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
RS Stock No. 794-3428
Mfr. Part No.2120D1AK1I1AAA0000
BrandRosemount
£395.89
Each
Units
Fork Level Switch Side or Top Mount NAMUR Glass Filled Nylon - -40°C +150°C - - 2.5 mA 100bar Non Asbestos Sheet - ATEX
RS Stock No. 407-2368
Mfr. Part No.LA9RM201
£49.00
Each
Units
Electrode Cable Suspension - - - - +100°C - - - - - - -
RS Stock No. 208-7453
Mfr. Part No.B59010-D1135-B40
BrandEPCOS
£13.74
Each
Units
Thermistor - - Stainless Steel - -25°C +55°C - - 45 mA 10bar - - -
RS Stock No. 204-6733
Mfr. Part No.003H2
BrandMobrey
£232.70
Each
Units
Gap Sensor Level Alarm Switch Horizontal, Vertical FET Polyphenylene Sulfide 3m -40°C +105°C - - 100 mA 5bar - - -
RS Stock No. 493-6830
Mfr. Part No.FX-S.61A 10M
BrandVega
£189.41
Each
Units
Radar - - PBT - - - - - 20 mA 4bar - - -
RS Stock No. 804-4083
Mfr. Part No.7MF1570-1CA01
BrandSiemens
£562.00
Each
Units
Transmitter Cable - Stainless Steel 10m -10°C +80°C - - 20 mA - - - -
RS Stock No. 768-2028
Mfr. Part No.VIBS61.EXX2RA
BrandVega
£380.88
Each
Units
Sensor Cable Relay - - -40°C +150°C - - 1 A dc, 3 A ac 1.1bar - - -
RS Stock No. 539-5735
Mfr. Part No.CP64.XXFGARKMX L=300
BrandVega
£883.89
Each
Units
Capacitance Horizontal, Vertical Relay PTFE - -50°C +200°C - - 1 A dc, 3 A ac 64bar - - -
RS Stock No. 794-3389
Mfr. Part No.LFP0500-A4NMB
BrandSick
£340.34
Each
Units
Guided Radar Vertical 0-10V, 2 PNP, 4-20mA, NPN PBT - -20°C +100°C - - 100 mA 10bar PTFE - -
RS Stock No. 768-1956
Mfr. Part No.SONS61.EXXX
BrandVega
£552.60
Each
Units
Vibrating Rod - Relay - - - - - - 20 mA - - - -
RS Stock No. 889-1346
Mfr. Part No.DL10-11
BrandFlowline
£288.42
Each
Units
Ultrasonic Level Transmitter Vertical - Polycarbonate 1.2m -35°C +60°C - 24V 20 mA 30psi Viton - -
RS Stock No. 794-3415
Mfr. Part No.211000A1NA
BrandRosemount
£126.68
Each
Units
Fork Level Switch Side or Top Mount Direct Load Stainless Steel - -40°C +150°C - - 500 mA 100bar - - -
RS Stock No. 804-4159
Mfr. Part No.7ML1106-1BA200A
BrandSiemens
£446.06
Each
Units
Ultrasonic - - - - -20°C +65°C - - - - - - -
RS Stock No. 493-7192
Mfr. Part No.7ML5221-1DB11
BrandSiemens
£918.00
Each
Units
Ultrasonic - - PBT - -40°C +85°C - - 20 mA - - - -
RS Stock No. 804-4112
Mfr. Part No.7ML1201-1FE00
BrandSiemens
£968.00
Each
Units
Ultrasonic Vertical Relay - - -40°C +60°C - - - - - - -
RS Stock No. 768-2000
Mfr. Part No.WAVES61.EEJ2RA
BrandVega
£368.85
Each
Units
Vibrating Level Switch Cable Relay - - -40°C +150°C - - 1 A dc, 3 A ac 1.1bar - - ATEX
RS Stock No. 746-7523
Mfr. Part No.1SVR450056R0200
BrandABB
£13.22
Each
Units
Electrode Vertical - High Grade Steel, Stainless Steel - - - - - - - - - -
RS Stock No. 285-778
Mfr. Part No.FFAK 16 PTD 1099/L
BrandBaumer
£129.94
Each
Units
Liquid Level Sensor Vertical/Horizontal PNP Polysulphone - 0°C +65°C - - 200 mA 10bar - - -
RS Stock No. 794-3430
Mfr. Part No.2120D1AT1E1XA0000
BrandRosemount
£422.28
Each
Units
Fork Level Switch Side or Top Mount Direct Load Aluminium - -40°C +150°C - - 500 mA 100bar Non Asbestos Sheet - ATEX
RS Stock No. 889-1393
Mfr. Part No.DX10-00-8FT
BrandFlowline
£282.01
Each
Units
Ultrasonic Level Sensor Vertical - Polycarbonate 1.2m -35°C +60°C - 24V 15 (Nominal) mA 30psi Viton - -
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