Teledyne 326, 327, 328 User Manual

Models 326, 7, & 8

Oxygen Analyzers

Instruction Manual

Teledyne Analytical Instruments

P/N M33776

6/29/95

i

Notice

Important safety information is to be found on
the following page, under the title

Notice

manual under the title

, and on the last three pages of this

Material Safety Data

Important

Be sure all personnel involved in the installa­tion and operation of this equipment under­stand this information and are impressed
with its importance.

Note

Specific Application Information for the in­strument with which this manual is supplied
is on page iv just prior to the Table of Con-

.

tents.

ii

Teledyne Analytical Instruments

Copyright © 1994 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 Brown Engineering 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 acknowledgments 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 (TAI), 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.

Teledyne Analytical Instruments

iii

Specific Application DataSpecific Application Data

Specific Application Data

Specific Application DataSpecific Application Data

TAI Sales Order Number:

Customer Order Number:

Instrument Model Number:

Instrument Serial Number:

Micro-Fuel Cell Class:

Accuracy:

Response and Recovery:

Operating Temperature Range:

Range of Analysis:

Output Signal Voltage:

Output Signal Current:

Alarm Setpoint #1:

Alarm Setpoint #2:

Special Features (may be covered by addendum.):

iv

Teledyne Analytical Instruments

Table of Content

1 Introduction

1.0 Series Description ....................................................................... 1-1

1.1 Model Designations .................................................................... 1-2

1.2 Models 326R Description ........................................................... 1-2

1.3 Models 327R Description ........................................................... 1-3

1.4 Models 327RAC/RBC Description............................................. 1-3

1.5 Models 328R Description ........................................................... 1-4

1.6

2 Operational Theory

2.1 Principles of Operation ............................................................... 2.1

2.1.1 Micro-Fuel Cell Sensor................................................ 2.3

2.1.2 Sample System............................................................. 2.3

2.1.3 Electronics and Signal Processing ............................... 2.5

3 Operations

3.1 Front Panel Controls................................................................... 3.1

3.2 Modes of Operation .................................................................... 3.2

Cold Start-Up ....................................................................... 3.5

Calibration Zeroing ............................................................... 3.6

Calibration Using Span Gas .................................................. 3.8

Select Active Sensor ............................................................. 3.11

Install Sensor and Test Alternate Sensor .............................. 3.12

O2 Range Set-Up................................................................... 3.14

Set-up Alarms ....................................................................... 3.15

Logger Set-Up ...................................................................... 3.17

Set-Up Clock Functions........................................................ 3.19

Changing Passwords For Remote

Monitoring and Control ............................................ 3.21

System Statistics ................................................................... 3.23

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v

4 Installation

4.1 Unpacking the Analyzer.............................................................. 4.1

4.2 Micro-Fuel Cell Installation or Replacement .............................. 4.2

4.3 Electrical Connections ................................................................ 4.2

Front Panel............................................................................ 4.4

Rear Panel ............................................................................. 4.4

Voltage Selection.................................................................. 4.6

Fuse Changing....................................................................... 4.7

Parallel and Serial Ports ........................................................ 4.8

4.4 Gas Line Connections ................................................................. 4.9

4.5 Installation Checklist................................................................... 4.10

5 Maintenance & Troubleshooting

5.1 Routine Maintenance .................................................................. 5.1

5.2 Troubleshooting.......................................................................... 5.2

Appendices

A.1 Specifications Sheet ................................................................... A.1

A.2 Spare Parts List .......................................................................... A.3

A.3 Material Safety Data Sheet ........................................................ A.4

vi

Teledyne Analytical Instruments

IntroductionIntroduction

Introduction

IntroductionIntroduction

326, 327, and 328) analyzers use a unique Micro-Fuel Cell to measure the
concentration of oxygen in a gas stream. The analyzer can be housed in a
compact equipment case, a 19-inch rack mount unit, an explosion-proof
bulkhead-mounted enclosure, or separately from the panel-mounted control
unit.

Model 326/327/328Model 326/327/328

Model 326/327/328

Model 326/327/328Model 326/327/328

Introduction

The Teledyne Analytical Instruments (TAI) Model 326 series (Models

The Micro-Fuel Cell (U.S. Patent No. 3,429,796) is a maintenance-free,
disposable, solid-state unit whose performance and usable life are guaran­teed by TAI. The cell consumes oxygen from the gas around it and gener­ates a proportional microampere current. The low level signal is then ampli­fied by a solid-state, integrated circuit (IC) amplifier. The resulting DC
signal drives a temperature compensation circuit for the cell, and an integral
meter. The output signal is available at the analyzers terminal strip and is
linear over the specified ranges of analysis. It is suitable for driving a high­impedance recording device.

The Micro-Fuel Cell responds accurately to the presence of oxygen,
regardless of flowrate. The measuring cell does not generate an output
current unless oxygen is present in the sample gas. Therefore, the instru­ment has an absolute zero, and no zero gas is required to standardize the
analyzer. The analyzer can be calibrated using atmospheric air as a span
gas, providing one of the three ranges of analysis encompasses the oxygen
content of air.

The Model 326 series analyzers have three standard ranges: 0–5 % O
0=10 % O2, and 0–25 % O2.

In some instances an outer enclosure may contain the analyzer and other
related devices, such as sample system components or other analyzers.
These special designs are supported by special drawings included with the
standard drawings at the rear of the instruction manual. Use those drawings
in conjunction with the standard drawings, and note any differences.

,

2

Specific models in the 326 series are described in the following para­graphs. Be sure to read the description of the model you have purchased.

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See

Specific Application Information

Table of Contents.

The basic model number of each of the analyzers (326, 327, and 328)
has a suffix that describes the options included. Suffixes for the standard
options are listed below.

R: Electronic motherboard designed with receptacles for

A: Panel mount
B: Bulkhead mount

O: Isolated current output

-2: Dual alarm setpoint
X: Special configuration as specified at the time of order.

C: CENELEC (Comité Européen de Normalisation

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1.1 Model Designation

standardized plug-in support circuitry, such as linearized or
custom output modules.

Electrotecnique) version.

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for your instrument in front of the

Section 1Section 1

Section 1

Section 1Section 1

1.2 Models 326R Description

The Model 326R is a general purpose version designed for use in non­hazardous areas. The electronics circuits, Micro-Fuel Cell, and other sample
handling components are all packaged as a single unit. In some applications,
such as the Model 9150 Flue Gas system, the immediate enclosure may not
be used, since the entire system is housed in a system enclosure. In those
cases the electronics are mounted upon a backplate, rather than within the
Model 326 enclosure.

Mounting styles for the analyzer include panel mount (Model 326RA),
surface or bulkhead mount (Model 326RB), and bulkhead mount NEMA-4
(Model 326RBN). Though the physical appearance differs according to the
mounting style, analyzer functions are the same.

Sample flow controls for the Model 326R are mounted on a gas selector
panel below or to the right of the front panel. Electrical controls and
terminal strip are accessible from the back of the analyzer in the 326RA and
behind the front panel, which swings open, in the 326RB. The sensor is
located behind the door on the front panel of the analyzer. The flow rate is
displayed by a flowmeter, which is mounted on, to the right of, or behind
the control panel. In other cases, a separate panel may be used to contain
valves for sample selection and flow control. When the analyzer is used as
part of a system, various means of sample handling may be used A piping

1-2

Teledyne Analytical Instruments

IntroductionIntroduction

Introduction

IntroductionIntroduction

diagram is then included with the drawings in the instruction manual to
illustrate the sample flow path.

specific explosion-proof design is dependent on area classification and the
specific installation. For example, the analysis section of the 327R contain­ing the Micro-Fuel Cell, and related conditioning components, can be
housed in an explosion-proof enclosure. If the sensor is placed within the
process or in a flow-through block, such that the explosion-proof classifica­tion is maintained, then no analysis section enclosure may be necessary.

aluminum enclosure with a screw-on cover, and is separate from the control
unit, which can be either panel mounted (327RA) or bulkhead mounted
(326RB). The sensor and the electrical interconnections are accessed by
removing the cover on the explosion-proof analysis section. Interconnecting
wiring is fed through sealed fittings in the wall of the enclosure. A sample/
calibrate selector valve and a flow control/flow meter are normally attached
to the outer right-hand wall of the enclosure. The entire analysis section
conforms to the area classification specified at the time of purchase (usually
Class I, Div. I, Group D).

Model 326/327/328Model 326/327/328

Model 326/327/328

Model 326/327/328Model 326/327/328

1.3 Models 327R Description

Model 327R is a semi-explosion-proof version of the 326R series. The

The standard Model 327R analysis section is a bulkhead-mounted, cast

The control unit is designed for remote mounting in nonhazardous areas
and is basically the same control unit as is used for the Model 326R, except
that the measuring cell and related sample handling components are placed
in the analysis section. Panel mount (327RA) and bulkhead mount (327RB)
styles are available for the control unit.

1.4 Models 327RAC/327RBC Description

The 327RAC and 327RBC models have separate control, analysis, and
probe units. The analysis units can be controlled remotely.

In models approved by CENELEC (Comité Européen de Normalisation
Electronique), safety-barrier boxes isolate the probes from the control units,
making them intrinsically safe. In addition, the probes are approved by
BASEEFA (British Approvals Service for Electrical Equipment in Flam­mable Atmospheres).

The control unit of the 327RAC/RBC has an integral meter, power on­off switch and range switch, protective fuses, sample path selection capabil­ity, calibration (span) control, and the various plug-in printed circuit boards

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used to provide both the optional circuitry and the standard electronics
features of the analyzer.

1.5 Models 328R Description

Model 328R is a fully explosion-proof version of the Model 326R and is
completely contained in one or more explosion-proof enclosures as needed
to house the specific components used. Since both the electronics control
and the sample analysis sections of the analyzer must meet hazardous area
classification, they are normally enclosed in a single enclosure and fitted
with explosion-proof operators for switches and potentiometers. These
protrude through the sealed enclosure, which also has a viewing window to
allow observation of the measurement meter.

A commonly used option with the Model 328R is the gas selector panel.
The panel provides selection and flow control of sample or span gas. Sealed
connectors carry the selected gas to the measuring cell inside the explosion­proof instrument enclosure.

Section 1Section 1

Section 1

Section 1Section 1

1.6 Models 328RC Description

The Model 328RC Trace Oxygen Analyzer was designed to meet
CENELEC operating standards for European use.

The Model 328RC is housed in an explosion-proof enclosure with a
BASEEFA EExdIIBT6 rating. So that the explosion-proof enclosure does
not have to be opened, the span adjustment, range selection, and alarm
setpoint controls are placed on the exterior of the enclosure.

The analyzer has a separate probe that is attached to a control unit. The
control unit contains safety barriers (see Chapter 2 for more information).

Note:Note:

Note:

Note:Note:

If installed, safety barriers should always be used. It is the user’sIf installed, safety barriers should always be used. It is the user’s

If installed, safety barriers should always be used. It is the user’s

If installed, safety barriers should always be used. It is the user’sIf installed, safety barriers should always be used. It is the user’s
responsibility for installing the probe in an appropriate sampleresponsibility for installing the probe in an appropriate sample

responsibility for installing the probe in an appropriate sample

responsibility for installing the probe in an appropriate sampleresponsibility for installing the probe in an appropriate sample
system and protecting it from environmental factors such as tem-system and protecting it from environmental factors such as tem-

system and protecting it from environmental factors such as tem-

system and protecting it from environmental factors such as tem-system and protecting it from environmental factors such as tem­perature and RFI.perature and RFI.

perature and RFI.

perature and RFI.perature and RFI.

The Model 328RC contains modular plug-in-type printed circuit boards
(PCB) for temperature regulation, voltage-to-current conversion, compara­tor alarms, power supplies, and oxygen amplifier circuit. The plug-in PCBs
greatly enhance troubleshooting and repair, since entire circuits can be
stocked as spare parts.

Some of the PCBs contain calibration adjustments, which are shown on
the board schematics. For example, the meter is adjusted with a potentiom­eter on the motherboard.

1-4

Note:Note:

Note:

Note:Note:

Before supplying power to the analyzer, be sure to check the wiringBefore supplying power to the analyzer, be sure to check the wiring

Before supplying power to the analyzer, be sure to check the wiring

Before supplying power to the analyzer, be sure to check the wiringBefore supplying power to the analyzer, be sure to check the wiring

Teledyne Analytical Instruments

IntroductionIntroduction

Introduction

IntroductionIntroduction

design features do vary in accordance with customer requirements, checkdesign features do vary in accordance with customer requirements, check

design features do vary in accordance with customer requirements, check

design features do vary in accordance with customer requirements, checkdesign features do vary in accordance with customer requirements, check
the Specific Application Information, and any addendumsthe Specific Application Information, and any addendums

the Specific Application Information, and any addendums

the Specific Application Information, and any addendumsthe Specific Application Information, and any addendums

manual, where the distinctive features of your instrument are recorded.

0-25 % oxygen. A rotary switch on the control panel is used to select the
desired analysis range. The standard instrument ranges have been chosen to
best cover the oxygen content of flue gas. Upon request at the time the
order is placed, any range or ranges of analysis from 0-1 % up to 0-100 %
oxygen can be provided.

Model 326/327/328Model 326/327/328

Model 326/327/328

Model 326/327/328Model 326/327/328

against the interconnection diagram.against the interconnection diagram.

against the interconnection diagram.

against the interconnection diagram.against the interconnection diagram.

1.7 Standard Features

The following features apply to the standard 326 series analyzers. Since

included in this

1.7.1 Ranges of Analysis1.7.1 Ranges of Analysis

1.7.1 Ranges of Analysis

1.7.1 Ranges of Analysis1.7.1 Ranges of Analysis

The ranges of analysis for standard instruments are 0-5 %, 0-10 %, and

The oxygen content of atmospheric air (20.9 %) falls within the 0-25 %
range. It is recommended for calibration because it eliminates the need for a
span gas. Note, however, that a span gas is required, if the air around the
analysis unit cannot be used to span the instrument (as in hazardous loca­tions), or if an instrument is ordered without the 0-25 % calibration range.

1.7.2 Meter Readout1.7.2 Meter Readout

1.7.2 Meter Readout

1.7.2 Meter Readout1.7.2 Meter Readout

Standard models are equipped with an accurate (±1/2 % linearity)
3-inch analog meter calibrated to show the concentration of the target gas in
the sample. A linear scale provides reliable, accurate readout of the analysis
at any point on the scale. The resolution and accuracy of the meter elimi­nates the necessity of an accessory readout device, unless permanent re­cording or remote indication is required. Digital panel meters are used
when requested by the customer.

1.7.3 Output Signal1.7.3 Output Signal

1.7.3 Output Signal

1.7.3 Output Signal1.7.3 Output Signal

For those applications requiring a remote indication and/or recording of
the sample oxygen, a linear output signal of 0–1 V dc is available at no extra
charge. Unless otherwise specified, the output signal will be 0–1 V dc .

The standard voltage output signal is not suitable for driving low imped­ance devices. Accessory equipment must have an input impedance of
10,000 ohms or more. Refer to the Current Output (E to I Converter)
section later in this chapter for information on that option.

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Inaccuracies caused by varying temperature conditions are inherent in
most methods of analysis employing transducers. To correct for this, a
system composed of a combination of temperature compensation and
control is used in the 326 series.

To protect the Micro-Fuel Cell against damage from low ambient
temperatures and reduce the range required for the compensation circuit,
the analyzer is equipped with a thermostatically controlled heating system
that will not permit the interior of the instrument to drop below 70 °F.

To eliminate the inaccuracies accompanying the positive temperature
coefficient of the Micro-Fuel Cell, a specially selected thermistor and
network of precision resistors is utilized to produce a negative coefficient of
matching characteristics. The variable element (thermistor) in the compen­sation network is physically located in the same assembly as the Micro-Fuel
Cell, so that both devices are exposed to essentially the same temperature
conditions.

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1.7.4 Temperature Control and Compensation1.7.4 Temperature Control and Compensation

1.7.4 Temperature Control and Compensation

1.7.4 Temperature Control and Compensation1.7.4 Temperature Control and Compensation

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Section 1Section 1

Section 1

Section 1Section 1

Compensation techniques for high temperature conditions (up to 125
°F), allow the user to disturb the integrity of the analyzer (by opening the
door or front panel) without the equalibration time that would normally
accompany systems employing only high temperature control. In addition,
the life of the Micro-Fuel Cell is extended by not subjecting it to the high
ambient temperature that would be required in an exclusively temperature­controlled system.

1.7.5 Modular Electronics1.7.5 Modular Electronics

1.7.5 Modular Electronics

1.7.5 Modular Electronics1.7.5 Modular Electronics

The electronic components are mounted on a plug-in printed circuit
board, as are the various optional electronic features, for fast, simple repair.
Although circuit failure is unlikely, plug-in capability of the critical elements
of the circuit facilitates instant solution in the event of a semiconductor
failure—providing the customer backs up his instrument with the recom­mended spare. The faulty circuit board may then be returned to the factory
for repairs. Having an available spare part is usually more economical the
services of highly trained service personnel. The printed circuit assemblies
are preset and adjusted to be instantly interchanged.

1.8 Optional Features

is placed.

1-6

The following optional features are only available at the time the order

Teledyne Analytical Instruments

IntroductionIntroduction

Introduction

IntroductionIntroduction

alarm and/or control relay circuits with setpoints that are adjustable over the
selected analysis range. The contacts of the relay are available for intercon­nection with customer circuitry at the terminal strip provided.

integral control circuitry can be arranged so that the relay is energized
above or below the setpoint. Unless otherwise specified, the control relay in
a single setpoint instrument actuates (de-energizes) when the oxygen con­centration rises above the setpoint, and the relays in a double setpoint
instrument actuate (de-energize) when the oxygen level is outside the
portion of the analysis range between the two setpoints. These configura­tions can be used for power supply failure alarms as well as an oxygen
alarm. The Form “C” relay contacts are rated at 3 A (noninductive).

Model 326/327/328Model 326/327/328

Model 326/327/328

Model 326/327/328Model 326/327/328

1.5.1 Integral Alarm Circuitry1.5.1 Integral Alarm Circuitry

1.5.1 Integral Alarm Circuitry

1.5.1 Integral Alarm Circuitry1.5.1 Integral Alarm Circuitry

A number -1 or -2 appended to the model number indicates one or two

The setpoint is set by a potentiometer with a calibrated-dial. The

1.8.2 E to I Converter1.8.2 E to I Converter

1.8.2 E to I Converter

1.8.2 E to I Converter1.8.2 E to I Converter

TBE also offers a current output signal, so that current-to-pneumatic
devices, as well as low impedance current indicating and/or recording
equipment, may be driven directly without the need of accessory equipment.

The current output option is indicated by an “I” in the model number if
the instrument has a grounded current output option, or an “O” if the
output is isolated. This letter designation will be immediately followed by a
one or two digit number which specifies the maximum output. Thus, O-20
signifies an isolated 4 to 20 mA dc current output. The most common
current outputs used are 1 to 5, 4 to 20, and 10 to 50 mA dc.

By special order, isolated voltage outputs from 0–1 mV up to 0–1 V dc
can be provided.

Some common current outputs are:

1. 1–5 mA dc suitable for devices with from 0 to 6000 ohms impedance.

2. 4–20 mA dc suitable for devices with from 0 to 1500 ohms impedance.

3. 10–50 mA dc suitable for devices with from 0 to 600 ohms impedance.

1.8.3 Optional Feature Packaging1.8.3 Optional Feature Packaging

1.8.3 Optional Feature Packaging

1.8.3 Optional Feature Packaging1.8.3 Optional Feature Packaging

Both the integral-alarm and E-to-I converter options are plug-in printed
circuit boards for quick replaceability. When either or both the options are
employed in an instrument, a highly-regulated differential power supply
(also a plug-in type printed circuit board) is included to supply the positive
and negative voltage required by the semiconductor circuitry.

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Section 1Section 1

Section 1

Section 1Section 1

1-8

Teledyne Analytical Instruments

Operational TheoryOperational Theory

Operational Theory

Operational TheoryOperational Theory

The analysis is specific for oxygen; i.e., the measuring cell will not
generate an output current unless oxygen is present in the sample gas. Thus,
the instrument has an absolute zero, and no zero gas is required to operate
the analyzer.

Operational TheoryOperational Theory

Operational Theory

Operational TheoryOperational Theory

2.1 Method of Analysis2.1 Method of Analysis

2.1 Method of Analysis

2.1 Method of Analysis2.1 Method of Analysis

Model 326/327/328Model 326/327/328

Model 326/327/328

Model 326/327/328Model 326/327/328

The measuring cell has the ability to respond accurately to the presence
of oxygen irrespective of flowrate. TBE recommends using ambient air as a
span gas or, if that is not possible, using a known calibration gas of about
80% of the range of interest value.

The measuring cell (U.S. Pat. #3,429,796) is a solid-state maintenance­free structure that carries a TBE guarantee for performance and usable life.
The cell consumes oxygen from the gas surrounding it and generates a
proportional microampere current. The low level signal is then amplified by
a solid-state operational amplifier, and the resulting DC signal is suitable for
driving a high impedance recording device, a temperature compensation
circuit for the cell, and an integral 0-100 µA meter. The output signal is
linear over the specified ranges of analysis.

Temperature compensation maintains a cell output accuracy of ±5% from 0
°C to 50 °C (32 °F to 125 °F) or ±2% of scale at any constant temperature
between the above extremes. Accuracy is limited only by the accuracy of the
recording or indicating device used with the analyzer.

2.2 Transduction and Temperature Compensation2.2 Transduction and Temperature Compensation

2.2 Transduction and Temperature Compensation

2.2 Transduction and Temperature Compensation2.2 Transduction and Temperature Compensation

The TBE 326 Series Oxygen Analyzers utilize a unique electrochemical
transducer whose features include:

1) Specificity for oxygen.

2) Maintenance-free operation.

3) Long calibration interval and life.

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4) Easy disposal.

5) Low cost.

The transducer functions as a fuel cell; in this instance, the fuel is oxy­gen. Oxygen diffusing into the cell reacts chemically to produce an electrical
current that is proportional to the oxygen concentration in the gas phase
immediately adjacent to the cell’s sensing surface.

Since the cell has a positive temperature coefficient, this variable must
be eliminated. The useful life of the cell is limited by the total amount of
current produced throughout its life. Taking these two facts into consider­ation, together with a design goal of providing maximum accuracy, a combi­nation of temperature compensation and temperature control is used.
Temperature compensation using thermistor circuits has been used from 30
to 125 °F (0 to 50 °C). This compensation alone will result in an accuracy
specification of ±2% of full scale or 5% of reading. By adding temperature
control starting at 25 °C (77 °F) and optimizing the thermistor compensa­tion in the interval between 70 and 125 °F, accuracy has been increased to
±1%. Even greater accuracy could be achieved by using only temperature
control and controlling at 125 °F, but the cell life would be reduced by 50%
or more. Therefore, by temperature compensation and temperature control,
TBE has achieved reasonable accuracy consistent with long maintenance­free operation.

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Section 2Section 2

Section 2

Section 2Section 2

2.3 Integral Cell Protection2.3 Integral Cell Protection

2.3 Integral Cell Protection

2.3 Integral Cell Protection2.3 Integral Cell Protection

An N-channel field effect transistor (FET) is incorporated in the cir­cuitry across the cell to short circuit the cell whenever the power to the
instrument is off. The FET switches to a very high resistance instantly when
power is supplied to the analyzer, and is essentially no longer part of the
circuit.

The FET is necessary because of the characteristics of the cell and the
operational amplifier. When in operation, the amplifier input circuit looks
like a short of approximately one ohm to the cell. If the power were inter­rupted without some means of short circuiting the cell, the amplifier would
appear as an open circuit to the cell. Since the cell is a current generating
device, these two circuit extremes (short circuit-open circuit) would neces­sitate a prolonged period of equilibration. With the incorporation of the
FET in the cell circuit, the cell looks into essentially a short circuit at all
times and the instrument responds immediately when power is restored to
the circuit.

2-2

Teledyne Analytical Instruments

Operational TheoryOperational Theory

Operational Theory

Operational TheoryOperational Theory

Model 326/327/328Model 326/327/328

Model 326/327/328

Model 326/327/328Model 326/327/328

2.3 Cell 2.3 Cell

2.3 Cell

2.3 Cell 2.3 Cell

TBE selects the class of cell used in the analyzer to give the best pos-

sible performance for the customer’s sample conditions. Several typical
cells, their 90% response times, output in air, and typical uses are outlined
below:

2.3.1 Class A-3 Cell2.3.1 Class A-3 Cell

2.3.1 Class A-3 Cell

2.3.1 Class A-3 Cell2.3.1 Class A-3 Cell

The Class A-3 cell must be used for any application where the carbon
dioxide content of the sample gas is in the region of from 2 to 100% and the
sample is monitored continuously.

The A-3 cell output is 0.20 mA, and response is 45 seconds.

2.3.2 Class A-5 Cell2.3.2 Class A-5 Cell

2.3.2 Class A-5 Cell

2.3.2 Class A-5 Cell2.3.2 Class A-5 Cell

Class A-5 cells are used in applications where the carbon dioxide con­tent of the sample gas is continuously within the range of 1-100%, and the
sample is monitored intermittently.

The A-5 cell output is 0.19 mA, and response is 45 seconds.

2.3.3 Class B-1 Cell2.3.3 Class B-1 Cell

2.3.3 Class B-1 Cell

2.3.3 Class B-1 Cell2.3.3 Class B-1 Cell

Class B-1 cells are employed in CO2-free (between 0-0.1%) applications
where fast response is important.

TT

ypesypes

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The B-1 cell output is 0.50 mA, and response is 7 seconds.

2.3.4 Class B-3 Cell2.3.4 Class B-3 Cell

2.3.4 Class B-3 Cell

2.3.4 Class B-3 Cell2.3.4 Class B-3 Cell

The B-3 cell is used in applications where a slightly longer response
time is acceptable in order to gain a longer cell life.

The B-3 cell output is 0.30 mA, and the response is 13 seconds.

2.3.5 Class C-3 Cell2.3.5 Class C-3 Cell

2.3.5 Class C-3 Cell

2.3.5 Class C-3 Cell2.3.5 Class C-3 Cell

The Class C-3 cell is employed in CO2-free (between 0-0.1%) applica­tions where a slower response time can be tolerated in the interest of long
cell life.

The C-3 cell output is 0.20 mA, and response is 30 seconds.

2.3.6 Warranty Conditions2.3.6 Warranty Conditions

2.3.6 Warranty Conditions

2.3.6 Warranty Conditions2.3.6 Warranty Conditions

Customers having warranty claims must return the cell in question to the
factory for evaluation. If it is determined that failure is due to faulty material
or workmanship the cell will be replaced free of charge. See Specifications
in the addendum to this manual.

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Section 2Section 2

Section 2

Section 2Section 2

2-4

Teledyne Analytical Instruments

Operational TheoryOperational Theory

Operational Theory

Operational TheoryOperational Theory

Model 326/327/328Model 326/327/328

Model 326/327/328

Model 326/327/328Model 326/327/328

2.3.7 CO2.3.7 CO

2.3.7 CO

2.3.7 CO2.3.7 CO

A graph showing the effects of different concentrations of CO2 on the
C-3 and B-1 cells is displayed on the preceding page.

2.4 Intrinsic Safety Barriers2.4 Intrinsic Safety Barriers

2.4 Intrinsic Safety Barriers

2.4 Intrinsic Safety Barriers2.4 Intrinsic Safety Barriers

Intrinsic safety barriers are used to limit the electrical energy within the
controlled circuit to a level too low to cause ignition of a flammable mate­rial. The intrinsically safe cell block used in the CENELEC-approved units
houses the Micro-Fuel Cell and the temperature compensation thermistor.

The following information has been included in this manual to describe
the operation and maintenance considerations involved with the use of
intrinsic safety barriers. Excerpts from the manufacturer’s literature are
enclosed to assist in use and replacement of the barriers.

The information provided here is in no way intended to serve as advice
of a safety-related nature; its only purpose is to document the components
used.

Any and all hazardous conditions to which the analyzer may be exposed
are characteristic of the user’s environment, and understanding of the
conditions and precautions necessary to safe operation are the user’s re­sponsibility.

Effect on C-3 and B-1 Cells Effect on C-3 and B-1 Cells

Effect on C-3 and B-1 Cells

Effect on C-3 and B-1 Cells Effect on C-3 and B-1 Cells

22

2

22

Bypassing the barriers in any way renders them ineffective.
WARNING: If the instrument is used in any manner inconsistent with

the intent of the intrinsic safety design, the user assumes
all risks.

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Section 2Section 2

Section 2

Section 2Section 2

2-6

Teledyne Analytical Instruments

InstallationInstallation

Installation

InstallationInstallation

InstallationInstallation

Installation

InstallationInstallation

Model 326/327/328Model 326/327/328

Model 326/327/328

Model 326/327/328Model 326/327/328

Note:Note:

Note:

Note:Note:

If you have ordered special options and have obtained a copy ofIf you have ordered special options and have obtained a copy of

If you have ordered special options and have obtained a copy of

If you have ordered special options and have obtained a copy ofIf you have ordered special options and have obtained a copy of
this instruction manual before the instrument is built and fullythis instruction manual before the instrument is built and fully

this instruction manual before the instrument is built and fully

this instruction manual before the instrument is built and fullythis instruction manual before the instrument is built and fully
tested, be aware that special designs and requirements may causetested, be aware that special designs and requirements may cause

tested, be aware that special designs and requirements may cause

tested, be aware that special designs and requirements may causetested, be aware that special designs and requirements may cause
last-minute changes in the sample system, component placement,last-minute changes in the sample system, component placement,

last-minute changes in the sample system, component placement,

last-minute changes in the sample system, component placement,last-minute changes in the sample system, component placement,
conduit connections, etc. which will eventually be covered by anconduit connections, etc. which will eventually be covered by an

conduit connections, etc. which will eventually be covered by an

conduit connections, etc. which will eventually be covered by anconduit connections, etc. which will eventually be covered by an
addendum in the front of the manual, and by new drawings. If youraddendum in the front of the manual, and by new drawings. If your

addendum in the front of the manual, and by new drawings. If your

addendum in the front of the manual, and by new drawings. If youraddendum in the front of the manual, and by new drawings. If your
intention is to install services, accessories, etc., using preliminaryintention is to install services, accessories, etc., using preliminary

intention is to install services, accessories, etc., using preliminary

intention is to install services, accessories, etc., using preliminaryintention is to install services, accessories, etc., using preliminary
information, then you must be aware that changes to your installa-information, then you must be aware that changes to your installa-

information, then you must be aware that changes to your installa-

information, then you must be aware that changes to your installa-information, then you must be aware that changes to your installa­tion may eventually be required. Specially-engineered systems will,tion may eventually be required. Specially-engineered systems will,

tion may eventually be required. Specially-engineered systems will,

tion may eventually be required. Specially-engineered systems will,tion may eventually be required. Specially-engineered systems will,
of course, be bound by the stipulations of the agreement; neverthe-of course, be bound by the stipulations of the agreement; neverthe-

of course, be bound by the stipulations of the agreement; neverthe-

of course, be bound by the stipulations of the agreement; neverthe-of course, be bound by the stipulations of the agreement; neverthe­less, unforeseen factors may in some cases necessitate amend-less, unforeseen factors may in some cases necessitate amend-

less, unforeseen factors may in some cases necessitate amend-

less, unforeseen factors may in some cases necessitate amend-less, unforeseen factors may in some cases necessitate amend­ments to the agreement by mutual consent.ments to the agreement by mutual consent.

ments to the agreement by mutual consent.

ments to the agreement by mutual consent.ments to the agreement by mutual consent.

3.1 Location3.1 Location

3.1 Location

3.1 Location3.1 Location

The analyzer should be installed in an area that is sheltered from the
elements. The instrument case of general purpose models is not to be
considered water tight (although the model 328R has a sealed, explosion­proof enclosure, and the Analysis Section of the model 327R has a sealed,
explosion-proof enclosure). In areas where the ambient temperature is
expected to drop below 0 °F, auxiliary heating must be provided.

In analyzers with a separate probe unit, install the probe with a suitable
sample system in an area that is protected from the elements and from RFI.
The temperature limits are the same as those specified for the sensor, but a
constant temperature will increase accuracy. The sample system must
provide a flow rate of approximately 1000 ml/minute at a constant tempera­ture. Also, the sample system should include some means of introducing a
span gas.

Outline Diagrams showing the location and identification of the gas line
and electrical conduit connections, as well as the physical dimensions of the
analyzer, are included in the Drawings Section at the rear of the manual.

TAI suggests that the mounting holes be line drilled, using the analyzer
itself as a template, after the panel cutout has been made. If the instrument

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housing is designed to be wall or bulkhead mounted, allow sufficient room
for conduit installation on the wiring access side of the unit.

Refer to the Interconnection Diagram and Interconnection Schematic
which are included in the Drawings Section at the rear of this manual. For
Instruments with separate Control and Analysis Units, each unit may have
its own Interconnection Drawings.

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3.2 Electrical Connections3.2 Electrical Connections

3.2 Electrical Connections

3.2 Electrical Connections3.2 Electrical Connections

3.2.1 Power3.2.1 Power

3.2.1 Power

3.2.1 Power3.2.1 Power

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Section 3Section 3

Section 3

Section 3Section 3

Standard Analyzer:

120 volt power, capable of delivering 2 amperes of current continuously, is
required to operate the standard analyzer.

327RAC/RBC and the 328RC::

single-phase, 220 volt, 50/60 hz power capable of delivering 100 watts
continuously. The primary power is delivered throughout the analyzer from
a single point of entry in the control unit. The appropriate 1/2" conduit
access port is identified on the control unit outline diagram. Power service
should include an equipment ground wire of the same gauge as the power
wiring.

Special Design Options::

orders. Consult the Specific Application Information and Drawings sections
and any Special Addendums in the manual for complete details.

Connections are made to a terminal strip. In the 326RA and 327RA, the
terminal strip is located at the rear of the unit. In the 326RB, 327RB/RBC
and 328RC, the terminal is located behind the front door panel. Consult the
electrical interconnection and wiring diagrams in the drawings section at the
rear of the manual for terminal designations. Observe the Hot, Neutral, and
Ground terminals (H, N and G), and install the incoming wiring accordingly.
Connect an equipment ground wire to the terminal marked G on the draw­ing.

A source of single phase, 50 or 60 hertz, 110 to

CENELEC models require a source of

Different requirements may apply to special

For the 327 RA/RB/RAC/RBC and 328R/RC, TAI provides a 4-foot
length of cable. If you need a longer cable, use any approved cable that
meets the requirements specified on drawing C-39909. Be sure the cable is
connected with an approved junction box. The H, N and G wires must be
polarized as indicated on the interconnection diagram. If in doubt, check the
wiring against the interconnection diagram. Then, check the wiring with a
voltmeter to be sure that the H and N wires are not transposed at the barrier
strip. (The neutral should read zero voltage when measured to ground.) The

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Teledyne Analytical Instruments

InstallationInstallation

Installation

InstallationInstallation

ground wire should be securely attached to a cold water pipe so that per­sonnel are afforded maximum short circuit protection.

nated in an appropriate lug. Because of the #6 terminal screw and the
spacing between barrier dividers, TAI recommends that the gauge of the
wire employed not exceed that specified on the interconnection diagram.

signal voltage. Other ranges can be negotiated. Refer to the Specific Appli­cation Data and/or Special Addendum to determine the output signal magni­tude for specials.

ance devices only (i.e., 10,000 ohms minimum). Optional outputs are
required for low impedance devices.

Model 326/327/328Model 326/327/328

Model 326/327/328

Model 326/327/328Model 326/327/328

As with all other barrier strip connections, the wiring should be termi-

3.2.2 Output Signal3.2.2 Output Signal

3.2.2 Output Signal

3.2.2 Output Signal3.2.2 Output Signal
Voltage OutputVoltage Output

Voltage Output

Voltage OutputVoltage Output

All models of the 326 series are equipped to provide a 0-1 V dc output

The output signal, regardless of magnitude, is suitable for high imped-

Two conductor, 22 gauge (AWG), shielded cable is recommended for
interconnecting the signal and the accessory readout device. Polarize the
signal connections as shown on the interconnection diagram (to avoid loss
of signal or possible damage to this instrument or other devices), and

connect the shield to the analyzer onlyconnect the shield to the analyzer only

connect the shield to the analyzer only. Do not connect the shield to the

connect the shield to the analyzer onlyconnect the shield to the analyzer only

accessory instrument, as this will create a ground loop, slowing down the
response from the high impedance device.

In the 327RAC/RBC and 328RC, the conduit port most conveniently
located with respect to the appropriate barrier strip terminals is indicated on
the control unit outline diagram. The conduit access hole is sized for ½" and
¾" conduit.

Current OutputCurrent Output

Current Output

Current OutputCurrent Output

Analyzers with the designation I or O appended to the model number
are equipped with an E to I converter to provide a DC current output
signal, as well as a DC voltage output signal. An O indicates an isolated
output, and one or two digits following the O specify the fullscale output in
milliamps. An I, followed by one or two digits, indicates a negative-ground
output and its fullscale value.

If your instrument is equipped with an isolated current output, be sure
to maintain the isolation of both positive and negative conductors from
ground.

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The standard current output option is 4 to 20 mA dc (O-20 or I-20).
Other ranges can be negotiated. Refer to the Specific Application Data and/
or Special Addendum to determine the output signal magnitude for specials.

The appropriate terminal strip connections and polarizations are identi­fied on the Schematic and Interconnection Diagram. Always observe the
polarity specified on the Schematic and Interconnection Diagrams; other­wise, output indication will be lost, and circuit damage may be caused to the
instrument or other devices involved.

Two-conductor shielded cable is recommended for all signal inter­connections for the best possible signal protection. For explosion-proof and
CENELEC-approved units, consult the control unit outline diagram for the
proper conduit access port to use for wiring.

Important:Important:

Important:

Important:Important:

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Make sure that the impedance of the external circuit does not Make sure that the impedance of the external circuit does not

Make sure that the impedance of the external circuit does not

Make sure that the impedance of the external circuit does not Make sure that the impedance of the external circuit does not
exceed the specified impedance of the current range provided.exceed the specified impedance of the current range provided.

exceed the specified impedance of the current range provided.

exceed the specified impedance of the current range provided.exceed the specified impedance of the current range provided.

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Section 3Section 3

Section 3

Section 3Section 3

3.2.3 Alarm and/or Control Circuitry3.2.3 Alarm and/or Control Circuitry

3.2.3 Alarm and/or Control Circuitry

3.2.3 Alarm and/or Control Circuitry3.2.3 Alarm and/or Control Circuitry

Two relay-contact outputs with electronically controlled adjustable
setpoints are available for controlling customer-provided equipment, such as
an annunciator or shut-down circuitry. They ar available withe normally­open or normally-closed contacts, Higher-than-setpoint or lower-than­setpoint actuation, and for CENELEC models: 3 amperes maximum, non­inductive contacts.

When this circuitry is installed, the model number includes a -2. The
operating characteristics described in the previous paragraph will be docu­mented on the Specific Application Information and/or in an Addendum in
the front of the manual.

CAUTION: Consideration must be given to the energized state of the relaysCAUTION: Consideration must be given to the energized state of the relays

CAUTION: Consideration must be given to the energized state of the relays

CAUTION: Consideration must be given to the energized state of the relaysCAUTION: Consideration must be given to the energized state of the relays

(energized above or below setpoint, and normally-open/normally-(energized above or below setpoint, and normally-open/normally-

(energized above or below setpoint, and normally-open/normally-

(energized above or below setpoint, and normally-open/normally-(energized above or below setpoint, and normally-open/normally-

closed) to ensure failsafe operation when desired.closed) to ensure failsafe operation when desired.

closed) to ensure failsafe operation when desired.

closed) to ensure failsafe operation when desired.closed) to ensure failsafe operation when desired.

Connections are made to the terminal strips provided, as labeled in the
Interconnection Drawings at the rear of the manual.

In models with intrinsic safety barriers, it is vital to know to which side
of the setpoint a given relay is energized so that the proper contacts of the
SPDT relay switch (normally closed or normally open) can be used in the
external circuit. The terms normally open (NO) and normally closed (NC)
refer to

energizedenergized

energized. The NO and NC contacts share the C (for common) contact.

energizedenergized

Any load connected across the NO and C contacts will always see an open
circuit (switched off) when the relay is de-energized. Any load connected

the position of the relay switch when its control solenoid is de-the position of the relay switch when its control solenoid is de-

the position of the relay switch when its control solenoid is de-

the position of the relay switch when its control solenoid is de-the position of the relay switch when its control solenoid is de-

3-4

Teledyne Analytical Instruments

InstallationInstallation

Installation

InstallationInstallation

across the NC and C contacts will always see a closed circuit (switched on)
when the relay is de-energized.

strip terminal inside the control unit. Wiring should be no larger than 18
gauge because the external load must be limited to 3 amperes (non-induc­tive) per relay. All wiring should be installed in the conduit port and be
appropriately identified on the control unit outline diagram.

underside of the analyzer case. Both are identified on the outline diagram.
TAI suggests that Teflon sealing tape be used as a sealant, rather than pipe
dope. Be careful that mated fittings are not cross-threaded before applying
force with a wrench. For most applications, the gas connector block in the
analyzer is aluminum and can be damaged more easily than the fitting it is
mated to.

Model 326/327/328Model 326/327/328

Model 326/327/328

Model 326/327/328Model 326/327/328

Each set of relay switch contacts (NC-C-NO) is assigned its own barrier

3.3 Gas Connections3.3 Gas Connections

3.3 Gas Connections

3.3 Gas Connections3.3 Gas Connections

The sample input, vent, and purge connections are located on the

3.3.1 Pressure Reduction and/or Regulation3.3.1 Pressure Reduction and/or Regulation

3.3.1 Pressure Reduction and/or Regulation

3.3.1 Pressure Reduction and/or Regulation3.3.1 Pressure Reduction and/or Regulation

Unless span gas is specified, the standard 326R analyzer requires only a
pressure-reducing regulator installed at the sample point, and the necessary
interconnecting tubing. The regulator should be set between 5 and 50 psig;
10 psig is nominal.

For the 327RAC/RBC and the 328RC, TAI recommends that the
sample pressure be reduced
344 kPag (68.9 kPag nominal). If the magnitude of the sample pressure
does not exceed 689.5 kPag and is reasonably stable, a simple throttle valve
will be satisfactory. If, on the other hand, the pressure is in excess of 689.5
kPag or vacillates over a wide range, a metallic diaphragm regulator should
be used.

phragm under any circumstances.phragm under any circumstances.

phragm under any circumstances.

phragm under any circumstances.phragm under any circumstances.

pressure reducing regulator installed at the sample point, and the necessary
interconnecting tubing. The regulator should be adjusted to provide a
nominal pressure of 10 psig.

motorized pumps and aspirator syphons driven by air, water, or a combina­tion of the two, are common methods of drawing sample from processes
which do not allow positive pressure sampling. The piping diagram in the
drawings section at the rear of the instrument instruction manual is specific

Do not use a regulator that is equipped with an organic dia-Do not use a regulator that is equipped with an organic dia-

Do not use a regulator that is equipped with an organic dia-

Do not use a regulator that is equipped with an organic dia-Do not use a regulator that is equipped with an organic dia-

For positive-pressure sampling systems, the analyzer may require a

Other configurations may also be used in specially-designed systems:

at the sample pointat the sample point

at the sample point to between 34.5 kPag and

at the sample pointat the sample point

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to the exact configuration of the analyzer covered by the manual, and details
concerning the sample handling system should be taken from that drawing.
The outline drawing provides installation details concerning sample or
calibration gas conduit sizes and connecting points.

In systems with a separate sample probe, you must mount the probe,
provide the sample and calibration system for the analyzer, and make sure
that the probe is protected from the elements and RFI.

The 326R series has been designed to employ air as the calibration gas.
TAI feels that the known oxygen concentration of air (20.9%) is the most
reliable standard available. The volume represented by the cell manifold and
sample passages has been reduced to a minimum so that the instrument will
recover rapidly to the 0-10% range analysis when you follow the proper
calibration procedure. (Calibration gas may be specified.)

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3.3.2 Recommended Span Gas3.3.2 Recommended Span Gas

3.3.2 Recommended Span Gas

3.3.2 Recommended Span Gas3.3.2 Recommended Span Gas

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Section 3Section 3

Section 3

Section 3Section 3

If the ranges of the analyzer do not encompass the oxygen content of
air, span gas will be required to calibrate the instrument. The cylinder span
gas will have to be manifolded with the sample gas externally. TAI can
furnish gas selector panels, in a variety of configurations, to suit the
customer’s needs.

Only a span gas with a certified composition should be used, and the
cylinder must be equipped with a metallic diaphragm regulator. If the span
gas is compressed air (cylinder supplied), a metallic diaphragm-type regula­tor is not required, since diffusion will not alter its oxygen concentration.
When compressed air is supplied by a compressor, a throttle valve should be
adequate.

3.3.3 Vent Connection3.3.3 Vent Connection

3.3.3 Vent Connection

3.3.3 Vent Connection3.3.3 Vent Connection

Wherever possible, vent the analyzer directly to the atmosphere. If
venting directly is not possible, the following conditions must be met in vent
line installation:

1. The vent line must be constructed so that no appreciable
backpressure (from vent line restriction) is experienced by the
analyzer. ¼-inch tubing is recommended.

3-6

2. The vent line must terminate in an area that experiences no more
than normal barometric pressure changes.

3. The vent line must be installed so that water and/or dirt cannot
accumulate in it.

Teledyne Analytical Instruments

InstallationInstallation

Installation

InstallationInstallation

sample gas, however, is beneficial, since it will prevent water loss from the
cell’s electrolyte.

Model 326/327/328Model 326/327/328

Model 326/327/328

Model 326/327/328Model 326/327/328

3.3.4 Sample Conditioning Accessories3.3.4 Sample Conditioning Accessories

3.3.4 Sample Conditioning Accessories

3.3.4 Sample Conditioning Accessories3.3.4 Sample Conditioning Accessories

The sample must be free of entrained solids and water. A high humidity

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Section 3Section 3

Section 3

Section 3Section 3

3-8

Teledyne Analytical Instruments

OperationsOperations

Operations

OperationsOperations

cal wiring installation and fuses be checked against the interconnection
diagram—

other than those responsible for startup and operation. other than those responsible for startup and operation.

other than those responsible for startup and operation. Note that most

other than those responsible for startup and operation. other than those responsible for startup and operation.

electrical connections are made directly to terminal blocks on the
motherboard.

Model 326/327/328Model 326/327/328

Model 326/327/328

Model 326/327/328Model 326/327/328

OperationsOperations

Operations

OperationsOperations

4.1 Preliminary4.1 Preliminary

4.1 Preliminary

4.1 Preliminary4.1 Preliminary

Before supplying power to the instrument, TBE suggests that the electri-

particularly if the installation has been made by personnelparticularly if the installation has been made by personnel

particularly if the installation has been made by personnel

particularly if the installation has been made by personnelparticularly if the installation has been made by personnel

All accessory hardware, fittings, and gas connections between the
analyzer and sample point should be leak tested under pressure prior to
startup.

In many instances, proper attention to these two preliminaries will pre­vent severe damage (accidental wiring transpositions) and ambiguous analy­sis (diffusion leaks into the sampling system).

4.2 Meter Zero4.2 Meter Zero

4.2 Meter Zero

4.2 Meter Zero4.2 Meter Zero

Before applying power to the analyzer (range switch in any position but
OFF), check and adjust (if necessary) the mechanical zero of the analyzer
(except in models using digital meters). The pointer should indicate zero with
the power OFF; if not, adjust the screw on the face of the meter to zero the
pointer. This step is important if full advantage of the accuracy of the meter
is to be realized, and even more important if remote indicating and/or record­ing equipment is involved in the system. An offset on the meter will result in
a tracking error between the two devices, which becomes significant when
the meter is used to calibrate the analyzer.

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4.3 Model 328RC Meter Adjustment (Electrical)4.3 Model 328RC Meter Adjustment (Electrical)

4.3 Model 328RC Meter Adjustment (Electrical)

4.3 Model 328RC Meter Adjustment (Electrical)4.3 Model 328RC Meter Adjustment (Electrical)

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After turning on the instrument power, allow sufficient time for stabiliza­tion. Connect a voltmeter (set to measure at least 1 V dc) between ground (-)
and TP1 (+). Turn the span control knob clockwise until the voltmeter reads

1.00 V dc. The analyzer’s indicating meter should read full scale; if it does
not, then adjust the meter trimmer (P1 on the motherboard) to correct it.

Section 4Section 4

Section 4

Section 4Section 4

Cautions:Cautions:

Cautions:

Cautions:Cautions:

Do not make any adjustments unless necessary.Do not make any adjustments unless necessary.

Do not make any adjustments unless necessary.

Do not make any adjustments unless necessary.Do not make any adjustments unless necessary.

Never attempt to make this adjustment with the power ON.Never attempt to make this adjustment with the power ON.

Never attempt to make this adjustment with the power ON.

Never attempt to make this adjustment with the power ON.Never attempt to make this adjustment with the power ON.

4.4 Measuring Cell Installation4.4 Measuring Cell Installation

4.4 Measuring Cell Installation

4.4 Measuring Cell Installation4.4 Measuring Cell Installation

The Micro-Fuel Cell is supplied separately in a controlled atmosphere
package, and must be installed prior to startup. It is particularly important
with Micro-Fuel Cells that the cell be left in its sealed bag until immediately
before the instrument is to be started up and a source of gas containing CO
is available. To install the cell, use the following procedure:

1) Make sure the range switch is in the OFF position.

2) Open the analysis and/or instrument enclosures, so as to expose
the analysis section components (sample tubing, measuring cell,
etc.)

3) Locate the cell holder assembly (plastic cylinder or metal block
with electrical cable coming out of one end and sample tubing at
the other end). Withdraw the cell probe from holder (use twisting
motion); remove cap by unscrewing counterclockwise.

4) Open the cell package and remove the shorting clip. Remove the
clip from the membrane end first, carefully, making sure not to
touch the sensor membrane.

2

4-2

Caution:Caution:

Caution:

Caution:Caution:

Note:Note:

Note:

Note:Note:

Never press on the sensor membrane.Never press on the sensor membrane.

Never press on the sensor membrane.

Never press on the sensor membrane.Never press on the sensor membrane.

5) Place the Micro-Fuel Cell in the probe with the sensing surface
facing out and the printed circuit contacts (concentric gold rings)
facing the contacts inside the probe body. Replace cap removed
in step 3 (refer to instructions furnished in cell box).

6) Insert the cell probe back into the probe holder by pushing and
twisting slightly until it seats firmly.

Try to limit the amount of time the Micro-Fuel Cell is exposed to air.Try to limit the amount of time the Micro-Fuel Cell is exposed to air.

Try to limit the amount of time the Micro-Fuel Cell is exposed to air.

Try to limit the amount of time the Micro-Fuel Cell is exposed to air.Try to limit the amount of time the Micro-Fuel Cell is exposed to air.

Teledyne Analytical Instruments

OperationsOperations

Operations

OperationsOperations

require a period of time to adjust itself to its new environment. Monitoring
the integral meter, this period of time appears to be about 15 minutes. Actu­ally, there will be a few percentage points of drift for a period of hours after
the first 15 minutes of stabilization. This can be demonstrated by recording
the output on a circular chart recorder for the first 24 hours of operation.

Once it appears to have stabilized (usually about 15 minutes), the slight
instability during the first hours of operation is tolerable. The drift during
this period can easily be compensated by rezeroing before each reading.

required from the very onset of operation. TBE recommends a 24 hour run­in period before operational calibration and service.

Model 326/327/328Model 326/327/328

Model 326/327/328

Model 326/327/328Model 326/327/328

4.5 Initial Calibration and Equilibration4.5 Initial Calibration and Equilibration

4.5 Initial Calibration and Equilibration

4.5 Initial Calibration and Equilibration4.5 Initial Calibration and Equilibration

Before stable operation can be guaranteed, the Micro-Fuel Cell will

The instrument can be placed in service before it is completely stabilized.

If, on the other hand, reliable analysis, free of instrument distortion, is

In either case, employ the following procedure:

1) Turn the analyzer range switch to the 0-25% (or highest range)
position. This establishes power to all components of the analyzer
at minimum sensitivity. If applicable, turn on the accessory
readout device.

2) Connect analyzer input to a supply of span gas or air.

Note:Note:

Note:

Note:Note:

When practical, the instrument may be calibrated by withdrawing theWhen practical, the instrument may be calibrated by withdrawing the

When practical, the instrument may be calibrated by withdrawing the

When practical, the instrument may be calibrated by withdrawing theWhen practical, the instrument may be calibrated by withdrawing the
cell probe from the holder and exposing the cell to the surroundingcell probe from the holder and exposing the cell to the surrounding

cell probe from the holder and exposing the cell to the surrounding

cell probe from the holder and exposing the cell to the surroundingcell probe from the holder and exposing the cell to the surrounding
atmosphere.atmosphere.

atmosphere.

atmosphere.atmosphere.

3) Adjust the throttle valve so that an indicated flowrate of 2.0
SCFH (1000 ml/min) registers on the flowmeter. Wait about
three to five minutes (allow reading to stabilize) before
proceeding to next step.

4) Unlock and adjust the span control potentiometer until the meter
pointer is in coincidence with the CAL mark (black mark on the
red 0-25% scale, at 20.9%) on the meter scale. Relock the span
potentiometer.

Note:Note:

Note:

Note:Note:

If the instrument does not have a 0-25% range, or if the surroundingIf the instrument does not have a 0-25% range, or if the surrounding

If the instrument does not have a 0-25% range, or if the surrounding

If the instrument does not have a 0-25% range, or if the surroundingIf the instrument does not have a 0-25% range, or if the surrounding
atmosphere cannot be used as a span gas, then a span gas will beatmosphere cannot be used as a span gas, then a span gas will be

atmosphere cannot be used as a span gas, then a span gas will be

atmosphere cannot be used as a span gas, then a span gas will beatmosphere cannot be used as a span gas, then a span gas will be
needed. In that case, adjust the span control until the meter reads theneeded. In that case, adjust the span control until the meter reads the

needed. In that case, adjust the span control until the meter reads the

needed. In that case, adjust the span control until the meter reads theneeded. In that case, adjust the span control until the meter reads the
concentration of the span gas.concentration of the span gas.

concentration of the span gas.

concentration of the span gas.concentration of the span gas.

Note:Note:

Note:

Note:Note:

If recorder or remote indicator is used for primary readout, calibrate toIf recorder or remote indicator is used for primary readout, calibrate to

If recorder or remote indicator is used for primary readout, calibrate to

If recorder or remote indicator is used for primary readout, calibrate toIf recorder or remote indicator is used for primary readout, calibrate to

83.9% of full scale on recorder or indicator for maximum accuracy.83.9% of full scale on recorder or indicator for maximum accuracy.

83.9% of full scale on recorder or indicator for maximum accuracy.

83.9% of full scale on recorder or indicator for maximum accuracy.83.9% of full scale on recorder or indicator for maximum accuracy.

Teledyne Analytical Instruments

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5) Connect analyzer input to the sample gas and retrim the throttle
valve for an indicated flowrate of 2.0 SCFH, or insert probe
holder back into its holder.

Section 4Section 4

Section 4

Section 4Section 4

Note:Note:

Note:

Note:Note:

Analyzer accuracy is not affected by variations in sample flowrate. TheAnalyzer accuracy is not affected by variations in sample flowrate. The

Analyzer accuracy is not affected by variations in sample flowrate. The

Analyzer accuracy is not affected by variations in sample flowrate. TheAnalyzer accuracy is not affected by variations in sample flowrate. The
recommended flowrate of 2.0 SCFH insures maximum speed orrecommended flowrate of 2.0 SCFH insures maximum speed or

recommended flowrate of 2.0 SCFH insures maximum speed or

recommended flowrate of 2.0 SCFH insures maximum speed orrecommended flowrate of 2.0 SCFH insures maximum speed or
response.response.

response.

response.response.

6) Select the range of analysis that will provide the best possible
resolution of the oxygen content of the sample gas.

7) Allow sample gas, not calibration air, to flow through the
analyzer. For best results, let sample gas flow through the
analyzer for 24 hours. This allows the Micro-Fuel Cell to
equilibrate.

Important:Important:

Important:

Important:Important:

It is particularly vital to the condition of the A-3 cell employed inIt is particularly vital to the condition of the A-3 cell employed in

It is particularly vital to the condition of the A-3 cell employed in

It is particularly vital to the condition of the A-3 cell employed inIt is particularly vital to the condition of the A-3 cell employed in
flue gas (or high COflue gas (or high CO

flue gas (or high CO

flue gas (or high COflue gas (or high CO
exposed to a COexposed to a CO

exposed to a CO

exposed to a COexposed to a CO
time.time.

time.

time.time.

4.6 Operational Calibration4.6 Operational Calibration

4.6 Operational Calibration

4.6 Operational Calibration4.6 Operational Calibration

-content applications) that the cell not be-content applications) that the cell not be

-content applications) that the cell not be

-content applications) that the cell not be-content applications) that the cell not be

22

2

22

-free environment for a prolonged period of-free environment for a prolonged period of

-free environment for a prolonged period of

-free environment for a prolonged period of-free environment for a prolonged period of

22

2

22

After the 24-hour equilibration period following the installation of any
new cell, or whenever it is desirable to recheck the calibration of the instru­ment, use the following calibration procedure:

1) Place the range selector switch on the 0-25% position.

4-4

2) Connect the analyzer input to a supply of calibration (span) air
and adjust the flowrate to 2.0 SCFH.

3) Unlock and adjust the span control until the meter pointer is in
precise coincidence with the scale calibration mark and relock the
span control.

4) Return the instrument to service by restoring sample flow at the
proper rate (2.0 SCFH), and selecting the range that provides the
best possible resolution of the sample oxygen.

4.7 Calibration of Alarm Equipped Instruments4.7 Calibration of Alarm Equipped Instruments

4.7 Calibration of Alarm Equipped Instruments

4.7 Calibration of Alarm Equipped Instruments4.7 Calibration of Alarm Equipped Instruments

Teledyne Analytical Instruments

OperationsOperations

Operations

OperationsOperations

unlock and rotate the set point dial (or dials) until the limits of travel in the
NORMAL (rather than ALARM) direction have been attained. After sample
flow has been re-initiated, and the proper scale of analysis selected, the alarm
point can be precisely reset by simply re-dialing the set point.

Model 326/327/328Model 326/327/328

Model 326/327/328

Model 326/327/328Model 326/327/328

To prevent generating ambiguous alarms during calibration, simply

4.8 Calibration of Converter-Equipped Instruments4.8 Calibration of Converter-Equipped Instruments

4.8 Calibration of Converter-Equipped Instruments

4.8 Calibration of Converter-Equipped Instruments4.8 Calibration of Converter-Equipped Instruments

Note:Note:

Note:

Note:Note:

The current output spans 4 to 20 mA corresponding to zero to fullThe current output spans 4 to 20 mA corresponding to zero to full

The current output spans 4 to 20 mA corresponding to zero to full

The current output spans 4 to 20 mA corresponding to zero to fullThe current output spans 4 to 20 mA corresponding to zero to full
scale WITHOUT REGARD TO WHICH RANGE THE ANALYZER IS IN. Ifscale WITHOUT REGARD TO WHICH RANGE THE ANALYZER IS IN. If

scale WITHOUT REGARD TO WHICH RANGE THE ANALYZER IS IN. If

scale WITHOUT REGARD TO WHICH RANGE THE ANALYZER IS IN. Ifscale WITHOUT REGARD TO WHICH RANGE THE ANALYZER IS IN. If
the current output is being used to drive a device which must have itsthe current output is being used to drive a device which must have its

the current output is being used to drive a device which must have its

the current output is being used to drive a device which must have itsthe current output is being used to drive a device which must have its
input scaled to the particular analysis range, the customer will beinput scaled to the particular analysis range, the customer will be

input scaled to the particular analysis range, the customer will be

input scaled to the particular analysis range, the customer will beinput scaled to the particular analysis range, the customer will be
required to provide the necessary electrical or mechanical interlocks.required to provide the necessary electrical or mechanical interlocks.

required to provide the necessary electrical or mechanical interlocks.

required to provide the necessary electrical or mechanical interlocks.required to provide the necessary electrical or mechanical interlocks.

When calibrating, remember the following points:

1. With instruments that are attached to recorders, use the recorder
during calibration to improve accuracy. (Most recording
equipment is linear to ±0.25% or better.)

2. Make sure that the sample path flowrate is maintained at 2 SCFH
(1000 ml/min).

Note:Note:

Note:

Note:Note:

Although the output of the cell is entirely independent of the sampleAlthough the output of the cell is entirely independent of the sample

Although the output of the cell is entirely independent of the sample

Although the output of the cell is entirely independent of the sampleAlthough the output of the cell is entirely independent of the sample
flowrate, the response and recovery is not. To achieve the responseflowrate, the response and recovery is not. To achieve the response

flowrate, the response and recovery is not. To achieve the response

flowrate, the response and recovery is not. To achieve the responseflowrate, the response and recovery is not. To achieve the response
and recovery time that is specified on the application informationand recovery time that is specified on the application information

and recovery time that is specified on the application information

and recovery time that is specified on the application informationand recovery time that is specified on the application information
page in the Appendix, the flowrate must be at least 2 SCFH (1000 ml/page in the Appendix, the flowrate must be at least 2 SCFH (1000 ml/

page in the Appendix, the flowrate must be at least 2 SCFH (1000 ml/

page in the Appendix, the flowrate must be at least 2 SCFH (1000 ml/page in the Appendix, the flowrate must be at least 2 SCFH (1000 ml/
min).min).

min).

min).min).

3. Check to be sure that you have placed the range switch on the
position that will give you the best possible resolution of the
sample gas after calibration has been completed.

4.9 Special Shutdown for A-3 Cell4.9 Special Shutdown for A-3 Cell

4.9 Special Shutdown for A-3 Cell

4.9 Special Shutdown for A-3 Cell4.9 Special Shutdown for A-3 Cell

CAUTION:CAUTION:

CAUTION:

CAUTION:CAUTION:

When the Analyzer is equipped with a Class A-3 cell, it must beWhen the Analyzer is equipped with a Class A-3 cell, it must be

When the Analyzer is equipped with a Class A-3 cell, it must be

When the Analyzer is equipped with a Class A-3 cell, it must beWhen the Analyzer is equipped with a Class A-3 cell, it must be
protected from prolonged exposure (more than four hours) to COprotected from prolonged exposure (more than four hours) to CO

protected from prolonged exposure (more than four hours) to CO

protected from prolonged exposure (more than four hours) to COprotected from prolonged exposure (more than four hours) to CO
free atmospheres (such as air).free atmospheres (such as air).

free atmospheres (such as air).

free atmospheres (such as air).free atmospheres (such as air).

The cell can be protected from lack of CO2 by trapping CO2-containing
sample (flue gas) by closing the input manifold valves and sealing the vent
connection with a valve, water trap, or clamped-off plastic tubing.

4.10 Routine Operational Maintenance4.10 Routine Operational Maintenance

4.10 Routine Operational Maintenance

4.10 Routine Operational Maintenance4.10 Routine Operational Maintenance

Teledyne Analytical Instruments

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Check the Sample flow daily to make sure that particulate matter is not

blocking sample flow.

Span calibration should be checked every two to four weeks.

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Sample FlowSample Flow

Sample Flow

Sample FlowSample Flow

4.10.2 Calibration4.10.2 Calibration

4.10.2 Calibration

4.10.2 Calibration4.10.2 Calibration

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Section 4Section 4

Section 4

Section 4Section 4

4-6

Teledyne Analytical Instruments

MaintenanceMaintenance

Maintenance

MaintenanceMaintenance

Model 326/327/328Model 326/327/328

Model 326/327/328

Model 326/327/328Model 326/327/328

Maintenance & Maintenance &

Maintenance &

Maintenance & Maintenance &

5.1 Maintenance5.1 Maintenance

5.1 Maintenance

5.1 Maintenance5.1 Maintenance

5.1.1 Routine Maintenance5.1.1 Routine Maintenance

5.1.1 Routine Maintenance

5.1.1 Routine Maintenance5.1.1 Routine Maintenance

Most 326 series analyzers contain no moving parts (although some
contain an analog meter movement, solenoid, or relay contacts), and there­fore, periodic service is not required. The sample flow check and calibration
outlined in Section 4 should be adequate to keep the analyzer functioning
throughout the life span of a given Micro-Fuel Cell.

Special designs may require sample systems with filter elements, valves,
etc., and those components will require inspection or replacement as needed
to keep the instrument in service. A periodic inspection schedule (once per
week, once per month, etc.) will be sufficient to determine problems before
they become serious.

TT

T

TT

rr

ouboub

r

oub

rr

ouboub

leshootingleshooting

leshooting

leshootingleshooting

5.1.2 Special Shut-Down Precaution for Class A-3 Cell5.1.2 Special Shut-Down Precaution for Class A-3 Cell

5.1.2 Special Shut-Down Precaution for Class A-3 Cell

5.1.2 Special Shut-Down Precaution for Class A-3 Cell5.1.2 Special Shut-Down Precaution for Class A-3 Cell

When the analyzer is equipped with a Class A-3 cell, it must be pro­tected from prolonged exposure (more than 4 hours) to CO2-free atmo­spheres (such as air). This can be accomplished by trapping CO2-containing
sample (flue gas) by closing the input manifold valves and sealing the vent
connection with a valve, water trap or clamped-off plastic tubing.

5.1.3 Cell Replacement5.1.3 Cell Replacement

5.1.3 Cell Replacement

5.1.3 Cell Replacement5.1.3 Cell Replacement

When the Micro-Fuel Cell nears the end of its useful life, sensitivity will
decline very rapidly. The initial response to this phenomenon is to
recalibrate the analyzer. If many turns of span control are required, or if the
control does not have sufficient range to recalibrate the analyzer, a new
Micro-Fuel Cell is required.

Teledyne Analytical Instruments

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Order a replacement cell shortly after the instrument is placed in service,

and each time the cell is replaced thereafter.

CAUTION: DO NOT STOCKPILE SPARE CELLS. Due to the shelf life of the

The spare cell should be carefully stored in an area that is not subject to
large variations in ambient temperature (24°C nominal), and in such a way
as to eliminate any possibility that the cell could be damaged.
the cell package until you are ready to place the cell in the instrument. If
the cell package is punctured and air permitted to enter, the cell will imme­diately begin to react to the presence of oxygen.

After you install the new cell, follow the procedures outlined in the
Startup section (3.2 and 3.3) of the manual.

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cells, only one per instrument should be in reserve.

5.1.4 Cell Warranty5.1.4 Cell Warranty

5.1.4 Cell Warranty

5.1.4 Cell Warranty5.1.4 Cell Warranty

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Do not open

Section 5Section 5

Section 5

Section 5Section 5

If it is determined that failure is due to faulty workmanship or parts, the
cell will be replaced at no cost to the customer. If a cell was working
satisfactorily, but ceases to function before the warranty period expires, the
customer will receive credit, on a pro-rated basis, toward the purchase of a
new cell. Customers with warranty claims must return the cell in question to
the factory for evaluation.

WARNING: Any evidence of tampering, or damage through mishandling,

will make the cell warranty null and void.

5.2 Troubleshooting5.2 Troubleshooting

5.2 Troubleshooting

5.2 Troubleshooting5.2 Troubleshooting

5.2.1 Preliminary Checks5.2.1 Preliminary Checks

5.2.1 Preliminary Checks

5.2.1 Preliminary Checks5.2.1 Preliminary Checks

a. Check Micro-Fuel Cell.

(1) Correct cell type for instrument
(2) Orientation in socket correct.
(3) Shorting clip removed.
(4) Diaphragm undamaged.

b. Check printed circuit boards.

(1) Installed in proper slots.
(2) Inserted fully and making good electrical contact.

5-2

Teledyne Analytical Instruments

MaintenanceMaintenance

Maintenance

MaintenanceMaintenance

d. Instrument has had time to stabilize.
e. Ambient and sample-gas temperatures are in allowable range for the

If the following checks do not give the expected results, problem is

probably in the electronics.

a. Remove Cell: Output should go to zero.
b. Short cell contacts together: Output should go full scale or higher, or

Model 326/327/328Model 326/327/328

Model 326/327/328

Model 326/327/328Model 326/327/328

c. Check calibration gasses: zero, span, and sample are appropriate

types or formulations for the instrument and cell type.

instrument.

5.2.2 Electronics Checks5.2.2 Electronics Checks

5.2.2 Electronics Checks

5.2.2 Electronics Checks5.2.2 Electronics Checks

it should go below zero.

5.2.3 Gas Checks5.2.3 Gas Checks

5.2.3 Gas Checks

5.2.3 Gas Checks5.2.3 Gas Checks

a. Instrument spans OK, but doesn't go to zero with zero gas.

(1) There may be a gas leak: Vary the flow rate. If the detected

oxygen level varies with flow rate, there is a leak (Leaks can be
caused by lose fittings or damaged tubing, or by diffusion
through walls of tubing or other parts of the sampling system. A
diffusion leak is normally so small that it can be detected only by
trace oxygen instruments.)

(2) The zero gas may be contaminated. This in turn can be caused

by improper regulator attachment procedures.

b. Instrument zeros OK, but won't span high enough.

(1) Exhausted or damaged cell. Replace cell. (Cell damage can be

caused by puncturing membrane when removing shorting clip or
from storing the cell at too high a temperature.)

(2) Incorrect cell for application. Check

Specific Cell Information

.

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Section 5Section 5

Section 5

Section 5Section 5

5-4

Teledyne Analytical Instruments

AppendixAppendix

Appendix

AppendixAppendix

AppendixAppendix

Appendix

AppendixAppendix

Model 326/327/328Model 326/327/328

Model 326/327/328

Model 326/327/328Model 326/327/328

A.1 Cell A.1 Cell

A.1 Cell

A.1 Cell A.1 Cell

The Micro-fuel Cell carries a warranty that covers its normal life expectancy
from date of shipment. Several classes of cell are employed in the various
326-series models. Each class carries its own warranty, and selection of the
class cell employed is a function of the customer’s application. The most
common classes of cell, the guidelines governing their use, and the appli­cable warrantees covering each class are summarized in the following table.

CellCell

Cell

CellCell
ClassClass

Class

ClassClass

A-3 6 months 45 seconds 0.20 mA
A-5 6 months 45 seconds 0.19 mA
B-1 6 months 7 seconds 0.50 mA
B-3 12 months 13 seconds 0.30 mA
C-3 12 months 30 seconds 0.20 mA

COCO

Effect on C-3 and B-1 Cells Effect on C-3 and B-1 Cells

CO

Effect on C-3 and B-1 Cells

COCO

Effect on C-3 and B-1 Cells Effect on C-3 and B-1 Cells

22

2

22

A graph showing a plot of a typical curve of the effects of different concen­trations of CO2 on the C-3 and B-1 cells is located in section 2, Operational
Theory.

WW

arranty Infarranty Inf

W

arranty Inf

WW

arranty Infarranty Inf

Warran-Warran-

Warran-

Warran-Warran­ted Lifeted Life

ted Life

ted Lifeted Life

ormationormation

ormation

ormationormation

90% Resp90% Resp

90% Resp

90% Resp90% Resp
TimeTime

Time

TimeTime

OutputOutput

Output

OutputOutput
in Airin Air

in Air

in Airin Air

To be supplied with final review:To be supplied with final review:

To be supplied with final review:

To be supplied with final review:To be supplied with final review:

Specifications
Calibration data ??
Drawings List
MSDS

Teledyne Analytical Instru­ments

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Recommended Spare Parts ListRecommended Spare Parts List

Recommended Spare Parts List

Recommended Spare Parts ListRecommended Spare Parts List

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AppendixAppendix

Appendix

AppendixAppendix

QtyQty

Qty

QtyQty

1* B-29600 PCB: E to I Converter, Isolated (O Option) (not 327RAC)
1* B-14702 PCB: E to I Converter, Neg Gnd (I Option) (not 327RAC)
1* A-9309 PCB: Alarm Comparator (-2 Option) (not 327RAC)
1* B-43812 PCB: Cell Failure Alarm (not 327RAC)
1* A-9306 PCB: Power Supply (used with above options) (not 327RAC)
1 B-30868 PCB: Temperature Controller (326RA/RB or 328R only)
1 A-9348 PCB: Oxygen Amplifier (All Models)
1 B-43812 PCB: Cell Failure Alarm (326RA/RB, 327RA/RB only)
1 T-176 Thermoswitch (327RA/RB only)
5 F-9 Fuse: 3AG, 1 Amp (220 V ac models only)
5 F-10 Fuse: 3AG, 2 Amp (110 V ac models only)
5 F-527 Fuse: 1/4 Amp
1 H-28 Heater (110 V ac models only)
1 H-34 Heater (220 V ac models only)
1 C-6689 Micro-Fuel Cell: Class **
1 A-7023 Cell Contact Spring (All except CENELEC)
1 A-6544 Cell Contact Pin (All except CENELEC)
1 A-33748 Thermistor Assembly (326RA/RB, 328R only)
1 T-366 Thermistor (327RAC only)
1 S-81 Triac (327RA/RB only)
1 D-186 Dial
1 M-41 Meter
1 P-156 Potentiometer: 10 k ohms
1 T-288 Transformer

Part NoPart No

Part No

Part NoPart No

DescriptionDescription

Description

DescriptionDescription

* Optional item. Required only for instruments incorporating the option.

Any of these also require an A-9306 PCB.
EXCEPTIONS: All standard in 328RC. None available in 327RAC.

** Per Sales Order. See Specific Application Data in front of Table of

Contents.

A MINIMUM CHARGE OF $15.00 IS APPLIED TO SPARE PARTS
ORDERS.

IMPORTANTIMPORTANT

IMPORTANT

IMPORTANTIMPORTANT

A-2

: Orders for replacement parts should include the part number: Orders for replacement parts should include the part number

: Orders for replacement parts should include the part number

: Orders for replacement parts should include the part number: Orders for replacement parts should include the part number

(if available) and the model and serial number of the system(if available) and the model and serial number of the system

(if available) and the model and serial number of the system

(if available) and the model and serial number of the system(if available) and the model and serial number of the system
for which the parts are intended.for which the parts are intended.

for which the parts are intended.

for which the parts are intended.for which the parts are intended.

Teledyne Analytical Instruments

AppendixAppendix

Appendix

AppendixAppendix

SEND ORDERS TO :

Teledyne Brown Engineering
Analytical Instruments
I6830 Chestnut Street
City of Industry, California 91749-1580

Telephone [phone]
TWX: [phone] TDYANYL COID
Or your local representative.

B-39931 OUTLINE DIAGRAM - PROBE ASSEMBLY
C-39936 OUTLINE DIAGRAM - SAFETY BARRIER ENCLO­SURE
B-39932 OUTLINE DIAGRAM - CONTROL UNIT
A-8317 PIPING DIAGRAM - SUGGESTED
C-31945 SCHEMATIC - MOTHER PC BOARD
C-39899 SCHEMATIC - INTERCONNECTION
B-33779 SCHEMATIC - OXYGEN AMPLIFIER
C-39909 INTERCONNECTION DIAGRAM
C-39898 WIRING DIAGRAM

D-43287 OUTLINE DIAGRAM - HOUSING
B-39931 OUTLINE DIAGRAM - PROBE
C-43264 WIRING & INTERCONNECTION DIAGRAM
C-31945 SCHEMATIC - MOTHER PC BOARD
C-43265 SCHEMATIC - INTERCONNECTION
B-33779 SCHEMATIC - OXYGEN AMPLIFIER
B-33129 SCHEMATIC - POWER SUPPLY
B-33128 SCHEMATIC - ALARM
B-29602 SCHEMATIC - E/I CONVERTER
Specs page
Calibration data
drawing list
MSDS

REFERENCE DRAWINGSREFERENCE DRAWINGS

REFERENCE DRAWINGS

REFERENCE DRAWINGSREFERENCE DRAWINGS

Model 326RA/RBModel 326RA/RB

Model 326RA/RB

Model 326RA/RBModel 326RA/RB
Model 327RA/RBModel 327RA/RB

Model 327RA/RB

Model 327RA/RBModel 327RA/RB
Model 327RAC/RBCModel 327RAC/RBC

Model 327RAC/RBC

Model 327RAC/RBCModel 327RAC/RBC
MODEL 327RACMODEL 327RAC

MODEL 327RAC

MODEL 327RACMODEL 327RAC

MODEL 328RCMODEL 328RC

MODEL 328RC

MODEL 328RCMODEL 328RC

Model 326/327/328Model 326/327/328

Model 326/327/328

Model 326/327/328Model 326/327/328

Teledyne Analytical Instru­ments

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AppendixAppendix

Appendix

AppendixAppendix

A-4

Teledyne Analytical Instruments

Date: 1/6/04 Time : 01:03:45 PM

Title: G:\MASTER\34000\D3420419.DWG