Optical Level Switch

The optical level switch has many uses, especially in a wide range of machines to determine high or low levels of various fluids.  The advantages of an optical level switch typically include their compact size, high reliability and relatively low cost.  However, using the optical level switch is for liquids only, typically clean liquids.  From a control standpoint most optical level switch units provide solidstate transistor type outputs, TTL, NPN and PNP.

The optical level switch uses the principle of light refraction in a prism to sense the absence and presence of a liquid at the point where the optical level switch is installed in a tank, pipeline or other type of container.

The optical level switch emits a beam of infrared light into the tip (prism) of the sensor.  In the absence of a fluid at the sensor tip the light is reflected back to the sensor’s receiver.  When the target fluid is present surrounding the tip (prism), the light is refracted into the fluid and away from the optical level switch receiver.  This is how the switch detects the presence and absence of a liquid.

Use of the optical level switch is typically found in the following areas:
– Industrial HVAC machinery
– Wide range of machine manufacturing
– Food & beverage machinery
– Automotive
– Industrial sump pumps
– General liquid storage

These switches are easy to use, install and low cost.  They are also very reliable and work in a wide range of liquids, temperatures, pressure and viscosity.  They can be provided with prewired cable or M12 connectors for the electrical connections.  A choice of wetted tip material and body material also exists.

For a further look at an optical level switch product line you can visit our SD series product page or download the SD series pressure switch sales catalog.

For more information on the SD series optical level switch product line you can contact us at 815-632-3132.

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