Finetek improves the SD Optical Level Switch

Finetek improves the SD Optical Level Switch

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.

Features Simple, compact, and robust No moving parts Built-in, solid-state electronics Easily removed, cleaned, and reinstalled NPN, PNP open collector output to energize relay or PLC Outer material of PC, Polysulfone, SUS304/316 for acidity and alkaline; applicable in grease, waste water, liquid solution, liquor, alcohol....etc Over-current and reverse polarity protection LED status indication Application: liquid leakage detection, motor/pump protection

Application

• 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