TABLE OF CONTENTS
Page III © 1998 DH Instruments, Inc.
5. MAINTENANCE, ADJUSTMENTS AND CALIBRATION ............ 75
5.1 MAINTENANCE .....................................................................................................................................75
5.1.1 PNEUMATIC CONTROL MODULE CONFIGURATION........................................................................... 75
5.1.2 REPAIRS................................................................................................................................................. 76
5.1.2.1 FUSE REMOVAL AND REPLACEMENT ............................................................................................. 76
5.1.2.2 FRONT PANEL REMOVAL AND REPLACEMENT.............................................................................. 77
5.1.2.3 DISPLAY REMOVAL AND REPLACEMENT........................................................................................ 77
5.1.2.4 REAR FITTING REMOVAL AND REPLACEMENT.............................................................................. 78
5.1.2.5 POWER SUPPLY REMOVAL.............................................................................................................. 78
5.1.2.6 BAROMETER BOARD REPLACEMENT ............................................................................................. 79
5.1.2.7 COOLING FAN REMOVAL AND REPLACEMENT .............................................................................. 79
5.1.2.8 SUPPLY PRESSURE RELIEF VALVE REMOVAL AND REPLACEMENT .......................................... 80
5.1.2.9 RELOADING EMBEDDED SOFTWARE INTO FLASH MEMORY ....................................................... 80
5.1.3 OVERHAUL............................................................................................................................................. 80
5.1.4 SELF PURGING LIQUID TRAP (SPLT) .................................................................................................. 81
5.1.4.1 MAINTENANCE................................................................................................................................... 81
5.1.4.2 REPAIR ............................................................................................................................................... 81
5.1.4.3 OVERHAUL ......................................................................................................................................... 81
5.1.5 ILLUSTRATED PARTS BREAKDOWN ................................................................................................... 82
5.1.5.1 PARTS LISTS...................................................................................................................................... 82
5.1.5.2 FIGURES............................................................................................................................................. 87
5.2 AUTOZERO OF REFERENCE TRANSDUCERS ..................................................................................99
5.2.1 HI REF (BY COMP AT ATM) ..................................................................................................................100
5.2.2 LO REF (BY VACUUM) ..........................................................................................................................102
5.2.3 VIEWING AND EDITING AUTOZERO VALUES.....................................................................................105
5.3 ADJUSTMENT OF BAROMETER .......................................................................................................106
5.4 CALIBRATION OF REFERENCE TRANSDUCERS............................................................................107
5.4.1 PRINCIPLE.............................................................................................................................................107
5.4.2 EQUIPMENT REQUIRED.......................................................................................................................109
5.4.3 SET-UP AND PREPARATION................................................................................................................109
5.4.4 ON-BOARD REFERENCE TRANSDUCER CALIBRATION FUNCTION ................................................110
5.4.4.1 OVERVIEW ........................................................................................................................................110
5.4.4.2 SELECTION OF REFERENCE TRANSDUCER (HI, LO) TO CALIBRATE .........................................111
5.4.4.3 SELECTION OF RANGE TO CALIBRATE AND ASSIGNMENT OF PA/PM.......................................111
5.4.4.4 RUNNING THE CALIBRATION OF A RANGE....................................................................................112
5.4.4.5 SETTING PA(Z)TARE.........................................................................................................................114
5.4.4.6 PREVIEWING CALIBRATION DATA..................................................................................................114
5.4.4.7 ACTIVATING CALIBRATION RESULTS.............................................................................................115
5.4.5 THE REFERENCE PRESSURE TRANSDUCERS CAN BE CALIBRATED WITHOUT USING THE ON-
BOARD CALIBRATION FUNCTION. THIS REQUIRES: .......................................................................115
5.4.6 VIEWING REFERENCE TRANSDUCER CALIBRATION INFORMATION .............................................116
5.5 DIAGNOSTIC FUNCTION ...................................................................................................................117
5.5.1 MODE.....................................................................................................................................................117
5.5.2 CALIB.....................................................................................................................................................119
5.5.2.1 DUCER ...............................................................................................................................................119
5.5.2.2 TBASE................................................................................................................................................119
5.5.2.3 TEMP..................................................................................................................................................119
5.5.3 DISP .......................................................................................................................................................119
5.5.4 RELAY....................................................................................................................................................120
5.5.4.1 AMBIENT............................................................................................................................................120
5.5.4.2 ANALOGOPT......................................................................................................................................120
5.5.5 VALVE....................................................................................................................................................120
5.5.6 TEST.......................................................................................................................................................120
5.5.7 LOG........................................................................................................................................................120
6. TROUBLESHOOTING...................................................... 121
7. PREPARTION FOR SHIPMENT OR LONG TERM STORAGE
. 125
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