Optomax Digital Series Liquid Level Switches

SST’s LLx liquid level switches can sense almost any liquid for low power and low-cost solutions

SST's Optomax digital liquid level switches are ideal for applications with restricted space that require a miniature, low power, and low-cost sensing solution. The microcontroller-based sensor is solid state, incorporating an infrared LED and phototransistor which are optically coupled by the tip when the sensor is in air. When the sensing tip is immersed in liquid, the infrared light from the Optomax digital sensor escapes making the output change state. The sensor can detect the presence or absence of almost any liquid type, oil or water based. It is insensitive to ambient light and is not affected by foam when in air or by small bubbles when in liquid.

The TTL compatible push-pull output can sink and source up to 100 mA at a supply voltage range of 4.5 V_DC to 15.4 V_DC and can be configured to output a high or low signal when in either a wet or dry state. A fail-safe PWM option is also available with a supply voltage range of 4.5 V_DC to 5.5 V_DC.

With housing options for internal or external sensor mounting and use in two operating temperature ranges, standard (-25°C to +80°C) or extended (-40°C to +125°C). The Optomax is available in two chemically resistant housing materials, polysulfone, the standard choice for most applications or Trogamid®, which is typically used in food and beverage applications.