Rosemount 951C NOx Analyzer-Rev N Manuals & Guides

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Page 1

Rosemount Analytical

ODEL

951C

NSTRUCTION MANUAL

X ANALYZER

PN 748214

Page 2

OTICE

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.

SNOOP® is a registered trademark of NUPRO Co.

Manual Part Number 748214-N September 1997 Printed in U.S.A.

Rosemount Analytical Inc.

4125 East La Palma Avenue

NAHEIM

ALIFORNIA

, C

92807-1802

Page 3

ONTENTS

REFACE

PURPOSE/SAFETY SUMMARY........................................................................P-1

SPECIFICATIONS - LO RANGE ........................................................................P-4

SPECIFICATIONS - HI RANGE .........................................................................P-5

CUSTOMER SERVICE, TECHNICAL ASSISTANCE AND FIELD SERVICE ....P-6

RETURNING PARTS TO THE FACTORY .........................................................P-6

TRAINING ......................................................................................................P-6

DOCUMENTATION............................................................................................P-6

COMPLIANCES..................................................................................................P-7

CONDENSED STARTUP AND CALIBRATION PROCEDURE..........................P-9

ECTION

1.1 OVERVIEW ...............................................................................................1-1

1.2 APPLICATIONS.........................................................................................1-2

ECTION

2.1 UNPACKING.............................................................................................2-1

2.2 LOCATION ...............................................................................................2-1

2.3 VOLTAGE REQUIREMENTS...................................................................2-1

2.4 ELECTRICAL CONNECTIONS ................................................................2-2

2.5 GAS REQUIREMENTS ............................................................................2-5

2.6 SAMPLE REQUIREMENTS .....................................................................2-6

2.7 GAS CONNECTIONS...............................................................................2-6

2.8 LEAK TEST ..............................................................................................2-7

1. I

2. I

2.4.1 Line Power Connections.............................................................2-2

2.4.2 Potentiometric Recorder Connections.........................................2-4

2.4.3 Current Recorder Connections....................................................2-4

NTRODUCTION

NSTALLATION

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ECTION

3.1 FRONT PANEL INDICATORS AND CONTROLS.....................................3-1

3.2 STARTUP PROCEDURE.........................................................................3-2

3.3 CALIBRATION .........................................................................................3-4

3.4 ROUTINE OPERATION...........................................................................3-5

3.5 CONVERTER TEMPERATURE ADJUSTMENT PROCEDURE..............3-5

3.6 MEASUREMENT OF CONVERTER EFFICIENCY..................................3-7

3.7 RECOMMENDED CALIBRATION FREQUENCY....................................3-8

ECTION

3. I

3.1.1 Display ......................................................................................3-1

3.1.2 Range Selection.........................................................................3-1

3.1.3 Sample Pressure Gauge............................................................3-2

3.1.4 Ozone Pressure..........................................................................3-2

3.1.5 Zero and Span Potentiometers...................................................3-2

3.1.6 Ozone Interlock ..........................................................................3-2

3.3.1 Zero Calibration..........................................................................3-4

3.3.2 Upscale Calibration ....................................................................3-4

4. T

NITIAL STARTUP AND OPERATION

HEORY

4.1 NITRIC OXIDE DETERMINATION BY CHEMILUMINESCENCE

METHOD ...................................................................................... 4-1

4.2 ANALYZER FLOW SYSTEM....................................................................4-1

4.2.1 Flow of Sample, Standard Gas or Zero Gas to

Reaction Chamber........................................................4-1

4.2.2 Ozone Generation......................................................................4-2

4.3 SIGNAL PROCESSING ELECTRONICS SYSTEM.................................4-2

4.4 ANALYZER THERMAL SYSTEM.............................................................4-3

ECTION

5.1 SYSTEM CHECKS AND ADJUSTMENTS................................................5-1

5.2 SERVICING FLOW SYSTEM ..................................................................5-3

5. R

5.1.1 Display Fullscale Span Adjustment............................................5-1

5.1.2 Overall Sensitivity.......................................................................5-2

5.1.3 Ozone Output.............................................................................5-2

5.1.4 Background Current ...................................................................5-3

5.1.5 Excessive Photomultiplier Dark Current.....................................5-3

5.2.1 Cleaning Sample Capillary .........................................................5-3

5.2.2 Ozone Restrictor Fitting..............................................................5-4

OUTINE SERVICING

5.3 PHOTOMULTIPLIER TUBE/REACTION CHAMBER ..............................5-5

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ONTENTS

ECTION

5.4 OZONE GENERATION SYSTEM.............................................................5-8

5.5 CONVERTER ASSEMBLY.......................................................................5-9

5.6 SERVICING ELECTRONIC CIRCUITRY..................................................5-10

ECTION

6.1 CIRCUIT BOARD REPLACEMENT POLICY.............................................6-1

6.2 REPLACEMENT PARTS...........................................................................6-1

ENERAL PRECAUTIONS FOR HANDLING

ARRANTY

IELD SERVICE AND REPAIR FACILITIES

5. R

5.3.1 Photomultipler Tube/Reaction Chamber Removal......................5-5

5.3.2 Cleaning Reaction Chamber.......................................................5-5

5.3.3 Photomultiplier Tube and Housing..............................................5-7

5.3.4 Replacement of Photomultiplier Tube.........................................5-7

5.4.1 Lamp/Housing Removal..............................................................5-8

5.4.2 UV Lamp Replacement...............................................................5-9

5.4.3 Power Supply Removal...............................................................5-9

6. R

OUTINE SERVICING (CONTINUED

EPLACEMENT PARTS

TORING HIGH PRESSURE CYLINDERS

& S

)

IGURES

2-1 POWER SUPPLY BOARD VOLTAGE SELECT SWITCHES...................2-3

2-2 TEMPERATURE CONTROL BOARD .......................................................2-3

2-3 CABLE GLAND..........................................................................................2-4

2-4 REAR VIEW OF MODEL 951C (COVER REMOVED)...............................2-5

3-1 MODEL 951C CONTROLS, INDICATORS AND ADJUSTMENTS ...........3-1

3-2 SIGNAL BOARD.......................................................................................3-3

3-3 POWER SUPPLY BOARD.......................................................................3-4

4-1 ANALYZER SIGNAL CONDITIONING CIRCUIT......................................4-3

4-2 ANALYZER THERMAL SYSTEM.............................................................4-4

6-1 MAJOR ASSEMBLIES OF THE MODEL 951C........................................6-3

6-2 PHOTOMULTIPLIER HOUSING ASSEMBLY..........................................6-4

6-3 CONVERTER ASSEMBLY.......................................................................6-5

6-4 CASE HEATER TEMPERATURE CONTROL ASSEMBLY .....................6-6

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951C NOX A

ODEL

ABLES

NALYZER

3-1 RESISTANCE OF CONVERTER TEMPERATURE SENSOR VS.

TEMPERATURE...........................................................................3-6

RAWINGS (LOCATED IN REAR OF MANUAL

654063 INSTALLATION DRAWING 654090 FLOW DIAGRAM, LOW RANGE 654093 FLOW DIAGRAM, HIGH RANGE

)

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REFACE

URPOSE/SAFETY SUMMARY

To avoid explosi on, l oss of l i fe, per sonal i nj ury and damage to this equipment and on-site property, all personnel authorized to install, operate and service the Model 951C NOx Analyzer should be thoroughly familiar with and strictly follow the instructions in this manual.

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

Save these instructions.

DANGER

personal injury, death, or substantial property damage if the warning is ignored.

WARNING

personal injury, death, or substantial property damage if the warning is ignored.

CAUTION minor

NOTE

important but not hazard-related.

is used to indicate the presence of a hazard which

personal injury or property damage if the warning is ignored.

is used to indicate installation, operation or maintenance information which is

will

cause

can

cause

will or can

severe

cause

WARNING: 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.

This instrument was shipped from factory set up to operate on 115 volt 50/60 Hz. For operation on 230 volt 50/60 Hz, refer to Section 2.3.

For safety and proper performance this instrument must be connected to a properly grounded three-wire source of power.

WARNING: INTERNAL ULTRAVIOLET LIGHT HAZARD

Ultraviolet light from the ozone generator can cause permanent eye damage. Do not look directly at the ultraviolet source in ozone generator. Use of ultraviolet filtering glasses is recommended.

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WARNING: TOXIC CHEMICAL HAZARD

This instrument generates ozone which is toxic by inhalation and is a strong irritant to throat and lungs. Ozone is also a strong oxidizing agent. Its presence is detected by a characteristic pungent odor.

The instrument exhaust contains both ozone and nitrogen dioxide, both toxic by inhalation, and may contain other constituents of the sample gas which may be toxic. Such gases include various oxides of nitrogen, unburned hydrocarbons, carbon monoxide and other products of combustion reactions. Carbon monoxide is highly toxic and can cause headache, nausea, loss of consciousness, and death.

Avoid inhalation of the ozone produced within the analyzer and avoid inhalation of the sample and exhaust products transported within the analyzer. Avoid inhalation of the combined exhaust products at the exhaust fitting.

Keep all tube fittings tight to avoid leaks. See Section 2.6 for Leak Test Procedure.

Connect rear exhaust outlet to outside vent by a 1/4 inch (6.3 mm) or larger stainless steel or Teflon* line. Check vent line and connections for leakage.

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 Paragraphs 2.5 and 3.3. See also General Precautions for Handling and Storing High Pressure Gas Cylinders, following Section Six.

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WARNING: TOXIC AND OXIDIZING GAS HAZARDS

The ozone generator lamp contains mercury. Lamp breakage could result in mercury exposure. Mercury is highly toxic if absorbed through skin or ingested, or if vapors are inhaled.

HANDLE LAMP ASSEMBLY WITH EXTREME CARE.

If lamp is broken, avoid skin contact and inhalation in the area of the lamp or the mercury spill.

Immediately clean up and dispose of the mercury spill and lamp residue as follows:

•

Wearing rubber gloves and goggles, collect all droplets of

mercury by means of a suction pump and aspirator bottle with long capillary tube. Alternatively, a commercially available mercury spill clean-up kit, such as J. T. Baker product No. 4439-01, is recommended.

REFACE

•

Carefully sweep any remaining mercury and lamp debris into

a dust pan. Carefully transfer all mercury, lamp residue and debris into a plastic bottle which can be tightly capped. Label and return to hazardous material reclamation center.

•

Do not place in trash, incinerate or flush down sewer.

•

Cover any fine droplets of mercury in non-accessible

crevices with calcium polysulfide and sulfur dust.

CAUTION: TOPPLING HAZARD

This instrument’s internal pullout chassis is equipped with a safety stop latch located on the left side of the chassis.

When extracting the chassis, verify that the safety latch is in its proper (counter-clockwise) orientation.

If access to the rear of the chassis is required, the safety stop may be overridden by lifting the latch; however, further extraction must be done very carefully to insure the chassis does not fall out of its enclosure.

If the instrument is located on top of a table or bench near the edge, and the chassis is extracted, it must be supported to prevent toppling.

Failure to observe these precautions could result in personal injury and/or damage to the product.

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PECIFICATIONS

ANGES

EPEATABILITY

ERO/SPAN DRIFT

ESPONSE TIME

(ELECTRONIC

ENSITIVITY

ETECTOR OPERATING

RESSURE

OTAL SAMPLE FLOW RATE

AMPLE PRESSURE

ZONE GENERATOR GAS

MBIENT TEMPERATURE

ANGE

+ F

- LO R

)

LOW

ANGE

0 to 10, 0 to 25, 0 to 100, 0 to 250 ppm NOx within 0.1 ppm or ±1% of fullscale, whichever is greater less than ±0.1 ppm or ±1% of fullscale, whichever is

greater, in 24 hours at constant temperature less than ±0.2 ppm or ±2% of fullscale, whichever is

greater, over any 10°C interval from 4 to 40°C (for rate change of 10°C or less per hour)

90% of fullscale in less than 1 minute

less than 0.1 ppm or 1% of fullscale, whichever is greater atmospheric

1 Liter per minute at 20 psig

138 kPa (20 psig) U.S.P. breathing-grade air 4 to 40°C (40 to 104°F)

NALOG OUTPUT

OWER REQUIREMENTS

NCLOSURE

IMENSIONS

EIGHT

Potentiometric: Isolated Current:

0 to +5 VDC, 2000 ohm minimum load

Field-selectable 0 to 20 or 4 to 20 mA,

700 ohm maximum load

Display

: Digital, 4-1/2 digit LCD, readout in engineering

units, backlighted

115/230 VAC ±10%, 50/60 ±3 Hz, 570 W maximum General purpose for installation in weather-protected

areas

22.0 cm (8.7 in) H

48.3 cm (19 in.) W

48.3 cm (19 in.) D

22.2 kg (49 lbs) approximate

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REFACE

PECIFICATIONS

ANGES

EPEATABILITY

ERO/SPAN DRIFT

ESPONSE TIME

(ELECTRONIC

ENSITIVITY

ETECTOR OPERATING

RESSURE

OTAL SAMPLE FLOW RATE

AMPLE PRESSURE

ZONE GENERATOR GAS

MBIENT TEMPERATURE

ANGE

+ F

- HI R

)

LOW

ANGE

0 to 100, 0 to 250, 0 to 1000, 0 to 2500 ppm NOx within 0.1 ppm or ±1% of fullscale, whichever is greater less than ±1.0 ppm or ±1% of fullscale, whichever is

greater, in 24 hours at constant temperature less than ±2.0 ppm or ±2% of fullscale, whichever is

greater, over any 10°C interval from 4 to 40°C (for rate change of 10°C or less per hour)

90% of fullscale in less than 1 minute

less than 0.1 ppm or 1% of fullscale, whichever is greater atmospheric

1 Liter per minute at 20 psig

138 kPa (20 psig) U.S.P. breathing-grade air 4 to 40°C (40 to 104°F)

NALOG OUTPUT

OWER REQUIREMENTS

NCLOSURE

IMENSIONS

EIGHT

Potentiometric: Isolated Current:

0 to +5 VDC, 2000 ohm minimum load

Field-selectable 0 to 20 or 4 to 20 mA,

700 ohm maximum load

Display:

Digital, 4-1/2 digit LCD, readout in engineering

units, backlighted

115/230 VAC ±10%, 50/60 ±3 Hz, 570 W maximum General purpose for installation in weather-protected

areas

22.0 cm (8.7 in) H

48.3 cm (19 in.) W

48.3 cm (19 in.) D

22.2 kg (49 lbs) approximate

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NALYZER

USTOMER SERVICE

For order administration, replacement Parts, application assistance, on-site or factory repair, service or maintenance contract information, contact:

ETURNING PARTS TO THE FACTORY

Before returning parts, contact the Customer Service Center and request a Returned Materials Authorization (RMA) number. Please have the following information when you call:

Order Number.

Prior authorization by the factory must be obtained before returned materials will be accepted. Unauthorized returns will be returned to the sender, freight collect.

When returning any product or component that has been exposed to a toxic, corrosive or other hazardous material or used in such a hazardous environment, the user must attach an appropriate Material Safety Data Sheet (M.S.D.S.) or a written certification that the material has been decontaminated, disinfected and/or detoxified.

Model Number, Serial Number, and Purchase Order Number or Sales

, T

ECHNICAL ASSIST ANCE AND FIELD SERVICE

Rosemount Analytical Inc.

Process Analytical Division

Customer Service Center

1-800-433-6076

Return to:

Rosemount Analytical Inc.

4125 East La Palma Avenue

Anaheim, California 92807-1802

RAINING

A comprehensive Factory Training Program of operator and service classes is available. For a copy of the the Technical Services Department at:

OCUMENTATION

The following Model 951C NOx Analyzer instruction materials are available. Contact Customer Service or the local representative to order.

748214 Instruction Manual (this document)

Current Operator and Service Training Schedule

Rosemount Analytical Inc.

Phone: 1-714-986-7600

FAX: 1-714-577-8006

contact

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OMPLIANCES

This product satisfies all obligations of all relevant standards of the EMC framework in Australia and New Zealand.

REFACE

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OTES

951C NOX A

NALYZER

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ONDENSED STARTUP AND CALIBRATION

ROCEDURE

The following summarized instructions on startup and calibration are intended for operators already familiar with the analyzer.

For initial startup, refer to detailed instructions provided in Section 3.

1. Set slider switch on the Signal Board (Figure 3-2) to 250 ppm (see Figure 3-2).

2. Apply power to the analyzer. The analyzer will now require approximately one to two hours for temperature equilibrium before being ready for calibration.

3. Verify that the pressure regulator on the cylinder of zero gas (nitrogen or air) or sample gas is set for supply pressure of 10 to 17 psig.

4. Verify that the pressure regulator on the cylinder of air (ozonator supply) is set for supply pressure of 20 to 25 psig.

5. Establish correct pressure of sample gas:

a. Supply sample gas to rear-panel SAMPLE inlet at 10 to 17 psig (normally 15

psig).

b. Adjust SAMPLE Back Pressure Regulator so that SAMPLE Pressure Gauge

indicates the value appropriate to the desired operating range (normal operating pressure is 3 to 5 psig). See Figure 3-1.

6. Establish correct pressure of zero gas:

a. Supply zero gas to rear panel SAMPLE inlet and set to 15 psig. b. Note reading on SAMPLE Pressure Gauge. It should be the same as in Step 5b.

If not, adjust output pressure regulator on the zero gas cylinder as required.

7. Establish correct pressure of upscale standard gas:

a. Supply upscale standard gas to rear panel SAMPLE inlet. b. Note reading on SAMPLE Pressure Gauge. It should be the same as in Step 6b.

If not, adjust output regulator on cylinder of upscale standard gas as required.

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951C NOX A

NALYZER

Note Supply pressure for sample, upscale standard gas and zero air must be

the same. If not, the readout will be in error.

8. Zero Calibration. a. Set PPM RANGE Switch for range to be used for sample analysis. Set SPAN

Control at normal operating setting, if known, or at about mid-range if normal

setting is not known. b. Supply zero gas to rear panel SAMPLE inlet. c. Adjust ZERO Control for reading of zero on meter or recorder.

9. Upscale Calibration. a. Set PPM RANGE Switch at setting appropriate to the particular span gas. b. Supply upscale standard gas of accurately known NOx content to rear panel

SAMPLE inlet.

c. Adjust SPAN Control so that reading on meter or recorder is equal to the know

parts-per-million concentration of NOx in the span gas.

Note It is the responsibility of the user to measure efficiency of the NO

-to-NO

converter during initial startup, and thereafter at intervals appropriate to the application, normally once a month.

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NTRODUCTION

1.1 OVERVIEW

The Model 951C NOx Analyzer is designed to measure NOx using one of two sets of ranges designated as Hi or Lo. The Hi Range set consists of spans with ranges of 0-100, 0-250, 0-1000, and 0-2500 ppm NOx. The Lo Range set consists of spans with ranges of 0-10, 0-25, 0-100, and 0-250 ppm NOx.

The NOx analyzer continuously analyzes a flowing gas sample for NOx [nitric oxide (NO) plus nitrogen dioxide (NO2)]. The sum of the concentrations is continuously reported as NOx.

The analyzer is based on the chemiluminescence method of NO detection. The sample is continuously passed through a heated bed of vitreous carbon, in which NO2 is reduced to NO. Any NO initially present in the sample passes through the converter unchanged, and any NO2 is converted to an approximately equivalent (95%) amount of NO.

The NO is quantitatively converted to NO2 by gas-phase oxidation with molecular ozone produced within the analyzer from air supplied by an external cylinder. During this reaction, approximately 10% of the NO2 molecules are elevated to an electronically excited state, followed by immediate decay to the non-excited state, accompanied by emission of photons. These photons are detected by a photomultiplier tube, which in turn generates a DC current proportional to the concentration of NOx in the sample stream. The current is then amplified and used to drive a front panel display and to provide potentiometric and isolated current outputs.

To minimize system response time, an internal sample-bypass feature provides high-velocity sample flow through the analyzer.

The display blanks when the analyzer is 10% or more over-range. Selecting a less sensitive (higher) range restores the display function.

The case heater assembly of the Model 951C maintains the internal temperature at approximately 50oC (122oF).

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951C NOX A

NALYZER

1.2 APPLICATIONS

The Model 951C Analyzer has specific applications in the following areas:

Oxides of nitrogen (NOx) emissions from the combustion of fossil fuels in:

•

Vehicle engine exhaust Incinerators Boilers Gas appliances Turbine exhaust

Nitric acid plant emissions

•

Ammonia in pollution control equipment (with converter)

•

Nitric oxide emissions from decaying organic material (i.e., landfills)

•

1-2

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NSTALLATION

2.1 UNPACKING

Carefully examine the shipping carton and contents for signs of damage. Immediately notify the shipping carrier if the carton or its contents are damaged. Retain the carton and packing material until the instrument is operational.

2.2 LOCATION

See drawing 654063 for Outline and Mounting dimensions. Install analyzer in a clean area, free from moisture and excessive vibration, at a stable

temperature within 4 to 40°C. The analyzer should be mounted near the sample source to minimize

sample-transport time. A temperature control system maintains the internal temperature of analyzer at 50°C

(122°F) to ensure proper operation over an ambient temperature range of 4°C to 40°C (40°F to 110°F). Temperatures outside these limits necessitate use of special temperature-controlling equipment or environmental protection. Also, the ambient temperature should not change at a rate exceeding 10°C/hr.

The cylinders of air and span gas should be located in an area of constant ambient temperature (±10°C).

2.3 VOLTAGE REQUIREMENTS

WARNING: ELECTRICAL SHOCK HAZARD

For safety and proper performance this instrument must be connected to a properly grounded three-wire source of power.

This instrument was shipped from the factory set up to operate on 115 VAC, 50/60 Hz electric power. For operation on 230 VAC, 50/60 Hz, position voltage select switches S1, S2, S3 (located on the Power Supply Board, Figure 2-1) and S3 (located on the Temperature Control Board, Figure 2-2) must be in the 230 VAC position.

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951C NOX A

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NALYZER

Refer to Figure 2-4. Remove the 6.25 A fuse (P/N 902413) and replace with the 3.15 A fuse (P/N 898587) provided in the shipping kit.

2.4 ELECTRICAL CONNECTIONS

The power and output (recorder and current) cable glands are supplied loose in the shipping kit to allow cable installation to connectors or terminal strips.

Cable Gland Part No.

Power 899330 Recorder 899329

Remove rear cover to access terminals. Route each cable through the cable gland and connect to the appropriate connector or terminal strip, tighten the gland.

2.4.1 L

INE POWER CONNECTIONS

Refer to Figures 2-3, 2-4 and drawing 654063. If this instrument is located on a bench or table top or is installed in a protected rack, panel or cabinet, power may be connected via a 3-wire flexible power cord, minimum 18 AWG (max. O.D. 0.480", min. O./D. 0.270"), through the hole labeled POWER, utilizing connector gland (P/N

899330) provided. Route the power cable through the cable gland and connect the leads to TB1. Tighten

the cable gland adequately to prevent rotation or slippage of the power cable. Since the rear terminals do not slide out with the chassis, no excess power cable slack is necessary.

The following power cord and/or support feet (for bench top use) are available:

Power Cord 634061

•

North American power cord set (10 foot)

•

Enclosure Support Kit 634958

•

Enclosure support feet (4)

•

Pow er Cord/Encl osure Support Kit 654008

•

North American power cord set (10 foot)

•

Enclosure support feet (4)

•

If the instrument is permanently mounted in an open panel or rack, use electrical metal tubing or conduit.

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NSTALLATION

IGURE

J20

230V

115V

Set switch window for voltage required.

2-1. P

OWER SUPPLY BOARD VOLTAGE SELECT SWITCHES

115V

230V

115V

230V

115V

655340 POWER SUPPLY BD

230V

115V115V 115V

115V

C10

115V

IGURE

SENSOR

AR1

J18

R10 R11 R7 R8

CR1

R18R19

R13

R2R1

CR2

R17R16 R12

TEMP CONTROL BD

Set switch window for voltage required.

2-2. T

EMPERATURE CONTROL BOARD

3 2 1

J17

POWER LINE J5

230

115

POWER SUPPLY

J11

R15

R9 R5

J19

TEST

R14

1 2 1 2 3

T.I.F. HEATER

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951C NOX A

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NALYZER

2.4.2 P

OTENTIOMETRIC RECORDER CONNECTIONS

Refer to Figures 2-3, 2-4 and drawing 654063. Potentiometric recorder connec-tions are made on the rear panel. Route the potentiometric recorder cable through the cable gland in the hole labeled RECORDER OUTPUT and connect to VOLT OUTPUT terminals.

Potentiometric recorder cable specifications are as follows:

Distance from recorder to analyzer: 1000 feet (305 meters) maximum

•

Input impedance: Greater than 2000 ohms

•

Cable (user supplied): Two-conductor, shielded, min. 20 AWG

•

Voltage output: 0 to +5 VDC

•

2.4.3 C

URRENT RECORDER CONNECTIONS

Refer to Figures 2-3, 2-4 and drawing 654063. Current recorder connections are made on the rear panel. Route the current recorder cable through the cable gland in the hole labeled RECORDER OUTPUT and connect to CUR OUTPUT terminals

Current recorder interconnection cable specs are as follows:

Distance the recorder from analyzer: 3000 feet (915 meters).maximum

•

Load resistance: Less than 700 Ohms.

•

Cable (user supplied): Two-conductor, shielded, min. 20 AWG

•

As supplied by the factory, the current output produces a zero of 4 mA. The current output may be adjusted to produce a zero of 0 mA as follows:

1. Zero the instrument as in Section 3.4.

2. Adjust R23, the zero-adjust potentiometer on the Power Supply Board, to produce 0 mA current output.

INTERIOR EXTERIOR

Nut Gland Nut

IGURE

2-4

2-3. C

Rosemount Analytical

ABLE GLAND

Cable

September 1997

Case Wall

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Page 23

NSTALLATION

IGURE

20 PSI (138 kPa)

NOMINAL

2-4. R

SAMPLE

EXHAUSTAIR

10 PSI - 17 PSI

(70 kPa - 120 kPa)

EAR VIEW OF MODEL

951C (

RECORDER

OUTPUT

FUSE

CUR OUTPUT

Current Output Connections

COVER REMOVED

L1/HOT

L2/NEUT

GND

VOLT OUTPUT

+ - G + -

)

POWER

2.5 GAS REQUIREMENTS

The instrument requires two gases normally supplied from cylinders. They are:

Fuse

AC Power Connections

Recorder Connections

(U.S.P. B

REATHING GRADE

)

This is used as both (a) an oxygen source for generation of the ozone required for the chemiluminescence reaction, and (b) a standard gas for zero calibration (nitrogen can also be used). Gas for each purpose must be supplied from a separate cylinder due to different pressure requirements at ozonator and zero inlets.

PAN GAS

This is a standard gas of accurately known composition, used to set an upscale calibration point. The usual span gas is NO or NO2 in a background of nitrogen.

WARNING: HIGH PRESSURE GAS CYLINDERS

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951C NOX A

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NALYZER

Note For maximum calibration accuracy, the concentration of NO in the span

gas should be similar 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 regulator may be utilized immediately upstream from the SAMPLE inlet.

Each gas used should be supplied from a tank or cylinder equipped with a clean, non-corrosive type, two-stage regulator. In addition, a shut-off valve is desirable. Install the gas cylinders in an area of relatively constant ambient temperature.

2.6 SAMPLE REQUIREMENTS

The sample must be clean and dry before entering the analyzer. In general, before admission to the analyzer, the sample should be filtered to eliminate particles larger than two microns and have a dew point below 90°F (32°C). The factory can provide technical assistance if desired.

Proper supply pressure for sample, zero and span gases for the Model 951C is 20 psig (138 kPa).

2.7 GAS CONNECTIONS

WARNING: TOXIC AND OXIDIZING GAS HAZARDS

Keep all tube fittings tight to avoid leaks. See Section 2.8 for Leak Test Procedure.

Connect rear exhaust outlet to outside vent by a 1/4 inch (6.3 mm) or larger stainless steel or Teflon line. Check vent line and connections for leakage.

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1. Remove plugs and caps from all inlet and outlet fittings. (See Figure 2-4.)

2. Connect EXHAUST outlet to external vent via tubing with O.D. of 1/4-inch (6.3 mm) or larger. Use only stainless steel or Teflon tubing.

3. Connect external lines from ozonator air and sample sources to corresponding rear panel inlet ports. For sample line, stainless steel tubing is recommended.

4. Adjust regulator on ozonator air cylinder for output pressure of 20 to 25 psig (138 to 172 kPa). At least 20 psig should be present at rear of analyzer.

5. Supply sample gas to rear panel SAMPLE inlet at appropriate pressure: 20 psig (138 kPa). The nominal input pressure is 20 psig (138 kPa).

2.8 LEAK TEST

The following test is designed for sample pressure up to 5 psig (35 kPa).

1. Supply air or inert gas such as nitrogen at 5 psig (35 kPa) to analyzer sample and air input fittings.

NSTALLATION

2. Seal off analyzer exhaust fitting with a tube cap.

3. Use a suitable test liquid such as SNOOP (P/N 837801) to detect leaks. Cover all fittings, seals, or possible leak sources.

4. Check for bubbling or foaming which indicates leakage, and repair as required. Any leakage must be corrected before introduction of sample and/or application of electrical power.

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ODEL

OTES

951C NOX A

NALYZER

2-8

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(S1)

(

)

NITIAL STARTUP AND OPERATION

3.1 FRONT PANEL INDICATORS AND CONTROLS

3.1.1 D

ISPLAY

The display is a 4-digit liquid crystal device which always displays NOx concentration in parts-per-million. See Figure 3-1.

3.1.2 R

ANGE SELECTION

The Model 951C has eight customer selectable ranges, four LO ranges (10 ppm, 25 ppm, 100 ppm and 250 ppm) and four HI ranges (100 ppm, 250 ppm 1000 ppm and 2500 ppm). The range is selected by positioning the RANGE Switch (S1) and the three jumpers on the Signal Board to the d esired range controlling the recorde r output. Refer to Figure 3-2.

The display blanks for values 10% in excess of the range maximum. Moving the switch to the left selects a higher fullscale value and restores the display.

POWER SUPPLY BOARD (See Figure 3-3)

CASE HEATER TEMPERATURE CONTROL ASSEMBLY (See Figure 6-4) TEMPERATURE CONTROL BOARD (See Figure 2-2)

Voltage Select (S3)

Voltage Select (S1)

Voltage Select (S2)

SAMPLE PRESSURE GAUGE

SAMPLE PRESSURE REGULATOR (Adjustment Knob)

SIGNAL BOARD (See Figure 3-2)

Display (Signal Board DS1)

Adj. (R8)

Gain (R24)

Signal (R20)

Cal (R18)

Range Select Switch

Convertor Heater (R9)

Converter

Temp Check

(S4)

PMT High Voltage

R30

TP2

Current Output Zero (R23)

Current Output Span (R20)

Zero Control (Signal Board R100)

IGURE

748214-N

3-1. M

ODEL

Span Control (Signal Board R101)

951C C

Ozone Indicator Lamp (Signal Board DS2)

ONTROLS

NDICATORS AND ADJUSTMENTS

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3.1.3 S

AMPLE PRESSURE GAUGE

The internal SAMPLE pressure (nominally 4 psig, 28 kPa) is adjusted by rotation of the Sample Pressure Regulator. See Figure 3-1.

3.1.4 O

ZONE PRESSURE

The OZONE pressure is determined by the pressure regulator of the air supply cylinder. A nominal pressure of 20 to 25 psig (138 to 172 kPa) is recommended. Proper operation is indicated when the front panel OZONE indicator lamp is lit.

Note If ozone lamp does not light, increase pressure slightly by adjusting

pressure regulator control on the air cylinder.

3.1.5 Z

ERO AND SPAN POTENTIOMETERS

See Figures 3-1 and 3-2. Screwdriver access holes through the front panel allow adjustments of the ZERO and SPAN potentiometers (R100 and R101 on Signal Board.

3.1.6 O

ZONE INTERLOCK

The ozone-producing UV lamp will not ignite or stay lit unless adequate air pressure is present at the AIR inlet (see Figure 2-4). Nominal set point pressure is 20 to 25 psig.

3.2 STARTUP PROCEDURE

The following are detailed instructions on startup and calibration.

1. Supply electrical power to the analyzer. The analyzer will require approximately two hours for temperature equilibration before calibration.

2. On Signal Board, Figure 3-2, set PPM RANGE Switch (S1) to 250 ppm.

3. Establish correct pressure for air by the following: a. Adjust OZONE Pressure Regulator so that OZONE Pressure Gauge indicates

20 to 25 psig (138 to 172 kPa).

b. To establish correct pressure of zero gas, supply zero gas to rear panel SAMPLE

inlet. Note reading on internal SAMPLE Pressure Gauge. It should be the same as the nominal 4 psig (28 kPa) SAMPLE pressure indicated on the internal SAMPLE pressure gauge. This should remain constant when the analyzer input SAMPLE is switched from calibration gas standard to a zero gas standard. This may be assured by setting the delivery from the SAMPLE and the zero gas cylinder of span gas cylinder to the same value of delivery pressure, nominally 20 psig (138 kPa). If not, adjust output pressure regulator on zero g as cylinder as required.

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654050 SIGNAL CONTROL BD

NITIAL STARTUP AND OPERATION

Lo Hi

E6 E7

Lo Hi

E1 E2

E6 E7

DS2

SIGNAL IN

E6 E7

R28

R29

C14

R34

RP3

C15

R37

AR4

R38

RP2

AR5

AR6

R39 R40 R23

C12

C16

CR23

SPAN

10 100 25 250

TP6 TP 5 TP 4 TP3 TP2 TP1

E1 E2

DP SELECT

DS1

C13

R35

R17

R36

R101

CW S CCW

RANGE

CR1

R14 R12

10 100 25 250

RP1

CR13

CR12

CR14

CR11

CR2

R22

1 (10) 10 2 (25) 25 3 (100) 100 4 (250) 250

CR7

CR6

CR10

CR8

R19

CR9

C10

R13

ADJ. GAIN SIG. CAL.

R41

R27

R25 R24 R20 R18

CR15

C11

CR3

CR5

CR19

CR4

R21

R1R2R3R4R5R6R7R8R9

R15

R30 AR1

R31

R16

ZERO

R100

Range

(S1 pos)

CR17

CR16

CR22

CR20

CR21

VR1

CW S CCW

R42

CR18

R32 R33

C17

Q1 CE

AR2

R10

R11

ppm

Fullscale

(S1 pos)

1 (10) 100 2 (25) 250 3 (100) 1000 4 (250) 2500

C2 C1

AR3

Range

ppm

Fullscale

R101 - SPAN Potentiometer R100 - ZERO Potentiometer

IGURE

3-2. S

IGNAL BOARD

4. Establish correct pressure of sample gas by the following: a. Supply sample gas to rear panel SAMPLE inlet. b. Adjust SAMPLE Backpressure Regulator so internal SAMPLE Pressure Gauge

indicates the value appropriate to the desired operating range.

Note Inability to obtain a flow of one liter per minute at the EXHAUST outlet

usually indicates insufficient sample supply pressure at the SAMPLE inlet. Use a 2400 cc flowmeter (i.e., Brooks P/N 1350) at the EXHAUST outlet to measure flow.

5. Establish correct flow of upscale standard gas by the following:

a. Supply upscale standard gas to rear panel SAMPLE inlet.

b. Note reading on internal SAMPLE Pressure Gauge. It should be the same as in

Step 3b.

Note Supply pressures for sample and upscale standard gases must be the

same. Otherwise, readout will be in error.

The analyzer is now ready for calibration.

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R16

R14

R18

R12

CR5

R78

U23

C16

C18

CR16

U22

36R3

CR9

CR23

R69

J16

951C NOX A

ODEL

NALYZER

TP13

CR4

CONVERTOR

TP13

CR4

CONVERTOR

Q15

TP1

CONV TEMP

CHECK

R77

CR2

R27

CONV TEMP

CHECK

TP2 TP5 TP6 TP7 TP8

R6 R13

CR6

R15

Q14

U21

R62

R63

C20

R28

C17

TP2 TP5 TP6 TP7 TP8

AR1

R71

R68

R64

R34

CONV

R67

HTR

R11

J19

R72

RP1

U20

CR24

R76

R75

R74

R37

AR2

C19

CURRENT

SPAN

R22 R24 R25 R21 R19

CR15

R20

R26

VR2

VR1

VR3

TP14 TP15

VR6

1 2 3 4

R23

R20

CURRENT

OUTPUT

SPAN

ZERO

TP3 TP4

C11

J11

CR7

C13

G O

VR4

C14

CR8

C12

CR14

O G

C15

CR1

VR5

I G O

CR18

C29

VR7

G I O

CR2

C6 C5

VR8

O G I

C25

C27

CR19

C26

R61

R56

R60

R59

CR3

C23

C21

R48

R46

R44

R43 R41

VR9

J18

C28

Q13

CR20

R58

R57

J20

TP9 TP10 TP11 TP12

R54

R47

R49

R42

R40

R53

CR13

Q24

R68

R82

R81 R80 R45

R51 CR12

R55

J15

230V

115V

J17

C22

230V

115V

655340 POWER SUPPLY BD

J12

230V

115V

R17 R18

C10

115V

R30

CONV

PMT

HTR

THERMO COOLER

CR10

R29

TP14 TP15

CR1

J14

OUTPUT

ZERO

J13

RMT

THERMO COOLER

J19

R38

R39

R11

CR17

115V

230V

115V

230V

115V

IGURE

3-3. P

230V

115V

OWER SUPPLY BOARD

3.3 CALIBRATION

3.3.1 Z

3.3.2 U

ERO CALIBRATION

1. On the Signal Board, Figure 3-2, set PPM RANGE Switch for the same range that will be used during sample analysis. Set SPAN Control at about mid-range.

2. Supply zero gas to rear panel SAMPLE inlet.

3. After a stable reading is reached, adjust the zero by inserting a screwdriver in the ZERO slot on the front of the analyzer and turning until zero reading is obtained.

PSCALE CALIBRATION

1. On the Signal Board, Figure 3-2, set PPM RANGE Switch to the position appropriate to the particular span gas.

2. Supply upscale standard gas of accurately known NOx content to rear panel SAMPLE inlet.

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NITIAL STARTUP AND OPERATION

3. Adjust SPAN Control so that reading on display or recorder is equal to the known parts-per-million concentration of NOx in the span gas. If the correct reading is not initially attainable by adjustment of the SPAN Control, make the electronic adjustment in Step 4.

4. If necessary, increase sensitivity by raising photomultiplier voltage. This will interact with zero. Repeat Zero Calibration and Upscale Calibration (through step 3).

3.4 ROUTINE OPERATION

After calibrating analyzer per Section 3.3, supply sample to SAMPLE inlet. Set PPM RANGE Switch in appropriate position. The instrument will now continuously analyze the sample stream.

The Model 951C is designed for continuous operation. Normally, it is never turned off except for servicing or for a prolonged shutdown.

Note During periods of shutdown, turn off the ozone lamp by shutting off the

input air source.

3.5 CONVERTER TEMPERATURE ADJUSTMENT PROCEDURE

Once the appropriate high voltage and electronic gain have been selected such that the named calibration gas value is indicated by the Model 951C, the instrument is ready for adjustment of the converter temperature.

The vitreous carbon converter used in this analyzer has a low surface area which gradually increases during high temperature operation of the converter material.

Initially, the temperature of the peak of the converter efficiency starts at a relatively high value because significant heat must be supplied to make the converter active enough to reduce the input nitrogen dioxide to nitric oxide at the required 95% level. During the operation of the analyzer, the temperature of the peak will fall as the surface area of the converter is increased and less external energy is required to cause adequate conversion.

In extreme cases, where converter re-profiling has not been conducted, the converter is so active that it not only reduces nitrogen dioxide to nitric oxide, but it reduces the nitric oxide produced to nitrogen, which is not detected by the chemiluminescence reaction. The remedy in this case is to adjust the converter temperature to a lower value to improve the converter efficiency.

It is important that the converter temperature be periodically profiled to assure that it is running at its peak efficiency. An interval of one week is recommended. The nominal range of operational temperatures for the converter is 275°C to 400°C (527°F to 750°F). The operating temperature of the converter may be conveniently checked by momentarily depressing switch S4 on the Power Supply Board while monitoring the

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951C NOX A

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NALYZER

resistance across terminals TP1 and TP2. Table 3-1 allows for conversion of the observed resistance to the operating temperature for the converter.

Follow this procedure to optimize the operating temperature of the converter:

1. Power instrument and allow it to stabilize at operating temperature (one to two hours). Measure the operating temperature of the converter by the technique described above. Note the value for future reference.

2. Admit a calibration gas of known (NO2) concentration into the analyzer and note the concentration value determined when the full response has been achieved.

3. Refer to Figure 3-3. Turn the converter temperature adjust potentiometer R9, on the Power Supply Board one turn

counterclockwise

from the setting established at the factory, and allow fifteen minutes for operation at the new lower temperature setpoint. Recheck the response and note the value for later use.

4. Increase the temperature of the converter by rotating the converter temperature adjust potentiometer, R9, one quarter turn

clockwise

, wait fifteen minutes for thermal equilibrium and then re-measure the NO2 calibration gas value. Note its value. Repeat this procedure of one quarter turn adjustments of the potentiometer, waiting for thermal stability and determination of the calibration gas value until either a 95% value is obtained or the final one quarter turn adjustment gives an efficiency increase of less than one percent.

5. Decrease the temperature of converter operation by rotating the converter temperature adjust potentiometer one eighth of a turn counterclockwise. This places the converter at a temperature suitable for low ammonia interference and efficient NO2 conversion. Re-measure the indicated converter temperature and compare it to the initially recorded value.

ABLE

3-1. R

TEMPERATURE

(°C)

0 400

25 438 100 552 200 704 250 780 300 856 350 932 400 1008 450 1084

ESIST ANCE OF CONVERTER TEMPERA TURE SENSOR VS

RESISTANCE

(Ohms)

EMPERA TURE

. T

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NITIAL STARTUP AND OPERATION

Note Converter temperature is not a direct measure of converter efficiency.

Temperature measurement is for reference purposes only.

3.6 MEASUREMENT OF CONVERTER EFFICIENCY

It is the responsibility of the user to measure efficiency of the NO2-to-NO converter during initial startup, and thereafter at intervals appropriate to the application (normally once a month).

The above procedure optimizes the operating temperature of the converter. It also serves as an efficiency check if the concentration of NO2 in the calibration gas is documented accurate relative to National Institute of Standards and Technology (NIST) Reference Materials. If the concentration of the nitrogen dioxide calibration gas is not known accurately, this procedure still serves to adequately provide the correct converter operating temperature.

If the only available known standard is the nitric oxide calibration standard, the following procedure may be performed. This procedure checks converter efficiency through the utilization of gas-phase oxidation of nitric oxide into nitrogen dioxide over a range of nitrogen dioxide concentrations. This technique is abstracted and adapted from 40 CFR, Pt. 60, App. A, Method 20, Paragraph 5.6.

1. Select the appropriate instrument range.

2. Admit a nitric oxide in nitrogen NIST traceable calibration gas of a value between 45% and 55% of the instrument range selected to a clean, evacuated, leak tight Tedlar bag. Dilute this gas approximately 1:1 with a 20.9% oxygen, purified air.

3. Immediately attach the bag outlet to the input of the pump supplying pressurized gas to the analyzer. It is important to use a sample delivery pump which does not consume nitrogen dioxide as it delivers sample to the analyzer. Losses of nitrogen dioxide in the pump will be reported as converter inefficiency.

4. Operate the analyzer and continue to sample the diluted nitric oxide sample for a period of at least thirty minutes. If the nitrogen dioxide to nitric oxide conversion is at the 100% level, the instrument response will be stable at the highest value noted.

5. If the response at the end of the thirty minute period decreases more than 2.0 percent of the highest peak value observed, the system is not acceptable and corrections must be made before repeating the check. If it is determined that observed subnormal conversion efficiencies are real, and not due to errors introduced by nitrogen dioxide consumption in the sample pump or other parts of the sample handling system, verify that the converter is peaked at the optimum temperature before replacing with a new converter.

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951C NOX A

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NALYZER

3.7 RECOMMENDED CALIBRATION FREQUENCY

After initial startup or startup following a shutdown, the analyzer requires about two hours for stabilization before it is ready for calibration. Maximum permissible interval between calibrations depends on the analytical accuracy required, and therefore cannot be specified. It is recommended that initially the instrument be calibrated at least once every 8 hours. This practice should continue until experience indicates that some other interval is more appropriate.

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HEORY

4.1 NITRIC OXIDE DETERMINATION BY CHEMILUMINESCENCE METHOD

The chemiluminescence method for detection of nitric oxide (NO) is based on its reaction with ozone (O3) to produce nitrogen dioxide (NO2) and oxygen (O2). Some of the NO2 molecules thus produced are initially in an electronically excited state (NO2*). These revert immediately to the ground state, with emission of photons (essentially red light).

The reactions involved are:

NO + O3 → NO2* + O NO2* → NO2 + Red Light

As NO and O3 mix in the reaction chamber, the intensity of the emitted red light is proportional to the concentration of NO.

(Any NO2 initially present in the sample is reduced to NO by a heated bed of vitreous carbon through which the sample is passed before being routed to the reaction chamber.)

The intensity of the emitted red light is measured by a photomultiplier tube (PMT), which produces a current of approximately 3 X 10-9 amperes per part-pe r-million of NO in the reaction chamber.

4.2 ANALYZER FLOW SYSTEM

The analyzer flow system is shown in drawing 654090. Its basic function is to deliver regulated flows of sample, calibration gas, or zero gas and ozonized air to the reaction chamber. The discharge from the reaction chamber flows from the analyzer via the EXHAUST outlet.

4.2.1 F

748214-N

LOW OF SAMPLE

Suitably pressurized sample, standard gas or zero gas is supplied to the rear panel SAMPLE inlet.

TANDA RD GAS OR ZERO GAS TO REACTION CHAMBER

, S

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951C NOX A

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NALYZER

The flow rate of the selected gas into the reaction chamber is controlled by a back pressure regulator inside the analyzer. It provides an adjustable, controlled pressure on the upstream side, where gas is supplied to the calibrated, flow-limiting sample capillary. The regulator is adjusted for appropriate reading on the internal SAMPLE Pressure Gauge. For operation at NO and NO2 levels below 250 ppm, correct setting on the SAMPLE Pressure Gauge is 4 psig (28 kPa). This results in a flow of approximately 60 to 80 cc/min to the reaction chamber.

Excess sample is discharged with the effluent from the reaction chamber via the EXHAUST outlet. Bypass flow is set by the restrictor at 1 L/min (nominal) to ensure proper functioning of the SAMPLE Pressure Regulator and rapid system response. Excessive changes, on the order of 5 psig (35 kPa), in the pressure of the sample or standard gas will affect the bypass flow rate and can affect accuracy.

4.2.2 O

ZONE GENERATION

Suitably pressurized air from an external cylinder is supplied to the rear panel AIR inlet. The proper pressure setting is 20 to 25 psig (138 to 172 kPa). W ithin the ozone generator, a portion of the oxygen in the air is converted to ozone by exposure to an ultraviolet lamp. The reaction is:

3O2 → 2O

From the generator, the ozonized air flows into the reaction chamber for use in the chemiluminescence reaction.

4.3 SIGNAL PROCESSING ELECTRONICS SYSTEM

A block diagram of the signal-processing electronics is shown in Figure 4-1. Basic functions of these electronics are acceptance of PMT output and conversion of it to potentiometric and isolated current outputs, and providing a visual display of the concentration of the NOx in the sample stream. All functions except the high-voltage source and the voltage-to-current converter are contained on the Signal Control PC Board, 654050. The two exceptions are located on the Power Supply Board, 654059.

The PMT drives a high input impedance amplifier which produces a voltage between 0 and approximately 5 volts. The front panel Zero Control injects a small current into the PMT amplifier to null any current from the PMT which is not related to the concentration of NOx in the sample stream.

The PMT amplifier drives a programmable gain amplifier (PGA). The gain of the PGA is controlled by the Range Switch.

The PGA drives the Span Amplifier. The gain of this amplifier is controlled by the front panel Span Control. The output of the Span Amplifier is a voltage which is properly scaled to represent the concentration of NOx in the sample stream.

The Span Amplifier drives the front panel Display and associated electronics, and the isolated current output. It also provides the potentiometric output.

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4.4 ANALYZER THERMAL SYSTEM

The Analyzer Thermal System is shown in Figure 4-2. Its basic function is to provide a stable thermal environment for the PMT.

The temperature of the PMT must be held within a half-degree band at approximately 18°C if it is to produce a useful signal for low concentrations of NOx. This is accomplished by means of a solid-state cooler which houses the PMT. The heat which is radiated from the cooler is carried away by the Cooler Fan.

The solid-state cooler must work against a relatively constant load in order to maintain the temperature of the PMT. This load is produced by a case heater and exhaust fan which control the temperature inside the case within a one-degree band (approximately 50°C for ambient temperatures from 4°C to 40°C).

The electronics which support the Analyzer Thermal System and the NO2-to-NO Converter are contained on the Power Supply Board.

HEORY

IGURE

Photomultiplier

Tube

High Voltage

Supply

4-1. A

Signal/Control Board

PMT

Amplifier

Zero Cont rol

Programmable

Gain

Amplifier

Range Switch Span Control

Span

Amplifier

Power Supply Board

NALYZER SIGNAL CONDITIONING CIRCUIT

Display

Voltage-to-Current

Converter

Potentiometric Output

Isolated Current Output

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951C NOX A

ODEL

NALYZER

IGURE

4-2. A

INLET VENT HOLES

SOLID-STATE COOLER

CASE HEATER

Fan Heater

NALYZER THERMAL SYSTEM

Top View of Anal

PMT

Cooling Fins

Cooler Fan

FRONT PANEL

zer

EXHAUST FAN

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OUTINE SERVICING

WARNING: ELECTRICAL SHOCK HAZARD

Servicing requires access to live parts which can cause death or serious injury. Refer servicing to qualified personnel.

WARNING: INTERNAL ULTRAVIOLET LIGHT HAZARD

Ultraviolet light from the ozone generator can cause permanent eye damage. Do not look directly at the ultraviolet source in ozone generator. Use of ultraviolet filtering glasses is recommended.

Note The photomultiplier tube must not be exposed to ambient light. If the

photomultiplier tube is exposed to light while the power is on, either through a loose fitting on the reaction chamber or any other leak, it will be destroyed. If exposed to ambient light with the power off, the tube will be noisy for some period of time. Unless appropriate precautions are observed, light can strike the tube upon removal of fittings from the reaction chamber.

5.1 SYSTEM CHECKS AND ADJUSTMENTS

The following procedures may be used to determine the cause of unsatisfactory instrument performance, or to make adjustments following replacement of components. If a recorder is available, use it for convenience and maximum accuracy in the various tests.

5.1.1 D

ISPLAY FULLSCALE SPAN ADJUSTMENT

If a recorder is used, and has been properly zeroed, it should agree with the display reading. If not, obtain agreement by adjustment of R20 on the Signal/Control Board (see Figures 3-1, 3-2). If agreement cannot be reached, check the recorder. If the recorder is functioning properly, replace the amplifier board.

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951C NOX A

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NALYZER

5.1.2 O

VERALL SENSITIVITY

Principal factors that determine overall sensitivity of the analyzer are the following: (a) sample flow rate to the reaction chamber, (b) sensitivity of the photomultiplier tube (PMT), and (c) PMT high voltage. If specified fullscale readings are unobtainable by adjustment of the SPAN Control, sensitivity is subnormal. The cause of reduced sensitivity may be in either the flow system (See Section 5.2) or the electronic circuitry (See Section 5.6).

If either the High Voltage Board or the Phototube/Reaction Chamber Assembly has been replaced, a readjustment of the high voltage will probably be required to obtain the correct overall sensitivity. Adjust R30 on the Power Supply Board (see Figures 3-1, 3-3) clockwise to increase (negative) the photomultiplier high voltage and sensitivity, or counterclockwise to decrease (negative) the voltage and sensitivity. The adjustment range is about -650 V to -2100 V for the regulated DC voltage applied to the photomultiplier tube. Nominal setting is -1100 volts. However, the voltage should be adjusted as required for overall system sensitivity.

5.1.3 O

ZONE OUTPUT

To check for adequate output from the ozone lamp, a convenient technique is to calibrate the analyzer on a high level NO standard such as 250 ppm NO at the nominal 4.0 psi internal sample pressure setpoint, and note the reading. The sample pressure setpoint is then sequentially set to pressures of 3.0, 2.0, and 1.0 psi after a stable span gas reading has obtained at the higher pressure setpoint. The span gas value will change as the pressure is changed. The difference in span gas value between two successive sample pressure levels should be approximately the same for the 4.0 to 3.0, 3.0 to 2.0, and 2.0 to 1.0 pressure steps.

If the size of the span gas value difference increases as the sample pressure is lowered, the analyzer output is limited by the amount of ozone production from the lamp and the two additional checks should be made. First, verify that the sample flow (not including bypass) does not exceed the nominal 60 to 80 cc/min, at 4.0 psi internal sample pressure. Second, substitute another lamp to see if the ozone output is increased.

If no other ozone lamp is available, the analyzer sample input pressure may be reduced to the pressure where the ozone limitation is not present. If the lamp output is low and the sample pressure is reduced to restore operation to the condition where ozone limitation is not occurring, some degradation in analyzer response time characteristics may occur.

WARNING: TOXIC GAS HAZARD

Use extreme caution in troubleshooting the ozone generator. Ozone is toxic.

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OUTINE SERVICING

5.1.4 B

ACKGROUND CURRENT

With zero air supplied to rear panel SAMPLE inlet, excessive background current is evidenced by the inability to obtain zero display reading with adjustment of the ZERO Control. If this cannot be accomplished, the cause must be found and corrected. The fault may be in either the electronic circuitry or the sample flow system.

First, establish proper performance of the electronic circuitry. Turn on analyzer power. Verify that ZERO Control and amplifier are functioning properly. Then, check for excessive photomultiplier dark current and/or contamination of the reaction chamber or sample flow system as follows:

5.1.5 E

XCESSIVE PHOTOMULTIPLIER DARK CURRENT

To check, shut off all flow to the ozone generator. Turn off ozone generator. Supply cylinder air to rear panel SAMPLE inlet. Note response on display or recorder. If background is still excessive, possible causes are:

leakage of ambient light to photomultiplier tube

•

defective photomultiplier tube

•

electrical leakage in socket assembly

•

ONTAMINATION OF REACTION CHAMBER OR SAMPLE FLOW SYSTEM

See Section 5.4.1.

5.2 SERVICING FLOW SYSTEM

To facilitate servicing and testing, the Model 951C has front drawer access. Drawing 654090 shows flow system details, including fittings, thread specifications

and connecting tubing.

5.2.1 C

LEANING SAMPLE CAPILLARY

If clogging of sample ca pillary is suspected, measure flo w rate as described below.

1. Turn off instrument power and shut off all gases.

2. Refer to Figures 6-1 and 6-3. Cover and shade the fittings on the reaction chamber with a dark cloth or other light-shielding material. Remove the fitting associated with the sample capillary and place a cap over the open fitting to prevent entry of stray light.

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Note: If the opened fitting is inadvertently exposed to ambient light, the

instrument will temporarily give a highly noisy background reading. If so, this condition may be corrected by leaving the instrument on, with high voltage on, for several hours. If high voltage is on during exposure, the photomultiplier tube will be destroyed.

3. With instrument power off, supply suitable test gas (dry nitrogen or air) to rear-panel SAMPLE inlet.

4. Connect a flowmeter to open end of sample capillary. Adjust internal SAMPLE Pressure Regulator to normal operating setting of 4 psig (28 kPa). Verify that flowmeter indicates appropriate flow of 60 to 80 cc/min.

5. If flow is correct, restore analyzer to normal operation.

6. If flow is low, the capillary requires cleaning or replacement (Proceed with the step 5 below).

7. Clean capillary with denatured alcohol, and purge with dry nitrogen or air f or one minute. Reconnect capillary.

8. With the photomultiplier still covered, slowly insert the free end of the capillary into the corresponding fitting on the reaction chamber. Push the capillary in until it touches bottom against the internal fitting. Then tighten fitting 1/4 turn past finger tight.

Note: Do not overtighten capillary internal fitting, as overtightened fittings may

restrict the sample flow.

5.2.2 O

ZONE RESTRICTOR FITTING

With instrument power off, supply suitable test gas (dry nitrogen or air) to rear panel AIR inlet. Cover photomultiplier housing with a dark cloth. At the fittings on the reaction chamber, disconnect the ozone tube and place a cap over the open fitting to prevent entry of ambient light. Connect a flowmeter to open end of ozone tube. Adjust the OZONE Pressure Regulator so that the OZONE Pressure Gauge indicates normal operating pressure of 20 to 25 psig (138 to 172 kPa). Verify that test flowmeter indicates an appropriate flow of 500 to 600 cc/min for 20 psig.

Subnormal flow indicates clogging in the flow path that supplies air to the ozone generator. This path contains a Restrictor (P/N 655519), consisting of a metal fitting with internal fritted (metal membrane) restrictor to reduce pressure. The fitting is upstream from the inlet port of the ozone generator. If the internal restrictor becomes plugged, the assembly (P/N 655519) must be replaced as it cannot normally be cleaned satisfactorily.

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OUTINE SERVICING

5.3 PHOTOMULTIPLIER TUBE/REACTION CHAMBER

This assembly consists of the photomultiplier tube and socket, the thermoelectric cooler, and the reaction chamber. Refer to Figure 6-1 for location and details of mounting. Refer to Figure 6-3 for information on the assembly.

The assembly must be removed from the analyzer in order to clean the reaction chamber or to replace the photomultiplier tube.

5.3.1 P

HOTOMULTIPLIER TUBE/REACTION CHAMBER REMOVAL

To remove the photomultiplier tube/reaction chamber assembly from the analyzer, do the follow:

1. Disconnect power from the analyzer.

2. Release pressure from SAMPLE and AIR supplies.

3. Unplug the electrical cable from the Power Supply PC Board.

4. Disconnect the high-voltage cable and the signal cable from the left side of the assembly. Note the two mounting screws just below the connectors.

5. Uncouple the sample and ozone capillaries and the exhaust line from the right side of the assembly. Note the two mounting screws just below the fittings.

6. Loosen the screws described in steps 4 and 5 above.

7. Lift the assembly from the analyzer.

8. Replace the assembly by reversing the order of steps 1 through 7.

5.3.2 C

LEANING REACTION CHAMBER

Note: Photomultiplier tube will be permanently damaged if exposed to ambient

light while powered with high voltage. Photomultiplier tube will develop temporary electronic noise if exposed to ambient light with high voltage OFF. A temporary noisy condition may be corrected by leaving instrument on, with high voltage on, for several hours. The required recovery time depends on intensity and duration of the previous exposure. Noise level on the most sensitive range usually drops to normal within 24 hours.

If sample gas is properly filtered, the reaction chamber should not require frequent cleaning. In event of carryover or contamination, however, the chamber should be disassembled to permit cleaning the quartz window and the optical filter. The following procedure is recommended.

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1. Cover and shade the Reaction Chamber/Photomultiplier Assembly with a dark cloth or other light-shielding material.

Note: Always wear surgical rubber gloves when handling the reaction chamber to

prevent contamination from handling.

2. Note the orientation of the fittings. Slowly rotate and withdraw the reaction chamber from the housing. Ensure that no light strikes the photomultiplier tube.

3. Unscrew plastic end cap, thus freeing the quartz window and the red plastic optical filter. Note the sequence in which these are assembled.

4. Clean the reaction chamber by the appropriate one of the following two methods, standard or alternate. The standard method is applicable in most cases. The alternate method is applicable when the instrument has shown high residual fluorescence. That condition is indicated by high residual currents on a zero gas and high differentials between zero gas readings obtained with the ozone lamp on and off.

TANDA RD CLEANING PROCEDURE

Using a stiff plastic bristle brush, such as a toothbrush, scrub the Teflon surface and gas ports of the reaction chamber with clean distilled water and Alconox* detergent (P/N 634929). Alconox detergent is included in the shipping kit provided with the Model 951C NOx Analyzer, and is available from Sargent-Welch Scientific Company under its catalog number S-195650-A.

Using Alconox and clean, soft facial tissue (NOT industrial wipes), carefully clean the quartz window. Vigorously flush reaction chamber and quartz window with clean distilled water. Blow out all possible water from internal passages of reaction chamber. Dry reaction chamber and quartz window in a warm oven at 125°F to 150°F (52°C to 66°C) for 30 to 45 minutes or purge-dry the parts with dry cylinder air or nitrogen to eliminate all moisture.

WARNING: ACID HAZARD

Hydrochloric acid (HC1) is a strong acid. It is irritating to the skin, mucous membranes, eyes and respiratory tract. Direct contact causes severe chemical burns.

Avoid Contact with eyes and skin and avoid breathing fumes. Use in hood or well ventilated place. Wear goggles, rubber gloves and protective clothing.

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OUTINE SERVICING

LTERNATE CLEANING PROCEDURE

OR HIGH RESIDUAL FLUORESCENCE

- F

Holding the reaction chamber by the tube fittings, and using appropriate caution, immerse the white Teflon part of the chamber in 50% concentrated Reagent Grade hydrochloric acid. After five minutes, rinse thoroughly with de-ionized water, then air dry as in the standard cleaning method above.

Place parts in position and press on end-cap so that mating threads engage properly, without cross threading. Turn mating parts in one continuous motion until the parts mesh. Do not over-torque.

With reaction chamber now assembled, replace and reconnect it in reversed removal sequence. Orient as noted in step 2.

5.3.3 P

HOTOMULTIPLIER TUBE AND HOUSING

The photomultiplier tube operates at high DC voltages (nominal setting is -1100 volts) and generates small currents that are highly amplified by the signal-conditioning circuitry. It is therefore important that ambient humidity and condensed water vapor be excluded from the interior of the photomultiplier housing. Ambient humidity can result in electrical leakage, observed as abnormally high dark current. Water vapor or condensed moisture in contact with the photomultiplier tube may result in an abnormally high noise level during instrument readout on zero air or upscale standard gas.

The Photomultiplier Tube/Reaction Chamber Assembly incorporates several features for exclusion of humidity and moisture. The photomultiplier socket assembly is potted with high impedance silicone rubber compound and is sealed from external influences with epoxy and rubber gasket material. The socket assembly and the reaction chamber are sealed with O-rings into opposite ends of the tubular photomultiplier housing. The socket end of the housing may be sealed with either one or two O-rings, depending on the length of the phototube.

5.3.4 R

EPLACEMENT OF PHOTOMULTIPLIER TUBE

The photomultiplier tube assembly must be removed from the housing in order to replace the tube. To remove, do the following:

1. Note the orientation of the connectors.

2. Slowly rotate and withdraw the socket assembly from the housing. Note the orientation and placement of the metal shield and the black plastic insulating cover.

3. Carefully unplug the photomultiplier tube from the socket.

4. Plug a new tube into the socket.

5. Orient the metal shield and black plastic insulator as noted in step 2.

6. Carefully rotate and insert the tube, shield and cover into the housing. Orient as noted in step 1.

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5.4 OZONE GENERATION SYSTEM

WARNING: TOXIC CHEMICAL HAZARD

The ozone generator lamp contains mercury. Lamp breakage could result in mercury exposure. Mercury is highly toxic if absorbed through skin or ingested, or if vapors are inhaled.

Handle lamp assembly with extreme care. If lamp is broken, avoid skin contact and inhalation in the area of the lamp

or the mercury spill. Immediately clean up and dispose of the mercury spill and lamp residue as

follows: Wearing rubber gloves and goggles, collect all droplets of mercury by

means of a suction pump and aspirator bottle with long capillary tube. Alternatively, a commercially available mercury spill clean-up kit, such as J. T. Baker product No. 4439-01, is recommended.

Carefully sweep any remaining mercury and lamp debris into a dust pan. Carefully transfer all mercury, lamp residue and debris into a plastic bottle which can be tightly capped. Label and return to hazardous material reclamation center.

Do not place in trash, incinerate or flush down sewer. Cover any fine droplets of mercury in non-accessible crevices with calcium

polysulfide and sulfur dust.

This system consists of the ultraviolet lamp, lamp housing, and power supply. Refer to Figure 6-1 for location and details of mounting.

5.4.1 L

AMP/HOUSING REMOVAL

To remove the lamp and housing, do the follow:

1. Disconnect power from the instrument.

2. Release pressure from SAMPLE and AIR supplies.

3. Disconnect the air supply tubing from the front of the housing.

4. Disconnect the ozone tube leading to the reaction chamber.

5. Disconnect the power cable from the Power Supply.

6. Uncouple the two Velcro straps which secure the housing to power supply.

7. Lift the housing from the analyzer.

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OUTINE SERVICING

5.4.2 UV L

AMP REPLACEMENT

To replace the lamp, do the following:

1. Unscrew and remove end cap.

2. Unscrew aluminum outer lamp housing tube from lamp base, using care not to hit or touch lamp assembly.

Note: Do not touch lamp. Fingerprints may cause a decrease in lamp output.

1. Replace O-ring in lamp base with new O-ring supplied in kit.

2. Insert replacement lamp assembly using care not to hit or touch lamp housing.

3. Insert new O-ring into new end cap. Screw end cap onto end of lamp housing.

4. Replace the lamp and housing by reversing the steps in this section.

5.4.3 P

OWER SUPPLY REMOVAL

To remove the Power Supply, do the following: Refer to Figure 6-1.

1. Remove the lamp and housing as in Section 5.4.2.

2. Disconnect the power lead from the Power Supply Board.

3. Remove the two screws which secure the Power Supply to the bottom plate of the analyzer.

4. Lift the Power Supply from the analyzer.

5. Replace the Power Supply by reversing the order of the steps in this section.

5.5 CONVERTER ASSEMBLY

To check the heater blanket, verify the continuity of the heater coil. To check the temperature sensor, refer to Section 3.4 and measure its resistance

when instrument power is off (should be about 440 ohms) and when instrument power is on (should range from 800 to 1,000 ohms). See Table 3-1.

To remove the glass converter tube (see Figure 6-4):

1. Carefully disconnect the blue silicon connectors from the ends of the inlet and outlet tubes.

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The inlet tube is partially filled with glass wool and has a larger inside diameter than the outlet tube. Further, the outlet tube and the sample capillary (P/N

615989) connect to the same stainless steel tee.

2. Release the assembly and disconnect the heater and sensor connectors from the temperature control board.

3. Remove the lacing from the heater blanket, and remove the converter tube. Note the position of the temperature sensor and its leads as the aluminum foil is unwrapped.

4. Replace the defective part and reassemble. The temperature sensor should contact the converter tube with the top of the sensor at the midpoint of the converter. Route sensor leads axially to the outer end.

5. Condition the converter as described in Sections 3.4 and 3.5.

5.6 SERVICING ELECTRONIC CIRCUITRY

For troubleshooting the electronic system, refer to Section 4 and the appropriate pictorial diagrams at the back of the manual. The electronic system utilizes printed circuit boards with solid-state components. After a malfunction is traced to a particular board, the recommended procedure is to return it to the factory for repair.

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EPLACEMENT PARTS

The following parts are recommended for routine maintenance and troubleshooting of the Model 951C NOx Analyzer. If the troubleshooting procedures do not resolve the problem, contact your local Rosemount Analytical service office. A list of Rosemount Analytical Service Centers is located in the back of this manual. Figures 6-1 through 65 show locations of components and assemblies.

WARNING: PARTS INTEGRITY

Tampering or unauthorized substitution of components may adversely affect safety of this product. Use only factory documented components for repair.

6.1 CIRCUIT BOARD REPLACEMENT POLICY

In most situations involving a malfunction of a circuit board, it is more practical to replace the board than to attempt isolation and replacement of the individual component. The cost of test and replacement will exceed the cost of a rebuilt assembly from the factory.

The following list does not include individual electronic components. If circumstances necessitate replacement of an individual component which can be identified by inspection or from the schematic diagrams, obtain the replacement component from a local source of supply.

6.2 REPLACEMENT PARTS

OMMON PARTS

Refer to Figure 6-1.

655519 Air Restrictor Fitting 657091 Capacitor Assembly 655166 Capillary, Bypass 655589 Capillary, Sample Hi 623719 Capillary, Sample Lo 654068 Temperature Control Assembly 654070 Converter Assembly

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655303 Exhaust Fan 654052 Fan Assembly 898587 Fuse 3.15 A 902413 Fuse 6.25 A 654390 I/O Assembly 652173 Ozone Generator 658156 Ozone Generator UV Lamp Replacement Kit 655129 Ozone Generator Power Supply 654062 Photomultiplier Assembly 655332 Power Supply Assembly 654085 Pressure Switch 623936 Sample Flow Restrictor 644055 Sample Pressure Gauge 815187 Sample Regulator * 622917 Sensor, Temperature 654050 Signal Board 654878 Transformer/Inductor Assembly

HOTOMULTIPLIER ASSEMBLY

Refer to Figure 6-2.

654943 Housing 649541 Insulating Washer 636318 Magnetic Shield 630916 Magnetic Shield 001522 O-Ring 008423 O-Ring, Photomultiplier 655168 Photomultiplier Tube 654381 Reaction Chamber 654086 Socket Assembly 639722 Thermal Shield

ONVERTER ASSEMBLY

654070

Refer to Figure 6-3.

632784 Connector, Blue Silicone 657127 Heater 632782 Temperature Sensor 632795 Tube

654062

EMPERATURE CONTROL ASSEMBLY

Refer to Figure 6-4.

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622733 Fan 622732 Heater 655335 Temperature Control Board 900492 Thermal Fuse

Power Supply Assembly 655332

Case Heater Temperature Control Assembly 654068 (See Figure 6-4)

Photomultiplier Assembly 654062 (See Figure 6-2)

I/O Assembly 654390

Transformer/Inductor Assembly 654878

EPLACEMENT PARTS

Sample Flow Restrictor 623936

Exhaust Fan 655303

Fan Assembly 654052

Pressure Switch 654085

IGURE

748214-N

6-1. M

Air Restrictor 655519 (on Ozone Generator inlet)

Ozone Generator Power Supply

Sample Regulator 815187

Sample Pressure Gauge 644055

655129

AJOR ASSEMBLIES OF THE MODEL

Ozone Generator 658156

UV Lamp Replacement Kit 658156 Sensor 622917

951C

September 1997

Converter Assembly 654070 (See Figure 6-3)

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Magnetic Shield 636318

NALYZER

Socket Assembly 654086

O-Rings 001522

Thermocooler Housing 654943

PVC Tube

Photomultiplier Tube 655168

Insulating Washer 649541

Thermal Shield 639722

O-Ring 008423

Reaction Chamber 654381

Magnetic Shield 630916

Photomultiplier Tube

Magnetic Shield 630916

Photomultiplier Tube and Magnetic Shield (PN 630916) to be Flush

Note: Silicone lubricant to be applied to o-rings.

IGURE

6-4

6-2. P

Rosemount Analytical

HOTOMULTIPLIER HOUSING ASSEMBLY

September 1997

PVC Tube

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Connectors, Glass Tube

Temperature Sensor 632782

EPLACEMENT PARTS

IGURE

6-3. C

Converter Tube - Packed 632795

Heater 657127

ONVERTER ASSEMBLY

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Temperature Control Board 655335

Thermal Fuse 900492

IGURE

6-4. C

Heater Cable Orientation

Fan 622733

Heater 633732

ASE HEATER TEMPERATURE CONTROL ASSEMBLY

6-6

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ENERAL PRECAUTIONS FOR HANDLING AND

TORING 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.

4125 E

AST LA PALMA AVENUE

Rosemount Analytical Inc.

• A J

ULY

, C

NAHEIM

ALIFORNIA

1997 • 748525-C • P

92807-1802 • 714-986-7600 • FAX 714-577-8006

RINTED IN

USA

Page 56

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ARRANTY

Goods and part(s) (excluding consumables) manufactured by Seller are warranted to be free from defects in workmanship and material under normal use and service for a period of twelve (12) months from the date of shipment by Seller. Consumables, glass electrodes, membranes, liquid junctions, electrolyte, o-rings, etc., are warranted to be free from defects in workmanship and material under normal use and service for a period of ninety (90) days from date of shipment by Seller. Goods, part(s) and consumables proven by Seller to be defective in workmanship and/or material shall be replaced or repaired, free of charge, F.O.B. Seller's factory provided that the goods, part(s) or consumables are returned to Seller's designated factory, transportation charges prepaid, within the twelve (12) month period of warranty in the case of goods and part(s), and in the case of consumables, within the ninety (90) day period of warranty. This warranty shall be in effect for replacement or repaired goods, part(s) and the remaining portion of the ninety (90) day warranty in the case of consumables. A defect in goods, part(s) and consumables of the commercial unit shall not operate to condemn such commercial unit when such goods, part(s) and consumables are capable of being renewed, repaired or replaced.

The Seller shall not be liable to the Buyer, or to any other person, for the loss or damage directly or indirectly, arising from the use of the equipment or goods, from breach of any warranty, or from any other cause. All other warranties, expressed or implied are hereby excluded.

IN CONSIDERATION OF THE HEREIN STATED PURCHASE PRICE OF THE GOODS, SELLER GRANTS ONLY THE ABOVE STATED EXPRESS WARRANTY. NO OTHER W ARRANTIES ARE GRANTED INCLUDING, BUT NOT LIMITED TO, EXPRESS AND IMPLIED WARRANTIES OR MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

Limitations of Remedy. SELLER SHALL NOT BE LIABLE FOR DAMAGES CAUSED BY DELAY IN PERFORMANCE. THE SOLE AND EXCLUSIVE REMEDY FOR BREACH OF WARRANTY SHALL BE LIMITED TO REPAIR OR REPLACEMENT UNDER THE STANDARD W ARRANTY CLAUSE. IN NO CASE, REGARDLESS OF THE FORM OF THE CAUSE OF ACTION, SHALL SELLER'S LIABILITY EXCEED THE PRICE TO BUYER OF THE SPECIFIC GOODS MANUFACTURED BY SELLER GIVING RISE TO THE CAUSE OF ACTION. BUYER AGREES THAT IN NO EVENT SHALL SELLER'S LIABILITY EXTEND TO INCLUDE INCIDENTAL OR CONSEQUENTIAL DAMAGES. CONSEQUENTIAL DAMAGES SHALL INCLUDE, BUT ARE NOT LIMITED TO, LOSS OF ANTICIPATED PROFITS, LOSS OF USE, LOSS OF REVENUE, COST OF CAPITAL AND DAMAGE OR LOSS OF OTHER PROPERTY OR EQUIPMENT. IN NO EVENT SHALL SELLER BE OBLIGATED TO INDEMNIFY BUYER IN ANY MANNER NOR SHALL SELLER BE LIABLE FOR PROPERTY DAMAGE AND/OR THIRD PARTY CLAIMS COVERED BY UMBRELLA INSURANCE AND/OR INDEMNITY COVERAGE PROVIDED TO BUYER, ITS ASSIGNS, AND EACH SUCCESSOR INTEREST TO THE GOODS PROVIDED HEREUNDER.

Force Majeure. Seller shall not be liable for failure to perform due to labor strikes or acts beyond Seller's direct control.

Rosemount Analytical

4125 E

AST LA PALMA AVENUE

Rosemount Analytical Inc.

• A

EBRUARY 1997 • 7485189-C • PRINTED IN USA

NAHEIM

, C

ALIFORNIA

92807-1802 • 714-986-7600 • FAX 714-577-8006

Page 58

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Page 59

IELD SERVICE AND REPAIR FACILITIES

Field service and repair facilities are located worldwide.

U.S.A.

To obtain field service on-site or assistance with a service problem, contact (24 hours, 7 days a week):

National Response Center

1-800-654-7768

INTERNATIONAL

Contact your local Rosemount Sales and Service office for service support.

FACTORY

For order administration, replacement Parts, application assistance, on-site or factory repair, service or maintenance contract information, contact:

Rosemount Analytical Inc.

Process Analytical Division

Customer Service Center

1-800-433-6076

RETURNING PARTS TO THE FACTORY

Before returning parts, contact the Customer Service Center and request a Returned Materials Authorization (RMA) number. Please have the following information when you call:

Model Number, Serial Number, and Purchase Order Number or Sales Order Number.

Prior authorization by the factory must be obtained before returned materials will be accepted. Unauthorized returns will be returned to the sende r, f re ight collect.

When return ing any product or compon ent that has been expo sed to a toxic, co rrosive or other hazardous material or used in such a hazardous environment, the user must attach an appropriate Material Safety Data Sheet (M.S.D.S.) or a written certification that the material has been decontaminated, disinfected and/or detoxified.

Return to:

Rosemount Analytical Inc.

4125 East La Palma Avenue

Anaheim, California 92807-1802

4125 E

AST LA PALMA AVENUE

Rosemount Analytical Inc.

• A J

, C

NAHEIM

ULY 1997 • 748190-G • PRINTED IN USA

ALIFORNIA

92807-1802 • 714-986-7600 • FAX 714-577-8006

Page 60

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Rosemount 951C NOx Analyzer-Rev N Manuals & Guides

Specifications and Main Features

Frequently Asked Questions

User Manual