28
4. Control Unit
• Fluid level exceeds the ‘Alarm’ level
• An audible tone is sounded
• The red ‘Alarm’ LED lights
• The orange ‘Niveau / Level’ LED lights
• Fluid level falls below the ‘Alarm’ level
• Audible tone turns off
• The red ‘Alarm’ LED blinks as a notification that the ‘Alarm’ level has
been exceeded (even if only for a short time)
• The orange LED ‘Nineau / Level’ is off.
Manual activation –
when the system is in normal operation, the
‘Alarm’ button on the control unit can be pressed to test the visual
and audible alarms on the control unit.
4.4 Changing to optical sensor
(
only to be handled by a licensed cer-
tified electrician)
20221 (for non-conductive fluids) if desired. The optical sensor (ac-
cessory which will need to be purchased) and the following changes
will be required:
• Disconnect the control unit from its power source
• Open the control unit cover and disconnect the batteries
• In the upper left hand corner of the control unit, a bridge / jumper
needs to be removed
• Disconnect and remove the electronic probe
Alarm unit 20220
Alarm unit 20221
1 2
Alarm
Probe
Ader Nr. 1 2
Ader Nr. 1 2 3
Alarm
Electronic
probe for con-
ductive liquids
Optical probe for
conductive and
non-conductive
liquids
Alarm
4.3 Operation