E2632
Rev 17.05.2021
If the gas concentration for each sensor exceeds the LOW alarm setpoint, the bottom red
LED of that sensor starts flashing at a rate of 1 Hz, and the relay RE1 switches over. The
first alarm stops automatically if the gas concentration drops below 80% of the LOW alarm
setpoint.
If the gas level exceeds the HIGH alarm setpoint, the bottom red LED of that sensor starts
flashing and the buzzer starts beeping at a rate of 2 Hz, and also the relay RE2 switches
over. Depending on the selected release mode, the HIGH alarm stops automatically or can
be stopped with a short touch of the magnet key, if the gas level has dropped below 80% of
the LOW alarm setpoint. Upon contact, the key should activate the reed switch located left
of the sensor inside the device.
Apart from the warming-up period, a 2....10 s touch causes the device to reset and perform
the self-diagnostic routine for testing purposes. To check the visual and acoustic alarm,
touch the device with the magnet key for more than 10 s. This will launch blinking and
beeping (stops as soon as the key is withdrawn).
Sensor probe handling
The sensor probes of all types are equipped with a hydrophobic microporous PTFE filter to
protect the sensor from dust, dirt, and water drops. The filter may be replaced if it gets
strongly contaminated. To replace the PTFE filter, unscrew the M25 nut and remove the old
filter. Place a new filter into the nut and tighten it again.
NOTE! Never stab or press the filter near its center where the sensor is located since this
may damage the sensor. Do not remove the filter as it may cause the device to show
incorrect values.
The recommended orientation of the sensor probes is vertical with the sensor tips pointing
downwards. This prevents the possible accumulation of condensed water on the sensor
protection filter.
The electrochemical gas sensor replacement procedures
1.
Un-power detector;
2.
Unscrew sensor head cap;
3.
Carefully take out the sensor cell;
4.
Disconnect the first wire from the old sensor and connect to the same pin on the
new sensor;
5.
Disconnect the second wire from the old sensor and connect to the second pin on
the new sensor;
6.
Insert the new sensor into the sensor head and screw back the sensor head cap.
10
