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1、Mar 02 Page i of iv 59812-120GRAVINERMk 6 OIL MIST DETECTORINSTALLATION, OPERATION ANDMAINTENANCEMANUAL59812-120PROPRIETARY RIGHTS NOTICEThe information contained in this manual is the property of Kidde Fire Protection Services Limited and may notbe reproduced or transmitted in any form or by any me
2、ans, electronic, mechanical, photocopying, recording orotherwise, nor stored in any retrieval system of any nature without the express written authority of Kidde FireProtection Services Limited. Copyright 2002 Kidde Fire Protection Services LtdTABLE OF CONTENTSChapter PageMar 02 Page ii of iv 59812-
3、1201.0 DESCRIPTION AND OPERATION 11.1 INTRODUCTION 11.2 PRINCIPLE 11.3 DESCRIPTION 11.4 OPERATION 31.5 SYSTEM FUNCTION, CONTROLS AND DISPLAYS 42.0 INSTALLATION AND COMMISSIONING 62.1 INSTALLATION 62.2 SYSTEM CHECKS PRIOR TO SWITCHING ON 92.3 SYSTEM CONFIGURATION AND COMMISSIONING 92.4 SYSTEM OPERATI
4、ON 222.5 SYSTEM TEST 252.6 DATA EVENT AND HISTORY LOGS 293.0 MAINTENANCE 313.1 ROUTINE MAINTENANCE 313.2 DETECTOR REPLACEMENT 323.3 DETECTOR REFURBISHMENT 323.4 FAN REPLACEMENT 323.5 CABLE REPLACEMENT 333.6 CONTROL UNIT PCBs 343.7 REPLACEMENT OF 8 ENGINE STATUS DISPLAY MEMBRANE 353.8 REPLACEMENT OF
5、LCD DISPLAY 353.9 REPLACEMENT OF LCD DISPLAY MEMBRANE 353.10 DECOMMISSIONING 354.0 FAULT FINDING 414.1 GENERAL 41TABLE OF CONTENTSChapter Page5.0 DATA 49Mar 02 Page iii of iv 59812-1205.1 LEADING PARTICULARS 496.0 SPARE PARTS 51APPENDICESCOMMISSIONING KIT Appendix ASERVICE KIT Appendix BINSTALLATION
6、 AND WIRING DIAGRAMS Appendix CLIST OF ILLUSTRATIONSFigure Title Page1 View of Mk 6 OMD Control Unit 22 Oil Mist Detection System 33 Display and Controls 54 Bezel 35100-K187 75 Junction Box External Connections Label 86 Control Unit External Connections Label 107 OMD Engineer Menu Schematic 138 Dete
7、ctor Head E3561-301 209 Interface PCB 3610 Main Control Processor PCB 3711 8 Engine Status Display PCB 3812 Status Display PCB 3913 Junction Box PCB 4014 Junction Box 5115 Detector Head E3561-301 5216 Mk 6 Oil Mist Detector Control Unit 53 Mar 02 Page iv of iv 59812-120Intentionally BlankCHAPTER 1DE
8、SCRIPTION AND OPERATIONMar 02 Page 1 of 56 59812-1201.1 INTRODUCTIONThis manual covers the Mk 6 Oil Mist Detector (OMD). High temperatures, in excess of 200 deg C thatoccur on bearing surfaces under initial failure conditions, can lead to a rapid generation of oil vapour.When the hot vapour contacts
9、 the relatively cooler atmosphere of the crankcase it condenses into afine mist, with typical particle sizes of around 0.5 to 5 microns in diameter. When the density of theseparticles reaches between 30 to 50 mg/litre (depending upon the type of oil) an explosive conditionexists. Using optical measu
10、ring techniques, oil mist density can be measured at levels as low as 0.05mg/litre. Oil Mist Detection techniques have been used to monitor diesel engine crankcases for potentialexplosive conditions and early detection of bearing failures. The systems available rely mainly onanalysing the optical de
11、nsity of oil mist samples drawn from the crankcase compartments, throughpipes to the detector. While these systems proved successful in the past, engine design has improvedsignificantly over the years and oil mist detection techniques have improved substantially to maintainadequate protection. The M
12、k 6 OMD provides the following design improvements:Elimination of sample pipesSignificant reduction in scanning timeRelocating system controls and display to the control roomMulti engine capability1.2 PRINCIPLEThe Graviner Mk 6 OMD (Figure 1) retains the differential measuring system long establishe
13、d byGraviner and unique to Graviner, which enables high sensitivity to be used while maintaining themaximum false alarm rejection. It still uses optical sensing, but light scatter instead of obscuration.This enables very small detectors to be used. These are rugged and are designed to be enginemount
14、ed using standard oil mist detector ports. As they each have their own means of sampleacquisition no sample pipes are required. Multiple internal light sources ensure that a single failure willnot cause the loss of a detector. Modular construction means that a faulty detector can be replaced ina mat
15、ter of minutes.1.3 DESCRIPTION (Refer to Figure 2)The Graviner Mark 6 OMD system can comprise up to 64 detectors directly mounted on thecrankcases of up to 8 engines. A full system has a scan time of 1.2 seconds but with alarm prioritiesthat enable the system to respond to an alarm as it occurs. Eac
16、h detector has a cable connecting it directly to an engine mounted junction box, which is in turnconnected by two cables to the control/display unit in the control room or other appropriate location.The system uses digital data transmission technology which means all system displays and controlsare located on the control unit which is designed to be mounted within the Engine Control Room. Thiseliminates the need to enter the machinery space in alarm condition
