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. You can find out more in our comprehensive level sensors guide.


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. 354-290
Mfr. Part No.PS31SUS3041000MM
BrandOmron
£24.51
1 Kit
Kit(s)
Electrode Chassis Mount - Phenol Resin, Stainless Steel - - - +70°C - - - - - -
RS Stock No. 493-7186
Mfr. Part No.7ML5221-1BB11
BrandSiemens
£777.00
Each
Units
Ultrasonic - - PBT - - -40°C +85°C - - 20 mA - - -
RS Stock No. 493-6802
Mfr. Part No.SG51.XXSGBTPV
BrandVega
£177.61
Each
Units
Tuning Fork Horizontal PNP Stainless Steel - - -40°C +100°C - - 250 mA 64bar - -
RS Stock No. 498-7349
Mfr. Part No.VB61.XXAGDRKMX
BrandVega
£620.01
Each
Units
Vibrating Rod Free Relay Plastic - - -50°C +150°C - - 1 A dc, 3 A ac 16bar - -
RS Stock No. 613-3386
Mfr. Part No.SG51.XXTGATPVL
BrandVega
£232.50
Each
Units
Tuning Fork Horizontal PNP Stainless Steel - - -40°C +150°C - - 20 mA 64bar - -
RS Stock No. 354-335
Mfr. Part No.F0301SUS201ELECTRODE
BrandOmron
£15.95
Each
Units
Electrode Chassis Mount - Stainless Steel - - - +70°C - - - - - -
RS Stock No. 185-9881
Mfr. Part No.S01DB/F21/1
£452.35
Each
Units
Liquid Level Switch Top Mount SPST Aluminium Bronze - - - +210°C - - 2 A dc, 5 A ac 18bar Non Asbestos Sheet -
RS Stock No. 377-9888
Mfr. Part No.VN3
£53.35
Each
Units
Conductive Cable - Nylon 6 2m - 0°C +90°C - - - 10bar - -
RS Stock No. 185-9853
Mfr. Part No.S01DB/F68/1
£397.98
Each
Units
Liquid Level Switch Side Mount SPST Aluminium Bronze - - - +210°C - - 2 A dc, 5 A ac 18bar Non Asbestos Sheet -
RS Stock No. 493-6852
Mfr. Part No.PS61.XXAGPHKMXX
BrandVega
£1,569.39
Each
Units
Radar Vertical - Plastic - - -40°C +80°C - - 20 mA 2bar - -
RS Stock No. 204-6749
Mfr. Part No.003S2
£222.91
Each
Units
Gap Sensor Level Alarm Switch Horizontal, Vertical Relay Polyphenylene Sulfide 3m - -20°C +70°C - - 1 A 5bar - -
RS Stock No. 613-3522
Mfr. Part No.SG51.XXSGATPV
BrandVega
£190.53
Each
Units
Tuning Fork Horizontal PNP Stainless Steel - - -40°C +100°C - - 250 mA 64bar - -
RS Stock No. 386-957
Mfr. Part No.WAVES61.EXX2RA
BrandVega
£308.37
Each
Units
Tuning Fork Horizontal Relay Aluminium/PBT - - -40°C +80°C - - 1 A dc, 3 A ac 25bar - -
RS Stock No. 901-0289
Mfr. Part No.FX81.IXETBFHXKMXX
BrandVega
£1,210.96
Each
Units
TDR Sensor Cable HART Stainless Steel 75m - -40°C +80°C 253V 48V 20 mA 40bar EPDM Rubber, FFKM, FKM 4 → 20 mA
RS Stock No. 804-4130
Mfr. Part No.7ML1115-0CA30
BrandSiemens
£519.00
Each
Units
Ultrasonic - - - - - -20°C +95°C - - - - - -
RS Stock No. 613-3415
Mfr. Part No.SN61.CXAGHKMX
BrandVega
£1,147.44
Each
Units
Ultrasonic Vertical - Plastic - - -40°C +80°C - - 20 mA 2bar EPDM Rubber -
RS Stock No. 185-9869
Mfr. Part No.S01DB/F68/4
£415.38
Each
Units
Liquid Level Switch Side Mount SPST Aluminium Bronze - - - +210°C - - 2 A dc, 3 A ac 18bar Non Asbestos Sheet -
RS Stock No. 804-4140
Mfr. Part No.7ML1106-2BA200A
BrandSiemens
£446.06
Each
Units
Ultrasonic - - - 10m - -20°C +65°C - - - - - -
RS Stock No. 513-2427
Mfr. Part No.7ML5610-0BD20
BrandSiemens
£117.97
Each
Units
Capacitance - Relay Polyphenylene Sulfide - - -40°C +85°C - - 20 mA 10bar - -
RS Stock No. 794-3418
Mfr. Part No.211001A1NA
£130.48
Each
Units
Fork Level Switch Side or Top Mount Direct Load Stainless Steel - - -40°C +150°C - - 500 mA 100bar - -
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