M&C LA Series, Instruction Manual

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14 COMMISSIONING
14.1 COMMISSIONING WITH A DRY SENSOR
Switch on the mains voltage, the green LED of the electronic controller LA1.1 or LA1.4 lights up.
The liquid alarm control is ready to work!
In case the read alarm LED lights up, there is liquid on the sensor or there is a line break or you must
do an adjustment of the sensitivity (see chapter 14.3).
N O T E !
If the sensor is dry, the green LED indicates that the instrument is in
operating condition, the green LED is off when the red LED lights up
and signalizes a liquid alarm.
14.2 FUNCTION TEST
The response sensitivity of the LA1S and LA25S sensors should be checked during initial
commissioning and then twice a year as follows:
•
Disassemble sensor LA1S or LA25S.
•
Short-circuit the sensor electrodes with a damp finger.
•
The electronic controller LA1.1 or LA1.4 indicates an alarm, i.e. the red LED lights up.
•
After the function test, dry the electrodes with a cloth.
•
Mount the sensor back into the mounting assembly.
For the
LA1S and LA25S sensors, a cable break can be simulated by disconnecting a connection wire
from the electronic controller. Here, too, the electronic controller LA1.1 or LA1.4 must immediately
indicate an alarm, i.e. the LED must light up red.
N O T E !
If the alarm does not respond during the functional test, check the
sensor, electronic controller and connections.
N O T E !
The LA1S sensor can only detect condensate with a conductivity of
20 µS/cm or higher.
It is therefore advisable to check the function of the sensor with the
condensate that may be accumulated. To do this, remove the sensor
and carry out the function test described above with the
corresponding condensate.