Rosemount 951A NO/NOx Analyzer-Rev Z Owner's manual

Brand: Rosemount

Model: 951A NO/NOx Analyzer-Rev Z

Category: Oxygen Equipment

Type: Owner's manual

Instruction Manual

556383-Z

March 2002

http://www.processanalytic.com

Model 951A

NO/NOx 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.

Alconox ® is a registered trademark of Alconox, Inc.

Instruction Manual

556383-Z

March 2002

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

Model 951A

TABLE OF CONTENTS

PREFACE...........................................................................................................................................P-1

Definitions ...........................................................................................................................................P-1

Intended Use Statement.....................................................................................................................P-2

Safety Summary .................................................................................................................................P-2

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

Documentation....................................................................................................................................P-5

Compliances .......................................................................................................................................P-5

1-0 DESCRIPTION AND SPECIFICATIONS..............................................................................1-1

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

1-2 Options ..................................................................................................................................1-2

a. Range I.D. .......................................................................................................................1-2

b. Remote Range Change ..................................................................................................1-2

c. Range I.D. and Remote Range Change.........................................................................1-2

d. Sample Pump..................................................................................................................1-2

1-3 Specifications ........................................................................................................................1-3

2-0 INSTALLATION ....................................................................................................................2-1

2-1 Facility Preparation................................................................................................................2-1

a. Outline and Mounting Dimensions ..................................................................................2-1

b. Location...........................................................................................................................2-1

c. Power Requirements ......................................................................................................2-1

2-2 Unpacking..............................................................................................................................2-1

2-3 Gas Requirements.................................................................................................................2-1

a. Air Or Oxygen .................................................................................................................2-1

b. Span Gas ........................................................................................................................2-2

2-4 Sample Requirements ...........................................................................................................2-2

2-5 Gas Connections ...................................................................................................................2-2

2-6 Electrical Connections ...........................................................................................................2-6

a. Recorder Output..............................................................................................................2-6

b. Thermocouple Connections for Measuring Temperature of NO

to NO Converter ........2-6

c. Remote Range Change ..................................................................................................2-6

d. Connections of the Range I. D. Kit..................................................................................2-6

e. Power Connections.........................................................................................................2-6

3-0 STARTUP AND OPERATION ..............................................................................................3-1

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

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

3-3 Measuring Efficiency Of No

To No Converter And Adjusting Temperature Setpoint ..........3-4

a. Test Setup for Measurement of Conversion Efficiency...................................................3-4

b. Test Procedure................................................................................................................3-4

c. Subnormal Conversion Efficiency...................................................................................3-8

d. Replacement of Converter ..............................................................................................3-8

e. Capillaries .......................................................................................................................3-8

f. TEA Scrubber..................................................................................................................3-9

3-4 Routine Operation .................................................................................................................3-9

3-5 Recommended Calibration Frequency..................................................................................3-9

Instruction Manual

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March 2002

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

Model 951A

4-0 THEORY................................................................................................................................4-1

4-1 Principles Of Operation .........................................................................................................4-1

a. Nitric Oxide Determination By Chemiluminescense Method ..........................................4-1

b. NO

Determination..........................................................................................................4-1

c. Ozone Generation...........................................................................................................4-1

4-2 Analyzer Flow System ...........................................................................................................4-1

a. Flow Of Sample Or Standard Gas To Reaction Chamber..............................................4-1

b. Flow of Air or Oxygen .....................................................................................................4-3

c. Flow System Operating Modes.......................................................................................4-3

d. Converter Bleed Flow .....................................................................................................4-4

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

a. Amplifier Board and Associated Circuitry .......................................................................4-5

b. Valve Control Board, Front Panel Mode Switch and Associated Circuitry .....................4-6

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

d. High Voltage Power Supply ............................................................................................4-7

e. Converter Temperature Control Board and Associated Elements .................................4-7

f. Fan Control Circuit ..........................................................................................................4-8

g. Remote Operation Option ...............................................................................................4-8

h. Range I.D. Option ...........................................................................................................4-8

5-0 ROUTINE SERVICING..........................................................................................................5-1

5-1 System Checks And Adjustments .........................................................................................5-1

a. Meter Mechanical Zero ...................................................................................................5-1

b. Amplifier Zero Adjustments.............................................................................................5-1

c. Inter-Range Attenuation Correlation adjustments...........................................................5-1

d. Meter Fullscale Span Adjustment ...................................................................................5-2

e. Overall Sensitivity............................................................................................................5-3

f. Ozone Output..................................................................................................................5-3

g. Background Current........................................................................................................5-3

h. NO

to NO Converter Temperature Adjustment .............................................................5-4

i. Flow Balance...................................................................................................................5-4

5-2 Servicing Flow System ..........................................................................................................5-5

a. Sample Capillary .............................................................................................................5-5

b. Ozone Restrictor and Capillary .......................................................................................5-6

5-3 NO

To NO Converter............................................................................................................5-7

a. Replacing ........................................................................................................................5-7

5-4 Photomultiplier/Reaction Chamber........................................................................................5-8

a. Cleaning Reaction Chamber...........................................................................................5-8

b. Photomultiplier Tube and Housing..................................................................................5-10

5-5 Servicing Electronic Circuitry.................................................................................................5-11

6-0 REPLACEMENT PARTS ......................................................................................................6-1

6-1 Circuit Board Replacement Policy .........................................................................................6-1

6-2 Matrix .....................................................................................................................................6-1

6-3 Replacement Parts ................................................................................................................6-2

a. Pneumatics .....................................................................................................................6-7

b. Converter Assembly........................................................................................................6-8

c. Low Tempco Option ........................................................................................................6-10

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 951A

LIST OF ILLUSTRATIONS

Figure 1-1. Model 951A NO/NO

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

Figure 2-1. Model 951A Outline and Mounting Dimensions .................................................... 2-3

Figure 2-2. Front Panel Indicators and Controls ...................................................................... 2-4

Figure 2-3. Controls and Adjustments Located Behind Swing Out Front Panel...................... 2-4

Figure 2-4. Rear Panel............................................................................................................. 2-4

Figure 2-5. Remote Range Kit Installed................................................................................... 2-7

Figure 2-6. Typical Interconnection of Remote Range Kit ....................................................... 2-7

Figure 3-1. Amplifier Board Adjustments ................................................................................. 3-3

Figure 3-2. Measuring Efficiency of NO

to NO Converter ...................................................... 3-7

Figure 3-3. Conversion Efficiency as a Function of Converter Temperature........................... 3-8

Figure 4-1. Schematic Flow Diagram of Model 951A .............................................................. 4-2

Figure 4-2. Functional Schematic Diagram of Electronic Signal Circuitry ............................... 4-5

Figure 5-1. Amplifier Board ......................................................................................................5-2

Figure 5-2. NO

to NO Converter Assembly ............................................................................ 5-7

Figure 5-3. Reaction Chamber/Photomultiplier Assembly ....................................................... 5-9

Figure 5-4. Reaction Chamber Assembly and Phototube Housing ......................................... 5-9

Figure 5-5. Terminal Chassis Assembly Wiring Diagram ...................................................... 5-12

Figure 6-1. Model 951A – Exploded View................................................................................ 6-3

Figure 6-2. Model 951A – Exploded View (continued)............................................................. 6-4

Figure 6-3. Model 951A – Exploded View (continued)............................................................. 6-5

Figure 6-4. Electronics ............................................................................................................. 6-6

Figure 6-5. Front Panel Pneumatic Components..................................................................... 6-7

Figure 6-6. Converter Components.......................................................................................... 6-8

Figure 6-7. Ozone Generator Components.............................................................................. 6-9

Figure 6-8. Tempco Retrofit Component Location................................................................. 6-10

LIST OF TABLES

Table 2-1. Model 951A Controls and Adjustments ................................................................. 2-5

Table 3-1. Proper Gas Supply Pressures for Various Levels of Sample NO

........................ 3-2

Instruction Manual

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March 2002

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

Model 951A

DRAWINGS

(Located In Rear Of Manual)

619604 Schematic Diagram, Computer Interface

619710 Schematic Diagram, ±15V Power Supply

641871 Schematic Diagram, Temp Control

649819 Schematic Diagram, Amplifier Board

649822 Diagram, Tubing - Model 95A

649834 Schematic Diagram, 951A NO/NOx Analyzer

649835 Pictorial Wiring Diagram, Model 951A NO/NOx Analyzer

649958 Flow Diagram, Model 951A

652423 Schematic Diagram, Power Supply

652834 Schematic Diagram, Power Supply - Thermocooler

652838 Pictorial Wiring Diagram, Low Tempco Option

654348 Schematic Diagram, Hi Voltage Board Assembly

656313 Schematic Diagram, Valve Control Board

780350 Schematic Diagram, 4-20mA 0-5V Option

780726 Wiring Diagram, 4-20mA 0-5V Option

780727 Installation Drawing, Model 951A w/4-20mA 0-5V Option

780809 Wiring Diagram, 4-20mA 0-5V Option and Low Tempco

Instruction Manual

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March 2002

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

Model 951A

PREFACE

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

stallation and maintenance of the Model 951A .

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

thoroughly familiar with the operation of this analyzer 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

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March 2002

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

Model 951A

INTENDED USE STATEMENT

The Model 951A NO/NOx Analyzer is intended for use as an industrial process measurement device

only. It is not intended for use in medical, diagnostic, or life support applications, and no inde-

pendent agency certifications or approvals are to be implied as covering such applications.

SAFETY SUMMARY

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,

do not operate or service this instrument before reading and understanding this instruction manual

and receiving appropriate training. Save these instructions.

DANGER.

ELECTRICAL SHOCK HAZARD

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

can cause death or serious injury.

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

three-wire source of power.

DANGER.

ULTRA VIOLET LIGHT HAZARD

UV light from the ozone generator can cause permanent eye damage. DO NOT LOOK DIRECTLY AT

THE UV SOURCE IN THE OZONE GENERATOR. Use of UV filtering glasses is recommended.

Instruction Manual

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March 2002

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

Model 951A

DANGER.

OZONE HAZARD

This instrument generates ozone while operating. Ozone is toxic by inhalation and is a strong irri-

tant to the throat and lungs. Ozone is also a strong oxidizing agent. Its presence is detected by a

characteristic pungent odor.

The instrument EXHAUST outlet contains ozone and nitrogen dioxide which is toxic by inhalation.

The BYPASS outlet contains various oxides of nitrogen, and if the sample source is from the ex-

haust of an internal combustion engine, it may contain unburned hydrocarbons and carbon mon-

oxide which is highly toxic and, depending on duration of exposure, can cause headache, nausea,

loss of consciousness and death.

Avoid any inhalation of the internally generated ozone, sample, EXHAUST and BYPASS discharge.

Keep all tubing fittings checked for tightness to avoid internal leaks.

Connect rear panel EXHAUST and BYPASS outlets to outside vent via separate lines 1/4 inch

(6.3mm) or larger. Use only Teflon or stainless steel tubing.

WARNING.

PARTS INTEGRITY

Tampering with or unauthorized substitution of components may adversely affect the safety of this

instrument. Use only factory approved components for repair.

CAUTION

AIR FLOW

Do not operate instrument without air flow to the ozonator; plugging of the filter will result.

CAUTION.

PRESSURIZED GAS

This unit requires periodic calibration with a known standard gas. It also may utilizes a pressur-

ized carrier gas, such as helium, hydrogen, or nitrogen. See General Precautions for Handling and

Storing High Pressure Gas Cylinders, page P-4.

Instruction Manual

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March 2002

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

Model 951A

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 located 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

suitable 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

attached 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,

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

Instruction Manual

556383-Z

March 2002

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

Model 951A

DOCUMENTATION

The following Model 951A NO/NOx Analyzer instruction materials are available. Contact Customer Serv-

ice Center or the local representative to order.

556383 Instruction Manual (this document)

COMPLIANCES

This product may carry approvals from several certifying agencies, for use in non-hazardous, indoor loca-

tions.

97-C218

Instruction Manual

556383-Z

March 2002

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

Model 951A

Instruction Manual

556383-Z

March 2002

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

Model 951A

SECTION 1

DESCRIPTION AND SPECIFICATIONS

1-1 OVERVIEW

The Model 951A NO/NO

Analyzer continu-

ously analyzes a flowing gas sample per-

forming one of two switch selectable

determinations:

1. Nitric oxide (NO); or

2. Combined nitric oxide (NO) and nitrogen

dioxide (NO

) designated NO

. By defini-

tion [NO

] = [NO] + [NO

Typical applications include analyzing ve-

hicular exhaust emissions from internal com-

bustion engines and monitoring the effluent

from stationary (stack) sources

The analyzer utilizes the chemiluminescent

method of detection In the nitric oxide deter-

mination, sample NO is quantitatively con-

verted into NO

by gas-phase oxidation with

molecular ozone produced within the analyzer

from air or oxygen supplied by an external

cylinder. A characteristic of this reaction is

the elevation of approximately 10% of the NO

molecules to an electronically-excited state,

followed by immediate reversion to the

non-excited state accompanied by emission of

photons.

The emitted photons impinge on a photomul-

tiplier detector generating a low-level DC cur-

rent. The current is amplified to drive a front

panel meter and an accessory potentiometric

recorder if desired.

To minimize noise and reduce dark current,

the photomultiplier tube is mounted in a ther-

moelectrically-cooled housing with tempera-

ture held constant at about 59

F (15

C).

Control circuitry is contained in the 652831

Cooler Temperature Controller/Power Supply

Assembly. The power supply circuit provides

a high-current source of DC voltage. A ther-

mistor sensor attached to the housing, and an

associated switching transistor, control a pass

transistor, providing closely regulated on-off

control.

Attached to the cooler housing is thermal fuse

F3, setpoint 150

F (65

C). This fuse protects

the thermoelectric cooler against the over-

heating that otherwise could occur as a result

of excessively high ambient temperature or

failure of a fan.

Figure 1-1. Model 951A NO/NO

Analyzer

CONVERTER

ADJUST

ZERO

SPAN

PPM RANGE

10 AUTO

25 10000

100 2500

250 1000

MODE

NO NOx

OFF

Rosemount Analytical

Model 951A NO/NOx Analyzer

Instruction Manual

556383-Z

March 2002

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

Model 951A

CAUTION

EXCESSIVE HEAT

Do not operate this analyzer without the air

duct covering the cooling fins of the ther-

moelectric cooler. Excessive heat may

damage the cooling devices. The cooler

indicator lamp DS1 (mounted on the upper

left side of the inner flow regulator panel

and can be viewed through the window)

will cycle on and off until a control point is

reached.

Analyzer functioning for the NO

determina-

tion is identical to that described above for the

NO determination except that, before entry

into the reaction chamber, the sample is

routed through a converter where the NO

component is dissociated to form NO. In-

strument response is proportional to total NO

in the converted sample, that is the sum of the

NO present in the original sample plus the NO

produced by dissociation of NO

To minimize system response time an internal

sample-bypass feature provides high-velocity

sample flow through the analyzer.

The electronic circuitry is modularized, utiliz-

ing plug-in printed circuit boards with solid

state components and test jacks for easy

troubleshooting and replacement.

If desired, the Model 951A may be factory

equipped with various optional features in ad-

dition to the standard features of the basic in-

strument. Brief descriptions of the principal

options are given in the following section.

1-2 OPTIONS

a. Range I.D.

This option provides contact closure sig-

nals that enable a computer or other ex-

ternal device to identify the setting of the

front panel PPM RANGE Switch. The

Model 951A is designed to continuously

measure the concentration of a single

component of interest in a flowing gas

mixture. 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 sam-

ple streams. However, analysis of

multi-component streams is possible if the

various components of the background

gas occur in relatively constant ratio, or

have similar thermal conductivity's.

b. Remote Range Change

For applications where remote operation

of the analyzer is desired, as in an emis-

sion test console, the Remote Range

Change Option may be used. This option

permits either the operator or a computer

to override and disable the front panel

MODE and PPM RANGE Switches and

thus to control selection of: (a) NO or NO

mode, and (b) ppm range.

The unit consists of an electrical plug

connector with plug-in logic card and har-

ness for connection to a rear panel termi-

nal strip on the analyzer.

c. Range I.D. and Remote Range Change

The Range I.D./Remote Range Change

Option is a combination of the Range I.D.

and Remote Range Change options. This

option is compatible with a user supplied

remote control system employing a 24

VDC digital output and input for analyzer

range control and analyzer range sense,

respectively. It is completely integral

within the analyzer and provides a termi-

nal strip on the rear of the analyzer for

connections of the user cable.

d. Sample Pump

The basic Model 951A is designed to ac-

cept pressurized samples. To permit

analysis of gases at atmospheric or sub-

atmospheric pressure the analyzer may

be equipped with an optional, internally

mounted sample pump. This option is not

available on Low Tempco versions of the

951A. An external, accessory pump can

be ordered instead.

Instruction Manual

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March 2002

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

Model 951A

1-3 SPECIFICATIONS

Catalog Number ............................ 193702 Model 951A NO/NO

Analyzer

Ranges .......................................... Selectable fullscale range of 10, 25, 100, 250, 1000, 2500 and

10,000 parts per million

Sensitivity ...................................... 0.1 ppm on 10 ppm range

Linearity ......................................... ±1% of fullscale

The specified linearity is obtainable throughout the operating range,

contingent upon use of an appropriate combination of oxygen

source gas, gas pressure settings and electronic adjustments.

Response Time (Electronic Plus Flow)

Standard Sample Capillary.... Approximately one second on all ranges except 10 ppm.

Approximately three seconds on 10 ppm range.

Auxiliary Sample Capillary..... Five seconds on all ranges.

For such applications as monitoring stack sources, where compara-

tively slow response is desired, an internal switch provides an op-

tional electronic response time of approximately 10 seconds to 90%

of fullscale on all ranges.

Precision........................................ ±5% of fullscale

Stability

Zero ....................................... 1% of fullscale in 24 hours

Span ...................................... 1% of fullscale in 24 hours

Detector Operating Temperature .. Atmospheric

Recorder Output............................ Selectable output of 10 millivolts, 100 millivolts, 1 volt or 5 volts

Ambient Temperature.................... 40°F to 100°F (4.4°C to 37.7°C)

Electrical Power Requirements ..... 107 to 127 VAC, 50/60 Hz, 1000 watts

Dimensions.................................... 9.0 x 17.8 x 22.0 inches (228.6 x 450.9 x 558.8mm) HxWxD

Weight ........................................... 76 lbs. (34.5 kg)

Instruction Manual

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March 2002

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

Model 951A

Instruction Manual

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March 2002

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

Model 951A

SECTION 2

INSTALLATION

2-1 FACILITY PREPARATION

Sections 2-1a through 2-1c provide informa-

tion that may be required prior to installation

of the analyzer.

a. Outline and Mounting Dimensions

Significant dimensions are shown in Fig-

ure 2-1.

b. Location

Install analyzer in a clean area, not sub-

ject to excessive vibration or extreme

temperature variations .

Preferably, the analyzer should be

mounted near the sample stream, to

minimize sample transport time. A circuit

controlled by a thermal switch holds inter-

nal temperature of the analyzer to the cor-

rect operating temperature for ambient

temperatures in the range 40

F to 100

(4.4

C to 37.7

C). Temperatures outside

these limits necessitate use of special

temperature controlling equipment or en-

vironmental protection.

Preferably, the cylinders of air (or oxygen)

and span gas should be located in an

area of relatively constant ambient tem-

perature.

c. Power Requirements

Electrical power requirements are 107 to

127 VAC, 50/60 Hz, 1000 watts.

2-2 UNPACKING

Unpack instrument carefully. Preparatory to

shipment, the photomultiplier tube housing

and the sample pump (if instrument is so

equipped) are immobilized with hold down

screws, inserted from the bottom of the in-

strument and marked with red paint for identi-

fication. The hold down screws must be

removed prior to operation of the instrument.

In the event the instrument is ever returned to

the factory, these screws must be replaced to

ensure safe shipment.

2-3 GAS REQUIREMENTS

CAUTION

HIGH PRESSURE GAS CYLINDERS

This instrument requires use of oxygen

and a known standard gas in high pres-

sure cylinders. Refer to Handling and

Storing High Pressure Gas Cylinders lo-

cated on page P-4.

a. Air or Oxygen

This is used as both (a) oxygen source for

generation of the ozone required for the

chemiluminescent reaction, and (b) stan-

dard gas for zero calibration. Gas for both

purposes may be supplied from a single

cylinder and routed through a tee. Alter-

natively, two separate cylinders may be

used.

Oxygen is usable in all applications. Air is

suitable for the oxygen source only if the

desired fullscale operating range is 2500

ppm or less. Breathing grade oxygen or

air is recommended. Clean, dried ambient

air containing less than 0.1 ppm nitric ox-

ide may be used, provided that its dew-

point is below -10

F (-23

C). If air is

insufficiently dried, or contains excessive

nitric oxide, instrument response will not

be linear to 2500 ppm.

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March 2002

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

Model 951A

b. Span Gas

This is a standard gas of accurately

known composition, used to set an up-

scale calibration point.

Alternative span gases are:

1. The usual span gas is NO in a back-

ground of nitrogen.

2. For span check or adjustment in the

mode, the span gas may be NO

in a background of air or nitrogen.

3. For convenient calibration in either

the NO or NO

mode, the span gas

may be a cylinder gas mixture con-

sisting of known concentrations of

both NO and NO

in a background of

nitrogen.

NOTE

For maximum calibration accuracy, the

concentration of NO and/or NO

in the

span gas should be as near as possi-

ble to that in the sample gas. Also, the

span gas should be supplied to the

rear panel SAMPLE inlet at the same

pressure as the sample gas. To ensure

constant pressure, a pressure regula-

tor may be utilized immediately up-

stream from the SAMPLE inlet.

Preferably, each gas used should be sup-

plied from a tank or cylinder equipped

with a clean, non-corrosive type two stage

regulator. In addition, a shut-off valve is

desirable. If possible, install the gas cylin-

ders in an area of relatively constant am-

bient temperature.

2-4 SAMPLE REQUIREMENTS

The Sample must be relatively clean and dry

before entering the analyzer. In general, be-

fore admission to the analyzer, the sample

should be filtered to 2 microns and should

have a dewpoint below 90

F (32

C). The fac-

tory can provide technical assistance if de-

sired .

Proper supply pressures for sample and span

gases depend on whether or not the analyzer

is equipped with the optional 632748 Sample

Pump:

For the basic Model 951A, without sample

pump, sample must be supplied to the SAM-

PLE inlet at a pressure of 5 to 10 psig (34.5 to

69 kPa). This ensures that the normal bypass

flow of two liters per minute will be obtainable

by adjustment of the BYPASS Needle Valve.

(Proper bypass flow is essential for rapid

system response and stable flow into reaction

chamber.)

For an analyzer equipped with sample pump,

the acceptable pressure range at the SAM-

PLE inlet is 0 to 5 psig (0 to 34.5 kPa). The

pump pressurizes the sample to between 5

and 10 psig (34.5 to 69 kPa) for supply to the

internal flow system.

2-5 GAS CONNECTIONS

1. Remove plugs and caps from all inlet and

outlet fittings. See Figure 2-4.

2. Connect EXHAUST outlet to outside vent

via tubing with O.D. of 1/4 inch (6.3mm)

or larger.

3. Connect external lines from air (or oxy-

gen) cylinder and sample source to corre-

sponding rear panel inlet ports. For

sample line, stainless steel tubing is rec-

ommended.

4. Adjust regulator on air (or oxygen) cylin-

der for output pressure of 35 to 40 psig

(251 to 276 kPa).

5. Supply sample gas to rear panel SAMPLE

inlet at appropriate pressure: 5 to 10 psig

(34.5 to 69 kPa) for basic analyzer without

sample pump; 0 to 5 psig (0 to 34.5 kPa)

for analyzer with pump.

Instruction Manual

556383-Z

March 2002

Rosemount Analytical Inc. A Division of Emerson Process Management Installation 2-3

Model 951A

Figure 2-1. Model 951A Outline and Mounting Dimensions

19.0

[482]

8.7

[222]

9.0

[228]

1.0

[25.4]

20.2

[513]

1.25

[32]

6.0

[152]

1.25

[32]

4.5

[

114

]

2.0

[51]

7.0

[178]

8.7

[221]

2.8

[70]

4.6

[118]

6.6

[

168

]

18.3

[465]

18.3

[465]

18.3

[465]

18.3

[465]

18.3

[465]

8.5

[216]

∅

.25

[63]

6 PLC'S

RECOMMENDED PANEL CUTOUT

3. ALLOW 16 INCHES IN FRONT OF INSTRU-

MENT FOR DOOR SWING.

2. ALLOW 12 INCHES MINIMUM CLEARANCE

ABOVE INSTRUMENT FOR MAINTENANCE..

1. RECOMMENDED MOUNTING HARDWARD:

10-32 MACHINE SCREWS (SUPPLIED BY

CUSTOMER).

DIMENSIONS

Inch

Instruction Manual

556383-Z

March 2002

2-4 Installation Rosemount Analytical Inc. A Division of Emerson Process Management

Model 951A

Thermocouple

Connector TB9

Sample Inlet

ir Inlet

Exhaust

Fuse F1 Fuse F2

Recorder Connection TB4-2

Range I.D. Connec-

tor J10 (option)

Cable Gland For Re-

corder Cable

AC Power Cable

Recorder Connection TB4-1

Figure 2-2. Front Panel Indicators and Controls

Figure 2-3. Controls and Adjustments Located Behind Swing Out Front Panel

Figure 2-4. Rear Panel

FLOW

BALANCE

OZONE

OFF

SPAN

ZERO

CONVERTER

ADJUST

PPM RANGEMODE

250

100

1000

2500

10000

AUTO

NO NOx

Rosemount Anal

tical

Model 951A NO/NOx Anal

zer

PPM Range Switch

Bypass Flowmeter

Ozone Pressure

Gauge

Meter

AC Power

On/off Switch

Mode

Switch

Converter Adjust

Converter Indicator

Span Adjust

Zero Adjust

Sample Pressure Gauge

Rosemount Anal

tical

Model 951A NO/NOx Anal

zer

FLOW

BALANCE

OZONE

OFF

100

REC

OUTPUT

FAST SLOW

RESPONSE

R22

R34

CALIB

R16

R33

CALIB

R31

CALIB

R32

CALIB

INPUT

Ozone Off Push-

button Switch

Photomultiplier High

Voltage Interlock

Switch

Recorder Output

Select Switch

Response Time Selector Switch

Bypass Needle Valve

Ozone Pressure

Regulator

Flow Balance Needle Valve

Sample Backpressure Regulator

Bypass Flowmeter

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Rosemount 951A NO/NOx Analyzer-Rev Z Owner's manual

Brand: Rosemount

Model: 951A NO/NOx Analyzer-Rev Z

Category: Oxygen Equipment

Type: Owner's manual

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Rosemount 951A NO/NOx Analyzer-Rev Z Owner's manual

Rosemount 951A NO/NOx Analyzer-Rev Z Owner's manual

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