Rosemount CAT 7 Thermal Conductivity Transmitter-Rev B Owner's manual

Brand: Rosemount

Model: CAT 7 Thermal Conductivity Transmitter-Rev B

Type: Owner's manual

Instruction Manual

748451-B

March 2002

http://www.processanalytic.com

Model CAT7

Thermal Conductivity Analyzer

Emerson Process Management

Rosemount Analytical Inc.

Process Analytic Division

1201 N. Main St.

Orrville, OH 44667-0901

T (330) 682-9010

F (330) 684-4434

e-mail: [email protected]

http://www.processanalytic.com

ESSENTIAL INSTRUCTIONS

READ THIS PAGE BEFORE PROCEEDING!

Rosemount Analytical designs, manufactures and tests its products to meet many national and

international standards. Because these instruments are sophisticated technical products, you

MUST properly install, use, and maintain them to ensure they continue to operate within their

normal specifications. The following instructions MUST be adhered to and integrated into your

safety program when installing, using, and maintaining Rosemount Analytical products. Failure to

follow the proper instructions may cause any one of the following situations to occur: Loss of life;

personal injury; property damage; damage to this instrument; and warranty invalidation.

• Read all instructions prior to installing, operating, and servicing the product.

• If you do not understand any of the instructions, contact your Rosemount Analytical repre-

sentative for clarification.

• Follow all warnings, cautions, and instructions marked on and supplied with the product.

• Inform and educate your personnel in the proper installation, operation, and mainte-

nance of the product.

• Install your equipment as specified in the Installation Instructions of the appropriate In-

struction Manual and per applicable local and national codes. Connect all products to the

proper electrical and pressure sources.

• To ensure proper performance, use qualified personnel to install, operate, update, program,

and maintain the product.

• When replacement parts are required, ensure that qualified people use replacement parts

specified by Rosemount. Unauthorized parts and procedures can affect the product’s per-

formance, place the safe operation of your process at risk, and VOID YOUR WARRANTY.

Look-alike substitutions may result in fire, electrical hazards, or improper operation.

• Ensure that all equipment doors are closed and protective covers are in place, except

when maintenance is being performed by qualified persons, to prevent electrical shock

and personal injury.

The information contained in this document is subject to change without notice.

Teflon® is a registered trademark of E.I. duPont de Nemours and Co., Inc.

SNOOP® is a registered trademark of NUPRO Co.

Instruction Manual

748451-B

March 2002

Rosemount Analytical Inc. A Division of Emerson Process Management Contents i

Model CAT7

TABLE OF CONTENTS

PREFACE...........................................................................................................................................1

Definitions ...........................................................................................................................................1

safety Summary..................................................................................................................................2

General Precautions For Handling And Storing High Pressure Gas Cylinders .................................4

Documentation....................................................................................................................................5

Compliances .......................................................................................................................................5

1.0 DESCRIPTION AND SPECIFICATIONS..............................................................................1-1

1-1 Analyzer Module....................................................................................................................1-1

1-2 Thermal Conductivity Cell......................................................................................................1-1

1-3 Electronic Circuitry.................................................................................................................1-4

1-4 Gas Selector Panel................................................................................................................1-4

1-5 Specifications ........................................................................................................................1-5

2.0 INSTALLATION ....................................................................................................................2-1

2-1 Site Preparation.....................................................................................................................2-1

2-2 Customer Electrical Connections ..........................................................................................2-1

2-3 Flow Diagrams.......................................................................................................................2-1

2-4 Location and Mounting ..........................................................................................................2-1

a. Location...........................................................................................................................2-1

b. Mounting .........................................................................................................................2-1

2-5 Unpacking..............................................................................................................................2-3

2-6 Gas Requirements.................................................................................................................2-3

2-7 Calibration Gas Requirements ..............................................................................................2-3

a. Sample Gas Composition ...............................................................................................2-3

2-8 Suppressed-Zero Ranges .....................................................................................................2-3

2-9 Leak Check............................................................................................................................2-3

2-10 Gas Connections ...................................................................................................................2-4

2-11 Recorder Output Selection and Cable Connections .............................................................2-8

a. Standard (Non-linearized) Voltage Output......................................................................2-8

b. Linearized Voltage Output (Optional)..............................................................................2-8

c. Isolated 4 to 20 mA Current Output (Optional) ...............................................................2-8

2-12 Alarms (Optional)...................................................................................................................2-10

2-13 Linearized Voltage, Two Ranges (Optional)..........................................................................2-12

2-14 Linearized Voltage and Isolated 4 to 20 mA Current Output (Optional)................................2-12

2-15 Electrical Power Connections................................................................................................2-13

3.0 OPERATION .........................................................................................................................3-1

3-1 Analyzer Controls and Adjustments ......................................................................................3-1

3-2 Gas Selector Panel Controls .................................................................................................3-1

3-3 Startup Procedure .................................................................................................................3-1

3-4 Calibration..............................................................................................................................3-2

Instruction Manual

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March 2002

ii Contents Rosemount Analytical Inc. A Division of Emerson Process Management

Model CAT7

4.0 THEORY................................................................................................................................4-1

4-1 Thermal Conductivity Cell and Associated Bridge Adjustments ...........................................4-1

4-2 Master Board .........................................................................................................................4-1

a. Functions Associated with AR1 ......................................................................................4-1

b. Coarse zero and zero-suppression.................................................................................4-2

c. Functions Associated with AR2 ......................................................................................4-2

d. Meter ...............................................................................................................................4-2

e. Output Selection Switch S1 ............................................................................................4-2

4-3 Voltage Output Linearizer Board Option ...............................................................................4-2

4-4 Isolated 4 to 20 mA Current Output Board Option ................................................................4-4

4-5 Bridge Power Supply .............................................................................................................4-4

4-6 ±15 Volt Power Supply ..........................................................................................................4-4

4-7 Detector Blocks .....................................................................................................................4-4

4-8 Case Temperature Controller Assembly ...............................................................................4-4

4-9 Dual Alarms Option ...............................................................................................................4-5

5.0 SERVICE AND MAINTENANCE ..........................................................................................5-1

5-1 Thermal Conductivity Cell......................................................................................................5-1

5-2 Electronic Circuitry.................................................................................................................5-4

a. Amplifier Zero Adjustments.............................................................................................5-4

b. Bridge Balance and Range Sensitivity Adjustments.......................................................5-4

c. Case Temperature Controller .........................................................................................5-5

d. Dual Alarm Module (Optional).........................................................................................5-5

5-3 Suppressed Zero Adjustment................................................................................................5-5

6.0 REPLACEMENT PARTS ......................................................................................................6-1

6-1 Matrix .....................................................................................................................................6-1

6-2 Circuit Board Replacement Policy .........................................................................................6-3

6-3 Replacement Parts ................................................................................................................6-4

7.0 RETURN OF MATERIAL ......................................................................................................7-1

7-1 Return Of Material .................................................................................................................7-1

7-2 Customer Service ..................................................................................................................7-1

7-3 Training..................................................................................................................................7-1

Instruction Manual

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March 2002

Rosemount Analytical Inc. A Division of Emerson Process Management Contents iii

Model CAT7

LIST OF ILLUSTRATIONS

Figure 1-1. CAT7 Controls, Adjustments, Ports .......................................................................... 1-2

Figure 1-2. Fuse Location............................................................................................................ 1-2

Figure 1-3. CAT7 – Exploded View ............................................................................................. 1-3

Figure 1-4. Typical Gas Selector Panel....................................................................................... 1-4

Figure 2-1. Gas Selector Panel for Thermal Conductivity Cell with Sealed-In Reference Gas .. 2-1

Figure 2-2. Gas Selector Panel for Thermal Conductivity Cell Using Flowing Reference Gas .. 2-2

Figure 2-3. Gas Connections – Bottom View of Analyzer ........................................................... 2-4

Figure 2-4. Connection of Analyzer Using Sealed-In Reference Gas to Associated Gas .......... 2-5

Figure 2-5. Connection of Analyzer Using Flowing Reference Gas to Associated Gas Selector

Panel...................................................................................................................... 2-6

Figure 2-6. Intrinsic Safety Box ................................................................................................... 2-7

Figure 2-7. Intrinsic Safety Box Interconnect .............................................................................. 2-7

Figure 2-8. Master Board............................................................................................................. 2-9

Figure 2-9. Alarm Adjustments ..................................................................................................2-10

Figure 2-10. Typical Alarm Settings .......................................................................................... 2-11

Figure 2-11. Case Heater Temperature Control Board............................................................. 2-13

Figure 4-1. Thermal Conductivity Cell ......................................................................................... 4-3

LIST OF TABLES

Table 1-1. Available Gas Selector Panels................................................................................... 1-5

Table 4-1. Range Switch Connections ........................................................................................ 4-2

DRAWINGS

(LOCATED IN REAR OF MANUAL)

613561 Schematic Diagram, Bridge Power Supply - Regulated 5 to 15V

619710 Schematic Diagram, 15V Power Supply

624003 Schematic Diagram, Temperature Controller

652813 Schematic Diagram, Isolated Current Output

652863 Schematic Diagram, Linearizer Board

654616 Schematic Diagram, Master Board

661200 Assembly Instructions, CAT7

661203 Assembly, Chassis

661318 Installation Drawing, CAT7

661540 Assembly, Temperature Control

661541 Assembly, Meter

661562 Wiring Diagram, CAT7

Instruction Manual

748451-B

March 2002

iv Contents Rosemount Analytical Inc. A Division of Emerson Process Management

Model CAT7

Instruction Manual

748451-B

March 2002

Rosemount Analytical Inc. A Division of Emerson Process Management Preface P-1

Model CAT7

PREFACE

The purpose of this manual is to provide information concerning the components,

functions, installation and maintenance of the CAT7 Thermal Conductivity Analyzer.

Some sections may describe equipment not used in your configuration. The user should

become thoroughly familiar with the operation of this module before operating it. Read

this instruction manual completely.

DEFINITIONS

The following definitions apply to DANGERS, WARNINGS, CAUTIONS and NOTES found throughout

this publication.

DANGER .

Highlights the presence of a hazard which will cause severe personal injury, death, or substantial

property damage if the warning is ignored.

WARNING .

Highlights an operation or maintenance procedure, practice, condition, statement, etc. If not

strictly observed, could result in injury, death, or long-term health hazards of personnel.

CAUTION.

Highlights an operation or maintenance procedure, practice, condition, statement, etc. If not

strictly observed, could result in damage to or destruction of equipment, or loss of effectiveness.

NOTE

Highlights an essential operating procedure,

condition or statement.

Instruction Manual

748451-B

March 2002

P-2 Preface Rosemount Analytical Inc. A Division of Emerson Process Management

Model CAT7

SAFETY SUMMARY

To avoid explosion, loss of life, personal injury and damage to this equipment and on-site property, all per-

sonnel authorized to install, operate and service the Model CAT7 Thermal Conductivity Analyzer should be

thoroughly familiar with and strictly follow the instructions in this manual. Save these instructions.

If this equipment is used in a manner not specified in these instructions, protective systems may be

impaired.

AUTHORIZED PERSONNEL

To avoid explosion, loss of life, personal injury and damage to this equipment and on-site

property, all personnel authorized to install, operate and service the this equipment should be

thoroughly familiar with and strictly follow the instructions in this manual. SAVE THESE IN-

STRUCTIONS.

DANGER.

ELECTRICAL SHOCK HAZARD

Do not operate without doors and covers secure. Servicing requires access to live parts which can

cause death or serious injury. Refer servicing to qualified personnel.

For safety and proper performance this instrument must be connected to a properly grounded

three-wire source of power.

NOTE

Before supplying electrical power to the analyzer, remove power to the bridge by disconnecting the

red lead from the bridge to TB1-1 or TB1-2 (depending on the bridge polarity). See drawing 661562.

To safeguard against filament damage, this lead should remain disconnected until proper gas flow

has been established.

DANGER

EXPLOSION HAZARD

Do not operate the Model CAT7 Explosion-Proof Analyzer without the lens cover in place and com-

pletely secured, unless location have been determined to be non-hazardous.

Instruction Manual

748451-B

March 2002

Rosemount Analytical Inc. A Division of Emerson Process Management Preface P-3

Model CAT7

DANGER

EXPLOSION HAZARD

This analyzer is of a type capable of analysis of sample gases which may be flammable. If used for

analysis of such gases, the instruments explosion-proof enclosure must be suitable for the gas.

If explosive gases are introduced into this analyzer, the sample containment system must be care-

fully leak-checked upon installation and before initial startup, during routine maintenance and any

time the integrity of the sample containment system is broken, to ensure the system is in leak-proof

condition. Leak-check instructions are provided in Section 2-9.

Internal leaks resulting from failure to observe these precautions could result in an explosion

causing death, personal injury or property damage.

WARNING .

PARTS INTEGRITY

Tampering or unauthorized substitution of components may adversely affect safety of this product.

Use only factory documented components for repair.

WARNING.

HIGH PRESSURE GAS CYLINDERS

This instrument requires periodic calibration with a known standard gas. See also General Precau-

tions for Handling and Storing High Pressure Gas Cylinders, page P-4.

Instruction Manual

748451-B

March 2002

P-4 Preface Rosemount Analytical Inc. A Division of Emerson Process Management

Model CAT7

GENERAL PRECAUTIONS FOR HANDLING AND STORING HIGH

PRESSURE GAS CYLINDERS

Edited from selected paragraphs of the Compressed Gas Association's "Handbook of Compressed

Gases" published in 1981

Compressed Gas Association

1235 Jefferson Davis Highway

Arlington, Virginia 22202

Used by Permission

1. Never drop cylinders or permit them to strike each other violently.

2. Cylinders may be stored in the open, but in such cases, should be protected against extremes of weather

and, to prevent rusting, from the dampness of the ground. Cylinders should be stored in the shade when lo-

cated in areas where extreme temperatures are prevalent.

3. The valve protection cap should be left on each cylinder until it has been secured against a wall or bench, or

placed in a cylinder stand, and is ready to be used.

4. Avoid dragging, rolling, or sliding cylinders, even for a short distance; they should be moved by using a suit-

able hand-truck.

5. Never tamper with safety devices in valves or cylinders.

6. Do not store full and empty cylinders together. Serious suckback can occur when an empty cylinder is at-

tached to a pressurized system.

7. No part of cylinder should be subjected to a temperature higher than 125

F (52

C). A flame should never be

permitted to come in contact with any part of a compressed gas cylinder.

8. Do not place cylinders where they may become part of an electric circuit. When electric arc welding, precau-

tions must be taken to prevent striking an arc against the cylinder.

Instruction Manual

748451-B

March 2002

Rosemount Analytical Inc. A Division of Emerson Process Management Preface P-5

Model CAT7

DOCUMENTATION

The following CAT7 Thermal Conductivity Analyzer instruction materials are available. Contact Customer

Service or the local representative to order.

748451 Instruction Manual (this document)

COMPLIANCES

This product may carry approvals from several certifying agencies. The certification marks appear on the

product name-rating plate.

Area Classifications:

USA

Class I Zone 1

AEx d e m IIB + H

Canada

Ex d e m IIB + H

European Union

ATEX, Category 2, Zone 1, IIB + H

USA/Canada

Certified by Canadian Standards Association, an OSHA Nationally Recog-

nized Testing Laboratory (NRTL) for USA and Canada.

European Union

Conforms with the provisions of the EMC Directive 89/336/EEC, Low Volt-

age Directive 73/23/EEC, Potentially Explosive Atmospheres Directive

94/9/EC, including amendments by the CE marking Directive 93/68/EEC.

EC type Examination Certificate, LCIE 00 ATEX 6009 X.

Rosemount Analytical has satisfied all obligations from the European Leg-

islation to harmonize the product requirements in Europe.

Australia/New Zealand

Conforms with Electromagnetic Compatibility – Generic Emission standard

and AS/NZS 4251.1 – 1994 Part 1 – Residential, commercial, and light in-

dustrial.

Complies with the NAMUR RECOMMENDATION, Electromagnetic Com-

patibility (EMC) issue 1998.

N96

0081

II 2 G

EEx d e m II B (+H

) T4

LCIE 00 ATEX 6009 X

CUS

NAMUR

Instruction Manual

748451-B

March 2002

P-6 Preface Rosemount Analytical Inc. A Division of Emerson Process Management

Model CAT7

Instruction Manual

748451-B

March 2002

Rosemount Analytical Inc. A Division of Emerson Process Management Description and Specifications 1-1

Model CAT7

SECTION 1

DESCRIPTION AND SPECIFICATIONS

The Model CAT7 Thermal Conductivity Analyzer is

designed to continuously measure the concentration of

a single component of interest in a flowing gas mix-

ture. The measurement is based on the different

thermal conductivity's of the individual components of

the sample stream. The method is especially well

suited to analysis of two-component sample streams.

However, analysis of multi-component streams is pos-

sible if the various components of the background gas

occur in relatively constant ratio, or have similar ther-

mal conductivity's.

Each Model CAT7 Analyzer is factory-assembled, as

ordered, for determination of a specified component,

with specified range of concentration, contained in a

background component or background mixture of

known composition. Typical examples include: 0 to

100 % hydrogen in nitrogen; 20 to 50 % helium in

methane; and 0% to 3% carbon dioxide in air. If so

ordered, the instrument is provided with two or three

ranges; selectable via a side-panel switch. Informa-

tion specific to the individual instrument is provided in

the data sheet inserted in the back of this instruction

manual.

A Model CAT7 Analyzer consists of an analyzer mod-

ule, Section 1-1, and, if ordered, an accessory gas

selector panel, Section 1-4.

1-1 ANALYZER MODULE

The analyzer module is supplied in an explo-

sion-proof enclosure suitable for installation in

hazardous locations classified as Zone 1,

Groups II B (+H

), T4, Category 2, Zone 1,

Group II B (+H

), T4.

1-2 THERMAL CONDUCTIVITY CELL

The thermal conductivity cell is a metal

block with separate passages for the sam-

ple and reference gases. In all applications,

the sample passage receives a continuous

flow of sample gas. Depending on the ap-

plication, the reference passage may re-

ceive a continuous flow of reference gas, or

may have the reference gas sealed within.

The sample passage contains a pair of

temperature-sensitive resistive filaments.

The reference passage contains a similar

pair. Electrically, the filaments are con-

nected as legs of a Wheatstone bridge. An

internal voltage-regulated power supply is

connected via a 20-ohm dropping resistor,

to the bridge.

With the power supply output adjusted to

provide an appropriate voltage across the

bridge, an electric current flows through the

filaments, heating them and thus increasing

their electrical resistance. The

heat-dissipation rate for each filament de-

pends on the thermal conductivity of the

surrounding gas.

Initially, with suitable downscale calibration

gas flowing through the sample passage

(and also through the reference passage if

of the flow-through configuration), the

bridge is balanced. Thereafter, any change

in the relative proportions of the compo-

nents passing through the sample passage

changes the thermal conductivity of the gas

mixture, causing a temperature differential

between sample and reference filaments.

The resultant change in filament resistance

unbalances the bridge, applying a signal to

the electronic circuitry (Section 1-3).

Instruction Manual

748451-B

March 2002

1-2 Description and Specifications Rosemount Analytical Inc. A Division of Emerson Process Management

Model CAT7

Figure 1-1. CAT7 Controls, Adjustments, Ports

Figure 1-2. Fuse Location

Fuse

Zero

ust

Span

Adjust

Signal Output,

Alarm Ports

Range Select

Alarm

AC Power

Port

Instruction Manual

748451-B

March 2002

Rosemount Analytical Inc. A Division of Emerson Process Management Description and Specifications 1-3

Model CAT7

Figure 1-3. CAT7 – Exploded View

Chassis Assembly

Meter Assembly

Alarm Module

Instruction Manual

748451-B

March 2002

1-4 Description and Specifications Rosemount Analytical Inc. A Division of Emerson Process Management

Model CAT7

1-3 ELECTRONIC CIRCUITRY

The analyzer module contains solid-state cir-

cuitry that conditions the bridge-imbalance

signal as required to provide readout on the

meter. In addition, a field-selectable output

for a voltage-type recorder is provided as

standard. A field-selectable output of 4 to 20

mA for a current-actuated recorder or other

device is obtainable through use of an op-

tional plug-in circuit board. A calibration

curve can be used to convert meter or re-

corder readings into concentration values.

Typical calibration curves are supplied for

standard ranges. Calibration curves for spe-

cial ranges are available as options.

To avoid use of a calibration curve in an ap-

plication where it would otherwise be required,

the analyzer may be equipped with an op-

tional linearizer board. If so, the linearizer is

factory set for a given range only, and is not

usable on another range. Note that a line-

arizer is usable only if non-linearity at mid-

scale does not exceed approximately 20% of

fullscale.

1-4 GAS SELECTOR PANEL

If so ordered, the analyzer module is provided

with an appropriate gas selector panel, Figure

1-4. The gas selector panel permits selection,

flow adjustment, and flow measurement for

the various gases: sample; flowing reference

gas, if used; and downscale and upscale cali-

bration gases. Proper choice of a gas selec-

tor panel depends on:

1. Configuration of the thermal conductivity

cell, i.e., flowing or sealed-in reference

gas.

2. Composition of the sample stream. For

non-corrosive streams, the gas selector

panel is assembled with brass compo-

nents. For corrosive streams, stainless

steel is used.

Figure 1-4. Typical Gas Selector Panel

Provided only if thermal conductivity cell uses flowing reference gas.

DOWNSCALE

CAL GAS

UPSCALE

CAL GAS

SAMPLE

REFERENCE

SAMPLE

REF

Reference Gas

Flow Meter

Sample/Calibration

Gas Flow Meter

Downscale Calibration

Gas Needle Valve

Upscale Calibration Gas

Needle Valve

Sample Gas

Needle Valve

Reference Gas

Needle Valve

Instruction Manual

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March 2002

Rosemount Analytical Inc. A Division of Emerson Process Management Description and Specifications 1-5

Model CAT7

DESCRIPTION PART NUMBER

Brass and Copper construction for use with sealed reference 113357

Stainless steel construction for use with sealed reference 113920

Brass and Copper construction for use with flowing reference 117195

Stainless steel construction for use with flowing reference 118210

Table 1-1. Available Gas Selector Panels

1-5 SPECIFICATIONS

Reproducibility............................... ±0.5% of fullscale

Zero Drift

...................................... ±1% of fullscale per 24 hours

Span Drift

..................................... ±1% of fullscale per 24 hours

Noise ............................................. Less than ±0.5% of fullscale

Cell Response Time

..................... 30 seconds for 95% response, with sample flow of 250 cc/min.

Sample Flow.................................. Nominal, 50 to 350 cc/min; recommended, 250 cc/min.

Calibration Gas Flow ..................... Nominal, 50 to 350 cc/min; recommended, 250 cc/min.

Reference Gas Flow (If Req’d)...... 5 to 50 cc/min.

Supply Pressure ............................ 10 to 50 psig (69 to 345 kPa)

Meter ............................................. Indicating analog meter is standard.

Operating Ranges ......................... Various zero-based and zero-suppressed ranges, from 0% to

100%, are available. Single range is standard; switch-selectable

dual or triple range is optional.

Ambient Temperature Range........ 32°F to 100°F (0°C to 38°C). Case Temperature controlled at

117°F (47°C).

Output Voltage

Non-Linearized (Standard) .... Switch selectable: 0 to 10 mV, 0 to 100 mV, 0 to 1V or 0 to 5V DC

Linearized (Option) ................ Switch selectable: 0 to 10 mV, 0 to 100 mV, 0 to 1V or 0 to 5V DC

Isolated Current Output (Option)... 4 to 20 mA, maximum load 1500 ohms

Dual Alarms (Option)..................... Relay contact rating: 1.0 A, 120V AC; 5.0 A, 120V DC, resistive

loads

Cell Materials (Standard Cell) ....... 316 stainless steel block with tungsten or Hitempco filaments. Cor-

rosion-resistant filaments available on order

Power Requirements..................... 115/230 VAC ±10%, 50/60 Hz, 250 Watts

Enclosure....................................... Zone 1, Groups II B (+H

), T4, Category 2, Zone 1, Group II B

(+H

), T4

Zero and Span drift specifications based on ambient temperature shifts of less than 18 Fahrenheit degrees (10 Celsius de-

grees) at a maximum rate of 18 Fahrenheit degrees (11 Celsius degrees) per hour.

Cell response time is less than 45 seconds for 95% response, with sample flow rate of 250 cc/min, for the following gas

combinations: Argon and air, nitrogen, or oxygen; carbon dioxide and argon, nitrogen, or oxygen; helium and methane; hy-

drogen and methane.

Instruction Manual

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March 2002

1-6 Description and Specifications Rosemount Analytical Inc. A Division of Emerson Process Management

Model CAT7

Instruction Manual

748451-B

March 2002

Rosemount Analytical Inc. A Division of Emerson Process Management Installation 2-1

Model CAT7

SECTION 2

INSTALLATION

2-1 SITE PREPARATION

This section provides information that may be

required prior to installation.

For outline and mounting dimensions of the

analyzer drawing 661318. For outline and

mounting dimensions of the gas selector

panel, see Figure 2-1, and Figure 2-2.

2-2 CUSTOMER ELECTRICAL CONNECTIONS

Customer electrical connections are shown in

Figure 2-7 and drawing 661562.

2-3 FLOW DIAGRAMS

For gas connections, refer to appropriate flow

diagram:

• Analyzer using sealed reference

gas, Figure 2-4.

• Analyzer using flowing reference

gas, Figure 2-5.

2-4 LOCATION AND MOUNTING

a. Location

Proper location for the analyzer depends

on two basic considerations:

•

Accessibility to the sampling point

•

Protection of the instrument

Ideally, the analyzer should be located as

close to the sampling point as possible.

Short sample lines reduce time lag in

readings. In practice, however, protection

of the instrument sometimes calls for

more remote placement.

The analyzer should be mounted in a

clean, dry atmosphere. Ambient tem-

perature should be within the range of

F to 100 F (0

C to 38

C).

b. Mounting

The analyzer is designed for wall mount-

ing. Refer to drawing 661318.

Figure 2-1. Gas Selector Panel for Thermal Conductivity Cell with Sealed-In Reference Gas

ZERO SPAN

SAMPLE

10.25

[260]

8.25

[210]

Mounting Holes (4)

NO. 8 Flat Head Screw

Sample In

To Analyzer

Zero Gas In

Span Gas In

Instruction Manual

748451-B

March 2002

2-2 Installation Rosemount Analytical Inc. A Division of Emerson Process Management

Model CAT7

Figure 2-2. Gas Selector Panel for Thermal Conductivity Cell Using Flowing Reference Gas

DOWNSCALE

CALIBRATION GAS

SAMPLE

UPSCALE

CALIBRATION GAS

REF

REF SAMPLE

Upscale Cali-

bration Gas

To Analyzer

Ref Gas Inlet

Downscale Cali-

bration Gas

Sample Gas

1.25

[32]

Ref Gas

To Analyzer

Sample Inlet

3.25

[83]

.12

[3]

Mounting Holes (4)

NO. 8 Flat Head Screw

10.25

[260]

8.25

[210]

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Rosemount CAT 7 Thermal Conductivity Transmitter-Rev B Owner's manual

Rosemount CAT 7 Thermal Conductivity Transmitter-Rev B Owner's manual

Rosemount CAT 7 Thermal Conductivity Transmitter-Rev B Owner's manual

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