Level Sensors

Level sensors determine how full or how empty a container is. Level sensors provide an output electrical signal at predetermined levels to communicate when to open or close control valves.

Level Sensor Types

The choice of sensors is usually determined by which substance is being measured, the environment in which the sensor is to used and in which position the sensor needs to be mounted. Some of the most common level sensors are:

Capacitive level switches

  • Capacitive level switches provide a basic full/empty level indication determined by the mounting position of the sensor. This type of switch is non-contact and uses a sensing field to determine liquid levels. Capacitive sensors provide accurate switching even with heavy residue build-up.

Vibrating level probes

  • Vibrating level probes use a rod or a fork that constantly produce high-frequency vibrations. When the vibrating probe comes into contact with the medium, the vibration changes and the vibrating level switch outputs a switching command. Vibrating level switches are used as overfill protection devices or low-level indicators in liquids as well as in granular and powder bulk solids.

Conductive level switches

  • Conductive level switches are sensors that use stainless steel probes with an electrical contact output to measure a specific liquid level. Used in conjunction with a level control relay to set and monitor each probe. Applications include ponds, reservoirs, sumps, pharmaceuticals, closed vessels and open tanks.

Ultrasonic level sensors

  • Ultrasonic level sensors generate ultrasonic sound pulses that are reflected by the surface of a liquid medium. The time travelled by the ultrasonic pulse is calculated by the sensor which then determines the distance of the liquid to give an accurate fill level. The ultrasonic sensors response is influenced by turbulence, pressure, moisture, and temperature.

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Description Price Device Type Mounting Type Switch Output Body Material Cable Length Minimum Operating Temperature Maximum Operating Temperature Maximum AC Voltage Maximum DC Voltage Maximum Current Maximum Pressure Gasket Material Current Rating Hazardous Area Certification
New
RS Stock No. 193-6733
Mfr. Part No.LLC103000
£35.00
Each
Units
Liquid Level Switch Threaded Mount Transistor Polysulfone - -25°C +80°C - 15.4V 2.5 mA 7bar - 2.5 mA -
RS Stock No. 187-1812
Mfr. Part No.LBFS-01421.0
BrandBaumer
£145.88
Each
Units
Level Switch Bottom Mount, Side Mount, Top Mount PNP Stainless Steel 5m -40°C +85°C - 30V 20 mA 100bar - 20 mA -
New
RS Stock No. 193-6756
Mfr. Part No.LLC610D3L24-004
£39.90
Each
Units
Liquid Level Switch Threaded Mount PNP Polysulfone - -40°C +125°C - 30V 7.5 mA 7bar - 7.5 mA -
RS Stock No. 869-7671
Mfr. Part No.ILLS-G1000-D-015
BrandCynergy3
£203.50
Each
Units
Pressure Cable 0.5-4.5V Stainless Steel 15m -20°C +60°C - 32V - 50bar - - -
New
RS Stock No. 193-6790
Mfr. Part No.LLG210D3L24-003-D
£176.00
Each
Units
Liquid Level Switch Threaded Mount NPN Stainless Steel 316L - -40°C +125°C - 30V 7.5 mA 100bar - 7.5 mA -
RS Stock No. 175-5059
Mfr. Part No.LFV200-XXSGAIPM
BrandSick
£205.68
Each
Units
Vibrating Level Switch G1  Thread PNP PEI, Stainless Steel 1.4404 - -40°C +70°C - 30V 250 mA 64bar - - -
RS Stock No. 177-9130
Mfr. Part No.9038CG36LZ20
£241.00
Each
Units
Mechanical Alternator Screw In - Painted Cold-Rolled Steel - -22°F +220°F 230 (Single Phase) V, 475 (3 Phase) V 230V - - - - -
New
RS Stock No. 193-6765
Mfr. Part No.LLG610D324-004
£95.00
Each
Units
Liquid Level Switch Threaded Mount PNP Stainless Steel 316L - -40°C +125°C - 30V 7.5 mA 100bar - 7.5 mA -
RS Stock No. 889-1182
Mfr. Part No.LU23-40
BrandFlowline
£596.23
Each
Units
Ultrasonic Level Transmitter Vertical - Polycarbonate 4.6m -35°C +60°C - 24V 20 mA 30psi Viton - -
New
RS Stock No. 193-6732
Mfr. Part No.LLC102000
£35.00
Each
Units
Liquid Level Switch Threaded Mount Transistor Polysulfone - -25°C +80°C - 15.4V 2.5 mA 7bar - 2.5 mA -
RS Stock No. 177-9129
Mfr. Part No.9038AG1
£122.00
Each
Units
Mechanical Alternator Pedestal Mount - Painted Cold-Rolled Steel - -22°F +220°F 230 (Single Phase) V, 475 (3 Phase) V 230V - - - - -
New
RS Stock No. 193-6731
Mfr. Part No.LLC101000
£35.00
Each
Units
Liquid Level Switch Threaded Mount Transistor Polysulfone - -25°C +80°C - 15.4V 2.5 mA 7bar - 2.5 mA -
New
RS Stock No. 193-6763
Mfr. Part No.LLG210D3L24-004
£95.00
Each
Units
Liquid Level Switch Threaded Mount PNP Stainless Steel 316L - -40°C +125°C - 30V 7.5 mA 100bar - 7.5 mA -
New
RS Stock No. 193-6762
Mfr. Part No.LLG210D324-004
£95.00
Each
Units
Liquid Level Switch Threaded Mount PNP Stainless Steel 316L - -40°C +125°C - 30V 7.5 mA 100bar - 7.5 mA -
New
RS Stock No. 193-6761
Mfr. Part No.LLC710D3L24-004
£39.90
Each
Units
Liquid Level Switch Threaded Mount PNP Polysulfone - -40°C +125°C - 30V 7.5 mA 7bar - 7.5 mA -
New
RS Stock No. 193-6760
Mfr. Part No.LLC710D324-004
£39.90
Each
Units
Liquid Level Switch Threaded Mount PNP Polysulfone - -40°C +125°C - 30V 7.5 mA 7bar - 7.5 mA -
New
RS Stock No. 193-6759
Mfr. Part No.LLC710D3L24-003
£39.90
Each
Units
Liquid Level Switch Threaded Mount NPN Polysulfone - -40°C +125°C - 30V 7.5 mA 7bar - 7.5 mA -
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