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Optical Level Switch

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Optical level switches operate using either visible, infrared or laser light, depending on what type of light is best-suited for the intended application. Read More…

Optical Level Switch Optical level switches are measurement control devices that operate using optical sensors in order to use the light transmittance, reflective or refractive properties of the material being measured to determine its level.
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Leading Manufacturers

Monterey, CA  |  831-373-0200

Sierra`s Innova-Switch™ electronic instruments and devices represent the state-of-the-art in gaseous and liquid flow switching or liquid level control.

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Sierra Instruments $$$

Minnetonka, MN  |  800-328-6170

Electro-Sensors manufactures a complete line of motion monitoring and speed control systems for industrial machinery including: Speed Sensors, Speed Sensitive Switches, Tachometers, Counters, Speed to Analog Converters, Digital Pulse Generators, Closed Loop Motor Speed Control Systems, and Material Level Controls. We have over 35 years experience manufacturing reliable products.

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Electro-Sensors, Inc. $$$

Fultonville, NY  |  800-833-0081

Anderson-Negele is a leading designer and manufacturer of high-quality pressure gauges, pressure switches, level switches and other transmitter instruments for the sanitary process of a variety of industries such as beverage, dairy, fluid food, biopharmaceutical. Our instrumentation will meet or exceed all requirements for performance, reliability, cleanability, and sterilization.

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Anderson-Negele $$$

Plainville, CT  |  855-877-9666

Over 50 years of sensors and controls development experience is only one of the many advantages to choosing Gems Sensors & Controls. We offer high quality switch and sensor solutions including standard level switches to suit your needs. Gems' expert team, cost-efficiency and commitment to lean manufacturing are further benefits to our valued customers. Call us today!

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Gems Sensors & Controls $$$
placeholder image Sierra Instruments Electro-Sensors, Inc. Anderson-Negele Gems Sensors & Controls

Able to measure the levels of clear, translucent, reflective and opaque materials, optical level switches can have either a contacting or non-contacting design. As a result of the wide-ranging capabilities of the optical level switch, the applications and industries in which it is utilized are numerous and include chemical processing, for material level control in aggressive and harsh environments; industrial manufacturing, for measurement purposes in many high temperature and high power processing applications; medical, for level sensing of materials requiring extremely precise measurements; and commercial, for diverse applications such as restaurants, fishing and satellite communications.

Some examples of materials that optical level switches are commonly used to measure and control include sediments, liquids with suspending solids and aqueous, organic and corrosive liquids such as water or food items.

Optical level switches operate without moving parts, instead depending on light emitting diodes (LEDs). LEDs used in optical level switches produce infrared light that used in the measurement of the material. Optical level switches mainly consist of an optical sensor, an LED, a probe and a photocell. In general, optical level switches react to their physical state and will change depending on whether they are wet or dry (at least, if the probe is wet or dry).

When wet, the amount of light that is reflected back to the level switch is reduced significantly as it is being reflected into the liquid material. As a result, if it is dry the amount of reflected light is increased significantly, thus signally a change in the level of the material. The additional reflected light is then detected by the photocell (which itself does not come into contact with the materials it measures) and then alerts the reaction of the level switch.

Able to operate at temperatures up to 125°C (257ºF) and at pressures of up to 500 PSI, optical level switches are incredibly accurate, cost-efficient and provide a rapid response time. Additional parts can be utilized such as fiber optic cable and a conductivity-type level sensor in order to widen the capabilities of the optical level switch.