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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

TQ TQ4000 User Manual

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