Compact liquid level switches deliver low power operation

Each unit incorporates an Infra-Red (IR) LED emitter, a phototransistor and a microcontroller within a streamlined housing (which can be as small as 22.7x12mm) suited to space constrained settings.

As they rely on solid state electronics, rather than the conventional mechanical technology of float switches, SST Sensing claims that the members of the Optomax series are not prone to jamming or wear and tear - resulting in long, maintenance-free operational lifespans. Furthermore, the performance of these liquid level switches is not affected by ambient light. This is due to the advanced optical design employed, as well as SST Sensing’s propriety signal conditioning algorithms. Furthermore, they are not affected by the presence of a foam layer on top of the liquid, so accuracy levels are assured.

There are a multitude of application possibilities for the Optomax series. Among these are fuel/industrial chemical tanks, hydraulic systems in heavy machinery, vending machines, telecommunication cabinets and transportation. To broaden their scope still further, these devices are supplied in a choice of rugged, chemically-resistant materials that can deal with the harshest of fluid media. The standard Polysulfone housing is complemented by a Trogamid option (which is suited to use in the food/beverage sector and has full European standards approval). The switches can be externally or internally mounted, with an array of different fittings offered (M10, M12, 1/2" SAE, 1/4" NPT).

Driven by a 4.5-15.4VDC supply, these low power devices draw a maximum current of 2.5mA. The sensors are available with high or low in air outputs as well as a PWM option for maximum reliability and fail-safe operation. They are capable of supporting pressures of up to 20bar and offer an operational temperature range of -25 to 80°C (with extended range versions covering -40 to 125°C).