Cảm biến báo mức siêu âm Mobrey Squitch 2
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 can use a 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. It 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 threaded options available, and installation can be in any position on the vessel. Operation When a liquid fills 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 no 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.