Instructions

13
ALARM WITH HOLD MEMORY
I. Alarm when the sensor detects liquid :
Mount liquid sensor S1 and connect a NC pushbutton with the connection pins of sensor S2. As soon as
the sensor detects liquid, the relay receives power (LED LD4 starts burning) and remains powered, even
when the sensor returns to a dry state. The alarm device is activated through the NO relay. The alarm
cannot be switched of before the sensor has stopped detecting liquid. When this is the case, press the
pushbutton to switch the alarm off.
A next liquid detection will reactivate the alarm.
II. Alarm when the sensor does not detect liquid
Mount liquid sensor S2 and connect a NO pushbutton with the connection pins of sensor S1. Connect the
alarm device in series With the NC relay. If the alarm should be active after mounting, press the
pushbutton to switch it off. If the sensor does not detect liquid, even for the briefest of moments, the relay
will switch and the alarm will become active. The alarm cannot be switched off until the sensor detects
liquid again. Push the pushbutton briefly: the relay is powered and the alarm is switched off.
Applications