Pepperl+Fuchs LAL-SRW Manuel page 24

WARNING DEVICE
Operation
Sludge level sensor
Test mode with connection of supply voltage
EN
If the supply voltage is connected, the sensor is run for the first 10 minutes automatically in test
mode.
After the sensor has been in test mode for 10 minutes, it is run automatically in normal mode
and the regular monitoring periods are observed.
Test mode with check and positioning of the sensor.
Run the sensor in test mode.
1.
2.
Note!
Note that after a power supply failure, alarms can be occurred at short intervals within the first
10 minutes.
Sensor in normal mode
•
•
22 - EN
Interrupt the supply voltage to the warning device.
The sensor switches to test mode.
Lower the sensor into the sludge.
The sensor switches in the alarm state.
The red "SLUDGE ALARM" LED lights and, if applicable, an acoustic signal sounds.
Normal state:
In normal operation, the sensor must be immersed for at least 10 minutes in water without
a break.
The green "SYSTEM OK" LED lights up or flashes at the warning device.
Alarm state
In alarm state, the sensor must either be covered by sludge without a break for at least
10 minutes or be suspended freely in midair.