Teledyne 7300A User Manual

Infrared Gas Analyzer

OPERATING INSTRUCTIONS

Model 7300A

Infrared Gas Analyzer

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DANGER

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

PERSONAL PROTECTIVE EQUIPMENT MAY BE REQUIRED WHEN SERVICING THIS SYSTEM.

HAZARDOUS VOLTAGES EXIST ON CERTAIN COMPONENTS INTERNALLY WHICH MAY PERSIST FOR A
TIME EVEN AFTER THE POWER IS TURNED OFF AND DISCONNECTED.

ONLY AUTHORIZED PERSONNEL SHOULD CONDUCT MAINTENANCE AND/OR SERVICING. BEFORE
CONDUCTING ANY MAINTENANCE OR SERVICING CONSULT WITH AUTHORIZED SUPERVISOR/MANAGER.

Teledyne Analytical Instruments

P/N M00000

10/13/00

ECO # 00-0000

i

Model 7300A

Copyright © 2000 Teledyne Analytical Instruments

All Rights Reserved. No part of this manual may be reproduced, transmitted,
transcribed, stored in a retrieval system, or translated into any other language or computer
language in whole or in part, in any form or by any means, whether it be electronic,
mechanical, magnetic, optical, manual, or otherwise, without the prior written consent of
Teledyne Analytical Instruments, 16830 Chestnut Street, City of Industry, CA 91749-

1580.

Warranty

This equipment is sold subject to the mutual agreement that it is warranted by us
free from defects of material and of construction, and that our liability shall be limited to
replacing or repairing at our factory (without charge, except for transportation), or at
customer plant at our option, any material or construction in which defects become
apparent within one year from the date of shipment, except in cases where quotations or
acknowledgements provide for a shorter period. Components manufactured by others bear
the warranty of their manufacturer. This warranty does not cover defects caused by wear,
accident, misuse, neglect or repairs other than those performed by Teledyne or an autho­rized service center. We assume no liability for direct or indirect damages of any kind and
the purchaser by the acceptance of the equipment will assume all liability for any damage
which may result from its use or misuse.

We reserve the right to employ any suitable material in the manufacture of our
apparatus, and to make any alterations in the dimensions, shape or weight of any parts, in
so far as such alterations do not adversely affect our warranty.

Important Notice

This instrument provides measurement readings to its user, and serves as a tool by
which valuable data can be gathered. The information provided by the instrument may
assist the user in eliminating potential hazards caused by his process; however, it is
essential that all personnel involved in the use of the instrument or its interface, with the
process being measured, be properly trained in the process itself, as well as all instrumen­tation related to it.

The safety of personnel is ultimately the responsibility of those who control process
conditions. While this instrument may be able to provide early warning of imminent
danger, it has no control over process conditions, and it can be misused. In particular, any
alarm or control systems installed must be tested and understood, both as to how they
operate and as to how they can be defeated. Any safeguards required such as locks, labels,
or redundancy, must be provided by the user or specifically requested of Teledyne at the
time the order is placed.

Therefore, the purchaser must be aware of the hazardous process conditions. The
purchaser is responsible for the training of personnel, for providing hazard warning
methods and instrumentation per the appropriate standards, and for ensuring that hazard
warning devices and instrumentation are maintained and operated properly.

Teledyne Analytical Instruments, the manufacturer of this instrument, cannot
accept responsibility for conditions beyond its knowledge and control. No statement
expressed or implied by this document or any information disseminated by the manufac­turer or its agents, is to be construed as a warranty of adequate safety control under the

user’s process conditions.

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Teledyne Analytical Instruments

Infrared Gas Analyzer

Technician Record SheetTechnician Record Sheet

Technician Record Sheet

Technician Record SheetTechnician Record Sheet

The following data is recorded by the technitian at the end of the testing

of the analyzer:

APPLICATION (IMPURITY OF INTEREST):__________________

RANGE 1: FROM____________ TO___________ % / PPM (circle one)

RANGE 2: FROM____________ TO___________ % / PPM (circle one)

RANGE 3: FROM____________ TO___________ % / PPM (circle one)

RANGE 4: FROM____________ TO___________ % / PPM (circle one)

FILTER: __________________

CALIB_FACTOR: __________________

HARD_OFFSET_C: __________________

HARD_OFFSET_F: __________________

SOFTWARE VERSION: ____________

SERIAL #: __________________

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Model 7300A

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Teledyne Analytical Instruments

OPERATING INSTRUCTIONS

Model 7300A

Infrared Gas Analyzer

Table of Contents

Table of Contents

General Purpose

Teledyne Analytical Instruments

i

Model 7300A Infrared Gas Analyzer

Table of Contents

1 Introduction

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

1.2 Typical Gas Applications................................................ 1-1

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

1.4 General .......................................................................... 1-3

1.5 NDIR Analyzer ............................................................... 1-3

2 Installation

2.1 Unpacking the Analyzer ................................................. 2-1

2.2 Installing & Connecting the Analyzer ............................. 2-1

2.2.1 IUser Connections ................................................ 2-2

2.2.2 Electrical Power Connections ............................... 2-2

2.2.3 Calibration Gases ................................................. 2-2

2.2.4 Pipe Connection ................................................... 2-3

2.2.5 Sample Delivery System ....................................... 2-3

2.2.6 Venting the System ............................................... 2-3

2.3 Electrical Connections (rear Panel) ............................... 2-3

2.3.1 Primary Input Power .............................................. 2-4

2.3.2 Fuse Installation .................................................... 2-4

2.3.3 50-Pin Equipment Interface Connector ................. 2-4

2.3.3.1 Analog Outputs .............................................. 2-4

2.3.3.2 Alarm Relays ................................................. 2-6

2.3.3.3 Digital Remote Cal Input................................ 2-7

2.3.3.4 Range ID Relays ........................................... 2-9

2.3.3.5 Network I / O .................................................. 2-9

2.3.3.6 Remote Valve Connector ............................... 2-9

2.3.4 RS-232 Port .......................................................... 2-10

2.4 Gas Requirements ......................................................... 2-12

2.5 Testing the System ......................................................... 2-12

2.6 Calibration ..................................................................... 2-12

2.6.1 Calibration Fluids .................................................. 2-12

2.6.2 Calibration............................................................. 2-13

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Table of Contents

3 Start-up and Theory of Operation .........................................3-1

3.1 Preliminary..................................................................... 3-1

3.2 NDIR Analyzer set-up .................................................... 3-1

3.2.1 Initial Set-up and Zeroing ...................................... 3-1

3.2.2 Operational Calibration ......................................... 3.2

3.3 Theory of Operation ....................................................... 3-2

3.3.1 General................................................................. 3-2

3.4.2 Analyzer ................................................................ 3-3

3.4 Circuit Description ......................................................... 3-5

3.5 Digital Signal Processing & Electronics......................... 3-6

3.6 Linearizer ....................................................................... 3-7

3.7 Control Unit .................................................................... 3-8

3.8 Automatic Function ........................................................ 3-9

4 Operation: Electrical/Control Unit Modes/Functioning

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

4.2 Using the Controls ......................................................... 4-2

4.2.1 Mode/Function Selection ...................................... 4-2

4.2.1.1 Analysis Mode ............................................ 4-2

4.2.1.2 Setup Mode ................................................ 4-4

4.2.2 Data Entry ............................................................. 4-5

4.2.2.1 Enter ........................................................... 3-5

4.2.2.2 Escape ....................................................... 3-5

4.3.2 Setting up Auto-Cal ................................................ 4-6

4.3.3 Password Protection .............................................. 4-7

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

4.3.3.2 Installing or Changing the Password ............. 4-8

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

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

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

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

4.3.8 Trouble Shooting Information ................................. 4-11

4.3.9 Digital Flter Setup .................................................. 4-12

4.3.10 Zero Offset Adjustment .......................................... 4-13

4.3.11 CAL-OUT Funtion .................................................. 4-14

4.4 The

4.4.1 Zero Cal ................................................................. 4-16

Zero

and

Span

Functions ....................................... 4-16

4.4.1.1 Auto Mode Zeroing ........................................ 4-17

3.4.1.2 Manual Mode Zeroing.................................... 4-18

3.4.1.3 Cell Failure .................................................... 4-18

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Model 7300A Infrared Gas Analyzer

4.4.2 Span Cal ................................................................ 4-19

4.4.2.1 Auto Mode Spanning ..................................... 4-19

4.4.2.2 Manual Mode Spanning................................. 4-20

4.5 The

4.6 The

4.6.1 Manual (Select/Define Range) Screen .................. 4-23

4.6.2 Auto Screen ........................................................... 4-24

4.6.3 Precautions............................................................ 4-25

4.7 The

4.8 Programming ................................................................. 4-27

4.8.1 The Set Range Screen .......................................... 4-27

4.8.2 The Curve Algorithm Screen ................................. 4-29

4.9 Special Function Setup.................................................. 4-32

4.9.1 Offset Output / Reverse Output ............................... 4-32

4.9.2 Polarity Reversal.................................................... 4-33

4.9.3 Gain Preset ............................................................ 4-34

Alarms
Range

Analyze

4.8.2.1 Checking the Linearization ............................ 4-29

4.8.2.2 Manual Mode Linearization ........................... 4-30

4.8.2.3 Auto Mode Linearization ................................ 4-31

4.9.1.1 Output Signal Reversal .................................. 4-32

4.9.1.2 Output Signal Offset ....................................... 4-33

Function...................................................... 4-21

Select Function ........................................... 4-23

Function .................................................... 4-26

5 Maintenance

5.0 Fuse Replacement......................................................... 5-1

5.1 Routine Maintenance ..................................................... 5-2

5.2 Filter............................................................................... 5-2

5.3 NDIR Analyzer Measurement Cell ................................. 5-3

5.4 System Self Diagnostic Test........................................... 5-3

5.5 Major Internal Components ............................................ 5-4

5.6 Troubleshooting ............................................................. 5-7

6.7 General .......................................................................... 5-7

5.8 Troubleshooting Chart ................................................... 5-8

A Appendix

Model 7300A Specifications .................................................. A-1

Recommended 2-Year Spare Parts List ................................. A-4

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

Exceptions, Gas Cnditions ..................................................... A-6

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Teledyne Analytical Instruments

Infrared Gas Analyzer Introduction 1

1.0 Introduction

1.1 Overview

The Teledyne Analytical Instruments Model 7300A Analyzer, is a

versatile microprocessor-based instrument.

The manual covers the Model 7300A General Purpose 19” Panel/Rack
mounted analyzer. Consisting of an Analysis section and Control Unit
section. The 7300A Analyzer is for indoor or protected use in General
Purpose environments only.

1.2 Typical Gas Applications

Chemical and petrochemical processes Gas Analysis

• Combustion and flue gas processes CO2 0-2% to 0-100%

• Pulp and paper CO 0-10% to 0-100%

• Vapor recovery systems CH4 0-10% to 0-100%

• Enhanced oil recovery C2 to C5 0-5% to 0-100%

Food, agriculture, medical Liquid Analysis

• Metals, ceramics and heat treating atmospheres Aromatics 0-5%
up to 0-100%

• Landfill gas power stations MTBE, ETBE,
TAME 0-20%

• Emissions testing (part of the mobile stations) Methanol, Ethanol
0-15%

• Carbon dioxide scrubber efficiency Isobutanes 0-75%

• CO / CO2 / C2H4 monitoring in oxyhydrochlorination Benzene 0-5%

process in EDC manufacturing

Water in solvents 0-5%

(For lower ranges and other liquids or gases, contact factory.)

Other ranges and gases possible with optical cell path/optical filter changes
(consult factory).

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1 Introduction Model 7300A

1.3 Main Features of the Analyzer

The Model 7300A Infrared Gas Analyzer is sophisticated yet simple to

use. The main features of the analyzer include:

• A easy-to-use front panel interface that includes a red 5-digit
LED display and a vacuum fluorescent display, driven by
microprocessor electronics, that continuously prompts and
informs the operator.

• High resolution, accurate readings of concentration from low
levels to 100%. Large, bright, meter readout.

• Versatile analysis over a wide range of applications.

• Microprocessor based electronics: 8-bit CMOS microprocessor

with 32 kB RAM and 128 kB ROM.

• Three user definable output ranges (from 0-2% through 0-100 %)
allow best match to users process and equipment.

• Calibration range for convenient zeroing or spanning.

• Auto Ranging allows analyzer to automatically select the proper

preset range for a given measurement. Manual override allows
the user to lock onto a specific range of interest.

• Two adjustable concentration alarms and a system failure alarm.

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

continuous power-supply monitoring.

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

• Analog outputs for concentration and range identification.
(0-1 V dc standard, and isolated 4–20 mA dc)

• Superior accuracy.

1.4 General

The Model 7300A is a non-dispersive infrared (NDIR) analyzer that
employs the basic principles of spectroscopic analysis to measure a specific
concentration of a gas in a multicomponent gas system. The concentration of
component of interest is determined by exposing a chamber (sample cell)
filled with a gas mixture to infrared radiant energy and measuring how much
of the specific (non-dispersive) infrared wavelength is absorbed by the gas

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Infrared Gas Analyzer Introduction 1

being measured. There is a direct correlation between absorption and the
concentration of the component of interest in the liquid mixture.

1.5 NDIR Analyzer

The Model 7300A contains an optical system consisting of an infrared
(IR) source, sample cell, and detectors. In front of the thermopile detectors
are four interference-type filters. These filters are designated the reference
and measuring filters. The sample flows continuously through the sample
cell, absorbing energy at various wavelengths throughout the IR spectrum.
The wavelengths and intensities of absorption peaks throughout the spectrum
are characteristic of the specific compounds that are present in the sample.

In any photometric analysis, there is always the analysis of the compo­nent of interest, and other components (background) which are not of mea­suring interest. Both the “component of interest” and the background compo­nent may have complex IR absorption spectra.

The quantitative measurement of a compound using the 7300A is based
on the Beer-Lambert Law, where the intensity of a beam of monochromatic
radiation transmitted through a sample decreases exponentially as the con­centration of the absorbing sample increases. The use of two filters and
detectors allows cancellation of energy changes due to turbidity, dirty sample
cell windows, aging of the source and sudden temperature changes.

The center pass band of the measuring filter is selected to transmit
energy in a narrow region (band pass) where the component of interest
absorbs strongly by comparison with the background components.The center
pass band of the reference filter is generally selected to transmit energy in a
band pass region where the background absorption of IR energy is equiva­lent to that seen by the measuring filter, and also to be in a region where the
component of interest has minimal absorption of energy. The IR radiation
passes through the sample and filters and strikes the detectors, which convert
the radiation into electrical signals, and are then amplified. Signal processing
involves comparing the measuring and reference signals in order to give a
readout representing the “component of interest” concentration in the sample.

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1 Introduction Model 7300A

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Infrared Gas Analyzer Installation 2

2.0 Installation

Installation of the Model 7300A Infrared Gas Analyzer includes:

1. Unpacking

2. Mounting

3. Gas connections

4. Electrical connections

5. Testing the system.

2.1 Unpacking the Analyzer/Inspection

The analyzer is shipped with all the materials you need to install and
prepare the system for operation. Carefully unpack the analyzer and inspect
it for damage. Immediately report any damage to the shipping agent.

2.2 Installing and Connecting the Analyzer

The 7300A analyzer is a general purpose analyzer and as such is
designed with (non-sealed) enclosures. It must be installed in an area where the
ambient temperature is not permitted to drop below 32°F nor rise above 100°F.
In areas outside these temperatures, auxillary heating/cooling must be supplied.
The 7300A enclosure is oil and dust resistant though designed to resist moisture,
must not be considered completely water-tight. Mounting to walls or racks must
be made securely. Avoid locations that are subject to extreme vibration and
sway.

Sufficient space must be provided around the analyzer to accommodate the
necessary electrical conduit and plumbing connections. The front panel must be
allowed to pull out for possible service access to all components of the enclosure.
Refer to the system/analyzer outline drawings for dimensions.

Regardless of configuration, the analyzer/system must be installed on a
level surface with sufficient space allocated on either side for personnel and test
equipment access. Subject to the foregoing, the Analyzer/System should be

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2 Installation Model 7300A

placed as close to the sample point as possible and bolted to its supporting
surface. When installed as a system with enclosure (non-panel or rack mounted)
a waterproof mastic should be liberally applied to the under surfaces of all
supporting legs of the cubicle system before placing it in position and bolting it
in place.

2.2.1 User Connections

All user connections are on the back of the equipment panel and
appear in the outline diagram in the back of the manual or addendum to the
manual.

2.2.2 Electrical Power Connections

The standard power requires a supply of 100-125VAC, single-phase
power. Power connections are made at the rear panel of the unit. Refer to the
input-output diagram for more information. The electrical power service must
include a high-quality ground wire. A high-quality ground wire is a wire that
has zero potential difference when measured to the power line neutral. If you
have the B option, you will require 220 or 240 VAC, 50/60 Hz power. Check
the analyzer input-output diagram, power schematic, outline, and wiring dia­grams for incoming power specifications and connecting points.

Warning: Primary power to the system should not be supplied until
all customer wiring is inspected properly by start-up personnel.

2.2.3 Calibration Gases

The system may require a supply of clean, oil and particulate free air for use
as zero gas.

For accurate calibration, the analyzer requires a blended gas mixture,
typically 80-90% of the full scale range. For examle: a 0-1% CO analyzer should
use a 0.8% to 0.9% CO in N2 bottled mixture. The gas blend should be a
working certified standard, analyzed by the gas supplier to at least 2% accuracy.

Do not restrict the bypass, sample or reference vents of the analyzer (and
sample system when provided). All lines must vent to a stable safe area-typically
1 ATM A +/- 0.005 pressure (0 psig +/- 0.07). Be sure to vent the analyzer exit
to atmospheric unless otherwise indicated by the system piping schematic. Refer
to the systsem outline, piping schematics for proper connections and flow paths
of the analysis system.

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Infrared Gas Analyzer Installation 2

2.2.4 Pipe Connections

Refer to Appendix Piping Drawings for information about pipe connec­tions. On special systems, consult the text in the manual that describes your
particular sample system in detail.

2.2.5 Sample Delivery System

The sample delivery system should be designed to operate reliably and
must be of large enough capacity to avoid flow stops. A pump is required only
if there is insufficient pressure to reliably supply the sample to the system
equipment panel. Do not complicate the delivery system by adding a pump
unless it is absolutely necessary. If a pump is required, select a type that can
handle the sample (corrosion), as well as meet the area classification and
Environmental conditions.

2.2.6 Venting the System

In gas analysis systems, the system vent manifold or bypass/sample vents
must terminate in a safe area as the sample may be poisonous, corrosive or
flammable.

2.3 Electrical Connections (Rear Panel)

Figure 3-3 shows the Model 7300A rear panel. There are connectors
for power, digital communications, and both digital and analog concentration
output.

For safe connections, no uninsulated wiring should be able to come in
contact with fingers, tools or clothing during normal operation.

CAUTION: Use Shielded Cables. Also, use plugs that provide

excellent EMI/RFI protection. The plug case must be
connected to the cable shield, and it must be tightly
fastened to the analyzer with its fastening screws.
Ultimately, it is the installer who ensures that the
connections provide adequate EMI/RFI shielding.

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2 Installation Model 7300A

2.3.1 Primary Input Power

The power cord receptacle and fuse block are located in the same

assembly. Insert the power cord into the power cord receptacle.

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

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

The standard power supply requires a 110 V ac, 50-60 Hz power source,

or 220 V ac, 50-60 Hz power (optional).

2.3.2 Fuse Installation

The fuse block, at the right of the power cord receptacle, accepts US or
European size fuses. A jumper replaces the fuse in whichever fuse receptacle
is not used.

2.3.3 50-Pin Equipment Interface Connector

Figure 2-1 shows the pin layout of the Equipment Interface connector.
The arrangement is shown as seen when the viewer faces the rear panel of
the analyzer. The pin numbers for each input/output function are given
where each function is described in the paragraphs below.

Figure 2-1: Equipment Interface Connector Pin Arrangement

2.3.3.1 Analog Outputs

There are four DC output signal pins—two pins per output. For polar­ity, see Table 3-1. The outputs are:

0–1 V dc % of Range: Voltage rises linearly with increasing concentration,

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

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

Range 3, 1 V = Cal Range.

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Infrared Gas Analyzer Installation 2

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

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

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

Range 3, 20 mA = Range 4.

Table 2-2: Analog Output Connections

Pin Function

3 + Range ID, 4-20 mA, floating
4 – Range ID, 4-20 mA, floating
5 + % Range, 4-20 mA, floating
6 – % Range, 4-20 mA, floating

8 + Range ID, 0-1 V dc
23 – Range ID, 0-1 V dc, negative ground
24 + % Range, 0-1 V dc

7 – % Range, 0-1 V dc, negative ground

Examples:

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

tration relative to the full scale of the range. To relate the signal output to the
actual concentration, it is necessary to know what range the instrument is
currently on, especially when the analyzer is in the autoranging mode.

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

Table 2-3: Analog Concentration Output—Example

Percent Voltage Signal Current Signal

CO Output (V dc) Output (mA dc)

0 0.0 4.0
1 0.1 5.6
2 0.2 7.2
3 0.3 8.8
4 0.4 10.4
5 0.5 12.0

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2 Installation Model 7300A

6 0.6 13.6
7 0.7 15.2
8 0.8 16.8
9 0.9 18.4

10 1.0 20.0

To provide an indication of the range, the Range ID analog outputs are
used. They generate a steady preset voltage (or current when using the
current outputs) to represent a particular range. Table 2-4 gives the range ID
output for each analysis range.

Table 2-4: Analog Range ID Output—Example

Range Voltage (V) Current (mA) Application

Range 1 0.25 8 90-100% CO/N
Range 2 0.50 12 95-100% CO/N
Range 3 0.75 16 0-100% CO/N
Range 4 (Cal) 1.00 20 98-100% CO2/N

2

2

2

2

2.3.3.2 Alarm Relays

The nine alarm-circuit connector pins connect to the internal alarm relay
contacts. Each set of three pins provides one set of Form C relay contacts.
Each relay has both normally open and normally closed contact connections.
The contact connections are shown in Table 2-4. They are capable of
switching up to 3 amperes at 250 V ac into a resistive load. The connectors
are:

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

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

• Can be configured as failsafe or nonfailsafe.

• Can be configured as latching or nonlatching.

• Can be configured out (defeated).

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

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

• Can be configured as failsafe or nonfailsafe.

• Can be configured as latching or nonlatching.

• Can be configured out (defeated).

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Infrared Gas Analyzer Installation 2

System Alarm: Actuates when DC power supplied to circuits is

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

(Reset by pressing
press

again and any other button EXCEPT

System

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

Table 2-5: Alarm Relay Contact Pins

Pin Contact

45 Threshold Alarm 1, normally closed contact
28 Threshold Alarm 1, moving contact
46 Threshold Alarm 1, normally open contact
42 Threshold Alarm 2, normally closed contact
44 Threshold Alarm 2, moving contact
43 Threshold Alarm 2, normally open contact
36 System Alarm, normally closed contact
20 System Alarm, moving contact
37 System Alarm, normally open contact

2.3.3.3 Digital Remote Cal Inputs

to resume.

button to remove power. Then

Accept 0 V (off) or 24 V dc (on) inputs for remote control of calibra-

tion. (See Remote Calibration Protocol below.) See Table 2-5 for pin
connections.

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

pins puts the analyzer into the
grounded at the source of the signal. A synchronous signal
must open and close the gas control valves appropriately.

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

pins puts the analyzer into the
be grounded at the source of the signal. A synchronous signal
must open and close the gas control valves appropriately.

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

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

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Zero

mode. Either side may be

Span

mode. Either side may

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2 Installation Model 7300A

Table 2-6: Remote Calibration Connections

Pin Function

9 + Remote Zero
11 – Remote Zero
10 + Remote Span
12 – Remote Span
40 Cal Contact
41 Cal Contact

Remote Calibration Protocol: To properly time the Digital Remote

Cal Inputs to the Model 7300A Analyzer, the customer's controller must
monitor the Cal Relay Contact.

When the contact is OPEN, the analyzer is analyzing, the Remote Cal

Inputs are being polled, and a zero or span command can be sent.

When the contact is CLOSED, the analyzer is already calibrating. It

will ignore your request to calibrate, and it will not remember that request.

Once a zero or span command is sent, and acknowledged (contact
closes), release it. If the command is continued until after the zero or span is
complete, the calibration will repeat and the Cal Relay Contact (CRC) will
close again.

For example:

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

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

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

4) When the CRC closes, remove the span command.

When CRC opens again, zero and span are done, and the sample is

being analyzed.

Note: The Remote Probe connector provides signals to operate the

zero and span gas valves synchronously. However, if you
have the –C Internal valve option, which includes zero and
span gas inputs, the 7300A automatically regulates the zero,
span and sample gas flow.

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Infrared Gas Analyzer Installation 2

2.3.3.4 Range ID Relays

Four dedicated Range ID relay contacts. For any single application they
are assigned to relays in ascending order. For example: if all ranges have the
same application, then the lowest range is assigned to the Range 1 ID relay,
and the highest range is assigned to the Range 3 ID relay. Range 4 is the Cal
Range ID relay. Table 2-7 lists the pin connections.

Table 2-7: Range ID Relay Connections

Pin Function

21 Range 1 ID Contact
38 Range 1 ID Contact
22 Range 2 ID Contact
39 Range 2 ID Contact
19 Range 3 ID Contact
18 Range 3 ID Contact
34 Range 4 ID Contact
35 Range 4 ID Contact

2.3.3.5 Network I/O

A serial digital input/output for local network protocol. At this printing,
this port is not yet functional. It is to be used in future options to the instru­ment. Pins 13 (+) and 29 (–).

2.3.3.6 Remote Valve Connector

The 7300A is a single-chassis instrument, which has no Remote Probe
Unit. Instead, the Remote Valve connector is used as another method for
controlling external sample/zero/span gas valves. See Figure 2-5.

Figure 2-5: Remote Probe Connector Pinouts

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The voltage from these outputs is nominally 0 V for the OFF and
15 V dc for the ON conditions. The maximum combined current that can be
pulled from these output lines is 100 mA. (If two lines are ON at the same
time, each must be limited to 50 mA, etc.) If more current and/or a different
voltage is required, use a relay, power amplifier, or other matching circuitry
to provide the actual driving current.

In addition, each individual line has a series FET with a nominal ON
resistance of 5 ohms (9 ohms worst case). This could limit the obtainable
voltage, depending on the load impedance applied. See Figure 2-8.

Figure 3-6: FET Series Resistance

2.3.4 RS-232 Port

The digital signal output is a standard RS-232 serial communications
port used to connect the analyzer to a computer, terminal, or other digital
device. It requires a standard 9-pin D connector.

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

• The concentration in ppm or percent

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

= Range 4)

• The span of the range (0-100 %, etc)

• Which alarms—if any—are disabled (AL–x DISABLED)

• Which alarms—if any—are tripped (AL–x ON).

Each status output is followed by a carriage return and line feed.

Input: The input functions using RS-232 that have been implemented
to date are described in Table 2-8.

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Infrared Gas Analyzer Installation 2

Table 2-8: Commands via RS-232 Input

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

APPLICATION (gas use) and ALGORITHM (linearization).

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

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

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

implementation. Table 2-9 lists certain RS-232 values that are required by
the Model 7300A implementation.

Table 2-9: Required RS-232 Options

Parameter Setting

Baud 2400

Byte 8 bits

Parity none

Stop Bits 1

Message Interval 2 seconds

System

functions:

2.4 Gas Requirements

Instrument Air is required for zeroing of the Infrared Analyzer. It must

be free of oil, particulates and water vapor (that will not condensate,
unfiltered plant air is not recommended). A supply pressure of 10-50psig
with a typical flow rate of 0.1 to 0.6 SCFH (50-250 cc/min) is needed.
Bottled gas is recommended (air or Nitrogen) if high quality air is not avail­able.

For accurate calibration, the analyzer requires blended gas mixtures

certified to +/- 2% accuracy.

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2.5 Testing the System

Before plugging the instrument into the power source:

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

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

• Check that sample pressure is controlled accuracately and is
maintained between 5 to 10 psig, according to the requirements
of your process.

NOTE: Special designed systems may require checks under vacuum

or high pressure (consult manual addendum).

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

operations:

1. Repeat the Self-Diagnostic Test, section 5.2

2.6 Calibration

2.6.1 Calibration Fluids

Zero fluids must be made by the chemistry lab or certified zero and span
gas bought from a gas supplier. The zero fluid must be the major component of
the sample, free from the component of interest.

Note: In Non-purity applications, the reference cell may be sealed

with clean air (consult factory).

The span fluid must be the major component of the sample mixed with
a small amount of the component of interest. The concentration must be 80 to
95% of the full scale range or the widest range of the instrument (if the instrument
provides more than one range).

2.6.2 Calibration

Refer to Section 4.4 of the manual to determine how to manipulate the
mode setting. The recommended calibration method is as follows:

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Method:

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Infrared Gas Analyzer Installation 2

1. Introduce zero fluid and set zero as referred in section 4.4.1

NOTE: When calibrating from 0% to an upper concentration gas, obtain
a zero gas (minus the analyte) that typically is as pure as the minimum resolution
needed to control to. This usually meets or exceeds the minimum full scale
accuracy of the measurement.

2. Introduce a span fluid and set the concentration of the span fluid.
Refer to the span procedure in section 4.4.2. (Note: The span gas should
typically be an 80% of full scale range gas similar to the 100% zero gas
background; i.e., 100% CO2 zero gas and a span gas of 98.4% CO2 in N2 for
a 98-100%CO2 purity application.

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