Liquid Level Sensors

PST design, test and manufacture over 300,000 sensors a year.

We have the widest range of optical liquid level detection sensors available for any oil/ water-based liquid, reliably detecting the absence or presence of liquids in an application where status is critical.

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FAQ's

1) How accurate are PST liquid level sensors?

Optical level switches provide precise monitoring of liquid levels, offering repeatable long life switching and control. The ability to detect from 1mm of liquid touching or leaving the sensor to trigger the switching output provides fast accurate control.
2) How versatile are optical level switches?

Optical sensors are versatile and can be used with a wide range of liquids, including clean and clear liquids, as well as those with suspended particles or bubbles. They are suitable for applications across various industries, from pharmaceuticals to food and beverage production.
3) Can optical level switches be used in Explosive Atmospheres?

Yes we offer a range of Intrinsically Safe level sensors for use with potentially hazardous liquids.
4) How quick is the Optical Sensor Response Time?

Optical sensors offer sub second response times, providing real-time data on liquid levels for quick decision-making and process control. This fast response is particularly beneficial in dynamic environments where liquid levels fluctuate frequently. Optional firmware variants allow for sloshing liquids and prevent false indications.
5) What advantage do optical sensors offer in terms of maintenance compared to other sensor types?

Optical sensors typically require minimal maintenance compared to other sensor types. With no moving parts to wear out or mechanical components to adjust, optical sensors offer reliable long-term operation with little to no maintenance required.
6) Are the sensors easy to install?

Optical level switches are often easy to install and integrate into existing systems. They can be mounted internally or externally to the tank or vessel, eliminating the need for complex installation procedures or modifications to the container.
7) What is the fluid compatibility range of optical level sensors?

Optical level sensors come in a wide range of housings to make them compatible to most acidic or alkaline liquids as well as hydrocarbon or plant based oils. With versions suitable for drinking water and pharmacopeia approvals our level switches are used in many industries.
8) Do these sensors offer Remote Monitoring Capabilities?

Optical sensors can be easily integrated with remote monitoring and control systems, allowing for remote access to liquid level data. This capability enables operators to monitor liquid levels from a distance, enhancing efficiency and safety.
9) How do these sensors work?

When in the air, the infrared light inside the sensor tip is reflected back to the detector. When in liquid, the infrared light is refracted out of the sensor tip, causing less energy to reach the detector.
10) What is an optical level sensor?

In many applications, people need to recognise the presence or absence of liquids. The level switches from SST utilise the optical properties of liquids to determine whether a liquid is present or not. A wide range of process connections, materials, housing shapes, outputs and electrical connections are available to fulfil your requirements.