Rosemount 951C Instruction Manual
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Rosemount 951C Instruction Manual

Nox analyzer
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Rosemount Analytical
M
951C
ODEL
NO
A
X
NALYZER
I
M
NSTRUCTION
ANUAL
748214-P

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Summary of Contents for Rosemount 951C

  • Page 1 Rosemount Analytical 951C ODEL NALYZER NSTRUCTION ANUAL 748214-P...
  • Page 2 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-P December 2000 Printed in U.S.A. Rosemount Analytical Inc. 4125 East La Palma Avenue 92807-1802 NAHEIM ALIFORNIA...

  • Page 3: Table Of Contents

    2.2 LOCATION ....................3 2.3 VOLTAGE REQUIREMENTS..............3 2.4 ELECTRICAL CONNECTIONS ..............4 2.4.1 Line Power Connections ..............4 2.4.2 Potentiometric Recorder Connections ...........6 2.4.3 Current Recorder Connections ............6 2.5 GAS REQUIREMENTS ................7 2.6 SAMPLE REQUIREMENTS ................8 748214-P Rosemount Analytical December 2000 Model 951C NOx Analyzer...
  • Page 4 5.1.2 Overall Sensitivity ................26 5.1.3 Ozone Output ................26 5.1.4 Background Current ..............27 5.1.5 Excessive Photomultiplier Dark Current ........27 5.2 SERVICING FLOW SYSTEM ..............28 5.2.1 Cleaning Sample Capillary ............28 Model 951C NOx Analyzer December 2000 Rosemount Analytical 748214-P...
  • Page 5 2-1. Power Supply Board Voltage Select Switches ...........5 2-2. Temperature Control Board................5 2-3. Cable Gland ....................6 2-4. Rear View of Model 951C................7 3-1. Model 951C Controls, Indicators and Adjustments ........11 3-2. Signal Board....................14 3-3. Power Supply Board...................15 4-1. Analyzer Signal Conditioning Circuit............23 4-2.
  • Page 6 ONTENTS ABLES 3-1. Resistance of Converter Temperature Sensor vs. Temperature ......18 RAWINGS LOCATED IN REAR OF MANUAL 654063 Installation Drawing 654090 Flow Diagram, Low Range 654093 Flow Diagram, High Range Model 951C NOx Analyzer December 2000 Rosemount Analytical 748214-P...

  • Page 7: Preface

    To avoid explosion, loss of life, personal injury and damage to this equipment and on-site property, all personnel authorized to install, operate and service the Model 951C NOx Analyzer should be thoroughly familiar with and strictly follow the instructions in this manual. Save these instructions.
  • Page 8 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. Model 951C NOx Analyzer December 2000 Rosemount Analytical 748214-P...
  • Page 9 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. 748214-P Rosemount Analytical December 2000 Model 951C NOx Analyzer...

  • Page 10: Specifications - Lo Range

    8.7 in. x 19.0 x 19.0 in. (H x W x D) 22.0 cm x 48.3 cm x 48.3 cm (H x W x D) EIGHT 22.2 kg (49 lbs) approximate Model 951C NOx Analyzer December 2000 Rosemount Analytical 748214-P...

  • Page 11: Specifications - Hi Range

    8.7 in. x 19.0 x 19.0 in. (H x W x D) 22.0 cm x 48.3 cm x 48.3 cm (H x W x D) EIGHT 22.2 kg (49 lbs) approximate 748214-P Rosemount Analytical December 2000 Model 951C NOx Analyzer...

  • Page 12: Customer Service, Technical Assistance And Field Service

    Technical Services Department at: Rosemount Analytical Inc. Phone: 1-714-986-7600 FAX: 1-714-577-8006 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) Model 951C NOx Analyzer...

  • Page 13: Compliances

    REFACE OMPLIANCES This product satisfies all obligations of all relevant standards of the EMC framework in Australia and New Zealand. N 96 748214-P Rosemount Analytical December 2000 Model 951C NOx Analyzer...
  • Page 14 REFACE OTES Model 951C NOx Analyzer December 2000 Rosemount Analytical 748214-P...
  • Page 15 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. Establish correct pressure of upscale standard gas: 748214-P Rosemount Analytical December 2000 Model 951C NOx Analyzer...

  • Page 16: Condensed Startup And Calibration Procedure

    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. Model 951C NOx Analyzer December 2000 Rosemount Analytical 748214-P...

  • Page 17: Introduction

    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.

  • Page 18: Applications

    NTRODUCTION 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 •...

  • Page 19: Installation

    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. 748214-P Rosemount Analytical December 2000 Model 951C NOx Analyzer...

  • Page 20: Electrical Connections

    • 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. Model 951C NOx Analyzer December 2000 Rosemount Analytical 748214-P...

  • Page 21: Power Supply Board Voltage Select Switches

    LINE SUPPLY R17 R16 R12 CR2 C2 R10 R11 R7 R8 R9 R5 T.I.F. HEATER TEST TEMP CONTROL BD Set switch window for voltage required. 2-2. T IGURE EMPERATURE ONTROL OARD 748214-P Rosemount Analytical December 2000 Model 951C NOx Analyzer...

  • Page 22: Potentiometric Recorder Connections

    Zero the instrument as in Section 3.4. Adjust R23, the zero-adjust potentiometer on the Power Supply Board, to produce 0 mA current output. INTERIOR EXTERIOR Gland Cable Case Wall 2-3. C IGURE ABLE LAND Model 951C NOx Analyzer December 2000 Rosemount Analytical 748214-P...

  • Page 23: Gas Requirements

    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. 748214-P Rosemount Analytical December 2000 Model 951C NOx Analyzer...

  • Page 24: Sample Requirements

    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...

  • Page 25: Leak Test

    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. 748214-P Rosemount Analytical December 2000 Model 951C NOx Analyzer...
  • Page 26 NSTALLATION OTES Model 951C NOx Analyzer December 2000 Rosemount Analytical 748214-P...

  • Page 27: Initial Tartup And

    ANGE ELECTION 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 desired range controlling the recorder output.

  • Page 28: Sample Pressure Gauge

    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. Model 951C NOx Analyzer December 2000 Rosemount Analytical...

  • Page 29: Startup Procedure

    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. 748214-P Rosemount Analytical December 2000 Model 951C NOx Analyzer...

  • Page 30: Signal Board

    CR10 CR14 CR11 R32 R33 C9 C5 R14 R12 CR23 SPAN ZERO R101 R100 654050 SIGNAL CONTROL BD R101 - SPAN Potentiometer R100 - ZERO Potentiometer 3-2. S IGURE IGNAL OARD Model 951C NOx Analyzer December 2000 Rosemount Analytical 748214-P...

  • Page 31: Power Supply Board

    230V CR10 R37 CR11 115V 115V 115V 115V 115V 115V CR16 CR17 655340 POWER SUPPLY BD 230V 230V 230V 115V 115V 115V 115V 115V 115V 3-3. P IGURE OWER UPPLY OARD 748214-P Rosemount Analytical December 2000 Model 951C NOx Analyzer...

  • Page 32: Calibration

    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.

  • Page 33: Converter Temperature Adjustment Procedure

    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.
  • Page 34 (Ohms) 1008 1084 3-1. R ABLE ESISTANCE OF ONVERTER EMPERATURE ENSOR VS EMPERATURE Note Converter temperature is not a direct measure of converter efficiency. Temperature measurement is for reference purposes only. Model 951C NOx Analyzer December 2000 Rosemount Analytical 748214-P...

  • Page 35: Measurement Of Converter Efficiency

    748214-P Rosemount Analytical December 2000 Model 951C NOx Analyzer...

  • Page 36: Recommended Calibration Frequency

    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. Model 951C NOx Analyzer December 2000 Rosemount Analytical 748214-P...

  • Page 37: Nitric Oxide Determination By Chemiluminescence

    SAMPLE inlet. 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 748214-P Rosemount Analytical December 2000 Model 951C NOx Analyzer...

  • Page 38: Ozone Generation

    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. Model 951C NOx Analyzer December 2000 Rosemount Analytical 748214-P...

  • Page 39: Analyzer Thermal System

    Tube Gain Amplifier Amplifier Amplifier Potentiometric Output Zero Control Range Switch Span Control Power Supply Board Voltage-to-Current Converter Isolated High Voltage Current Supply Output 4-1. A IGURE NALYZER IGNAL ONDITIONING IRCUIT 748214-P Rosemount Analytical December 2000 Model 951C NOx Analyzer...

  • Page 40: Analyzer Thermal System

    HEORY INLET VENT HOLES Top View of Analyzer EXHAUST FAN SOLID-STATE COOLER Cooling Fins CASE HEATER Cooler Fan Heater FRONT PANEL 4-2. A IGURE NALYZER HERMAL YSTEM Model 951C NOx Analyzer December 2000 Rosemount Analytical 748214-P...

  • Page 41: Routine Servicing

    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. 748214-P Rosemount Analytical December 2000 Model 951C NOx Analyzer...

  • Page 42: Overall Sensitivity

    WARNING: TOXIC GAS HAZARD Use extreme caution in troubleshooting the ozone generator. Ozone is toxic. Model 951C NOx Analyzer December 2000 Rosemount Analytical 748214-P...

  • Page 43: Background Current

    • leakage of ambient light to photomultiplier tube • defective photomultiplier tube • electrical leakage in socket assembly ONTAMINATION OF EACTION HAMBER OR AMPLE YSTEM See Section 5.4.1. 748214-P Rosemount Analytical December 2000 Model 951C NOx Analyzer...

  • Page 44: Servicing Flow System

    OUTINE ERVICING 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 AMPLE APILLARY If clogging of sample capillary is suspected, measure flow rate as described below.

  • Page 45: Ozone Restrictor Fitting

    (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. 748214-P Rosemount Analytical December 2000 Model 951C NOx Analyzer...

  • Page 46: Photomultiplier Tube/Reaction Chamber

    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. Model 951C NOx Analyzer December 2000 Rosemount Analytical 748214-P...
  • Page 47 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.

  • Page 48: Photomultiplier Tube And Housing

    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. Model 951C NOx Analyzer December 2000 Rosemount Analytical...

  • Page 49: Ozone Generation System

    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. 748214-P Rosemount Analytical December 2000 Model 951C NOx Analyzer...

  • Page 50: Uv Lamp Replacement

    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. Model 951C NOx Analyzer December 2000 Rosemount Analytical 748214-P...

  • Page 51: Converter Assembly

    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. 748214-P Rosemount Analytical December 2000 Model 951C NOx Analyzer...
  • Page 52 OUTINE ERVICING OTES Model 951C NOx Analyzer December 2000 Rosemount Analytical 748214-P...

  • Page 53: Replacement

    ARTS 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 6-5 show locations of components and assemblies.
  • Page 54 O-Ring, Photomultiplier 655168 Photomultiplier Tube 654381 Reaction Chamber 654086 Socket Assembly 639722 Thermal Shield 654070 ONVERTER SSEMBLY Refer to Figure 6-3. 632784 Connector, Blue Silicone 657127 Heater 632782 Temperature Sensor 632795 Tube Model 951C NOx Analyzer December 2000 Rosemount Analytical 748214-P...

  • Page 55: Major Assemblies Of The Model 951C

    Air Restrictor Pressure Switch 655519 (on Ozone Generator inlet) 654085 Ozone Generator Power Supply 655129 Sample Regulator 815187 Sample Pressure Gauge 644055 6-1. M 951C IGURE AJOR SSEMBLIES OF THE ODEL 748214-P Rosemount Analytical December 2000 Model 951C NOx Analyzer...

  • Page 56: Photomultiplier Housing Assembly

    Magnetic Shield 630916 Photomultiplier Tube PVC Tube Photomultiplier Tube and Magnetic Shield (PN 630916) to be Flush Note: Silicone lubricant to be applied to o-rings. 6-2. P IGURE HOTOMULTIPLIER OUSING SSEMBLY Model 951C NOx Analyzer December 2000 Rosemount Analytical 748214-P...

  • Page 57: Converter Assembly

    EPLACEMENT ARTS Temperature Sensor 632782 Connectors, Glass Tube 632784 Converter Tube - Packed 632795 Heater 657127 6-3. C IGURE ONVERTER SSEMBLY 748214-P Rosemount Analytical December 2000 Model 951C NOx Analyzer...

  • Page 58: Case Heater Temperature Control Assembly

    EPLACEMENT ARTS Temperature Control Board 655335 Thermal Fuse 900492 Heater Cable Orientation 622733 Heater 633732 6-4. C IGURE EATER EMPERATURE ONTROL SSEMBLY Model 951C NOx Analyzer December 2000 Rosemount Analytical 748214-P...

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