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QuadGard Installation and Operating Manual. Issue 5. January 1996 Page i
CONTENTS
0. ABOUT THIS MANUAL.............................................................................................................1
0.1 Scope of this manual.....................................................................................................1
0.2 Changes in issue 5.........................................................................................................1
1. INTRODUCTION TO QuadGard.................................................................................................2
1.1 Intended use................................................................................................................... 2
1.2 Description .................................................................................................................... 2
2. FACILITIES AND CONFIGURATION.......................................................................................3
2.1 Display..........................................................................................................................3
2.1.1 Display during power-up..............................................................................3
2.2 Indicators and controls...................................................................................................4
2.3 Alarm outputs................................................................................................................6
2.3.1 Alarm inhibit on power-up............................................................................6
2.3.2 Alarm levels..................................................................................................6
2.3.3 Rising/falling alarms.....................................................................................7
2.3.4 Third alarm relay...........................................................................................7
2.3.5 Master alarms................................................................................................ 7
2.3.6 Manually testing alarm relays ....................................................................... 7
2.3.7 Disabling alarm relays .................................................................................. 7
2.3.8 Alarm hysteresis............................................................................................7
2.4 Under-range, over-range and loop fault alarms ............................................................. 8
2.4.1 Under-range alarm ........................................................................................ 8
2.4.2 Over-range alarm .......................................................................................... 8
2.4.3 Loop faults (SE Ex channels only)................................................................ 8
2.5 Internal Sounder............................................................................................................9
2.6 Analogue output............................................................................................................9
2.6.1 Trimming analogue output............................................................................ 9
2.6.2 Manually controlling analogue output..........................................................9
2.7 Gas names...................................................................................................................... 9
2.8 Measurement units....................................................................................................... 10
2.9 Measurement ranges....................................................................................................10
2.10 User defined gas name and measurement units ......................................................... 10
2.11 Zero and span adjustment.......................................................................................... 10
2.11.1 4-20 channels...........................................................................................10
2.11.2 SE Ex channels.........................................................................................10
2.12 Zero drift band...........................................................................................................11
2.13 Over-range latching ................................................................................................... 11
2.14 Remote Reset.............................................................................................................11
2.15 Turning off the display..............................................................................................11
2.16 Polytron heads calibration signal...............................................................................11
3. INSTALLATION........................................................................................................................ 12
3.1 Power supplies............................................................................................................. 12
3.1.1 Mains supply............................................................................................... 12
3.1.2 DC supply...................................................................................................12
3.1.3 Fuses ........................................................................................................... 12
3.2 Standby batteries ......................................................................................................... 13
3.3 Connecting measuring heads ....................................................................................... 13
3.3.1 Cable types.................................................................................................. 13
3.3.2 Loop resistance and maximum cable length ............................................... 13
3.3.3 Zener barriers and earthing ......................................................................... 13
3.4 Relays, remote Reset and analogue output connections..............................................13
4. SYSTEM SET-UP AND CALIBRATION..................................................................................14
4.1 Preparation................................................................................................................... 14
4.2 Set head current........................................................................................................... 14
4.3 Set range, gas name and measurement units................................................................ 15