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 sensor’s 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 Communication Protocol Minimum Operating Temperature Maximum Operating Temperature Maximum AC Voltage Maximum DC Voltage Maximum Current Maximum Pressure Gasket Material Current Rating
RS Stock No. 183-7322
Mfr. Part No.GRF18S-P234LV
BrandSick
TWD3,800.00
Each
units
Optical Point Level Switch G1/2 Thread NC, PNP Stainless Steel - - -25°C +55°C - 30V - 16bar - ≤30 mA
RS Stock No. 175-5058
Mfr. Part No.LFV200-XXHCLIPM
BrandSick
TWD19,600.00
Each
units
Vibrating Level Switch 1.5” Triclamp Thread PNP PEI, Stainless Steel 1.4404 - IO-LINK -40°C +70°C - 30V 250 mA 64bar - -
RS Stock No. 907-3937
Mfr. Part No.79999
TWD5,286.00
Each
units
Level Switch Vertical SPST NO Stainless Steel 600mm - -40°C +249°C - - - 750psi - -
RS Stock No. 193-6740
Mfr. Part No.LLC200D3SH
TWD1,124.00
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. 193-6783
Mfr. Part No.LLG610D3L24-004-D
TWD7,420.00
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. 124-0130
Mfr. Part No.LU77-5004
BrandFlowline
TWD25,900.00
Each
units
Ultrasonic Level Switch Vertical - PC - - -40°C +71°C 250V - 20 mA 2bar FKM 2 A
RS Stock No. 613-3386
Mfr. Part No.SG51.XXTGATPVL
BrandVega
TWD10,311.00
Each
units
Tuning Fork Horizontal PNP Stainless Steel - - -40°C +150°C - - 20 mA 64bar - -
RS Stock No. 889-1400
Mfr. Part No.FT10-1305
BrandFlowline
TWD7,757.00
Each
units
Liquid and Gas Flow Switch Cable - Polypropylene 3m - -40°C +60°C - 36V - 150psi Viton 1 A
RS Stock No. 780-0309
Mfr. Part No.OLS200D3SH
BrandCynergy3
TWD1,428.00
Each
units
Optical Sensor Chassis Mount Transistor Polysulfone 250mm - -25°C +80°C - - 100 mA 7bar - -
RS Stock No. 193-6739
Mfr. Part No.LLC105100
TWD1,866.00
Each
units
Liquid Level Switch Threaded Mount Transistor Polysulfone - - -40°C +125°C - 15.4V 2.5 mA 7bar - 2.5 mA
RS Stock No. 780-0305
Mfr. Part No.OLS500D3L
BrandCynergy3
TWD1,324.00
Each
units
Optical Sensor Chassis Mount Transistor Polysulfone 250mm - -25°C +80°C - - 100 mA 20bar - -
RS Stock No. 780-0302
Mfr. Part No.OLS500D3
BrandCynergy3
TWD1,343.00
Each
units
Optical Sensor Chassis Mount Transistor Polysulfone 250mm - -25°C +80°C - - 100 mA 20bar - -