Product Description
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. Tota ly 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.
The SD Series optical level switch uses the principle of light reflection in a prism to sense the absence or presence of a liquid at the point where the sensor is installed in a tank, pipeline or other type of container.
Description
Features。Simple and compact with no moving parts
。LED indication
。10-28VDC, 115VAC or 230VAC powered versions
。Solidstate NPN/PNP or relay output
。Operating temperatures up to 257⁰F (125⁰C)
。Wide range of use in machine systems for a variety of liquid level detection
。Unique SD22 design, switch body and tip disconnects