WET NOX SAMPLE CONVERSION MODULE

Transcription

1 NGA 2000 WET NOX SAMPLE CONVERSION MODULE AND WET CLD ANALYZER MODULE Rosemount Analytical H

2 NOTICE The information contained in this document is subject to change without notice. Rosemount Analytical's system of NGA 2000 Modular Gas Analyzers and Controllers are patented, under U.S. Patent Teflon is a registered trademark of E.I. dupont de Nemours and Co., Inc. Kynar is a registered trademark of Atochem North America, Inc. Manual Part Number H August 1999 Printed in U.S.A. Rosemount Analytical Inc East La Palma Avenue Anaheim, California

3 CONTENTS PREFACE INTENDED USE STATEMENT...P1 SAFETY SUMMARY...P1 GLOSSARY...P5 WET NOX CONVERSION MODULE...P7 Specifications - Performance...P7 Specifications - Sample...P7 Specifications - Physical...P8 Specifications - Gas Connections...P8 WET CLD ANALYZER MODULE...P9 Specifications - Performance...P9 Specifications - Sample...P10 Specifications - Physical...P10 Specifications - Gas Connections...P10 CUSTOMER SERVICE, TECHNICAL ASSISTANCE AND FIELD SERVICE...P11 RETURNING PARTS TO THE FACTORY...P11 TRAINING...P11 DOCUMENTATION...P11 COMPLIANCES...P12 SECTION 1. INTRODUCTION 1.1 OVERVIEW TYPICAL APPLICATIONS H Rosemount Analytical August 1999 WNX Sample Conversion Module/WCLD Analyzer Module i

4 CONTENTS SECTION 2. INSTALLATION 2.1 UNPACKING MODIFICATION OF A CONVENTIONAL CLD FOR USE IN A WNX SYSTEM ASSEMBLY LOCATION GASES Overview Pneumatic Connections Specifications ELECTRICAL CONNECTIONS SECTION 3. STARTUP AND OPERATION 3.1 OVERVIEW DISPLAYS Run Mode Display Menu Displays Help Displays STARTUP PROCEDURE Warm-up of the WNX Module Warm-up of the WCLD Module BINDING CALIBRATION CONVERTER TEMPERATURE ADJUSTMENT PROCEDURE MEASUREMENT OF CONVERTER EFFICIENCY Test Setup for Measurement of Conversion Efficiency Test Procedure Subnormal Conversion Efficiency Replacement of Converter ROUTINE OPERATION ii WNX Sample Conversion Module/WCLD Analyzer Module August 1999 Rosemount Analytical H

5 CONTENTS SECTION 4. WET NOX - MAINTENANCE AND TROUBLESHOOTING 4.1 POWER FUSE PERISTALTIC PUMP Peristaltic Pump - Replacement Replacing Peristaltic Pump Tube OVEN COMPONENTS Converter Thermostat Manifold Thermistor and Case Thermistor Temperature Sensor Converter Converter Components Oven Fan Regulator/Manifold Assembly Heaters Needle Valve Flow Restrictor Solenoid Valve LON/POWER MODULE POWER MODULE ELECTRONICS ASSEMBLY Computer Board Module Function Board EXHAUST FAN Exhaust Fan Screen INTAKE FAN DEHUMIDIFIER H Rosemount Analytical August 1999 WNX Sample Conversion Module/WCLD Analyzer Module iii

6 CONTENTS SECTION 5. WET CLD MAINTENANCE AND TROUBLESHOOTING 5.1 POWER FUSE REPLACEMENT FANS Fan Replacement Cleaning EMI Filters TRANSISTOR ASSEMBLY REPLACEMENT OZONE GENERATOR Preventive Maintenance Replacing OZONE GENERATOR POWER SUPPLY REPLACEMENT REPLACING PRINTED CIRCUIT BOARDS Computer Board Signal Board Driver Board POWER SUPPLY BOARD LON/Power Module PROM PRESSURE SWITCH REPLACEMENT DETECTOR Removing Detector from Analyzer Module Replacing Detector Components Heater/Thermostat Assembly Reaction Chamber Sapphire Window Photodiode Thermistor Sample Capillary VENT AND PUMP CAPILLARIES SAMPLE AND OZONE PRESSURE SENSORS SECTION 6. REPLACEMENT PARTS 6.1 WET NOX - REPLACEMENT PARTS WET NOX WCLD - REPLACEMENT PARTS SECTION A. WNX/WCLD IDENTIFICATION MATRIX iv WNX Sample Conversion Module/WCLD Analyzer Module August 1999 Rosemount Analytical H

7 CONTENTS GENERAL PRECAUTIONS FOR STORING AND HANDLING HIGH PRESSURE GAS CYLINDERS WARRANTY FIELD SERVICE AND REPAIR FACILITIES FIGURES 1-1. WNX Module Flow System WNX Sample Conversion Module - Top View WNX- Associated WCLD Module Flow Diagram WNX-Associated WCLD Module - Top View Rear Panel Connections of the WNX Module Rear Panel Connections of the WCLD Module WNX Intake Fan Location Electrical Connections Outline and Mounting Dimensions of WNX Module Outline and Mounting Dimensions of WCLD Module Wiring Diagram of WNX Module Wiring Diagram of WCLD Module Run Mode Display Main Menu Display Expert Controls and Setup Menu Display Technical Configuration Menu Technical Help Screen Display Screens Display Screens (1 of 5) Display Screens (2 of 5) Display Screens (3 of 5) Display Screens (4 of 5) Display Screens (5 of 5) Measuring Efficiency of NO2 to NO Converter Conversion Efficiency of Converter Temperature WNX Front Panel Components WNX - Removing Module Cover WNX - Replacing Peristaltic Pump WNX - Replacing Peristaltic Pump Tube WNX - Removing Converter Thermostat, Manifold Thermistor Temperature Sensor and Converter WNX - Converter Assembly WNX - Removal of Oven Fan WNX - Removing Rear Panel WNX -Removing Regulator/Manifold Assembly WNX - Regulator/Manifold Assembly WNX - Removing LON/Power Module, Power Module and Electronics Assembly H Rosemount Analytical August 1999 WNX Sample Conversion Module/WCLD Analyzer Module v

8 CONTENTS FIGURES (CONTINUED) WNX - Electronics Assembly Exploded View WNX - Removal of Exhaust Fan and Screen WNX - Removal of Intake Fan WNX - Removal of Dehumidifier WCLD - Power Fuse Location WCLD - Removing Module Cover WCLD - Removal of Intake and Exhaust Fans WCLD REMOVAL OF OZONE GENERATOR, OZONE GENERATOR POWER SUPPLY, AND TRANSISTOR ASSEMBLY WCLD - Removing Computer Board and Bracket From Analyzer Module WCLD Removing Computer Board From Bracket WCLD REMOVING SIGNAL BOARD, DRIVER BOARD WCLD - Removing Power Supply/LON Assembly from Analyzer... Module WCLD - Power Supply Board/LON Power Module Assembly WCLD - PROM Location on Computer Board WCLD - Removing Pressure Switch and Detector from Analyzer Module WCLD Detector: Cutaway View WCLD - Removing Heater Thermostat Assembly from Detector WCLD - Removing Reaction Chamber and Sapphire Window from Detector WCLD - Removing the Photodiode from the Detector WCLD - Photodiode/Socket: Exploded View WCLD - Capillary Assembly WCLD - Removing the Sample Capillary from the Detector WCLD - Replacing Pressure Sensors vi WNX Sample Conversion Module/WCLD Analyzer Module August 1999 Rosemount Analytical H

9 PREFACE INTENDED USE STATEMENT The purpose of this manual is to provide information concerning the components, functions, installation and maintenance of this particular NGA 2000 module. Some sections may describe equipment not used in your configuration. The user should become thoroughly familiar with the operation of this module before operating it. Read this instruction manual completely. SAFETY SUMMARY To avoid explosion, loss of life, personal injury and damage to this equipment and onsite property, all personnel authorized to install, operate and service this equipment should be thoroughly familiar with and strictly follow the instructions in this manual. Save these instructions. If this equipment is used in a manner not specified in these instructions, protective systems may be impaired. DANGER is used to indicate the presence of a hazard which will cause severe personal injury, death, or substantial property damage if the warning is ignored WARNING is used to indicate the presence of a hazard which can cause severe personal injury, death, or substantial property damage if the warning is ignored. CAUTION is used to indicate the presence of a hazard which will or can cause minor personal injury or property damage if the warning is ignored. NOTE is used to indicate installation, operation, or maintenance information which is important but not hazard-related. CAUTION: PARTS INTEGRITY Tampering or unauthorized substitution of components may adversely affect safety of this product. Use only factory documented components for repair H Rosemount Analytical August 1999 WNX Sample Conversion Module/WCLD Analyzer Module P1

10 PREFACE WARNING: HIGH PRESSURE GAS CYLINDERS This analyzer requires use of pressurized gas. See General Precautions for Handling and Storing High Pressure Cylinders, in the rear of this manual. CAUTION: OVERBALANCE HAZARD This module may tip instrument over if it is pulled out too far and the Platform is not properly supported. WARNING: TOXIC AND OXIDIZING GAS This module 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 module's 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 module, and avoid inhalation of the sample and exhaust products transported within the module. Avoid inhalation of the combined exhaust products at the exhaust fitting. Keep all tube fittings tight to avoid leaks. See section for leak test information. Connect rear exhaust outlet to outside vent with stainless steel or Teflon* line. Check vent line and connections for leakage. P2 WNX Sample Conversion Module/WCLD Analyzer Module August 1999 Rosemount Analytical H

11 PREFACE WARNING: INTERNAL ULTRAVIOLET LIGHT This device generates ultraviolet light which can cause permanent eye damage. Remove power from the instrument before opening ozonator housing. The ozone generator lamp contains mercury. Lamp breakage could result in mercury exposure. Mercury is highly toxic if absorbed through the skin or ingested, or if vapors are inhaled. Handle lamp assembly with extreme care. If the 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 a long capillary tube. (Alternatively, a commercially available mercury spill clean-up kit, such as J.T. Baker product No , 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 the trash, incinerate or flush down the sewer. - Cover any fine droplets of mercury in non-accessible crevices with calcium polysulfide and sulfur dust H Rosemount Analytical August 1999 WNX Sample Conversion Module/WCLD Analyzer Module P3

12 PREFACE NOTES P4 WNX Sample Conversion Module/WCLD Analyzer Module August 1999 Rosemount Analytical H

13 PREFACE GLOSSARY ANALYZER MODULE The module that contains all sensor/detector components for development of a Primary Variable signal; includes all signal conditioning and temperature control circuitry. BACKPLANE The interconnect circuit board which the Controller Board, Power Supply, Analyzer Module power and network cables, I/O Modules and Expansion Modules plug into. CONTROL MODULE The Operator Interface plus the Controller Board. CONTROLLER BOARD The computer board that serves as the Network Manager and operates the Display and Keypad. DISTRIBUTION ASSEMBLY The Backplane and the card cages that hold I/O and Expansion Modules. EXPANSION MODULE A circuit board that plugs into the Backplane from the front of the Platform and performs special features not related to I/O functions. I/O MODULE A circuit board that plugs into the Backplane from the rear of the Platform. Has a connector terminal for communication with external data acquisition devices and provides an input/output function. OPERATOR INTERFACE The Display and Keyboard. PLATFORM Any workable collection of the following: Controller Board, Power Supply, Distribution Assembly, Enclosure and Operator Interface. POWER SUPPLY Any of a variety of components that provides conditioned power to other NGA 2000 components, from the Power Supply Board that plugs into the front of the Backplane in a stand-alone instrument to several larger ones that can power larger collections of modules and components H Rosemount Analytical August 1999 WNX Sample Conversion Module/WCLD Analyzer Module P5

14 PREFACE PRIMARY VARIABLE The measured species concentration value from an Analyzer Module. SECONDARY VARIABLE Data placed on the network by a module regarding current status, e.g., sample flow, source voltage and other diagnostic information. SOFTKEYS The five function keys located below the front panel display; they assume the function displayed directly above each on the display, a function dictated by software. SYSTEM Any collection of Analyzer Module(s), Platform(s), I/O Module(s) and Expansion Module(s). P6 WNX Sample Conversion Module/WCLD Analyzer Module August 1999 Rosemount Analytical H

15 PREFACE WET NOX CONVERSION MODULE SPECIFICATIONS - PERFORMANCE MEASUREMENT SPECIES NO, NOx RANGES 0 to 10 ppm through 0 to 10,000 ppm; 500 ppm NOx maximum DELAY TIME 5 seconds, maximum (Does not include response time of companion CLD) AMBIENT TEMPERATURE 10 to 40 C POWER 24 V DC 192 W FOR THE FOLLOWING PARAMETERS, THE WET NOX SAMPLE CONDITIONING MODULE AND THE WET CLD ANALYZER MODULE TOGETHER SHALL MEET THE PERFORMANCE SPECIFICATIONS OF THE COMPANION CLD MODULE. Repeatability Minimum Detectable Level Noise Linearity Response Time Drift Effect of Temperature SPECIFICATIONS - SAMPLE TEMPERATURE 70 C or less FLOW RATE 750 to 2000 ml/min. PRESSURE 344 to 620 hpa (5 to 9 psig) PARTICLES Filtered to <2 microns MOISTURE less than 15% water vapor by volume, no entrained liquid MATERIALS IN CONTACT WITH SAMPLE Stainless steel, glass, Teflon H Rosemount Analytical August 1999 WNX Sample Conversion Module/WCLD Analyzer Module P7

16 PREFACE SPECIFICATIONS - PHYSICAL CASE CLASSIFICATION General purpose for installation in weather-protected area MAXIMUM LENGTH OF LON CABLE 1600m (1 mile) DIMENSIONS 109mm H x 213mm W x 572mm D (4.4 H x 8.4 W x 24.8 D) WEIGHT 10.6 kg (23.5 lbs) MOUNTING Custom-installed in a panel (not used in a platform) SPECIFICATIONS - GAS CONNECTIONS SAMPLE IN 1/4 O.D. tube fitting, stainless steel EXHAUST GAS 1/4 O.D. tube fitting, stainless steel SAMPLE OUT 1/8 O.D. tube fitting, stainless steel EXHAUST LIQUID 1/4 O.D. tube fitting, stainless steel P8 WNX Sample Conversion Module/WCLD Analyzer Module August 1999 Rosemount Analytical H

17 PREFACE WET CLD ANALYZER MODULE SPECIFICATIONS - PERFORMANCE See the Preface section of the Platform Components manual for specifications regarding Platform-related components (e.g., case dimensions) and the Preface of the I/O Module manual for specifications regarding I/O (e.g., relay outputs). MEASUREMENT SPECIES NO RANGES 0 to 10 ppm through 0 to 10,000 ppm; 500 ppm NO REPEATABILITY ±0.5% of fullscale (at constant temperature) MINIMUM DETECTABLE LEVEL 0.1 ppm NOISE <1% of fullscale, peak to peak LINEARITY ±1% of fullscale RESPONSE TIME <1 sec. for 90% of fullscale for ranges of 25 ppm or greater <3 sec. for 90% of fullscale for ranges of less than 25 ppm (Does not include delay time introduced by Wet NOx Conversion Module) DRIFT (AT CONSTANT TEMPERATURE) Zero - ±1% of fullscale/24 hours, <2% of fullscale/week Span - <±1% of fullscale/24 hours, <3% of fullscale/week EFFECT OF TEMPERATURE <2% of fullscale (over any 10 C ambient temperature variation interval for a rate of change no greater than 10 C/hour) AMBIENT TEMPERATURE 10 C to 40 C (50 F to 104 F) POWER 24V DC 70W H Rosemount Analytical August 1999 WNX Sample Conversion Module/WCLD Analyzer Module P9

18 PREFACE SPECIFICATIONS - SAMPLE TEMPERATURE 0 C to 55 C (32 F to 131 F) FLOW RATE Approximately 400 ml/min. PRESSURE 482 hpa (±138 hpa), 7 psig (±2 psig) PARTICLES Filtered to <2 microns DEWPOINT 5.5 C below ambient temperature, no entrained liquid MATERIALS IN CONTACT WITH SAMPLE Stainless steel, glass, Teflon, Kynar OZONATOR GAS Clean, dry air or oxygen; flow rate: 1 L/min. maximum pressure: 1702 hpa to 2047 hpa (10 to 15 psig) SPECIFICATIONS - PHYSICAL CASE CLASSIFICATION General purpose for installation in weather-protected area MAXIMUM LENGTH OF LON CABLE 1600m (1 mile) DIMENSIONS 109mm H x 213mm W x 572mm D (4.4 H x 8.4 W x 24.8 D) WEIGHT 8.1 kg (18 lbs.) MOUNTING Inside a Platform or custom-installed in a panel SPECIFICATIONS - GAS CONNECTIONS OZONE AIR 1/4 O.D. tube fitting, stainless steel EXHAUST 1/4 O.D. tube fitting, stainless steel SAMPLE 1/8 O.D. tube fitting, stainless steel Note: a 1/4T - 1/8T Reducer is supplied in the ship kit. P10 WNX Sample Conversion Module/WCLD Analyzer Module August 1999 Rosemount Analytical H

19 PREFACE CUSTOMER SERVICE, TECHNICAL ASSISTANCE AND FIELD SERVICE 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 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 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. Return to: Rosemount Analytical Inc East La Palma Avenue Anaheim, California TRAINING A comprehensive Factory Training Program of operator and service classes is available. For a copy of the Current Operator and Service Training Schedule contact the Technical Services Department at: DOCUMENTATION Rosemount Analytical Inc. Phone: FAX: The following WNX Sample Conversion Module/WCLD Analyzer Module instruction materials are available. Contact Customer Service or the local representative to order Instruction Manual (this document) H Rosemount Analytical August 1999 WNX Sample Conversion Module/WCLD Analyzer Module P11

20 PREFACE COMPLIANCES The Wet NOx Conversion Module and the Wet CLD Analyzer Module carry approvals from several certifying agencies, including the Canadian Standards Association (which is also an OSHA accredited, Nationally Recognized Testing Laboratory), and TUV for use in non-hazardous, indoor locations. NRTL/C 97-C219 Rosemount Analytical Inc. has satisfied all obligations from the European Legislation to harmonize the product requirements in Europe. These products comply with the standard level of NAMUR EMC. Recommendation (May 1993). NAMUR This product satisfies all obligations of all relevant standards of the EMC framework in Australia and New Zealand. N96 P12 WNX Sample Conversion Module/WCLD Analyzer Module August 1999 Rosemount Analytical H

21 1 INTRODUCTION 1.1 OVERVIEW This manual describes the Wet NOx (WNX) Analysis System, a member of Rosemount Analytical's NGA 2000 Series of gas analysis components. The system consists of two modules: (1) a WNX Conversion Module (P/N ) and a WET CLD (WCLD) Chemiluminescense Analyzer Module (191110). The WCLD Module P/N contains only the functionality that is required in order to supplement the functionality of the WNX Module. An existing CLD Module P/N can be used in place of the WCLD Module P/N after being suitably modified in the field. This five-step modification disables unrequired functionality. It is described in Section 2-2. The WNX Module (Figures 1-1 and 1-2) accept a hot, wet sample stream, cools it, and dehumidifies it for use by the WCLD Analyzer Module (Figures 1-3 and 1-4). The hot sample is introduced to a converter (a heated bed of vitreous carbon) which converts all oxides of nitrogen (NOx) to nitric oxide (NO). The converter can be bypassed if the sample contains just NO. Once the sample contains only NO, it is directed to the dehumidifier, a Peltier device. The water vapor is cooled and condensed, and the condensate is removed periodically with a peristaltic pump. The cool, dry sample gas is sent to the WCLD for analysis. The WCLD Module uses chemiluminescense detection technology, a technique that is based on the reaction between nitric oxide (NO) and ozone (O3) to produce NO2 and oxygen (O2). Some of the NO2 molecules thus produced are 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* + O2 NO2* NO2 + red light The intensity of the emitted red light is proportional to the concentration of NO in the original gas sample and is measured by a photodiode H Rosemount Analytical August 1999 WNX Sample Conversion Module/WCLD Analyzer Module 1-1

22 INTRODUCTION 1.2 TYPICAL APPLICATIONS The major application of the WNX System is analysis of internal combustion engine exhaust. SAMPLE OUT DEHUMIDIFIER FLOW BALANCE Needle Valve Out In Drain SAMPLE IN MANIFOLD ASSEMBLY Solenoid Valve Top CONVERTER PERISTALTIC PUMP Top Pressure Regulator EXHAUST GAS RESTRICTOR Restrictor 70 cc/min. EXHAUST LIQUID FIGURE 1-1. WNX MODULE FLOW SYSTEM 1-2 WNX Sample Conversion Module/WCLD Analyzer Module August 1999 Rosemount Analytical H

23 INTRODUCTION Peristaltic Pump Power Module Board Intake Fan Dehumidifier LON/Power Module Computer Board Module Function Board Converter Exhaust Fan Manifold Assembly Rear Panel See Figure 2-1 for connections Module cover removed for clarity. FIGURE 1-2. WNX SAMPLE CONVERSION MODULE - TOP VIEW H Rosemount Analytical August 1999 WNX Sample Conversion Module/WCLD Analyzer Module 1-3

24 INTRODUCTION REDUCING BULKHEAD 1/4T - 1/8T BRASS CONNECTOR 1/8T - 1/8FPT BRASS OZONE GENERATOR OZONE AIR PRESSURE SWITCH TEE 1/8T BRASS RESTRICTOR 1/8T - 1/8MPT PRESSURE SENSOR REDUCING BULKHEAD 1/4T - 1/8T SS TUBE ADAPTER BRASS CONNECTOR 1/8T - 3/8MPT BRASS UNION 1/8T SS EXHAUST UNION 1/8T SS PORT CONNECTOR 1/8T CRES TEE 1/8T CRES UNION 1/8T SS OZONE EXHAUST REDUCING BULKHEAD 1/4T - 1/8T SS PUMP CAPILLARY 1/8 OD TEFLON CROSS 1/8T SS REDUCING UNION 1/8T - 1/16T SS REACTION CHAMBER SAMPLE SAMPLE CONNECTOR 1/8T - 3/8MPT SS SAMPLE CAPILLARY 70 cc/min OR 200 cc/min PRESSURE SENSOR Note: For the SAMPLE INLET, a 1/4T - 1/8T Reducer Fitting is supplied in the ship kit. FIGURE 1-3. WNX- ASSOCIATED WCLD MODULE FLOW DIAGRAM 1-4 WNX Sample Conversion Module/WCLD Analyzer Module August 1999 Rosemount Analytical H

25 INTRODUCTION Intake Fan Driver Board Exhaust Fan Ozonator Signal Board Detector Power Supply Board Computer Board FIGURE 1-4. WNX-ASSOCIATED WCLD MODULE - TOP VIEW H Rosemount Analytical August 1999 WNX Sample Conversion Module/WCLD Analyzer Module 1-5

26 INTRODUCTION NOTES 1-6 WNX Sample Conversion Module/WCLD Analyzer Module August 1999 Rosemount Analytical H

27 2 INSTALLATION 2.1 UNPACKING If either the WNX Sample Conversion Module or the WCLD Chemiluminescense Analysis Module is received as a separate unit, carefully examine the shipping carton and contents for signs of damage. Immediately notify the shipping carrier if the carton or contents is damaged. Retain the carton and packing material until all components associated with the module are operational. 2.2 MODIFICATION OF A CONVENTIONAL CLD FOR USE IN A WNX SYSTEM A WCLD Module, P/N , or its functional equivalent, is required for use in a WNX System. Five steps must be taken to modify a conventional CLD module, P/N , to be functionally equivalent. These five steps apply just to the CLD Module. Refer to the instructions below and to the manual for that product. Step 1 - There must not be a flow restrictor in the SAMPLE IN fitting of the CLD. If there is, the bulkhead fitting in which it is contained must be removed and replaced with a similar bulkhead fitting that does not contain a flow restrictor. Then, for the remainder of this preparation, temporarily place a restriction in the sample line to the CLD to limit flow to less than 2200 cc/min. This restriction must be removed before plumbing into a WNX System. Step 2 - With zero gas flowing, adjust the back-pressure regulator that controls capillary head pressure in the CLD to 5-6 psig ( hpa). Do not change this adjustment later. Step 3 - Select the NO mode. Do not change this adjustment later. Step 4 - Verify that the CLD responds properly to an appropriate span gas. Step 5 - Now that the CLD is operating properly, disconnect power from it, turn off all gases, and remove the restriction that was placed in the sample line. The CLD is then ready for use in a WNX System H Rosemount Analytical August 1999 WNX Sample Conversion Module/WCLD Analyzer Module 2-1

28 INSTALLATION 2.3 ASSEMBLY If the WCLD module requires assembly with other components (e.g., a Multi Module Enclosure), do so at this time. Following the guides on the bottom of the enclosure, carefully slide the module halfway into place. The WNX module may not be used in a Platform. CAUTION: HAND INJURY HAZARD Do not place hands or fingers in enclosure front handles when the front panel is open. Dropping front panel while hand or fingers are inside either handle can cause serious injury. Lift the spring-loaded pins on the front of the module, and carefully slide it the rest of the distance. Secure the module in position by releasing the pins, which seat in the available holes in the bottom of the case. Connect one of the network cables to either NETWORK 1 or NETWORK 2 connections on the front panel of the module. Connect one of the power cables to the power connection on the front panel also. (See Figure 2-1.) Secure the front panel with the six screws provided. 2.4 LOCATION Install the modules in a clean, level, weather-proofed, vibration-free location free from extreme temperature variations and moisture. For best results, install the Wet NOx Module near the sample stream and the CLD Module near the Wet NOx Module to minimize sample transport time. Operating ambient temperature is 10 C to 40 C (50 F to 104 F). Temperature change should not exceed 10 C (18 F) per hour. The same restriction on temperature range applies to the location of the air and span gas cylinders. NOTE Unrestricted air flow at the rear of each module is critical to its performance and reliability (See Figures 2-1 and 2-2). Unrestricted air flow at the left side (air intake) of the WNX is critical to its performance and reliability (See Figure 2-3). 2-2 WNX Sample Conversion Module/WCLD Analyzer Module August 1999 Rosemount Analytical H

29 INSTALLATION 2.5 GASES OVERVIEW The WNX Module is used in concert with a WCLD Analyzer Module, either a standard CLD or one specially configured for use with a WNX Module. In either case, certain functions are retained by the CLD Module while other functions are assumed by the WNX Module, and these functions determine gas connections to each module. The hot, wet sample and all calibration standard gases are introduced to the WNX Module at the SAMPLE IN connection. The dry sample gas emerging from the SAMPLE OUT connection of the WNX Module is conveyed to the CLD SAMPLE IN connection via appropriate tubing. The CLD retains all ozonator functions, including introduction of breathing grade air or oxygen at its OZONATOR AIR connection. Calibration gases and ozonator-source gas should be supplied from a cylinder equipped with a clean, non-corrosive, two-stage regulator. A shutoff valve is recommended PNEUMATIC CONNECTIONS All pneumatic connectors on both modules are ferrule-type compression fittings. The SAMPLE OUT connection of the WNX Module is 1/8-inch. The SAMPLE IN connection of the CLD Module is either 1/4-inch (WCLD P/N and CLD P/N ). The 1/4-inch to 1/8-inch reducing fitting supplied with the WCLD (or CLD) should be used, as close as practical to the CLD Module. Interconnect the two modules using 1/8-inch teflon or stainless steel tubing. The tubing should be as short as practical. Connect lines for SAMPLE-IN, GAS EXHAUST, and EXHAUST LIQUID to appropriately labeled fittings on the rear panel of the WNX Module. A heated line with materials of construction that are suitable for the sample must be used for the sample line to the WNX Module. The remaining lines may be teflon or stainless steel. Connect lines for AIR/OXYGEN and EXHAUST to appropriately labeled fittings on the rear panel of the CLD Module. The exhaust lines should be 1/4 inch (6.3 mm) or larger. These lines must not be restricted SPECIFICATIONS CALIBRATION GASES - Either U.S.P. breathing grade air or nitrogen is recommended for use as zero gas. A mixture of NO or NO2 in a background of H Rosemount Analytical August 1999 WNX Sample Conversion Module/WCLD Analyzer Module 2-3

30 INSTALLATION nitrogen is recommended as span gas. For maximum accuracy, the concentration of NO in the span gas should be about the same as that in the expected sample stream. SAMPLE - The sample to the WNX Module must be clean and hot before entering the WNX Module. Sample should be filtered for particulates down to two microns. The sample to the CLD Module should be clean and dry. OZONATOR SOURCE GAS - For analyzers with ranges less than 0 to 2,500 ppm, U.S.P. breathing grade air should be used for generation of the ozone required for the chemiluminescence reaction. For ranges greater than 0 to 2,500 ppm, breathing grade oxygen is required. PRESSURE - Zero gas, span gas and sample should be introduced at the SAMPLE IN fitting of the WNX Module at between 345 and 620 hpa-gauge (5 and 9 psig). Bypass flow rate should be approximately 1000 cc/min. with backpressure regulator pressure adjusted to 344 hpa (5 psig). NOTE At no time should flow of zero gas, span gas, or sample exceed 2200 cc/min. Damage to internal components may occur if this flow level is exceeded. Ozonator-source gas should be introduced at the AIR/OXYGEN fitting of the CLD Module at between 690 and 1035 hpa-gauge (10 and 15 psig) of ozonator air (or oxygen, if appropriate) NOTE At no time should ozonator gas pressure exceed 2070 hpa-gauge (30 psig). Damage to internal components may occur if this pressure level is exceeded. LEAK TEST - Each module is completely tested at the factory for gas leakage. During installation, the user is responsible for leak testing only at the inlet and outlet fittings on the rear panel. To prevent exposure to airborne contaminants, the user should periodically do an internal leak test (with a test procedure chosen by the user). Limits and health effects of some of the airborne contaminates are shown below. Federal health standards are established to provide an adequate margin of safety in protecting public health. As specified by Federal air quality standards, the maximum permissible outdoor air level is: Ozone (O3) (one hour average): Not to exceed 0.12 ppm (one hour average) more than one day per year. 2-4 WNX Sample Conversion Module/WCLD Analyzer Module August 1999 Rosemount Analytical H

31 INSTALLATION Nitrogen Oxides (NOx) includes Nitric Oxide (NO) and Nitrogen Dioxide (NO2). Nitrogen Oxides make up a major part of PM10 - fine particle pollution (less than 10 micrometers in size). Nitric Oxide (NO) exposed to Ozone (O3) produces Nitrogen Dioxide (NO2) and Oxygen (O2). Nitrogen Dioxide (one year average): Not to exceed ppm for one year average Evidence suggests that repeated exposure to high ozone levels may cause irreversible damage to the lung. Health effects of ozone are complicated by the presence of other pollutants, such as nitric acid, PM10 and nitrogen dioxide. In animals, ozone mixed with acids has been found to be more harmful than ozone alone. The harm depends on the situation: The person who is exposed to pollution (health, age, sex, nutritional and smoking status, sensitivity), the type and concentration of pollutant, the place, time, temperature and humidity. Inhaled fine particles pose a health risk when they penetrate deeply into respiratory tract. Most particle penetration into lungs occur during mouth breathing H Rosemount Analytical August 1999 WNX Sample Conversion Module/WCLD Analyzer Module 2-5

32 INSTALLATION FLOW BALANCE SAMPLE OUT SAMPLE IN EXHAUST GAS EXHAUST LIQUID CONVERT. VENT RESTRICTOR EXHAUST FAN FIGURE 2-1. REAR PANEL CONNECTIONS OF THE WNX MODULE OZONATOR AIR EXHAUST SAMPLE IN EXHAUST FAN INTAKE FAN FIGURE 2-2. REAR PANEL CONNECTIONS OF THE WCLD MODULE FIGURE 2-3. WNX INTAKE FAN LOCATION INTAKE FAN 2-6 WNX Sample Conversion Module/WCLD Analyzer Module August 1999 Rosemount Analytical H

33 INSTALLATION 2.6 ELECTRICAL CONNECTIONS Two electrical connections are required on each module: POWER and NETWORK. These connections are located on the front panel of each module, see Figures 2-4, 2-5 and 2-6. On each module, two NETWORK connectors are available, either of which is appropriate for: 1) interconnection with the network or 2) "daisy-chaining" with other NGA 2000 components. Connect enclosure power or external 24 VDC power source to the POWER connection of each module. (The WNX Module may use as much as 8 A power). NETWORK1 NETWORK2 POWER FUSE FIGURE 2-4. ELECTRICAL CONNECTIONS H Rosemount Analytical August 1999 WNX Sample Conversion Module/WCLD Analyzer Module 2-7

34 INSTALLATION FRONT VIEW 6.8 [173] 8.4 [213] 8.2 [208].6 [15].5 [13] 4.3 [109] 2.8 [72] SIDE VIEW 1.1 [28] 6.0 [152] 22.4 [572].5 [13] 1.3 [33] REAR VIEW Dimensions: 7.3 [185] 4.2 [106] 4.1 [104] INCH [MM] 3.5 [88] 1.4 [37] SAMPLE OUT EXHAUST LIQUID FLOW BALANCE SAMPLE IN EXHAUST GAS CONVERT. VENT RESTRICTOR 3.6 [92] 2.7 [68] 1.7 [43].6 [14] FIGURE 2-5. OUTLINE AND MOUNTING DIMENSIONS OF WNX MODULE 2-8 WNX Sample Conversion Module/WCLD Analyzer Module August 1999 Rosemount Analytical H

35 INSTALLATION FRONT VIEW 8.2 [208] 8.4 [213].4 [10].7 [18].8 [20] 4.3 [109] 2.8 [71] 1.1 [28] 6.0 [152] SIDE VIEW 17.5 [445].5 [13] 1.3 [33] REAR VIEW 4.1 [104].9 [23].9 [23] 1.3 [33] Dimensions: INCHES [MM] FIGURE 2-6. OUTLINE AND MOUNTING DIMENSIONS OF WCLD MODULE H Rosemount Analytical August 1999 WNX Sample Conversion Module/WCLD Analyzer Module 2-9

36 INSTALLATION CONVERTER HEATER PELTIER DEVICE IN DEHUMIDIFIER MANIFOLD HEATERS FIN FAN FIN FAN OVEN FAN CONVERTER THERMOSTAT DEHUMIDIFIER THERMOSTAT OVEN THERMOSTAT NOx/NO SOLENOID PERISTALTIC PUMP PUMP ON/OFF SWITCH J22 J12 J14 J20 J4 J19 J16 J15 J18 J8 J10 RTD IN CONVERTER J1 J23 J2 MODULE FUNCTION PCB ASSEMBLY J5 J9 THERMISTORS IN DEHUMIDIFIER THERMISTORS (2) Manifold and Case J11 J6 J13 J3 J17 J7 CABLE, DIGITAL I/O CABLE, CONTROLLER POWER HARNESS, MODULE FUNCTION 5, 24 VOLT POWER HARNESS, MODULE FUNCTION ±15 VOLT POWER CABLE, ANALOG I/O CABLE, DIAGNOSTICS J1 J2 J4 J5 MODULE COMPUTER PCB ASSEMBLY J6 J6 J4 POWER MODULE PCB ASSEMBLY J3 J2 LON POWER PCB ASSEMBLY J1 J2 NC NETWORK CABLE J3 J1 J3 24 VOLT POWER CABLE J7 J5 J5 GND CABLE, INTERNAL NETWORK FIGURE 2-7. WIRING DIAGRAM OF WNX MODULE 2-10 WNX Sample Conversion Module/WCLD Analyzer Module August 1999 Rosemount Analytical H

37 INSTALLATION THERMISTOR ASSY DETECTOR BLOCK PRESSRE SENSOR ASSY 0-15 PSIG - SAMPLE PHOTODIODE RESISTOR HARNESS, SIGNAL POWER NC SENSOR ASSY 0-30 PSIG OZONE SOURCE J4 J2 J11 J8 J6 J7 J13 J1 J9 SIGNAL BOARD J3 J2 J3 POWER SUPPLY BOARD J11 J2 J1 J13 J6 E2 E1 E3 J5 J1 J2 J3 EXTERNAL NETWORK CABLE EXTERNAL POWER CABLE CABLE ASSY, ANALOG I/O CABLE ASSY, DIAGNOSTICS HARNESS, EXPANSION I/O J4 J5 J1 J6 GND CABLE ASSY, INTERNAL NETWORK TRANSISTOR ASSY, NPN 2SD1308 OZONE-SOURCE PRESSURE FAN ASSY FAN ASSY J2 COMPUTER ANALYSIS BOARD HEATER/OVER TEMP/FUSE DETECTOR BLOCK OZONATOR HEATER J3 J7 J12 J1 J2 J3 J4 J8 J9 J5 DRIVER BOARD J10 OZONATOR POWER SUPPLY J11 J21 J6 HARNESS, DRIVER PWR HARNESS, DIGITAL I/O FIGURE 2-8. WIRING DIAGRAM OF WCLD MODULE H Rosemount Analytical August 1999 WNX Sample Conversion Module/WCLD Analyzer Module 2-11

38 INSTALLATION NOTES 2-12 WNX Sample Conversion Module/WCLD Analyzer Module August 1999 Rosemount Analytical H

39 3 STARTUP AND OPERATION 3.1 OVERVIEW Prior to initial startup, the user should leak test the fittings on the rear panels of the modules, as outlined in Section 2. For the remainder of this section, Analyzer Module interconnection with a Platform or some interfacing component will be assumed. Display and Keypad information shall refer to that which the user can expect to see and do with regard to the Front Panel of the Platform. For a complete description of Platform Front Panel controls and indicators, see Section 1 of the Platform Components instruction manual. 3.2 DISPLAYS Three kinds of Display screens relating to the combined WNX-WCLD Analyzer Module system are available to the user: Run Mode Menu Help See Figures 3-1 through 3-5. For details of the menu structure of the WNX and WCLD Modules, see Figures 3-6 and 3-7 through 3-11, respectively RUN MODE DISPLAY The Run Mode is the normal mode of operation, see Figure 3-1. In this mode, the Display will show current gas measurement (as measured by the WCLD), the component of interest, the current operations of the softkeys, and two graphics: 1) a bar representing the displayed concentration as a percent of fullscale and 2) two arrowheads marking approximate positions of low and high alarm setpoints along the fullscale bar H Rosemount Analytical August 1999 WNX Sample Conversion Module/WCLD Analyzer Module 3-1

40 STARTUP AND OPERATION MENU DISPLAYS The Menu structure enables the user to access data and functions, and put information onto the network. From the Run Mode display, press the MENUS softkey to gain access to the Main Menu. The Main Menu (see Figure 3-2) is subdivided into three levels of control based generally on which personnel is likely to use it: Basic Controls, Expert Controls and Technical Controls. No Basic Controls relate to WNX function. (See Figures 3-3 and 3-4.) HELP DISPLAYS The Help structure provides context-sensitive, topic-interconnected on-line information, so that the user can operate NGA 2000 without frequent reference to the instruction manual. Press the INFO softkey for help. 3.3 STARTUP PROCEDURE Note Both modules must be functional with all components at proper operating temperature before a wet sample is applied. If not, either or both modules may be damaged by condensed water. Either module may be started up independently of the other. This may be helpful during initial startup and familiarization. This is accomplished by applying 24-volt power to one module at a time. In this case, refer only to the instructions below that apply to the module that is being started up. Apply power to the WNX and WCLD modules. If they are associated with an enclosure such as a dual analyzer enclosure, do this by plugging in the enclosure to a power source. The enclosures have no ON/OFF power button. Once power has been supplied to the enclosure, both modules will be energized. The startup sequence will interrogate the network to locate and identify all components on the network. The user will have to bind appropriate combinations of components after the startup sequence The WNX and CLD modules are automatically bound to each other. During startup, the Display will appear as in Figure 3-1, except that the blinking message, "WARMING UP," will appear above the softkey labels. Bind any unbound components, calibrate the system, optimize the converter efficiency, and begin routine operation as following sections indicate. 3-2 WNX Sample Conversion Module/WCLD Analyzer Module August 1999 Rosemount Analytical H

41 STARTUP AND OPERATION WARM-UP OF THE WNX MODULE Refer to Figure 3-6, WET NOx Display Screens. Select the Power Supply Voltages screen. The voltages labeled was refer to the values measured during factory checkout. The voltages labeled is refer to the current values, updated at 1-10 second intervals by the module computer. Verify that the is values are within 10% of the corresponding was values. Select the Module Start Up screen. When the three temperatures that are displayed become stable, the WNX Module is warmed up. At that time, the Enclosure temperature should be between 60 C and 70 C, the Dehumidifier coldside temperature should be between 3 C and 7 C and the Converter temperature should be between 300 C and 400 C. The latter temperature is user-selectable, to optimize converter efficiency as explained in Sections 3.6 and WARM-UP OF THE WCLD MODULE Refer to Figures 3-7 through 3-11, WCLD Display Screens. Within the Technical Configuration Menu, select the Analyzer Diagnostics Power Supply Voltages screen. The voltages labeled was refer to the values measured during factory checkout. The voltages labeled is refer to the current values, updated at 1-10 second intervals by the module computer. Verify that the is values are within 10% of the corresponding was values. Within the Technical Configuration Menu, select the Analyzer Start Up screen. When the Sensor temperature and Detector Block temperatures are stable between -0.5 C and 0.5 C and 51.0 C and 52.0 C, respectively, the WCLD Module is warmed up. Establish that ozonator air and sample pressures are within specifications (see Specifications in the Preface section of this manual). 3.4 BINDING Although the WNX and WCLD Modules are automatically bound, to achieve full coordination between the modules and other related NGA 2000 components (e.g., I/O Modules), the user must bind those components using functions in the System Set Up portion of the Technical Configuration Menu. (See Figure 3-6.) Follow the Binding Procedure as outlined in the I/O Modules manual H Rosemount Analytical August 1999 WNX Sample Conversion Module/WCLD Analyzer Module 3-3

42 STARTUP AND OPERATION 3.5 CALIBRATION After the warm-up period (about one hour), the system is completely functional, but the gas measurement reading is probably inaccurate. A secondary blinking message ("NOT CALIBRATED") explains why. Under the Expert Controls and Setup menu (see Figure 3-9), use the Right arrow key to select Analyzer Module Setup, then select Calibration Gas List. Input appropriate data here. Under the Expert Controls and Setup menu (see Figure 3-8), select Expert Analyzer Controls and then Range Settings. Select the range that will be used during sample analysis. Introduce zero gas into the SAMPLE INLET, and, after a stable reading is reached, do the following: 1. If the Multi-Analyzer Module split Run Mode display is shown, use the arrow keys to highlight the Analyzer Module to be calibrated and press the select key. The desired Analyzer Module's Run Mode display is then shown. 2. Press the MENUS softkey to enter the Main Menu. 3. Make the following selections from the Main Menu: Expert Controls and Setup, Expert Analyzer Controls, and Zero/Span Calibration. 4. Press the ZERO softkey to enter the Analyzer Zero menu. 5. Press the ZERO softkey and wait. 6. Introduce a suitable span gas into the SAMPLE INLET. Note The TEA Scrubber accessory (P/N NL635741) can be used to remove residual NO2 from the NO cylinders. Use of this accessory allows an NO2-free NO gas. 7. Press the SPAN to enter the Analyzer Span menu, press SPAN again and wait. 8. Press the HOME softkey to re-enter the Main Menu. 9. Press DISPLAY softkey for the Run Mode Display. After initial startup, that the WCLD Analyzer Module should be calibrated at least once every eight hours. This practice should continue until experience indicates that some other interval is more appropriate depending on the analytical accuracy required. If the user is unable to calibrate the Analyzer Module (i.e., when ZERO or SPAN is initiated, nothing happens), a possible cause may have been the use of an 3-4 WNX Sample Conversion Module/WCLD Analyzer Module August 1999 Rosemount Analytical H

43 STARTUP AND OPERATION incorrect gas for zeroing or spanning (e.g., using a high concentration gas to zero or a zero gas to span the Analyzer Module). Simply recalibrating with the appropriate gas(es) will not correct the problem because the ZERO OFFSET or SPAN FACTOR has been set to an extreme value in the process. To remedy the problem, do the following: 1. Select the following from the Main Menu: Expert Controls and Setup, Analyzer Module Set Up, and Calibration Parameters. 2. Using the Right arrow, select Zero Ranges, press ENTER and, using the up/down arrows, toggle to SEPARATE. Do the same for the Span Ranges selection. Do not press ESCAPE at any time unless retention of prior settings is desired. 3. Return to the Main Menu and make the following selections: Expert Controls and Setup, Expert Analyzer Controls, Zero/Span Calibration, FACTORS softkey, and Range 1 (2, 3, 4) Factors (do Steps 4 and 5 for each range). 4. Select Zero Offset, press ENTER, adjust the value to with the Up and Down arrow keys, and press ENTER. Do not press ESCAPE at any time unless retention of prior settings is desired. 5. Select Span Factor, press ENTER, adjust the value to with the Up and Down arrow keys, and press ENTER. Do not press ESCAPE unless retention of prior settings is desired. 6. Attempt to recalibrate the Analyzer Module according to the procedure outlined at the beginning of section 3.5. If recalibration fails, return to the Range Factors menu, readjust Zero Offset and Span Factor values, and try calibrating again. 3.6 CONVERTER TEMPERATURE ADJUSTMENT PROCEDURE The vitreous carbon converter used in the WNX Module must be checked periodically to assure that it is working at peak efficiency. The efficiency of the converter is typically 95% to 98%, that is, 95% to 98% of the nitrogen dioxide introduced to the module is reduced to nitric oxide. That is well above the 90% minimum required by the Environmental Protection Agency. (Refer to 40 CFR 60, App. A, Method 20, Paragraph 5.6.) Two conditions reduce the efficiency of the converter: Note: Converter Include typical curves as in material acceptance memo H Rosemount Analytical August 1999 WNX Sample Conversion Module/WCLD Analyzer Module 3-5

44 STARTUP AND OPERATION The converter is operating at too low a temperature and the efficiency drops or the converter is operating at too high a temperature and the nitrogen dioxide is reduced to nitrogen, which is not detectable by the chemiluminescence reaction. Initially, an interval of one week between converter efficiency checks is recommended because high temperature operation changes conditions inside the converter. The active surface area of the vitreous carbon increases through use. Initially, when the surface area is low, the temperature at which converter efficiency peaks is relatively high. This temperature decreases as surface area increases, and less external energy is required to cause adequate conversion. The nominal range of converter operational temperatures is 300 C to 400 C (572 F to 752 F). The current "Converter temperature" can be located in the Wet NOx Sample Handling Module menu by entering the following from the Main Menu: Expert controls and setup, Auxiliary module setup, [select WNX Module]. Follow this procedure to optimize the operating temperature of the converter: 1. Power up the WNX System and allow it to stabilize at operating temperature (about one hour). 2. Check the converter temperature in the Wet NOx Sample Handling Module menu (as noted above). Note the value for future reference. 3. Introduce a calibration gas of known (NO2) concentration into the analyzer and note the concentration value determined (on the Run Mode screen) when the full response has been achieved. 4. Change "Converter set point" in the Wet NOx Sample Handling Module menu to 300 C. Allow module 15 minutes to stabilize, recheck the concentration value and note the value for later use. 5. Increase the "Converter set point" value in the Wet NOx Sample Handling Module menu by 20 C, wait 15 minutes, and note the concentration value. Repeat this step until either a converter efficiency of between 95% and 98% is obtained or the final 20 C increment gives an efficiency increase of less than one percent. 6. Decrease the "Converter set point" value by 5 C, which places the converter at a temperature suitable for low ammonia interference and efficient NO2 conversion. 7. Recheck the converter temperature and compare it to the initially recorded value. Note Converter temperature is not a direct measure of converter efficiency. Temperature measurement is for reference purposes only. 3-6 WNX Sample Conversion Module/WCLD Analyzer Module August 1999 Rosemount Analytical H