TS4000
39
NOTE:
Red LEDs above and below the digital display indicate that the Alarm and Warning
Relays are active. Latching relays can only be reset if the gas concentration has fallen
below their respective relay set points.
4.8 Gas Check Mode
Figure 17: Gas Check
The sensor’s response can be checked without activating external alarms by placing the
TS4000 in Gas Check Mode. In this mode, the alarm relays are inhibited and the analog output
is fixed at 1.5mA.
NOTE:
Gas Check Mode is not accessible when either an O
2
sensor or no sensor is installed
in the TS4000.
4.8.1 Gas Check Procedure
To Run Gas Check Mode for All Sensors Except O
2
1. Apply and hold the magnet over the GM logo on the Base Unit cover. Remove the
magnet when three dashes “
---
” appear in the display window. This action places the
unit into Gas Check Mode.
2. The
“
---
“ flash while the settings are being set to zero.
3. Once the unit has been set to zero, “
gAS
” appears in the display window.
4. Apply the test gas to the sensor, the value of the gas concentration is then indicated by
the flashing display (with readings typically stabilizing within one to two minutes).
5. When the reading has stabilized and the test is complete, remove the gas. When the
gas concentration drops below 5% FS the unit returns to normal operation.
NOTE:
The test gas concentration must be at least 10% FS before the unit can complete the
Gas Check sequence. If the TS4000 is placed in the Gas Check Mode and no gas is
applied within ten minutes, the unit returns to normal operation. If the TS4000 is in Gas
Check Mode and gas is applied longer than ten minutes, the unit will also revert to a
Fault condition. Removing the applied gas will return the TS4000 to normal operation.
4.8.1.1 Ending Gas Check Mode
Gas Check Mode can be ended after the zeroing stage and while the unit is waiting for gas to
be applied. Applying the magnet over the GM logo, after the unit has been zeroed and prior to
gas being applied, will terminate the Gas Check Mode and save the zero settings.
