The WGA 04 alarm unit monitors petrol, grease and oil separators to check for the accumulation of sludge or sand and sends out an alarm signal when the separator needs to be cleaned. The WGA 05 also monitors how thick the layer of separated liquid is and sends an alarm signal when the separator needs to be drained.
The WGA 04 features an ultrasonic probe and a control unit. When solid matter is detected between the two probe tips, the ultrasonic probe generates an alarm signal. The control unit features visual and audible alarms, two relay outputs, and acknowledge and test buttons.
The WGA 05 also has a conductivity probe that monitors the layer of petrol, oil or grease. The constant level of the separator has the WGA-SD 02 probe mounted below it.