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Optical Liquid Level Sensor for controlling the oil level of compressors
The optical liquid level switch uses the principle of total reflection in a prism. Reflection or penetration, is the basis of the level alarm output. When the sensor is surrounded by air, the angle of incidence is greater than the critical angle and thus total reflection occurs.
Totally reflected light will be transmitted to the receiver. Conversely, when the sensor is surrounded by liquid, due to the refractive index of the liquid and the sensor tip material, almost all light will penetrate the front of the sensor.
Using this principle, the optical liquid level switch design is based on light. The receiver can detect and determine a light reflected or penetrated state, and determines the circuit output.
- Simple, compact, and robust.
- No moving parts.
- M12 or 3/8"G (PF) of connection
- NPN, PNP Open collector output to energize relay or PLC
- Over-current and reverse polarity protected
- LED status indication
- IP68,PC, Polysulfone or SUS304
- Pressure range 10 kg/cm2 for PC, Polysulfone, 40 kg/cm2 for SUS304
- Built-in, solid-state electronics
- Easily removed, cleaned, and reinstalled
- Low level liquid detect ( 3 mm )
- Pharmaceutical systems
- Air conditioning systems
- Industrial compressors
- Food and beverage systems
- Hydraulic reservoirs
- Machine tools
- Liquid holding tanks
- Processing and packaging equipment
- Heavy duty automotive
- Sumps
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