Model OSA -Layer Level Alarm / Overflow Alarm

OSA consists of an alarm unit, an ES4 capacitance sensor for detecting the layer level and an optional WGA-R6 PTC thermistor sensor for detecting the maximum permissable level or ES8 silt sensor. The alarm unit has 2 relay outputs, audio/visual alarms and also test and re-set buttons. The alarm unit monitors the sensors for short circuits or cable breaks in the sensor circuits.

The ES4 probe is mounted at least 150mm below the normal level of the separator. When the oil or petrol layer reaches the critical level, the unit generates an alarm signal. By installing the WGA-R6 probe above the normal level, the maximum level in the separator can also be detected. If the ES8 sensor is fitted then silt levels in the separator can be monitored.