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Adjustment of alarm holding function, Closing down – M&C TechGroup LA 1.4 Operator's manual User Manual

Page 19

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19

Gas sampling and conditioning technology

5-5.1.1-ME

Range of adjustment on the electronic controllers: 50µS/cm … 1mS/cm.
For an adjustment of sensitivity, the following steps have to be executed:

Remove the 4 lid screws of the electronic controller LA-1.1 and remove the lid.

Dismount the sensor, clean and dry the electrodes.

In case of permanent alarm with a dry and clean sensor: Turn on the potentiometer P1 (LA-
1.1) resp. Sensitivity adj. (LA-1.4) anticlockwise (lower sensitivity) until the alarm is out. Then
make a short-circuit with a humid finger. Then, the electronic controller LA-1.. must
immediately indicate alarm, i.e. the red LED must be beaming.

In case the alarm is not activated while making the short-circuit of the sensor electrodes
with a humid finger:
Turn on the potentiometer P1 (LA-1.1) resp. Sensitivity adj. (LA-1.4) in
clockwise direction (higher sensitivity) until the alarm is indicated, i.e. the red LED is beaming.

Screw again the 4 lid screws of the electronic controller LA-1.1.

Dry the electrodes with a cloth and mount the sensor again.

N O T E !

Should there be condensate with a low conducting capacity, do not short-
circuit the sensor. Moisten instead the sensor (that has be cleaned with
distilled water) with the respective condensate.


14.4

ADJUSTMENT OF ALARM HOLDING FUNCTION

Optionally, you can configure a self-holding of the alarm. For this purpose, you have to execute a
manual reset in the event of an alarm.
For configuration of the alarm holding function, you have to execute the following steps:

Remove first the 4 lid screws and then the lid of the electronic controller LA-1.1.

For the rail mounting version LA-1.4, loosen the above and below closing behind the terminals
by means of a screw driver. Then pull the printed board together with the housing front out of
the back housing part.

Plug the jumper on JP1 from position: 2-3 (no alarm memory function) to position 1-2 (see
figure 4 resp. 6).

Screw the lid again on electronic controller LA-1.1.

Push the printed board again into the housing of electronic controller LA-1.4.


The manual reset has to be released on the electronic controllers LA 1.1 and LA1.4 by actuating the
key button S1 resp. Al. Reset. In case of the electronic controller LA 1.1, you have to remover the
housing lid for this purpose (see figure 4). In case of electronic controller LA 1.4, you have to actuate
the key button in the housing front (Al. Reset).



15

CLOSING DOWN

No special measures have to be respected for closing down.