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Ametek 888 User Manual

Tail gas analyzer for class i, division 2 areas
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See also: User Manual
Model 888 Tail Gas Analyzer
Class I, Division 2, GPS A, B, C, D
User Manual
Process Instruments
Western Research
455 Corporate Boulevard
Newark, DE 19702
PN 883056902 REV. H

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  • Page 1 Model 888 Tail Gas Analyzer Class I, Division 2, GPS A, B, C, D User Manual Process Instruments Western Research 455 Corporate Boulevard Newark, DE 19702 PN 883056902 REV. H...
  • Page 2 © 2015 AMETEK Process & Analytical Instruments Division This document contains Essential Health and Safety information for the use of the AMETEK Model 888 DIV 2 Tail Gas Analyzer. Data herein has been verified and validated and is believed adequate for the intended use of this instrument. If the instrument or procedures are used for purposes over and above the capabilities specified herein, confirmation of their validity and suitability should be obtained;...

  • Page 3: Table Of Contents

    Storage Information ....................9 Warning Labels ....................10 Special Warnings and Information ............... 15 Warranty and Claims ................... 16 CHAPTER 1 Overview Model 888 Tail Gas Analyzer ................1-1 Electronics Enclosure...................1-2 Photometer....................1-2 Xenon Lamp Assembly ................1-3 Detector Assembly ..................1-3 Lamp & Detector Mounting ................1-3 User Interface/Host Display .................1-4...
  • Page 4 Period 2 – Flush and Zero................C-1 Period 3 – Sample Flush ................C-2 Period 4 – Measure ..................C-2 Zero and Photo-Span Calibration ............C-2 Operation Sequences ................C-3 4 | Model 888 Tail Gas Analyzer Class I, Division 2...
  • Page 5 Period 5 – Flush and Zero................C-3 Period 6 – Track Zero.................. C-3 Period 7– Photo-Span Calibration............... C-3 Period 8 – Track Photo-Span Calibration ............ C-4 Steam Blowback ................... C-4 Period 9 – Pre-Steam Flush ................ C-4 Period 10 – Steam Blowback ..............C-4 Period 11 –...
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  • Page 7: Safety Notes

    About This Document This document describes the user instructions for the safe operation of the Model 888 Analyzer intended for use in Class I, Division 2 areas. The procedures and information discussed in this document are the pro- cedures to install, operate, and perform maintenance on the Model 888 Analyzer including all relevant safety warnings and cautions to ensure the safety of personnel and the analyzer in Class I, Division 2 locations.

  • Page 8: Important Safety Information

    Verify ground continuity of all equipment before applying power. For electrical shock protection, the analyzer must be operated from a grounded power source that has a securely connected protective WARNING ground contact. 8 | Model 888 Tail Gas Analyzer Class I, Division 2...

  • Page 9: Storage Information

    Storage Information Humidity may damage the installed Optical filters. Any such dam- age is not covered by warranty. Please consult Ametek customer WARNING service or your local representative for service advice.

  • Page 10: Warning Labels

    Achtung - Heiße Oberfläche Environmental Information (WEEE) This AMETEK product contains materials that can be reclaimed and recycled. In some cases the product may contain materials known to be hazardous to the environment or human health. In order to prevent the release of harmful substances into the environment and to conserve our natural resources, AMETEK recommends that you arrange to recycle this product when it reaches its “end of life.”...
  • Page 11 CAUTION The various configurations of the Model 888 should not produce, or fall victim to, elec- tromagnetic disturbances as specified in the European Union’s EMC Directive. Strict compliance to the EMC Directive requires that certain installation techniques and wiring practices are used to prevent or minimize erratic behavior of the Analyzer or its electronic neighbors.
  • Page 12 Classified, Hazardous Area Protection Components and Functions This version of the Model 888 is designed to be used in Class I, Division 2 classified hazardous areas and complies with those requirements for electrical equipment. The redundant heater control and enclosure designs assure that the system will not ignite surrounding gases.
  • Page 13 Working with the electronics enclosure in an open position is typically done only during installation, start-up (and verification), and certain troubleshooting and maintenance procedures. In these cases, appropriate safety conditions must have been met, per company policy. The analyzer may only be energized with permission of the works manager or his proxy.

  • Page 14: Special Warnings And Information

    2 wiring methods and in accordance with the authority having jurisdiction. CAUTION Exposure to some chemicals may degrade the sealing properties of materials used in the following devices: All Relays. WARNING 14 | Model 888 Tail Gas Analyzer Class I, Division 2...

  • Page 15: Warranty And Claims

    (90) days from date of shipment. Resale items warranty is limited to the transferable portion of the original equipment manufac- turer’s warranty to AMETEK. If you are returning equipment from outside the United State, a statement should appear on the documentation accompanying the equipment being returned declaring that the goods being returned for repair are American goods, the name of the firm who purchased the goods, and the shipment date.
  • Page 16 IN CONJUNCTION WITH EQUIPMENT OF OUR MANUFACTURE. WE DO NOT AUTHORIZE ANY REPRESENTATIVE OR OTHER PERSON TO ASSUME FOR US ANY LIABILITY IN CON- NECTION WITH EQUIPMENT, OR ANY PART THEREOF, COVERED BY THIS WARRANTY. 16 | Model 888 Tail Gas Analyzer Class I, Division 2...

  • Page 17: Chapter 1 Overview

    OVERVIEW Model 888 Tail Gas Analyzer uses photometric analysis to The AMETEK Model 888 Tail Gas Analyzer continuously monitor hydrogen sulfide, H S, and sulfur dioxide, SO , pres- ent in the tail gas stream of a Claus plant. Electronics Enclosure...

  • Page 18: Electronics Enclosure

    The electronics enclosure houses the source and detector assemblies. The sample conditioning enclosure houses the light tube, mirror-block, and sample cell assemblies. All of the photometer components are rigidly connected for optical stability. 1-2 | Model 888 Tail Gas Analyzer Class I, Division 2...

  • Page 19: Xenon Lamp Assembly

    Xenon Lamp Assembly The source module consists of a high quality 3 mm arc xenon flash lamp, 0.1 uF close-coupled capacitor, and trigger electronics (with 50 Hz flash rate). The close-coupled capacitor and trigger electronics are potted inside a metal enclosure. The xenon lamp assembly is powered from the Xenon Lamp Power Supply PCB.

  • Page 20: User Interface/Host Display

    Sample Conditioning (Oven) Enclosure Sample Cell Oven Enclosure Aspirator Heat Exchanger Cell Isolation/Steam Demister Blowback Low Pressure Operator Heater Aspirator Zero Flush Heat Exchanger Flange RTD Figure 1-4. Oven Enclosure (interior) 1-4 | Model 888 Tail Gas Analyzer Class I, Division 2...

  • Page 21: Flow Diagrams

    Figure 1.5.1 Flow Diagram. No Steam Blowback Figure 1.5.2 Flow Diagram. With Steam Blowback Overview...

  • Page 22: Light Tube/Mirror Block Assembly

    The sample cell is secured to the light tube via 2 SST plates as well as a thumb screw located below the center of the cell body. 1-6 | Model 888 Tail Gas Analyzer Class I, Division 2...
  • Page 23 Aspirator The aspirator pressure regulator and proportional solenoid valve (PSV) control the flow of instrument air or nitrogen through the aspirator. The air flow to the aspirator enters through the tube bushing assembly into the oven where the aspirator drive air is pre-heated by an aluminum heat exchanger.

  • Page 24: Steam Blowback Valve

    (CV1) using PV1 to control the flow. The aspirator gas supply is heated before contacting the aluminum aspirator and pipe flange that must remain at oven temperature. Figure 1-7a. Customer Connection Enclosure. 1-8 | Model 888 Tail Gas Analyzer Class I, Division 2...

  • Page 25: Customer Connections Enclosure

    Customer Connection Enclosure All customer power and signal connections are made within the customer connection enclosure located below the electronics enclosure. Signal con- nections are provided for Ethernet, Modbus, Alarm Relays, Analog Out- puts, and Remote Inputs. The analyzer supports FTP and Telnet functions over an Ethernet connection.

  • Page 26: Customer Drawing Package

    Figure 1-8 outlines the normal cycles and special periods indicating all of the valve states and default timing. Refer to Appendix C for detailed information. 1-10 | Model 888 Tail Gas Analyzer Class I, Division 2...

  • Page 27: Sample Flow

    TIMING AND CONTROL CHART PV1-Aspirator SV3-Steam FV3-Steam SV1 Demister SV2-Flush Solenoid SV5-Aspirator Proportional Data Blowback Blowback Valve Analog Next Normally Normally Solenoid Valve Valid Time Solenoid Steam Blowback Outputs Period Period Name Open Normally Closed Normally Relay Closed Normally Closed Normally Closed Closed Special...
  • Page 28 When steam is turned on it is injected by the steam valve, FV3, into the top of the demis- ter. 1-12 | Model 888 Tail Gas Analyzer Class I, Division 2...

  • Page 29: Chapter 2 Specifications

    SPECIFICATIONS Model 888 Tail Gas Analyzer Standard Range: 0-2% H S and 0-1% SO Ranges High Range: 0-4% H S and 0-2% SO Other ranges available upon request. All performance specifications are based on normal Performance operation that includes periodic zero and photo span calibration.
  • Page 30 -20° to +60°C ( -4° to +140°F ) Conditions The analyzer must be shaded from direct sunlight. Electronics and oven enclosures, backplate, and keypad are 316 stainless steel. Enclosures Customer connection enclosure is fiber-reinforced polyester. 2-2 | Model 888 Tail Gas Analyzer Class I, Division 2...
  • Page 31 Power Consumption (specified at time of purchase) 120 VAC (105-132 VAC), 47-63Hz, 500W 240 VAC (209-264 VAC), 47-63Hz, 500W Instrument Air Utility Pressure 379-517 kPa (55 to 75 psig / 3.8-5.2 barg) Requirements Air Quality: As per ANSI/ISA standard 7.0.01-1996) Steam Ball Valve Jacket Pressure: 517-690 kPa (75 to 100 psig \ 5.2-6.9 barg)
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  • Page 33: Chapter 3 Installation And Start-Up

    WARNING Refer service requirements to qualified personnel. Read this entire section before beginning installation of the Model 888 Analyzer. Failure to do so, and / or use of the analyzer in a manner not specified in this manual, may impair the protection against fire,...

  • Page 34: Analyzer Site Preparation

    Analyzer Site Preparation The 888 Tail Gas Analyzer is approved for installation in hazardous areas classified as Class I, Division 2. The analyzer must be installed on a horizontal run of the tail gas pipe. A site plan should be prepared defining the system mounting location and provisions for power/data interconnect wiring.
  • Page 35 Figure 3-1. Installation Drawing Installation and Start Up...

  • Page 36: Installation Guidelines

    If using an existing sample tap, make sure that it is internally free of solidified sulfur. The Model 888 returns the sample to process through the annular space around the O.D. of the probe tube. In most cases, the 1/2-inch O.D.

  • Page 37: Sample Tap Preparation

    This will prevent plugging the sample tap with solid sulfur which would interfere with commissioning the analyzer. AMETEK recommends that a heated, 1-inch ball valve with a 2-inch, 150 lb. raised face flange (AMETEK PN 203176001 Steam Jacketed Ball Valve or equivalent) be installed on the nozzle.

  • Page 38: Installation Procedure

    FRESH-AIR BREATHING APPARATUS. Remove the blind flange from the ball valve. Test to make sure that the valve is not leaking toxic process gases. If toxic gases are not detected 3-6 | Model 888 Tail Gas Analyzer Class I, Division 2...

  • Page 39: Installing The Probe

    in the area, it is safe to remove the fresh-air apparatus until the probe installation (Step 8). Install a gasket on the top of the steamjacketed main sample valve. Us- ing suitable lifting equipment, lower the analyzer into place so that: The analyzer back plate is parallel with the tail gas pipe, and The sample inlet flange and main sample valve flange bolt patterns line up.
  • Page 40 Do not remove breath- ing apparatus until installation is complete and all fittings have been WARNING checked for toxic gas leaks. Figure 3-2a. Inlet, Valve and Vent Locations - No Steam Blowback 3-8 | Model 888 Tail Gas Analyzer Class I, Division 2...
  • Page 41 Figure 3-2b. Inlet, Valve and Vent Locations - Steam Blowback Install the probe through the sample inlet flange, main process valve, and into the process: Slide the probe tube down into the flange fitting. If the probe tube is longer than 16 inches, it may be necessary to remove the sample oven cover plate and lower the probe/valve assembly through the top of the sample oven.
  • Page 42 Pressure Transducer, 0-50 psia 273451001 Gauge Aspirator Pressure 251744000 PCV3 Pressure Regulator, Purge,0-60 psig 203188003 Guage, Purge, 0-60 psig 273472001 Table 1. Parts Legend - Refer to Figure 3-2. 3-10 | Model 888 Tail Gas Analyzer Class I, Division 2...

  • Page 43: Installing The Demister

    Installing the Demister The demister is a white insulated assembly (Figure 3-3). The sample goes through the demister at a lower temperature than the rest of the oven. If there are droplets of sulfur in the sample stream, they will condense and fall away from the sample.
  • Page 44 Remove handle of the steam-jacketed main sample ball valve to en- sure valve cannot be closed while the sample probe is in place. Secure handle nearby so that it is available when needed. 3-12 | Model 888 Tail Gas Analyzer Class I, Division 2...

  • Page 45: Electrical Connections

    The AC source must be single-phase, grounded-neutral type. Figure 3-4a. Customer Connection Enclosure. The 888 Analyzer is considered outdoor, permanently connected and stationary equipment. It is supplied, as ordered by the customer, configured as either a 120 VAC or a 240 VAC unit and contains voltage- dependent subassemblies.
  • Page 46 Specifications section (Chapter 2) for customer signal input voltage and current restrictions. A separate junction box may be re- quired if the signal cables are too large for the cable glands provided. 3-14 | Model 888 Tail Gas Analyzer Class I, Division 2...

  • Page 47: System Start-Up And Operation

    System Start-Up and Operation Leak Checking Before power is applied and before the sample inlet valve is opened to the process gas stream, it is necessary to ensure that no leaks are present in the sample system. It is recommended that the sample system be leak checked after any maintenance or modifications.

  • Page 48: System Operation

    If the password has timed out, the user will be prompted to log in again. Password Levels There are two levels of passwords to ensure the security of the Model 888. Level 1 Password Level 1 password is “2222” and allows the user to access all of the func- tions available in the Actions, Configure and some of the Diagnose menu screens.
  • Page 49 oven enclosure. Verify that the electronics enclosure and detector enclosure doors are closed and properly secured. Apply AC power and note controller display screen activity. Figures 3-6a . Start-up and Configuration Pressures screen. The analyzer will start in Period 1, Special Flush, and will step to Period 2, Flush &...

  • Page 50: Setting The Sample Gas Flow

    Figure 3-7d. Configuration Screen. Locate the aspirator regulator pressure gauge (bottom regulator in drawing). Set the aspirator regulator pressure until the gauge reads approximately 10 PSI above the process pressure. 3-18 | Model 888 Tail Gas Analyzer Class I, Division 2...
  • Page 51 Make sure the Aspirator Overide is in the NO position. Neutral, de-activated position Check that the flow setpoint is set to 1.5. The analyser will now regulate sample flow automatically in Period 4 (Measure). Press the “X” key to exit to the previous screen Figure 3-8). Figure 3-8.

  • Page 52: Analyzer Timing

    Analyzer Timing All Model 888 analyzer functions are broken down into 14 timing periods. See Logic Table below. • Periods 1 - 4 are the normal Sample cycle and Zero cycle periods. • Periods 1 - 11 are fully programmable and are run for a length of time in seconds.

  • Page 53: Normal Timing Sequence

    Normal Timing Sequence The Logic Table shows the sequential timing periods 1 through 14. When power is first applied, the controller starts at Period 1 and cycles through to Period 4, the Sample Tracking period. Sample tracking continues indefi- nitely until one of the following events occurs: When the Zero Timer times out, normally a Zero Cycle is started im- mediately, but when the option is available, a Steam Blow Back Cycle can also be started.
  • Page 54 Interval to a value less than 16 or run the cycle more than once a day. If your analyzer requires steam blowback to run more than once a day, please contact the Ametek Service Department. WARNING This page intentionally left blank. 3-22 | Model 888 Tail Gas Analyzer Class I, Division 2...

  • Page 55: Calibration Span Adjustment

    Calibration Span Adjustment The Model 888 has an optional calibration span adjustment that is per- formed manually. Use cylinders of H S and SO of known concentrations to validate and/or adjust the calibration of the analyzer. Potentially lethal concentrations of toxic gases such as hydrogen...
  • Page 56 Activate Period 13 “Continuous Hold ” by navigating to the option. It will visibly brighten to indicate that it has been selected. Press the ENTER key to activate the continuous hold. The gold side of 3-24 | Model 888 Tail Gas Analyzer Class I, Division 2...
  • Page 57 the slider will move to the right to indicate that the hold is activated. Open the valve on the calibration gas source. 10. Wait for the H S or SO concentration reading on the menu screen to stabilize. 11. Calculate a new value for the H S or SO span factor.

  • Page 58: Analyzer Troubleshooting And Maintenance

    If it is necessary to open the analyzer’s covers or doors while the cir- cuits are live, first monitor the area for flammable gases and proceed only when the area is safe. WARNING 3-26 | Model 888 Tail Gas Analyzer Class I, Division 2...
  • Page 59 Hazardous voltages are present inside. If a procedure for a certain maintenance task is not described in the ana- lyzer User Manual, contact AMETEK Service Personnel for details about performing the required maintenance. When performing equipment maintenance in hazardous areas, all...

  • Page 60: Sample System Leakage Test

    The pressure must not drop more than 1 PSIG over this time period. OVEN Test Gauge Valve A 50 PSIG Demister Instrument Air Cal Gas Inlet Sample Return Sample Inlet Demister Vent Figure 3-12. Sample System Leak Test 3-28 | Model 888 Tail Gas Analyzer Class I, Division 2...

  • Page 61: Chapter 4 Controller / User Interface

    CONTROLLER/USER INTERFACE Refer to 883056904 User Interface Manual for details on the AMEVision interface. Controller/User Interface...
  • Page 62 This page intentionally left blank. 4-2 | Model 888 Class 1, Division 2 Tail Gas Analyzer...

  • Page 63: Chapter 5 Alarms

    Alarm Relays There are four (4) alarm relays maintained by the analyzer. All relays are failsafe; this means that an open contact indicates a problem. • Relay 1 is dedicated as a System Alarm • Relay 2 is dedicated as a Data Valid Alarm. •...

  • Page 64: Alarm Conditions And Responses

    • Level 4: This is a user configurable alarm. Relay 3 or Relay 4 may change state. Refer to the 888 User Interface Manual for instructions on how to set up programmable relays. 5-2 | Model 888 Class I, Division 2 Tail Gas Analyzer...
  • Page 65 Level 1 Alarms The analyzer has an internal 1 second clock to time the state Alarm Timer Stopped machine periods. This timer can be disabled via the service menu. The alarm will persist until the timer is enabled. The cell temperature is below its lower limit. Low cell tem- Cell Temperature Alarm perature may cause Sulfur mist to condense onto the optical surfaces.
  • Page 66 This is a indicates that there is a cold spot at the flange that Flange Temperature Alarm may lead to a plugging condition. The 888 varies the number of flashes for each detector to ensure adequate light levels at each photodiode. A high flash High Flash Count Warning count usually indicates that optical surfaces need cleaning.

  • Page 67: Chapter 6 Troubleshooting

    TROUBLESHOOTING Diagnostic Functions The Model 888 includes a number of diagnostic functions that can be accessed through the user interface. Refer to the Diagnose menus in the User Interface manual (883056904) for a more detailed description. These diagnostics can be used to test analog outputs, relay operation, solenoid valve operation, proportional valve operation, lamp functionality, and detector operation.

  • Page 68: Problems And Possible Causes

    • Check the active alarms for a RTD failure alarm. An open or shorted RTD will be displayed as 999 °C on the Config- ure_Status menu. 6-2 | Model 888 Tail Gas Analyzer Class I, Division 2...

  • Page 69: Low Light Conditions

    Low Light Conditions The Xenon Flash Lamp emits ultraviolet light. Never look directly into the lamp while it is flashing CAUTION A low light alarm indicates a possible issue with the Xenon Lamp or an obstruction in the optical pathway. An obstruction can be caused by de- posits on the optical surfaces or by a mechanical misalignment.

  • Page 70: Cleaning The Optical Surface

    • In the oven enclosure, check that all hardware securing the mirror block is tight. Hot surfaces are present in the oven enclosure. WARNING 6-4 | Model 888 Tail Gas Analyzer Class I, Division 2...

  • Page 71: Chapter 7 Parts Replacement

    PARTS REPLACEMENT Do not open the enclosure door unless the area is known to be free of hazardous gases. Units with purge controllers need to be programmed for Bypass to power the electronics. CAUTION There are hazardous voltages inside the electronics enclosure. Only a qualified technician should work on the analyzer while it is powered CAUTION There are hot surfaces present in the oven enclosure.

  • Page 72: Part Numbers

    Pressure Transmitter 273415001 Solid State Relay 273291001 (4) Proportional Valve 273408001 Manifold Valve 3-way 301-0424 24 Volt Power Supply 273524001 Heater (120 V models) 883024901 Heater( 230 V models) 883024902 7-2 | Model 888 Tail Gas Analyzer Class I, Division 2...
  • Page 73 Cell Assembly (High Purge) 883034902 Cell Assembly (Low Purge) 883034901 Conax Gland Seal 200859002 ◙ Sample Cell 880042001 200887001 880042001 Figure 7-1 Sample Cell - 883034901 (Standard Range) - 883034902 (High Range) Parts Replacement...
  • Page 74 Mirror Block 883074002 880042001 Figure 7-2 Mirror Block - 883023902 7-4 | Model 888 Tail Gas Analyzer Class I, Division 2...
  • Page 75 Electronics Enclosure Interior Figure 7-3 Electronics Enclosure Interior Parts Replacement...
  • Page 76 Amevision Electronic Assembly 8000-122-SE 301-0382 Figure 7-4. 8000-122 SE Circuit Assembly 7-6 | Model 888 Tail Gas Analyzer Class I, Division 2...
  • Page 77 LCD Display Detail 1000-701-JE Display Cable 1000-617-JE LCD Display 8000-122-SE Figure 7-5. Display and Cable. Parts Replacement...
  • Page 78 Keypad 273398001 Keypad Figure 7-6. Keypad - 273398001 7-8 | Model 888 Tail Gas Analyzer Class I, Division 2...
  • Page 79 Sensor Board Figure 7-7. Sensor Electronic Assembly - 883047901 Parts Replacement...
  • Page 80 Detector Board Figure 7-8. Detector Board - 883048901 7-10 | Model 888 Tail Gas Analyzer Class I, Division 2...
  • Page 81 DC/DC Converter Assembly Figure 7-9. DC/DC Converter Assembly - 883049901 Parts Replacement 7-11...
  • Page 82 Lamp Power Supply Figure 7-10. Lamp Power Assembly 100-2061 7-12 | Model 888 Tail Gas Analyzer Class I, Division 2...
  • Page 83 Sample Oven Enclosure - Interior 883026901 Demister 407300902 Aspirator 271446001 Sample Inlet Valve 883024901 or 883024902 Heater (120 Vac or 240 Vac) 273383001 Sample Return Valve Figure 7-11. Sample Oven Components Parts Replacement 7-13...
  • Page 84 Manifold Block Detail Figure 7-12. Pilot Valve Locations 7-14 | Model 888 Tail Gas Analyzer Class I, Division 2...
  • Page 85 Flange RTD Figure 7-13. Flange Formed RTD - 883095002 Cell RTD Figure 7-14. Sample Cell Formed RTD - 883095001 Demister RTD Figure 7-15. Demister RTD - 273402001 Parts Replacement 7-15...
  • Page 86 Fuses 301-0862 301-0860 25780JE 4 Amp 1 Amp 5 Amp Heater Electronics Main 203429001 Varistor (3 plcs) Figure 7-16. AC Terminals inside Electronics Enclosure 7-16 | Model 888 Tail Gas Analyzer Class I, Division 2...

  • Page 87: Appendix A Wiring Diagrams

    WIRING DIAGRAMS This appendix contains the wiring diagrams for all the standard and op- tional models of the Model 888 Class I, Division 2 Tail Gas Analyzer. Wiring Diagrams Appendix A-1...
  • Page 88 Fig. A-2 DIVISION 2 STANDARD RANGE Appendix A-2 | Model 888 Tail Gas Analyzer Class I, Division 2...
  • Page 89 Fig. A-3 DIVISION 2 HIGH RANGE Wiring Diagrams Appendix A-3...
  • Page 90 Fig. A-4 DIVISION 2 PIT GAS Appendix A-4 | Model 888 Tail Gas Analyzer Class I, Division 2...
  • Page 91 Fig. A-5-1 WIRING DIAGRAM Wiring Diagrams Appendix A-5...
  • Page 92 Fig. A-5-2 WIRING DIAGRAM Appendix A-6 | Model 888 Tail Gas Analyzer Class I, Division 2...
  • Page 93 Fig. A-5-3 WIRING DIAGRAM Wiring Diagrams Appendix A-7...
  • Page 94 Fig. A-5-4 WIRING DIAGRAM Appendix A-8 | Model 888 Tail Gas Analyzer Class I, Division 2...
  • Page 95 Fig. A-5-5 WIRING DIAGRAM CUSTOMER CONNECTIONS Wiring Diagrams Appendix A-9...
  • Page 96 Fig. A-5-6 WIRING DIAGRAM Appendix A-10 | Model 888 Tail Gas Analyzer Class I, Division 2...

  • Page 97: Appendix B H 2 S And So 2 Calculations

    S AND SO CALCULATIONS Concentration Measurement There are four detectors and bandpass filters used to measure the concen- tration of H S and SO . The signal from each of the detectors is measured by individual analog-to-digital converters and those values are used to calculate concentration.
  • Page 98 S + SO + 2 H The Model 888 can provide an analog output that can be used to regulate the amount of air needed by the reaction furnace to produce the correct ratio of H S to SO...
  • Page 99 Claus Process, i.e Plant Factor = acid gas acid gas Air demand is defined as -∆A. The equation implemented by the Model 888 is shown below: = d {plant factor(Process ratio [SO Air Demand ] - [H S] ) - Excess Air} The configuration parameters can be found in Chapter 4 in the Config- ure _Calibration_Special Values menu.
  • Page 100 This page intentionally left blank. Appendix B-4 | Model 888 Tail Gas Analyzer Class I, Division 2...

  • Page 101: Appendix C Analyzer Timing

    ANALYZER TIMING Timing States / Periods The Model 888 uses a state machine of 14 states to control the operation of the analyzer. These fourteen states are referred to as “periods” in the user manual. Timers are responsible for many of the events that cause state transitions.

  • Page 102: Period 3 - Sample Flush

    Once time in Period 8 elapses, the period will continue either revert to Period 3 or continue to Period 9. Only analyzers equipped with the steam blowback option, can be con- figured to advance to Period 9. Appendix C-2 | Model 888 Tail Gas Analyzer Class I, Division 2...

  • Page 103: Operation Sequences

    Operation Sequences Zero Calibration Period 5 →Period 6→Period 3 Photo-Span Calibration (not configured for steam blowback period) Period 5→Period 6 →Period 7→Period 8→Period 3 Photo-Span Calibration (configured for a steam blowback period) Period 5→Period 6→Period 7→Period 8→Period 9→Period 10→Period 11→Period 5 Period 5 –...

  • Page 104: Period 8 - Track Photo-Span Calibration

    Period 10 once the timer elapses. Period 11 – Post Steam Flush The sample system is flushed by instrument air during this period. The analyzer reverts to Period 5 once the timer elapses. Appendix C-4 | Model 888 Tail Gas Analyzer Class I, Division 2...

  • Page 105: Special Periods

    Special Periods There are three special periods (12, 13, and 14) used for troubleshooting. The data valid contact will be open and the analog outputs held at their last valid value during Periods 12 through 14. Period 12 – Continuous Flush The sample system is continuously flushed by instrument air during this period.
  • Page 106 This page intentionally left blank. Appendix C-6 | Model 888 Tail Gas Analyzer Class I, Division 2...

  • Page 107: Appendix D Parameter Ids / Modbus Addresses

    PARAMETER IDS / MODBUS ADDRESSES Parameter IDs & Modbus Addresses Appendix D-1...
  • Page 108 Appendix D-2 | Model 888 Div 2 Tail Gas Analyzer...
  • Page 109 Parameter IDs & Modbus Addresses Appendix D-3...
  • Page 110 Appendix D-4 | Model 888 Div 2 Tail Gas Analyzer...
  • Page 111 Parameter IDs & Modbus Addresses Appendix D-5...
  • Page 112 Appendix D-6 | Model 888 Div 2 Tail Gas Analyzer...
  • Page 113 ALARMS Alarm Severity Level 1 Alarms This is the highest level or severity of alarm. A Level 1 alarm indicates either a hardware failure or a system error that prevents the analyzer from making a valid H S or SO concentration measurement.
  • Page 114 Excessive Flash Warning indicating that the light intensity is dropping • Low Flange Temperature warning indicating the possibility of a blockage • Detector Temperature alarm indicating that the accuracy of the con- centration measurements may be affected. E-2 | Model 888 Tail Gas Analyzer Class 1, Division 2...
  • Page 115 Level 4 Alarms A Level 4 alarm is a programmable alarm. There are two programmable alarms provided. These alarms can be mapped to a parameter via the local display interface. Alarm operation can be selected to be normally open or normally closed.
  • Page 116 This page intentionally left blank. E-4 | Model 888 Tail Gas Analyzer Class 1, Division 2...
  • Page 117 Low Light Alarm [3] The Model 888 analyzer adjusts light intensity automatically by chang- ing the number of lamp flashes per second. If the optical surfaces slowly become fouled, the number of flashes per second is increased to maintain light intensity on the detectors.
  • Page 118 Causes for this condition could be a defective solid state relay or excessive cooling air flow. The alarm will clear itself once the temperature is in range. E-6 | Model 888 Tail Gas Analyzer Class 1, Division 2...
  • Page 119 Cell Flow Alarm [7] The Model 888 analyzers regulate sample flow by adjusting a proportional valve in the aspirator drive air. Ideally, the sample flow rate is approxi- mately 1.5 SLPM. If the proportional valve reaches its maximum or mini- mum control range and the flow is incorrect, a Level 2 alarm occurs.
  • Page 120 There are two redundant sensors in the heater. User intervention is needed to clear the alarm condition. The RTD could be defective or one of the three RTD wires may have been disconnected. E-8 | Model 888 Tail Gas Analyzer Class 1, Division 2...
  • Page 121 RTD wires may have been disconnected. Manifold Pressure Alarm [15] The Model 888 analyzer uses pneumatic control valves. The software monitors the manifold pressure for these valves. The manifold pressure alarm occurs if the pressure drops below the minimum operating pressure for the valves.
  • Page 122 This alarm is cleared by raising the temperature of the flange. Check the insulation around the external ball valve and make sure there is sufficient heat applied to the ball valve. E-10 | Model 888 Tail Gas Analyzer Class 1, Division 2...

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