depending on the specifics of the application, this might include
all or a subset of the following procedures:

• Setting system parameters:

• Establish a security password, if desired, requiring Operator
to log in.

• Establish and start an automatic calibration cycle, if desired.

• Routine Operation:

• Calibrate the instrument.

• Choose autoranging or select a fixed range of analysis.

• Set alarm setpoints, and modes of alarm operation (latching,
failsafe, etc).

• Program/Reprogram the analyzer:

• Define new applications.

• Linearize your ranges.

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.

4.2 Using the Data Entry and Function
Buttons

Data Entry Buttons: The < > 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
can be used to increment or decrement that modifiable item.

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∆∆

∆∇ arrow buttons

∆∆

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4 Operation Model 2000A-EU

The

Enter

button is used to accept any new entries on the VFD screen.

Escape

The
not yet accepted by use of the

button is used to abort any new entries on the VFD screen that are

Enter

button.

Figure 4-1 shows the hierarchy of functions available to the operator via the

function buttons. The six function buttons on the analyzer are:

•

Analyze.

This is the normal operating mode. The analyzer
monitors the thermal conductivity of the sample, displays the
percent or parts-per-million of target gas or contamination, and
warns of any alarm conditions.

•

System.

The system function consists of nine subfunctions.

Four of these are for ordinary setup and operation:

• Setup an Auto-Cal

• Assign Passwords

• Log out to secure system

• Initiate a Self-Test

Three of the subfunctions do auxiliary tasks:

• Checking model and software version

• Adjust LCD screen contrast

• Display more subfunctions

Contrast Function is

(Refer to Section 1.6)

DISABLED

Two of these are for programming/reprogramming the analyzer:

• Define gas applications and ranges (Refer to programming

section, or contact factory.)

• Use the Curve Algorithm to linearize output. (Refer to

programming section, or contact factory.)

•

Zero

. Used to set up a zero calibration.

•

Span.

•

Alarms.

Used to set up a span calibration.

Used to set the alarm setpoints and determine whether
each alarm will be active or defeated, HI or LO acting, latching,
and/or failsafe.

•

Range.

Used to set up three analysis ranges that can be
switched automatically with autoranging or used as individual
fixed ranges.

Any function can be selected at any time by pressing the appropriate button
(unless password restrictions apply). The order as presented in this manual is
appropriate for an initial setup.

Each of these functions is described in greater detail in the following proce­dures. The VFD screen text that accompanies each operation is reproduced, at

4-2

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Thermal Conductivity Analyzer Operation 4

System

CONTRAST

AUTO-CAL

PASSWORD

LOGOUT

MORE

MODEL

APPLICATION

SELF-TEST

ALGORITHM

Set LCD
Contrast

Span/Zero

Off/On

Enter

Password

Secure Sys &

Analyze Only

Show Model

and Version

Select
Range

Self-Test in

Progress

Select
Range

Span/Zero

Timing

Change
Yes/No

Define

Appl/Range

Slef-Test

Results

Appl/Range

Report

Contrast Function is

(Refer to Section 1.6)

Span/Zero

Off/On

Yes

Change

Password

Ver

Select

Verify/Setup

Set

Auto/Manual
Linearity Cal

Verify

Password

Verify

Points

Man

Auto

DISABLED

Enter

Input/Output

Values

Select Linrty
Span Values

Enter

Enter

Span

Zero

Alarms

Range

Analyze

Define
Range

Span in

Progress

% / ppm

Select

Setpoints &

Attributes

Auto/Manual

Span Select

Auto/Manual

Zero Select

Select
Alarm

Man

Auto/Manual

Range Adj

Auto

Analyze

Sample

Span Value

Zero in

Progress

Range/

Gas Use

Select

Range

Gas

Application

Set

Figure 4-1: Hierarchy of Functions and Subfunctions

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4 Operation Model 2000A-EU

the appropriate point in the procedure, in a Monospaced type style. Pushbut­ton names are printed in

Oblique

type.

4.3 The

The subfuctions of the
procedures for their use follow the descriptions:

• AUTO-CAL: Used to define an automatic calibration sequence

and/or start an AUTO-CAL.

• PWD: Security can be established by choosing a 3 digit

password (PWD) from the standard ASCII character set. 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.

• LOGOUT: Logging out prevents an unauthorized tampering

with analyzer settings.

• MORE: Select and enter MORE to get a new screen with

additional subfunctions listed.

• MODEL: Displays Manufacturer, Model, and Software Version

of instrument.

• APPLICATION: A restricted function, not generally accessed by

the end user. Used to define up to three analysis ranges and a
calibration range (including impurity, background, low end of range,
high end of range, and % or ppm units).

System

System

Function

function are described below. Specific

4-4

• SELF-TEST: The instrument performs a self-diagnostic test to

check the integrity of the power supply, output boards, sensor
cell, and preamplifiers.

• ALGORITHM: A restricted function, not generally accessed by the

end user. Used to linearize the output for the range of interest.

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Thermal Conductivity Analyzer Operation 4

4.3.1 Setting the Display

Contrast Function is

(Refer to Section 1.6)

DISABLED

If you cannot read anything on the display after first powering up:

1. Observe LED readout.

a. If LED meter reads 8.8.8.8.8., go to step 3.
b. If LED meter displays anything else, go to step 2.

2. Press  button twice to turn Analyzer OFF and ON again.

LED meter should now read 8.8.8.8.8.. Go to step 3.

4.3.2 Setting up an AUTO-CAL

When proper automatic valving is connected (see chapter 3, installation),
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 4.4, 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
Model 2000 is accurate to 2-3 %. Accordingly, internally sched­uled calibrations can vary 2-3 % per day.

Note: If all your ranges are for the same gas application, then AUTO-

CAL will calibrate whichever range you are in at the scheduled
time for automatic calibration.

Note: If your ranges are configured for different applications, then

AUTO-CAL will calibrate all of the ranges simultaneously (by
calibrating the Cal Range).

To setup an AutoCal cycle:

Choose

System

from the Function buttons. The VFD will display five

subfunctions.

Contrast Function is

(Refer to Section 1.6)

Use < > arrows to blink AUTOCAL, and press

DISABLED

CONTRAST AUTOCAL
PWD LOGOUT MORE

Enter

. A new screen

for ZERO/SPAN set appears.

Teledyne Analytical Instruments

4-5

4 Operation Model 2000A-EU

ZERO in Ød Øh off
SPAN in Ød Øh off

Press < > arrows to blink SPAN (or ZERO), then press

Enter

again. (You

won’t be able 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

∆∆

Use

∆∇ arrows to set an interval value, then use < > arrows to move to the

∆∆

start-time value. Use

∆∆

∆∇ arrows to set a start-time value.

∆∆

To turn ON the SPAN and/or ZERO cycles (to activate AUTOCAL):

Press

System

again, choose AUTOCAL, and press

Enter

again. When the

ZERO/SPAN values screen appears, use the < > arrows to blink the SPAN
(or ZERO) and press
ON field. Use

∆∆

∆∇ arrows to set the OFF/ON field to ON. You can now turn

∆∆

Enter

to go to the next screen. Use < > to select OFF/

these fields ON because there is a nonzero span interval defined.

4.3.3 Password Protection

Before a unique password is assigned, the system assigns TAI by default.
This password will be displayed automatically. The operator just presses the
Enter key to be allowed total access to the instrument’s features.

If a password is assigned, then setting the following system parameters can
be done only after the password is entered: alarm setpoints, assigning a new
password, range/application selections, and curve algorithm linearization.
(APPLICATION and ALGORITHM are covered in the programming section.)
However, the instrument can still be used for analysis or for initiating a self-test
without entering the password. To defeat security the password must be
changed back to TAI.

NOTE: If you use password security, it is advisable to keep a copy of

the password in a separate, safe location.

4.3.3.1 Entering the Password

To install a new password or change a previously installed password, you
must key in and
effect, pressing the

Press

ENTER

System

the old password first. If the default password is in

ENTER

to enter the

button will enter the default TAI password for you.

System

mode.

4-6

Teledyne Analytical Instruments

Thermal Conductivity Analyzer Operation 4

Contrast Function is

(Refer to Section 1.6)

DISABLED

CONTRAST AUTOCAL
PWD LOGOUT MORE

Use the < > arrow keys to scroll the blinking over to PWD, 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 password:
T A I

or

Enter password:
A A A

The screen prompts you to enter the current password. 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.

In a few seconds, you will be given the opportunity to change this pass-

word or keep it and go on.

Change Password?
<ENT>=Yes <ESC>=No

Press

Escape

to move on, or proceed as in Changing the Password,

below.

4.3.3.2 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 TAI or the previ-

ously 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.

Select new password
T A I

Teledyne Analytical Instruments

4-7

4 Operation Model 2000A-EU

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:

ABCDEFGHIJ
KLMNOPQRST
UVWXYZ[¥]^
_`abcdefgh
ijklmnopqr
stuvwxyz{|
} → !"#$%&'(
)*+'-./012
3456789:;<
=>?@

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.

Enter PWD To Verify:
A A A

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

Ø.Ø % H2 in N2
RØ1: Ø  1ØØ Anlz

screen appears as:

If an alarm is tripped, the second line will change to show which alarm it is:

Ø.Ø % H2 in N2
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 Alarm, and Range functions.

4-8

Teledyne Analytical Instruments

Thermal Conductivity Analyzer Operation 4

4.3.4 Logging Out

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.

Contrast Function is

(Refer to Section 1.6)

Use the < > arrow keys to position the blinking over the LOGOUT
function, and press

4.3.5 System Self-Diagnostic Test

The Model 2000 has a built-in self-diagnostic testing routine. Pre-pro­grammed signals are sent through the power supply, output board, preamp
board and sensor circuit. The return signal is analyzed, and at the end of the test
the status of each function is displayed on the screen, either as OK or as a
number between 1 and 1024. (See System Self Diagnostic Test in chapter 5
for number code.) If any of the functions fails, the System Alarm is tripped.

Note: The sensor will always show failed unless identical gas is

present in both channels at the time of the SELF-TEST.

The self diagnostics are run automatically by the analyzer whenever the
instrument is turned on, but the test can also be run by the operator at will. To
initiate a self diagnostic test during operation:

DISABLED

Enter

CONTRAST AUTOCAL
PWD LOGOUT MORE

to Log out. The screen will display the message:

Protected until
password entered

Press the

Contrast Function is

(Refer to Section 1.6)

Use the < > arrow keys to blink MORE, then press

Use the < > arrow keys again to move the blinking to the SELFTEST
and press Enter. The screen will follow the running of the diagnostic.

When the testing is complete, the results are displayed.

System

DISABLED

button to start the

Teledyne Analytical Instruments

System

CONTRAST AUTOCAL
PWD LOGOUT MORE

function.

Enter

MODEL APPLICATION
SELFTEST ALGORITHM

RUNNING DIAGNOSTIC
Testing Preamp  Cell

.

4-9

4 Operation Model 2000A-EU

Power: OK Analog: OK
Cell: 2 Preamp: 3

The module is functioning properly if it is followed by OK. A number
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.

4.3.6 The Model Screen

Move the < > arrow key to MORE and press
blinking, press

Enter

. The screen displays the manufacturer, model, and soft-

Enter

ware version information.

4.3.7 Checking Linearity with ALGORITHM

Enter

From the

.

System

Function screen, select ALGORITHM, and press

Range linearization
 > Ø 1 Ø 2 Ø 3 < 

Use the < > keys to select the range: 01, 02, or 03. Then press

Range: Ø 16 %
Gas use: O2  N2

Press Enter again.

Algorithm setup:
VERIFY SET UP

Select and

Enter

VERIFY to check whether the linearization has been

accomplished satisfactorily.

. With MODEL

Enter

.

Dpt INPUT OUTPUT
Ø Ø.ØØ Ø.ØØ

The leftmost digit (under Dpt) is the number of the data point being moni­tored. Use the ∆∇ keys to select the successive points.

The INPUT value is the input to the linearizer. It is the simulated output of
the analyzer. You do not need to actually flow gas.

4-10

Teledyne Analytical Instruments

Thermal Conductivity Analyzer Operation 4

The OUTPUT value is the output of the linearizer. It should be the ACTU-

AL concentration of the span gas being simulated.

If the OUTPUT value shown is not correct, the linearization must be

corrected. Press

TER

SET UP to Calibration Mode screen.

There are two ways to linearize: AUTO and MANUAL: The auto mode
requires as many calibration gases as there will be correction points along the
curve. The user decides on the number of points, based on the precision re­quired.

The manual mode only requires entering the values for each correction
point into the microprocessor via the front panel buttons. Again, the number of
points required is determined by the user.

ESCAPE

to return to the previous screen. Select and

Select algorithm
mode : AUTO

EN-

4.4 The

(1) The Model 2000 can have as many as three analysis ranges plus a
special calibration range (Cal Range); and the analysis ranges, if more than one,
may be programmed for separate or identical gas applications.

(2) If all ranges are for the same application, then you will not need the Cal
Range. Calibrating any one of the ranges will automatically calibrate the others.

(3) If: a) each range is programmed for a different gas application, b) your
sensor calibration has drifted less than 10 %, and c) your Cal Range was cali­brated along with your other ranges when last calibrated, then you can use the
Cal Range to calibrate all applications ranges at once.

If your Model 2000 analyzer fits the paragraph (3) description, above, use
the Cal Range. If your analyzer has drifted more than 10 %, calibrate each range
individually.

CAUTION: Always allow 4-5 hours warm-up time before calibrat-

ing, if your analyzer has been disconnected from its
power source. This does not apply if the analyzer
was plugged in but was in STANDBY.

Zero

and

Span

Functions

The analyzer is calibrated using reference, zero, and span gases. Gas
requirements are covered in detail in chapter 3, section 3.4 Gas Connections.
Check that calibration gases are connected to the analyzer according to the
instructions in section 3.4, observing all the prescribed precautions.

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4 Operation Model 2000A-EU

Note: Shut off the gas pressure before connecting it to the analyzer,

and be sure to limit pressure to 40 psig or less when turning it
back on.

Readjust the gas pressure into the analyzer until the flowrate through the

sensor settles between 50 to 200 cc/min (approximately 0.1 to 0.4 scfh).

4.4.1 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.

CAUTION: If you are zeroing the Cal Range by itself (multiple

application analyzers only), use

manual mode

zeroing.
If you want to calibrate ALL of the ranges at once

(multiple application analyzers only), use

auto mode

zeroing in the Cal Range.

Make sure the zero gas is flowing to the instrument. If you get a CELL

CANNOT BE BALANCED message while zeroing skip to section 4.4.1.3.

4.4.1.1 Auto Mode Zeroing

Observe the precautions in sections 4.4 and 4.4.1, above. Press

Zero

to

enter the zero function mode. The screen allows you to select whether the zero
calibration is to be performed automatically or manually. Use the ∆∇ arrow
keys to toggle between AUTO and MAN zero settling. Stop when AUTO
appears, blinking, on the display.

Select zero
mode: AUTO

Press

Enter

to begin zeroing.

#### % O 2  N 2
Slope=##### CZero

The beginning zero level is shown in the upper left corner of the display. As
the zero reading settles, the screen displays and updates information on Slope=
in percent/second (unless the Slope starts within the acceptable zero range and
does not need to settle further). The system first does a course zero, shown in
the lower right corner of the screen as
zero, and displays

4-12

FZero

, for 3 min.

Teledyne Analytical Instruments

CZero

, for 3 min, and then does a fine

Thermal Conductivity Analyzer Operation 4

Then, and whenever Slope is less than 0.01 for at least 3 min, instead of
Slope you will see a countdown: 9 Left, 8 Left, and so fourth. These are
software steps in the zeroing process that the system must complete, AFTER
settling, before it can go back to

Analyze

. Software zero is indicated by S

Zero in the lower right corner.

###### % O2  N2
4 Left=##### SZero

The zeroing process will automatically conclude when the output is within
the acceptable range for a good zero. Then the analyzer automatically returns to
the

Analyze

mode.

4.4.1.2 Manual Mode Zeroing

Press

Zero

to enter the

Zero

function. The screen that appears allows you

to select between automatic or manual zero calibration. Use the ∆∇ keys to
toggle between AUTO and MAN zero settling. Stop when MANUAL appears,
blinking, on the display.

Select zero
mode: MANUAL

Press

Enter

to begin the zero calibration. After a few seconds the first of
three zeroing screens appears. The number in the upper left hand corner is the
first-stage zero offset. The microprocessor samples the output at a predeter­mined rate.

#### % O 2  N 2
Zero adj:2048 CZero

The analyzer goes through C–Zero, F–Zero, and S–Zero. During C–Zero
and F–Zero, use the
possible to zero. Then, press

∆∆

∆∇ keys to adjust displayed Zero adj: value as close as

∆∆

Enter

.

S–Zero starts. During S–Zero, the Microcontroller takes control as in Auto
Mode Zeroing, above. It calculates the differences between successive sam­plings and displays the rate of change as Slope= a value in parts per million per
second (ppm/s).

Note: It takes several seconds for the true Slope value to display.

Wait about 10 seconds. Then, wait until Slope is sufficiently
close to zero before pressing

Enter

to finish zeroing.

#### % O 2  N 2
Slope=##### CZero

Teledyne Analytical Instruments

4-13

4 Operation Model 2000A-EU

Generally, you have a good zero when Slope is less than 0.05 ppm/s for

about 30 seconds.

Once zero settling completes, the information is stored in the analyzer’s

memory, and the instrument automatically returns to the

4.4.1.3 Cell Failure

Cell failure in the 2000 is usually associated with inability to zero the
instrument with a reasonable voltage differential across the Wheatstone bridge. If
this should ever happen, the 2000 system alarm trips, and the LCD displays a
failure message.

CELL CANNOT BE BALANCED
CHECK YOUR ZERO GAS

Before replacing the sensor:

Analyze

mode.

a. Check your zero gas to make sure it is within specifications.
b. Check for leaks downstream from the sensor, where contamina-

tion may be leaking into the system.

If there are no leaks and the zero gas is OK, the sensor may need to be
replaced. Check warranty, and contact Analytical Instruments Customer Ser­vice.

4.4.2 Span Cal

The

Span

button on the front panel is used to span calibrate the analyzer.

Span calibration can be performed in either the automatic or manual mode.

CAUTION: If you are spanning the Cal Range by itself (multiple

application analyzers only), use

manual mode

zeroing.
If you want to calibrate ALL of the ranges at once

(multiple application analyzers only), use

auto mode

spanning in the Cal Range.

Make sure the span gas is flowing to the instrument.

4.4.2.1 Auto Mode Spanning

Observe all precautions in sections 4.4 and 4.4.2, above. Press
enter the span function. The screen that appears allows you to select whether the
span calibration is to be performed automatically or manually. Use the

4-14

Teledyne Analytical Instruments

Span

∆∆

∆∇

∆∆

to

Thermal Conductivity Analyzer Operation 4

arrow keys to toggle between AUTO and MAN span settling. Stop when
AUTO appears, blinking, on the display.

Select span
mode: AUTO

Press

Enter

to move to the next screen.

Span Val: 2Ø.ØØ %
<ENT> To begin span

Use the < > arrow keys to toggle between the span concentration value

and the units field (%/ppm). Use the

∆∆

∆∇ arrow keys change the value and/or the

∆∆

units, as necessary. When you have set the concentration of the span gas you are
using, press

Enter

to begin the Span calibration.

#### % O 2  N 2
Slope=##### Span

The beginning span value is shown in the upper left corner of the display.
As the span reading settles, the screen displays and updates information on
Slope. Spanning automatically ends when the span output corresponds, within
tolerance, to the value of the span gas concentration. Then the instrument auto­matically returns to the analyze mode.

4.4.2.2 Manual Mode Spanning

Press

Span

to start the

Span

function. The screen that appears allows
you to select whether the span calibration is to be performed automatically or
manually.

Select span
mode: MANUAL

Use the ∆∇ keys to toggle between AUTO and MAN span settling. Stop

when MAN appears, blinking, on the display. Press

Enter

to move to the next

screen.

Span Val: 2Ø.ØØ %
<ENT> To begin span

Use the < > arrow keys to toggle between the span concentration value

and the units field (%/ppm). Use the

∆∆

∆∇ arrow keys change the value and/or the

∆∆

units, as necessary. When you have set the concentration of the span gas you are
using, press

Enter

to begin the Span calibration.

Press

calibration.

Enter

to enter the span value into the system and begin the span

Teledyne Analytical Instruments

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4 Operation Model 2000A-EU

Once the span has begun, the microprocessor samples the output at a
predetermined rate. It calculates the difference between successive samplings
and displays this difference as Slope on the screen. It takes several seconds for
the first Slope value to display. Slope indicates rate of change of the Span
reading. It is a sensitive indicator of stability.

##### % O2  Air
Slope=#### Span

When the Span value displayed on the screen is sufficiently stable, press

Enter

. (Generally, when the Span reading changes by 1 % or less of the range
being calibrated for a period of ten minutes it is sufficiently stable.) Once
is pressed, the Span reading changes to the correct value. The instrument then
automatically enters the

Analyze

function.

Enter

4.5 The

The Model 2000 is equipped with 2 fully adjustable concentration alarms
and a system failure alarm. Each alarm has a relay with a set of form “C" con­tacts rated for 3 amperes resistive load at 250 V ac. See Figure in Chapter 3,
Installation and/or the Interconnection Diagram included at the back of this
manual for relay terminal connections.

The system failure alarm has a fixed configuration described in chapter 3
Installation.

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
contaminant concentration rises above the setpoint. Setting an
alarm as LOW triggers the alarm when the contaminant
concentration falls below the setpoint.

Alarms

Function

4-16

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?

Teledyne Analytical Instruments

Thermal Conductivity Analyzer Operation 4

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.

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 non­alarm 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 4.3.3 to enter
your password. Once you have clearance to proceed, enter the

Press the

Alarm

button on the front panel to enter the

Alarm

Alarm

function.

function.

Make sure that 01 is blinking.

Sel rng to set alm:
 > Ø 1 Ø 2 Ø 3 < 

Set up the Range 1 alarm by moving the blinking over to 01 using the < >
arrow keys. Then press Enter. Check the gas application and range limits as
displayed on the screen.

Gas use: C3H8  He
Range: 0  10 %

Press enter again to set the alarm setpoints.

Sel %/ppm alm to set
AL1PPM AL2PPM

Use the

∆∆

∆∇ keys to choose between % and ppm units. Then press

∆∆

to move to the next screen.

AL1: 1ØØØ p p m H I
Dft:N Fs:N Ltch:N

Five parameters can be changed on this screen:

Teledyne Analytical Instruments

Enter

4-17

4 Operation Model 2000A-EU

• Value of the alarm setpoint, AL–1 ####

• Out-of-range direction, HI or LO

• Defeated? Dft:Y/N (Yes/No)

• Failsafe? Fs:Y/N (Yes/No)

• 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.

• 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
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. (Toggle it to 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

The

Range

of analysis (MANUAL), or to select automatic range switching (AUTO).

In the MANUAL screen, you are further allowed to define the high and low

(concentration) limits of each Range, and select a single, fixed range to run.

Range

function allows you to manually select the concentration range

Select Function

Alarms

CAUTION: If this is a linearized application, the new range must

be within the limits previously programmed using the
System function, if linearization is to apply through­out the range. Furthermore, if the limits are too small
a part (approx 10 % or less) of the originally linear­ized range, the linearization will be compromised.

In the AUTO screen, you are further allowed to select which gas applica-

tion (PREVIOUSLY defined in

4-18

Teledyne Analytical Instruments

System

function) to run.

Thermal Conductivity Analyzer Operation 4

4.6.1 Manual (Select/Define Range) Screen

The Manual range-switching mode allows you to select a single, fixed
analysis range. It then allows you to redefine the upper and lower limits, for the
range.

Press

Range

Note: If all three ranges are currently defined for different applica-

tion gases, then the above screen does not display (because
mode must be manual). Instead, the LCD goes directly to the
following screen.

key to start the Range function.

Select range
mode: MANUAL

If above screen displays, use the ∆∇ arrow keys to Select MANUAL, and
press

Enter.

Select range to run
> Ø1 Ø2 Ø3 CAL<

Use the < > keys to select the range: 00, 01, 02, or 03. (04 is for future
expansion.) Then press

Enter

.

Gas use: O2  N2
R a n g e : Ø  1 6 %

Use the < > keys to toggle between the Range: low-end field and the
Range: high-end field. Use the

Press

Escape

to return to the previous screen to select or define another

∆∆

∆∇ keys to change the values of the fields.

∆∆

range.

Press

Enter

to return the to the

Analyze

function.

4.6.2 Auto (Single Application) Screen

The Auto screen requires you to select an application (previously defined in
the

System

function. It then automatically places all ranges previously defined

for that application in queue for automatic range switching.

In the autoranging mode, the microprocessor automatically responds to
concentration changes by switching ranges for optimum readout sensitivity. If the
upper limit of the operating range is reached, the instrument automatically shifts
to the next higher range. If the concentration falls to below 85% of full scale of
the next lower range, the instrument switches to the lower range. A correspond­ing shift in the DC concentration output, and in the range ID outputs, will be
noticed.

Teledyne Analytical Instruments

4-19

4 Operation Model 2000A-EU

The autoranging feature can be overridden so that analog output stays on a
fixed range regardless of the contaminant concentration detected. If the concen­tration exceeds the upper limit of the range, the DC output will saturate at 1 V dc
(20 mA at the current output).

However, the digital readout and the RS-232 output of the concentration
are unaffected by the fixed range. They continue to read beyond the full-scale
setting until amplifier saturation is reached. Below amplifier saturation, the
overrange readings are accurate UNLESS the application uses linearization over
the selected range.

The concentration ranges can be redefined using the

Range

Manual screen, and the application gases can be redefined using the

function

System

function, if they are not already defined as necessary.

CAUTION: Redefining applications or ranges might require

relinearization and/or recalibration.

To setup automatic ranging:

Press

Range

Note: If all three ranges are currently defined for different applica-

tion gases, then the above screen does not display (because
mode must be manual). Instead, the VFD goes directly to the
following screen.

key to start the Range function.

Select range mode
Range mode : AUTO

If above screen displays, use the ∆∇ arrow keys to Select AUTO, and
press

Enter.

Select auto ranging
Gas use: O2  N2

Use the ∆∇ arrow keys to change the application (gas use:).

Press

Escape

to return to the previous screen to select or define another

range.

Press

Enter

to return the to the

Analyze

function.

4.6.3 Precautions

The Model 2000 allows a great deal of flexibility in choosing ranges for
automatic range switching. However, there are some pitfalls that are to be
avoided.

4-20

Teledyne Analytical Instruments

Thermal Conductivity Analyzer Operation 4

Ranges that work well together are:

• Ranges that have the same lower limits but upper limits that differ
by approximately an order of magnitude

• Ranges whose upper limits coincide with the lower limits of the
next higher range

• Ranges where there is a gap between the upper limit of the range
and the lower limit of the next higher range.

Range schemes that are to be avoided include:

• Ranges that overlap

• Ranges whose limits are entirely within the span of an adjoining
range.

Figure 4-2 illustrates these schemes graphically.

Figure 4-2: Examples of Autoranging Schemes

4.7 The

Normally, all of the functions automatically switch back to the

function when they have completed their assigned operations. Pressing the

Escape

function. Alternatively, you can press the
to analyzing your sample.

application gases in the first line, and the range in the second line. In the lower

button in many cases also switches the analyzer back to the

The

Analyze

Analyze

function screen shows the impurity concentration and the

Teledyne Analytical Instruments

Function

Analyze

Analyze

Analyze

button at any time to return

4-21

4 Operation Model 2000A-EU

right corner, the abbreviation Anlz indicates that the analyzer is in the

Analyze

mode. If there is an * before the Anlz, it indicates that the range is linearized.

19.3 % O2  Air
R: ØØ:Ø 17 *Anlz

If the concentration detected is overrange, the first line of the display blinks

continuously.

4.8 Programming

CAUTION: The programming functions of the Set Range and

Curve Algorithm screens are configured at the facto­ry to the users application specification. These func­tions should only be reprogrammed by trained,
qualified personnel.

To program, you must:

1. Enter the password, if you are using the analyzer’s password
protection capability.

2. Connect a computer or computer terminal capable of sending an
RS-232 signal to the analyzer RS-232 connector. (See chapter 3
Installation for details). Send the rp command to the analyzer.

OR

For software 1.1.4 or later, turn the instrument off and back on.
While on the introduction screen hold the Analyze key for at least
fifteen seconds. Press the Enter key twice to return to the
Analyze mode.

3. Press the

Use the < > arrow keys to blink MORE, then press

System

button to start the

CONTRAST AUTOCAL
PWD LOGOUT MORE

System

Enter

MODEL APPLICATION
SELF_TEST ALGORITHM

function.

.

Now you will be able to select the APPLICATION and ALGORITHM

set-up functions.

Contrast Function is

(Refer to Section 1.6)

DISABLED

4-22

Teledyne Analytical Instruments

Thermal Conductivity Analyzer Operation 4

4.8.1 The Set Range Screen

The Set Range screen allows reprogramming of the three analysis ranges
and the calibration range (including impurity gas, background gas, low end of
range, high end of range, and % or ppm units). Original programming is usually
done at the factory according to the customer’s application. It must be done
through the RS-232 port using a computer running a terminal emulation program.

Note: It is important to distinguish between this

ming subfunction and the
operator control. The Set Range Screen of the
tion allows the user to DEFINE the upper and lower limits of a
range AND the application of the range. The
function only allows the user to select or define the limits, or
to select the application, but not to define the application.

Range

button function, which is an

System

System

Range

program-

func-

button

Normally the Model 2000 is factory set to default to manual range selec­tion, unless it is ordered as a single-application multiple-range unit (in which case
it defaults to autoranging). In either case, autoranging or manual range selection
can be programmed by the user.

In the autoranging mode, the microprocessor automatically responds to
concentration changes by switching ranges for optimum readout sensitivity. If the
upper limit of the operating range is reached, the instrument automatically shifts
to the next higher range. If the concentration falls to below 85% of full scale of
the next lower range, the instrument switches to the lower range. A correspond­ing shift in the DC concentration output, and in the range ID outputs, will be
noticed.

The autoranging feature can be overridden so that analog output stays on a
fixed range regardless of the contaminant concentration detected. If the concen­tration exceeds the upper limit of the range, the DC output will saturate at 1 V dc
(20 mA at the current output).

However, the digital readout and the RS-232 output of the concentration
are unaffected by the fixed range. They continue to read beyond the full-scale
setting until amplifier saturation is reached. Below amplifier saturation, the
overrange readings are accurate UNLESS the application uses linearization over
the selected range.

To program the ranges, you must first perform the four steps indicated at
the beginning of section 4.8 Programming. You will then be in the second

System

menu screen.

MODEL APPLICATION
SELF_TEST ALGORITHM

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4-23

4 Operation Model 2000A-EU

Use the < > arrow keys again to move the blinking to APPLICATION and

Enter

press

.

Select rng to set appl:
> Ø1 Ø2 Ø3 CAL <

Use the ∆∇ arrow keys to increment/decrement the range number to 0, 1,

2, or 3, and press

Enter

.

Imp: Ø2 Bck: N2
FRØ TO1ØØ %

Use the < > arrow keys to move to Imp: (impurity), Bck: (background),

FR: (from—lower end of range), TO: (to—upper end of range), and PPM or %.

Use the ∆∇ arrow keys to increment the respective parameters as desired.

Press

Enter

to accept the values and return to

Analyze

mode. (See note

below.) Repeat for each range you want to set.

Note: The ranges must be increasing from low to high, for example,

if Range 1 is set to 0–10 % and Range 2 is set to 0–100 %, then
Range 3 cannot be set to 0–50 % since that makes Range 3
lower than Range 2.

Ranges, alarms, and spans are always set in either percent or ppm units, as
selected by the operator, even though all concentration-data outputs change
from ppm to percent when the concentration is above 9999 ppm.

Note: When performing analysis on a fixed range, if the concentra-

tion rises above the upper limit as established by the operator
for that particular range, the output saturates at 1 V dc (or 20
mA). However, the digital readout and the RS-232 output
continue to read regardless of the analog output range.

To end the session:

If started with the RS-232, send:

st<enter>
st<enter>

to the analyzer from the computer.

If started through the front panel, turn the instrument off and back on.
Press the Enter key twice to return to the Analyze mode.

4.8.2 The Curve Algorithm Screen

The Curve Algorithm is a linearization method. It provides from 1 to 9
intermediate points between the ZERO and SPAN values, which can be normal-

4-24

Teledyne Analytical Instruments

Thermal Conductivity Analyzer Operation 4

ized during calibration, to ensure a straight-line input/output transfer function
through the analyzer.

Each range is linearized individually, as necessary, since each range will

usually have a totally different linearization requirement. Before setting the

algorithm curve, each range must be Zeroed and Spanned.

To linearize the ranges, you must first perform the four steps indicated at

the beginning of section 4.8 Programming. You will then be in the second

System

menu screen.

MODEL APPLICATION
SELF_TEST ALGORITHM

4.8.2.1 Checking the linearization

Enter

From the

.

System

Function screen, select ALGORITHM, and press

Range linearization
 > Ø 1 Ø 2 Ø 3 < 

Use the < > keys to select the range: 01, 02, or 03. Then press

Range: Ø 16 %
Gas use: O2  N2

Press Enter again.

Algorithm setup:
VERIFY SET UP

Select and

Enter

VERIFY to check whether the linearization has been

accomplished satisfactorily.

Dpt INPUT OUTPUT
Ø Ø.ØØ Ø.ØØ

The leftmost digit (under Dpt) is the number of the data point being moni-

tored. Use the ∆∇ keys to select the successive points.

The INPUT value is the input to the linearizer. It is the simulated output of

the analyzer. You do not need to actually flow gas.

Enter

.

The OUTPUT value is the output of the linearizer. It should be the ACTU-

AL concentration of the span gas being simulated.

If the OUTPUT value shown is not correct, the linearization must be

corrected. Press

TER

SET UP to Calibration Mode screen.

ESCAPE

to return to the previous screen. Select and

Teledyne Analytical Instruments

EN-

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4 Operation Model 2000A-EU

Select algorithm
mode : AUTO

There are two ways to linearize: AUTO and MANUAL: The auto mode
requires as many calibration gases as there will be correction points along the
curve. The user decides on the number of points, based on the precision re­quired.

The manual mode only requires entering the values for each correction
point into the microprocessor via the front panel buttons. Again, the number of
points required is determined by the user.

Note: Before performing section 4.8.2 or 4.8.2.3, you must check to

ensure that your calibration gases or points are between low
end and high end of the range setup. All correction points
must be between Zero and Span concentrations. Do not enter
Zero and Span points as part of the correction.

4.8.2.2 Manual Mode Linearization

To linearize manually, you must have previous knowledge of the nonlinear
thermal-conductivity characteristics of your gases. You enter the value of the
differential between the actual concentration and the apparent concentration
(analyzer output). Analytical Instruments has tabular data of this type for a large
number of gases, which it makes available to customers on request. See Appen­dix for ordering information. To enter data:

From the

1. Use < > to select ALGORITHM , and

2. Select and

3.

System

Enter

MANUAL from the Calibration Mode Select screen.

Functions Screen—

Enter

SETUP.

Dpt INPUT OUTPUT
Ø Ø.ØØ Ø.ØØ

Enter

.

The data entry screen resembles the verify screen, but the gas values can
be modified and the data-point number cannot. Use the < > keys to toggle
between the INPUT and OUTPUT fields. Use the ∆∇ keys to set the value for
the lowest concentration into the first point. Then press

Enter

.

After each point is entered, the data-point number increments to the next
point. Moving from the lowest to the highest concentration, use the ∆∇ keys to
set the proper values at each point.

4-26

Dpt INPUT OUTPUT
1 Ø.ØØ Ø.ØØ

Teledyne Analytical Instruments

Thermal Conductivity Analyzer Operation 4

Repeat the above procedure for each of the data points you are setting (up
to nine points: 0-8). Set the points in unit increments. Do not skip numbers. The
linearizer will automatically adjust for the number of points entered.

When you are done, Press
for calculation, appears briefly, and then the main

To end the session:

If started with the RS-232, send:

st<enter>
st<enter>

to the analyzer from the computer.

If started through the front panel, turn the instrument off and back on.
Press the Enter key twice to return to the Analyze mode.

4.8.2.3 Auto Mode Linearization

To linearize in the Auto Mode, you must have on hand a separate calibra­tion gas for each of the data points you are going use in your linearization. First,
the analyzer is zeroed and spanned as usual. Then, each special span gas, for
each of the intermediate calibration points, is flowed, in turn, through the sensor.
As each gas flows, the differential value for that intermediate calibration point is
entered from the front panel of the analyzer.

Before starting linearization, perform a standard calibration. See section

4.4. To enter data:

ESCAPE

. The message, Completed. Wait

System

screen returns.

From the

1. Use < > to select ALGORITHM , and

2. Select and

3.

The Auto Linearize Mode data entry screen appears.

5. Use the ∆∇ keys to set the proper value, and

6. Repeat step 5 for each of the special calibration gases, from the

To end the session:

If started with the RS-232, send:

System

Enter

MANUAL from the Calibration Mode Select screen.

step for each cal-point number as it appears in the Input (x)
parentheses.

lowest to the highest concentrations. Press

Functions screen—

Enter

.

Enter

SETUP.

1.3 % O2  Air
Input(Ø) :5.94

Enter

Escape

Teledyne Analytical Instruments

. Repeat this

when done.

4-27

4 Operation Model 2000A-EU

st<enter>
st<enter>

to the analyzer from the computer.
If started through the front panel, turn the instrument off and back on.

Press the Enter key twice to return to the Analyze mode.

4.9 Special Function Setup

4.9.1 Output Signal Reversal

Some applications require a reversal of the output signals in order for the
4-20mA and 0-1 V DC output signals to correspond with the low and high end
of the concentration range. For example, if an application involves the analysis
of 85% oxygen in a background of argon by measuring the thermal conductivity
of the binary gas, the analyzer would normally be set up so that the 100%
oxygen (0% argon) concentration would correspond to the zero level (4mA 0 V)
of the output signal. Then, 85% oxygen (15% argon) would correspond to
20mA (1 V) in the signal output.

It may be convenient for the user to have the outputs reversed so that the
85-100% oxygen level outputs a 4-20mA (0-1 V) signal respectively. This can
be accomplished by reversing the data input to the custom settings. Not all
applications will require a reversing function, however, if this is desirable, it must
be specified at the time of purchase or alternatively, by substituting a linearizing
PC board with the reversal information contained therein. Contact the factory
for further information.

4.9.2 Special - Inverting Output

NOTE: If the unit has a range or ranges that specified >0 unit setup

for inverting.

The steps are:

1. Press RANGE key.

2. Use LEFT/RIGHT key to move to the range that is speci-

fied as inverting output.

3. Press and hold DOWN key for approximate 5 to 7 seconds.

4-28

Teledyne Analytical Instruments

Thermal Conductivity Analyzer Operation 4

4. Press ENTER key.

NOTE: If the inverting has been setup, “i” shall display on the left

bottom corner. Otherwise, the left bottom corner display ”n”.

If more that one range as specified as inverting output, repeat steps 1

to 4.

4.9.3 Special - Polarity Coding

NOTE: This setup will be identified only when performing

or calculation. The formula 1 will determine the range(s) is
required polarity coding.

If VFD negative with it proper span gas or the calculation is not satisfied,

set the S1 accordingly to the table below:

Close S1-5 range 1
Close S1-6 range 2
Close S1-7 range 3
Close S1-8 cal range

Press I/O to restart the system.

4.9.4 Special - Nonlinear Application Gain Preset

NOTE: This section apply during

has more than one range install with nonlinear output applica­tion.

GAS TEST

routine for the unit that

The steps are as follows:

1. Set unit range to lowest range reading.

GAS TEST

2. Using the computer generated settings for the controller,
adjust the controller settings for the maximum span gas

output.

3. Press SPAN key. Select AUTO mode and setup the setting
to span level. Press ENTER key to span.

4. Set range switch to next range.

5. Press SPAN key.

Teledyne Analytical Instruments

4-29

4 Operation Model 2000A-EU

6. Press and hold the RIGHT key for approximate 5 to 7
seconds.

7. Select AUTO and set the reading to span gas level. Press
ENTER key.

Repeat steps 1 to 7 if more than two ranges need to be setup.

4-30

Teledyne Analytical Instruments

Thermal Conductivity Analyzer Maintenance 5

Maintenance

5.1 Routine Maintenance

Aside from normal cleaning and checking for leaks at the gas connec­tions, routine maintenance is limited to replacing fuses, and recalibration. For
recalibration, see Section 4.4 Calibration.

WARNING: SEE WARNINGS ON THE TITLE PAGE OF THIS

MANUAL.

5.2 System Self Diagnostic Test

1. Press the

2. Use the < > arrow keys to move to More, and press

3. Use the < > arrow keys to move to Self-Test, and press

The following failure codes apply:

System

Table 5-1: Self Test Failure Codes

Power

0OK
1 5 V Failure
2 15 V Failure
3 Both Failed

Analog

button to enter the system mode.

Enter

Enter

.

.

0OK
1 DAC A (0–1 V Concentration)
2 DAC B (0–1 V Range ID)
3 Both Failed

(Continued)

Teledyne Analytical Instruments

5-1

5 Maintenance Model 2000A-EU

Preamp

0OK
1 Zero too high
2 Amplifier output doesn't match test input
3 Both Failed

Cell

0OK
1 Failed (open filament, short to ground, no

power.)

2 Unbalance (deterioration of filaments, blocked

tube)

5.3 VFD Display

NOTE: Vaccum Fluorescent Display is used. It does not need

contrast adjustment.

If you cannot read anything on the VFD, especially after first powering

up, check thead VFD cable is not loose.

5.4 Fuse Replacement

1. Place small screwdriver in notch, and pry cover off, as shown in
Figure 5-1.

5-2

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.

Teledyne Analytical Instruments

Thermal Conductivity Analyzer Maintenance 5

3. Replace fuse as shown in Figure 5-2.

4. Reassemble Housing as shown in Figure 5-1.

American Fuses European Fuses

Figure 5-2: Installing Fuses

5.5 Major Internal Components

The Cell Compartment and Front Panel PCBs are accessed by unlatch­ing and swinging open the front panel, as described earlier. The balance of
the PCBs are accessed by removing the rear panel retaining screws and
sliding out the entire subassembly. See Figure 5-3, below. The major elec­tronic components locations are shown in Figure 5-4 (with Cell Compart­ment removed for clarity).

WARNING: SEE WARNINGS ON THE TITLE PAGE OF THIS

MANUAL.

CAUTION: The front and rear panels and all parts of the instru-

ment case must be tightly closed for CE mark com­pliance to be in effect.

The 2000A contains the following major components:

• Analysis Section
Cell Compartment
Cell Block

• Power Supply

• Preamp and Motherboard with Microcontroller

• Display Board and Displays
5 digit LED meter
2 line, 20 character, alphanumeric, VFD display

• Rear Panel Board.

Teledyne Analytical Instruments

5-3

5 Maintenance Model 2000A-EU

X

X

X

X

Figure 5-3: Rear Panel Retaining Screws

To detach the rear panel, remove only those screws marked with an X.

X

X

X

X

X

X

Figure 5-4: Locations of Printed Circuit Board Assemblies

See the drawings in the Drawings section in back of this manual

for details.

5-4

Teledyne Analytical Instruments

Thermal Conductivity Analyzer Maintenance 5

5.6 Cell, Heater, and/or Thermistor

Replacement

The Thermal Conductivity Cell, with its Heater and Thermistor, is
mounted inside the insulated cell compartment, just behind the analyzer's
front panel access door. To remove the one of these components, you must
first slide the entire Cell Compartment out of the analyzer through the front
panel access door as described in the procedure below. Figure 5-5 identifies
the five screws that must be removed in order to remove the Cell Compart­ment.

5.6.1 Removing the Cell Compartment

WARNING: IF THE MODEL 2000 ANALYZER HAS BEEN USED

WITH TOXIC GASES, FLUSH IT THOROUGHLY
BEFORE PERFORMING THIS PROCEDURE.

WARNING: DISCONNECT ALL POWER TO THE MODEL 2000

BEFORE PERFORMING THIS PROCEDURE. FAIL­URE TO DO SO, MAY CAUSE ELECTRIC SHOCK.

Figure 5-5: Location of Cell Compartment Retaining Screws

To remove the Cell Compartment:

a. Disconnect gas and electrical connections to the analyzer.

Teledyne Analytical Instruments

5-5

5 Maintenance Model 2000A-EU

b. Remove analyzer from its mounting, and remove gas fittings

from the gas ports on the bottom of the analyzer, so that nothing
projects from the ports.

c. Remove the Cell Compartment retaining screws identified in

Figure 5-5. You will have to unlatch and swing open the front
panel door to remove the front screws.

d. Carefully pull the Cell Compartment out through the front of the

analyzer. There is enough length to the cell's electrical wiring to
allow this.

e. After replacing the necessary component and reassembling the

Cell Compartment, Replace the Compartment by reversing the
above procedure, steps a through d.

5.6.2 Removing and Replacing the Cell Block

a. Refer to Figure 5-6, which illustrates removal of the Cell Block

from the Cell Compartment. Exploded view is as seen from the
top of the Cell Block.

5-6

Figure 5-6: Removal of Cell from Cell Housing

b. Remove the two screws holding the front mounting bracket—

they also hold the Cell Block Cover to the Cell Block—and then
pull off the cover.

Teledyne Analytical Instruments

Thermal Conductivity Analyzer Maintenance 5

c. Turn the uncovered Cell Block assembly over so that the bottom

faces you. The black rectangular block with four screws is the
Heater Block. Separate the Heater Block and Insulator from the
Cell Block by removing the four screws. Leave the Heater Block
electrical connections connected.

d. Remove the four screws from each of the black plates that hold

the Cell. The Cell is sandwiched between the plates. You should
now be able to slide the Cell free.

e. Leave the electrical connections connected at the Cell. Unlace the

cabling, and unplug the grey Cell cable at the Preamplifier PCB
connector, J3. (See Figure 5-4, and/or drawings at the rear of this
manual.) The Preamplifier PCB can be more easily accessed by
removing the analyzer's rear panel. (See Section 5.5.)

f. Replace the cell by reversing the above procedure, steps a

through e.

5.6.3 Removing the Heater and/or Thermocouple

a. Refer to Figure 5-7, which illustrates removal of the Thermistor

and/or Heater from the Cell Compartment. Exploded view is as
seen from the bottom of the Cell Block.

Figure 5-7: Removing the Heater and/or Thermocouple

b. Remove the two screws holding the front mounting bracket—

they also hold the Cell Block Cover to the Cell Block—and then
pull off the cover.

c. Turn the uncovered Cell Block assembly over so that the bottom

faces you. The black rectangular block with four screws is the
Heater Block.

Teledyne Analytical Instruments

5-7

5 Maintenance Model 2000A-EU

d. The Heater is fastened to the Heater Block by a set screw as well

as the silicone sealing compound. The Thermistor is fastened
only by the silicone sealer.

1

(1) To remove the Heater, use a

/16 ″ Allen wrench to loosen the

Thermistor set screw. Then, grasp BOTH Heater wires
firmly, and pull the Heater slowly out of the Heater Block,
breaking the silicone seal. Do not allow any foreign matter to
enter the empty duct.

(2) To remove the Thermistor, grasp BOTH Thermistor wires

firmly, and pull the Thermistor slowly out of the Heater
Block, breaking the silicone seal. Do not allow any foreign
matter to enter the empty duct.

e. Undo the cable lacing and separate the Heater/Thermistor wires.

Then, disconnect the wires from TS1 on the Temperature Control
Board. (See Figures 5-4 and 5-7.)

5.6.4 Replacing the Heater and/or Thermocouple

a. To replace the Heater and/or Thermocouple, coat the new

element with silicone sealing compound, and insert it into the
duct.

CAUTION: The larger duct is for the Heater element, and the

smaller duct is for the Thermocouple.

b. Enough sealing compound should be on the element to spill over

and seal around the wire where it enters the duct. Smooth the
outer seal and remove any excess.

c. Reassemble the Cell Compartment by reversing the procedure in

section 5.6.3. Then relace the cabling.

d. Reinstall the Assembled Cell Compartment by reversing the

procedure in section 5.6.1. Then reconnect the wires to TS1 on
the Temperature Control board.

5.7 Cleaning

If instrument is unmounted at time of cleaning, disconnect the instru­ment from the power source. Close and latch the front-panel access door.
Clean outside surfaces with a soft cloth dampened slightly with plain clean
water. Do not use any harsh solvents such as paint thinner or benzene.

5-8

Teledyne Analytical Instruments

Thermal Conductivity Analyzer Maintenance 5

For mounted instruments, DO NOT wipe the front panel while the
instrument is controlling your process. Clean the front panel as prescribed in
the above paragraph.

5.8 Phone Numbers

Customer Service: [phone]

Environmental Health and Safety: [phone], Extension 230

Fax: [phone]

TWX: [phone] TDYANYL COID

EMERGENCY ONLY: (24-hour pager) 1-800-759-7243

PIN # 1858192

Teledyne Analytical Instruments

5-9

5 Maintenance Model 2000A-EU

5-10

Teledyne Analytical Instruments

Thermal Conductivity Analyzer Appendix

Appendix

A-1 Specifications

Ranges: Three ranges plus a cal range, field selectable

within limits (application dependent) and Auto
Ranging

Display: 2 line by 20 alphanumeric VFD accompanied by

5 digit LED display

Accuracy: ±1% of full scale for most binary mixtures at

constant temperature
±5% of full scale over operating temperature

range once temperature equilibrium has been
reached

Response Time: 90% in less than 50 seconds

System Operating

Temperature: 32°F to 122°F (0 - 50°C)

Sensor Type: Standard TC cell (4-filament detector)

Signal Output: Two 0-1 VDC (concentration and range ID)

Two 4-20 mADC isolated (concentration and
range ID)

Alarm: Two fully programmable concentration alarm

set points and corresponding Form C, 3 amp
contacts.

One system failure alarm contact to detect
power, calibration, zero / span and sensor
failure.

Teledyne Analytical Instruments

A-1

Appendix Models 2000A-EU

System Power

Requirements: 110 VAC, 50-60Hz

Dimensions: 7.5”H x 10.8 “w X 13.7”D

Cell Material: Nickel plated brass block with nickel alloy

filaments and stainless steel plates

O/P Interface: Full duplex RS-232, implement a subset of

Tracs Command

Mounting:

Standard: General purpose flush panel mounting

Options: General purpose rack mounted to contain

either one or two in a 19” rack mountable
plate

Relative Humidity: Up to 99%

Altitude: 1,609 m

* Other configurations, including a totally

explosion-proof, are available

A-2

Teledyne Analytical Instruments

Thermal Conductivity Analyzer Appendix

A-2 Recommended 2-Year Spare Parts List

QtyQty

Qty

QtyQty

Part NumberPart Number

Part Number

Part NumberPart Number

DescriptionDescription

Description

DescriptionDescription

1 C65507A Back Panel Board
1 C62371A Front Panel Board
1 C65098 Preamplifier Board
1 C73870D Main Computer Board
1 B68772 Temp Control Board
1* F9 Fuse, 1 A, 250 V, 3AG, Slow Blow, (US)
2* F1275 Fuse, 1 A, 250 V, 5 × 20 mm, T—Slow Blow, (European)
1 CP1798 Plug, 50 pin D-sub Connector
1 CP1802 Shielded Cable Clamp
50 CP1799 Solder Cup Contact, for CP1798

___________________

*Select set of fuses accordingly

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 91749-1580

Phone [phone], Fax [phone]
TWX [phone] TDYANYL COID

or your local representative.

A-3 Drawing List

C-66922: Wiring Diagram / Interconnect Drawing
D-67956 Piping Diagram
D-67915 Outline Diagram

Teledyne Analytical Instruments

A-3

Appendix Models 2000A-EU

CALIBRATION PROCEDURE FOR Models 2000 & 2010 ANALYZER

For TURBINE GENERATOR APPLICATION

The ranges for this analyzer are:

Range 1: 0-100% Air in CO2
Range 2: 0-100% H2 in CO2
Range 3: 80-100% H2 in Air

Cal Range: 0-20% N2-H2

The following instructions show how to calibrate each range in the analyzer
independently. If all ranges must be calibrated using the Cal range, go to the cal
range calibration section and following the instructions.

CALIBRATE RANGE 1

1 Select the RANGE function on the main menu and place the analyzer in Range

1. DO THIS, EVEN IF ANALYZER IS IN RANGE 1.

2 Feed zero gas to analyzer and purge for the time needed to get readings that are

leveled. Feed CO2 to the analyzer

3 Press ZERO. You have the option to select AUTO or MANual. AUTO lets the

analyzer adjust itself and may take longer while in MANual mode the operator
has to adjust the zero reading on the display manually using the Up and Down
arrows.

4 Press ZERO select manual press the arrow > hold until OK is displayed in the

upper right corner of the VFD display.

5 If you choose manual, you first will do the Coarse zero adjustment using the Up

and Down arrows. Adjust until display reads as close to zero as you can then
press Enter. Now do the Fine zero adjustment using the Up and Down arrows
until the display reads as close to zero as possible then press Enter. Now the
analyzer will do the final step which is the Software zero adjustment. No input
is required and the analyzer will return automatically to the Analyze mode when
done.

A-4

6 When the analyzer finishes the zero, feed the span gas and purge for the time

needed to get readings that are leveled. Feed Air to the analyzer

Teledyne Analytical Instruments

Thermal Conductivity Analyzer Appendix

7 Press the SPAN button, press the arrow > hold it until OK appears on the upper

right corner of the VFD display.

8 You have the option to select AUTO or MANual. AUTO lets the analyzer

adjust itself and may take longer while in MANual mode the operator has only
to press Enter when he thinks the reading is stable enough. Set the Span value
to 100.00%.

9 The analyzer should end the span by itself if AUTO was selected or when you

press the Enter button if MANual was selected.

10 This range is now calibrated.

CALIBRATE RANGE 2

1 Select the RANGE function on the main menu and place the analyzer in Range

2. DO THIS, EVEN IF ANALYZER IS IN RANGE 2.

2 Feed zero gas to analyzer and purge for the time needed to get readings that are

leveled. Feed CO2 to the analyzer

3 Press ZERO. You have the option to select AUTO or MANual. AUTO lets the

analyzer adjust itself and may take longer while in MANual mode the operator
has to adjust the zero reading on the display manually using the Up and Down
button.

4 Press ZERO select manual press the arrow > hold until OK is displayed in the

upper right corner of the VFD display.

5 If you choose manual, you first will do the Coarse zero adjustment using the Up

and Down arrows. Adjust until display reads as close to zero as you can then
press Enter. Now do the Fine zero adjustment using the Up and Down arrows
until the display reads as close to zero as possible then press Enter. Now the
analyzer will do the final step which is the Software zero adjustment. No input
is required and the analyzer will return automatically to the Analyze mode when
done.

Teledyne Analytical Instruments

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Appendix Models 2000A-EU

6 When the analyzer finishes the zero, feed the span gas and purge for the time

needed to get readings that are leveled. Feed H2 to the analyzer.

7 Press the SPAN button, press the arrow > hold it until OK appears on the upper

right of the VFD display.

8 You have the option to select AUTO or MANual. AUTO lets the analyzer

adjust itself and may take longer while in MANual mode the operator has only
to press Enter when he thinks the reading is stable enough. Set the Span value
to 100.00%.

9 The analyzer should end the span by itself if AUTO was selected or when you

press the Enter button if MANual was selected.

10 This range is now calibrated.

CALIBRATE RANGE 3

1 Select the RANGE function on the main menu and place the analyzer in Range

3. DO THIS, EVEN IF ANALYZER IS IN RANGE 3.

2 Feed zero gas to analyzer and purge for the time needed to get readings that are

leveled. Feed H2 to the analyzer

3 Press ZERO. You have the option to select AUTO or MANual. AUTO lets the

analyzer adjust itself and may take longer while in MANual mode the operator
has to adjust the 100% reading on the display manually using the Up and Down
button.

4 Press ZERO select MANual, press arrow > hold until OK is displayed in the

upper right corner of the VFD display.

5 you choose manual, you first will do the Coarse zero adjustment using the Up

and Down arrows. Adjust until display reads as close to 100.00% as you can
then press Enter. Now do the Fine zero adjustment using the Up and Down
button until the display reads as close to 100.00% as possible then press Enter.

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Teledyne Analytical Instruments

Thermal Conductivity Analyzer Appendix

Now the analyzer will do the final step which is the Software zero adjustment.
No input is required and the analyzer will return automatically to the Analyze
mode when done.

6 When the analyzer finishes zero, feed span gas and purge for the time needed

to get readings that are leveled. Feed 90% H2 in air to the analyzer.

7 Press the SPAN button, press the arrow > hold until OK appears on the upper

right corner of the VFD display.

8 You have the option to select AUTO or MANual. AUTO lets the analyzer

adjust itself and may take longer while in MANual mode the operator has only
to press Enter when he thinks the reading is stable enough. Set the Span value
to 80.00%.

9 The analyzer should end the span by itself if AUTO was selected or when you

press the Enter switch if MANual was selected.

10 This range is now calibrated.

CALIBRATE CAL RANGE

1 Select the RANGE function on the main menu and place the analyzer in the Cal

Range.

2 Feed zero gas to analyzer and purge for the time needed to get readings that are

leveled. Feed H2 to the analyzer

3 Now select the ZERO function from the main menu and press Enter.

If you want to calibrate only the Cal Range:
select MANual.
If you want to calibrate all ranges:
select AUTO.

4 If you choose manual, you first will do the Coarse zero adjustment using the Up

and Down arrows. Adjust until display reads as close to zero as you can then
press Enter. Now do the Fine zero adjustment using the Up and Down button
until the display reads as close to zero as possible then press Enter. Now the
analyzer will do the final step which is the Software zero adjustment.

Teledyne Analytical Instruments

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Appendix Models 2000A-EU

Now the analyzer will do the final step which is the Software zero adjustment.
No input is required and the analyzer will return automatically to the Analyze
mode when done.

5 When the analyzer finishes the zero, feed the span gas and purge for the time

needed to get readings that are leveled. Feed 10% Air in H2 (90% H2 in air)

to the analyzer

6 Now select the SPAN function from the main menu and press Enter.

If you want to calibrate only the Cal Range:
select MANual.
If you want to calibrate all ranges:
select AUTO.

Set the span value to 20.0%.

7 The analyzer should end the span by itself if AUTO was selected or when you

press the Enter if MANual was selected.

8 This range is now calibrated, and if it was AUTO calibrated, all ranges have

been calibrated.

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Teledyne Analytical Instruments