The Mobrey Squitch 2 is a compact,self-contained ultrasonic sensor with a 240 Vac/Vdc switching capability.This switching electronics requires only two electrical connections and using simple instrument cable. When connected in series with the load(contactor,starter,relay,etc.),the Squitch 2 acts as a simple switch that is operated by a liquid presence.lt may also be interfaced directly to a Programmable Logic Controller(PLC).For this purpose,a dedicated PLC terminal is provided within the housing. The Squitch 2 sensor is for use in non-hazardous areas only.There are a variety of mounting options including threads and hygienic couplings,and installation can be in any position in the vessel. OPERATION When a liquid fils the sensor gap,an ultrasonic signal is transmitted across the gap and the presence of liquid is signalled.When the sensor gap is filled with air,there is in signal transmitted and a "dry"state is signalled. Easy On-site Set-up A selector switch sets the Squitch 2 to energise in either wet or dry conditions. When the Squitch 2 is "off",less than 4.5 mA is drawn through the load and a red LED(viewed through a cover lens)flashes approximately once per second. When the Squitch 2 is"on",the full load current of 0.5 A(maximum)flows and the red LED is lit constantly. In this way,there is always an indication that the ultrasonic gap sensor is"alive and well". A typical Application is point level detection in a wide variety of industries including vegetable oil refineries,confectionery,breweries,food machinery,and pharmaceutical plant.