CTM21 Control units for one sensor

Gas control unit for 1 sensor.
It is equipped with 2 gas detection thresholds and activates the 2 relays when the corresponding alarm thresholds are exceeded, plus 1 fault relay.
The gas concentration is displayed through bar graph indicators.
The second threshold is deliberately time-delayed (30 seconds) upon activation to avoid false alarms caused by a temporary presence of gas (purging).

This control unit is also equipped with a “TEST” button, which allows verification of the system’s operation, and a “RESET” button, which resets the second threshold relay, which is latched.

The “TEST” button checks the electrical operation of the system. Any faults are indicated by the yellow LED and transmitted via relay.