Page 6 of 27 Filename: 7970H8
3.1 Setting the Flammable Gas Sensor Head Voltage ............................................................... 17
3.2 Setting the Sensor Zero ...................................................................................................... 17
4. CALIBRATION AND SETUP ............................................................................. 19
4.1 Zero Adjustment ................................................................................................................ 19
4.2 Span Adjustment ................................................................................................................ 19
5. FRONT PANEL WARNING LED’S AND BUTTONS ............................................. 20
5.1 Front Panel Warning Lamps................................................................................................ 20
5.2 Front Panel Button Functions ............................................................................................. 20
5.2.1 Reset .................................................................................................................................... 20
5.2.2 Mute .................................................................................................................................... 21
5.2.3 Hold ..................................................................................................................................... 21
5.2.4 Lamp Test ............................................................................................................................ 21
5.2.5 Dimmer ............................................................................................................................... 21
6. SELF TEST FACILITIES ..................................................................................... 22
7. FAULT FINDING............................................................................................. 23
7.1 Unit does not power up ...................................................................................................... 23
7.2 Flammable gas sensors will not go to zero on setup ........................................................... 23
7.3 Flammable gas sensor when gassed do not span high enough ........................................... 23
7.4 Flammable gas sensor moves erratically when gassed ....................................................... 23
7.5 Display is cycling from 0 to end of scale and alarms are sounding ...................................... 23
7.6 Relays fail to activate on alarm .......................................................................................... 23
8. SENSOR INFORMATION ................................................................................ 24
8.1 Flammable Sensors ............................................................................................................ 24
8.2 Toxic Sensors ...................................................................................................................... 24
8.3 Infra-red and other 3-wire 4-20mA Sensors ........................................................................ 24
9. MODBUS COMMUNICATIONS ....................................................................... 25
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