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114-OM-100

1915 VOYAGER AVENUE SIMI VALLEY, CA. 93063-3349 TELEPHONE: (805) 584-4100 FAX: (805) 578-1755

SERIES 800 OPERATION AND MAINTENANCE MANUAL

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REVISIONS LTR 8 DESCRIPTION Page ii indicates the pages affected. Ref. EGN-103-95 DATE 3/16/95 AUTHORITY

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3/15/00 9/20/00 1/5/01 8/16/02 3/11/03 11/1103 10/25/04

J.Fuller Project Engineer G. Griffis Q.A. Engineer R. Sanchez MFG. EngineerCode Ident. No. 72152 i

MEGGITT SAFETY SYSTEMS 1915 Voyager Avenue Simi Valley, CA 93063-3349

Series 800 Operations and Maintenance Manual

DOC. NO.: 114OM100

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PAGE REVISI0N STATUS
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 Appendix A Appendix B Appendix C Appendix D

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Revision J isa complete reissue of the manual involving every page.

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DESCRIPTION 1.0 GENERAL SYSTEM DESCRIPTION 1.1 Hydrogen/Oxygen Detector Assembly 1.2 Pressure Transducer 1.3 Signal conditioning unit 1.4 Performance Specification 2.0 THEORY OF OPERATION 2.1General 2.2 Sensor Assembly 2.3 Electronic Assembly SYSTEM INSTALLATION 3.1 General 3.2 Mechanical Installation 3.2.1 Electronics Assembly 113B010, 113B020, 114D106, Appendix A 3.2.2 Hydrogen Detector Assembly 114D038, 114B024 Appendix A 3.2.3 Pressure Transducer Assembly 114A061, Appendix A 3.3 Electrical Installation, 114D118, 114D134, Appendix A 3.3.1 Electronics Assembly 3.3.2 Sample DetectionChamber 3.3.3 Pressure Transducer SYSTEM CALIBRATION 4.1 General 4.2 System Calibration 4.2.1 Basic System Adjustment 4.2.2 Alarm Adjustment 4.2.3 Current Output Adjustment 4.2.4 Pressure Compensation Adjustment SPARE PARTS 5.1 Spare Parts Installation 5.1.1 114D143, Chamber Assy Sensor Replacement 5.1.2 109D031 Hydrogen Sensor Cartridge Assembly

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4.0

5.0

Appendix A - SystemDrawings Appendix B – Vendor Data Sheet Appendix C – Partial Pressure (hydrogen and oxygen) Sensors Appendix D - Procedures

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1.0 GENERAL SYSTEM DESCRIPTION The 800 series monitoring system as shown in Figure 1-1 consists of a pressure transducer, hydrogen or oxygen detector assembly, and a signal conditioning unit.

Figure 1-1 System Block Diagram mVDC signals developed by the detectorand transducer are combined at the signal conditioner to develop analog signals corresponding to the percent by volume of hydrogen or oxygen present in the sample stream. 1.1 Hydrogen/Oxygen Detector Assembly The detector assemblies, 114D143 (high concentrations) or 114D038 (mild environments), consist of a partial pressure sensor mounted in a stainless steel chamber. Sample flows through thechamber past the sensor which then develops a mVDC signal directly proportional to hydrogen or oxygen partial pressure. Electrical interconnect to the conditioner is completed by using standard 2 conductor twisted shielded cable. Sensor output signal will be a nominal 1 mVDC per percent. The non-mild hydrogen sensor is the only exception with an output of 0.5 mVDC percent. 1.2 Pressure Transducer Thetransducer (0-100 psia), 114A061, converts sample stream total pressure into a mVDC analog signal. Electrical interconnect to the conditioner is completed by using two twisted shielded pair, one cable for excitation and the second for the total pressure signal.

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1.3 Signal Conditioning Unit The signal conditioning electronics, 114D106, reside on two printed circuit modules...
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