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. 889-1403
Mfr. Part No.FT10-5405-50
BrandFlowline
kr 4 721,19
Each
Units
Liquid and Gas Flow Switch Cable - Polypropylene 3m - -40°C +60°C - 36V - 150psi Viton 1 A
RS Stock No. 892-9372
Mfr. Part No.3301HA2S1V5AM01000SANAW2
kr 14 649,44
Each
Units
Guided Wave Radar Top Mount - Polyurethane-covered Aluminium 10m - -15°C +150°C - 42V - 40bar - -
RS Stock No. 892-9366
Mfr. Part No.2160XD8SS1NNBA00001NAWA3WK1M5
kr 13 060,11
Each
Units
Fork Level Detector Side or Top Mount Relay Aluminium - - -40°C +150°C - - - 100bar Non Asbestos Carbon Fibre -
RS Stock No. 498-7349
Mfr. Part No.VB61.XXAGDRKMX
BrandVega
kr 7 958,02
Each
Units
Vibrating Rod Free Relay Plastic - - -50°C +150°C - - 1 A dc, 3 A ac 16bar - -
RS Stock No. 889-1330
Mfr. Part No.DL10-00
BrandFlowline
kr 3 452,51
Each
Units
Ultrasonic Level Transmitter Vertical - Polycarbonate 1.2m - -35°C +60°C - 24V 20 mA 30psi Viton -
RS Stock No. 889-1393
Mfr. Part No.DX10-00-8FT
BrandFlowline
kr 3 090,32
Each
Units
Ultrasonic Level Sensor Vertical - Polycarbonate 1.2m - -35°C +60°C - 24V 15 (Nominal) mA 30psi Viton -
RS Stock No. 892-9369
Mfr. Part No.2130MA2MS1NNBA00001I1
kr 5 749,08
Each
Units
Fork Level Switch Side or Top Mount - Aluminium - - -40°C +180°C - - 500 mA 100bar - -
RS Stock No. 889-1362
Mfr. Part No.DL34-00
BrandFlowline
kr 6 225,92
Each
Units
Ultrasonic Level Sensor Vertical 2 Wire Relay Polycarbonate 1.2m - -35°C +60°C - 24V 20 mA 30psi Viton -
RS Stock No. 124-0133
Mfr. Part No.LR15-0010-20
BrandFlowline
kr 33 593,52
Each
Units
Pulse Radar Level Transmitter Flange Mount - Aluminium - - -60°C +150°C - 26V 20 mA 10.3bar Silicone 22.5 mA
RS Stock No. 768-2066
Mfr. Part No.MET381.XX
BrandVega
kr 5 415,87
Each
Units
Sensor Rail Mounting, Wall Mount Relay Plastic - - -20°C +60°C - - 20 mA - - -
RS Stock No. 419-4654
Mfr. Part No.SWING61XXGBVXPRX
BrandVega
kr 5 111,92
Each
Units
Vibrating Rod Horizontal, Vertical Relay Plastic - - -50°C +150°C - - 1 A dc, 3 A ac 64bar - -
RS Stock No. 377-9800
Mfr. Part No.VC5510NNOPT
kr 531,17
Each
Units
Capacitance - NPN ABS, Polycarbonate 1.5m - 0°C +50°C - 30V 100 mA - - -
RS Stock No. 804-3856
Mfr. Part No.7ML5501-0JA70
BrandSiemens
kr 3 626,13
Each
Units
Capacitance Switch Vertical Relay Stainless Steel - - -30°C +100°C - - - 10bar - -
RS Stock No. 889-1374
Mfr. Part No.DS14-00
BrandFlowline
kr 3 735,43
Each
Units
Controller, Ultrasonic Level Switch Vertical - Polycarbonate 1.2m - -35°C +60°C 24V 24V - 30psi Viton 1 A
RS Stock No. 804-4124
Mfr. Part No.7ML1100-0BA20
BrandSiemens
kr 10 854,54
Each
Units
Vibrating Rod - - - - - -40 °C, -20°C +60 °C, +73°C - - - - - -
RS Stock No. 407-2368
Mfr. Part No.LA9RM201
kr 635,04
Each
Units
Electrode Cable Suspension - - - - - +100°C - - - - - -
RS Stock No. 124-0119
Mfr. Part No.LG11-2003-01
BrandFlowline
kr 11 115,94
Each
Units
Guided Radar Level Sensor Vertical - Aluminium 5.5m - -40°C +85°C - 30V 20 mA 17bar - <50 mA
RS Stock No. 185-9881
Mfr. Part No.S01DB/F21/1
kr 5 759,05
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. 869-7725
Mfr. Part No.ILTS-G1000-015
BrandCynergy3
kr 4 727,73
Each
Units
Pressure Cable - Stainless Steel 15m - -20°C +60°C - 32V 28 mA 50bar - -
RS Stock No. 780-0305
Mfr. Part No.OLS500D3L
BrandCynergy3
kr 384,34
Each
Units
Optical Sensor Chassis Mount Transistor Polysulfone 250mm - -25°C +80°C - - 100 mA 20bar - -