Water Level Sensors and Transmitters

Level sensors are used to detect the level of substances that can flow. Such substances include liquids, slurries, granular material and powders. Level measurements can be done inside containers or it can be the level of a river or lake. Such meaurements can be used to determine the amount of materials within a closed container or the flow of water in open channels.

RS Hydro have a wide range of pressure, ultrasonic, open channel, radar and capacitance level sensors and transmitters for sale and hire. For more information about the level sensors and transmitters we supply please select from one of the options below:


Ultrasonic level sensors are ideal for a wide range of applications including water, wastewater, bulk solids and high viscocity liquids. Ultrasonic controllers are ideal for pump and level control applications.

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Pressure level sensors

Our range of pressure level sensors provide a low-power, high accuracy solution for many level monitoring applications. The PT2X, PTX1830/1730 & PT12 level sensors represent the leading edge of level sensing technology.

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Radar level sensors

Radar level sensors can be used for more difficult applications including environments where there are significant vapours or dust such as steam. Radar is also ideal for long-range applications or where the dialetric properties of the fluid will not allow ultrasonic devices to work.

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Open channel level sensors

Open Channel

RS Hydro has a wide range of level sensors for measuring flows in open channel applications using ultrasonic, pressure and laser technologies. Many of our open channel flow measurement technologies are available for rental and purchase.

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Capacitance level sensors


Versatile flow meters for use with a wide range of solids, liquids and slurries.

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Pressure Level Sensors

Hydrostatic pressure level sensors are submersible sensors used for measuring the level of liquids (including corrosive liquids) in deep tanks or water in reservoirs. Pressure water level loggers provide accuracy and reliability across a wide range of applications.

Ultrasonic Water Level Transmitters

Non-contact ultrasonic level sensors emit ultrasonic (20 kHz to 200 kHz) acoustic waves from a transducer which also detects and measures the reflected waves. This type of sensor is ideal for measuring bulk solids such as sand, cement, grain, rice and plastic pellets as well as liquids with high viscosity such as slurries, heavy oil, grease and latex.

Capacitance Level Sensors

Often called RF due to the radio frequency signals that are applied to the capacitance circuits, these type of sensors are excellent for measuring a wide range of liquids, slurries and solids. Capacitance level sensors can be used to measure media with dielectric constants between 1.1 and 90. Capacitance level sensors are rugged, contain no moving parts, are easy to clean and simple to use.

Radar Level Sensors

Also known as microwave level sensors, radar level sensors are ideal for use in environments where temperature varies and in moist, dusty or vaporous environments. The microwaves are able to penetrate temperature and vapour layers that can be problematic for other types of water level sensor. Objects with high dielectric constants such as metal and conductive water will reflect microwaves. Conversley, media with low dielectric constants (glass, plastics, food stuffs, paper) will absorb the microwaves by varying degrees.

Radar water level sensors are ideal for use in a vacuum as the microwaves are electromagnetic energy and don't require air molecules to propogate.

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