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 Measurement Range
RS Stock No. 354-290
Mfr. Part No.PS31SUS3041000MM
BrandOmron
€27.64
1 Kit
Kit(s)
Electrode Chassis Mount - Phenol Resin, Stainless Steel - - - +70°C - - - - - -
RS Stock No. 794-3415
Mfr. Part No.211000A1NA
BrandRosemount
€153.58
Each
units
Fork Level Switch Side or Top Mount Direct Load Stainless Steel - - -40°C +150°C - - 500 mA 100bar - -
RS Stock No. 377-9888
Mfr. Part No.VN3
€71.45
Each
units
Conductive Cable - Nylon 6 2m - 0°C +90°C - - - 10bar - -
RS Stock No. 794-3434
Mfr. Part No.211010A1NA
BrandRosemount
€155.09
Each
units
Fork Level Switch Side or Top Mount PNP Stainless Steel - - -40°C +150°C - - 500 mA 100bar - -
RS Stock No. 493-7186
Mfr. Part No.7ML5221-1BB11
BrandSiemens
€1,393.60
Each
units
Ultrasonic - - PBT - - -40°C +85°C - - 20 mA - - -
RS Stock No. 493-6846
Mfr. Part No.FX-S.61C 2M
BrandVega
€194.51
Each
units
Radar - - PBT - - - - - - 20 mA 4bar - -
RS Stock No. 768-2028
Mfr. Part No.VIBS61.EXX2RA
BrandVega
€514.95
Each
units
Sensor Cable Relay - - - -40°C +150°C - - 1 A dc, 3 A ac 1.1bar - -
RS Stock No. 889-1273
Mfr. Part No.LV41-7501
BrandFlowline
€100.26
Each
units
Sump Float Level Switch Vertical - Polypropylene 15.2m - 0°C +50°C 250V - 10 A 14.5psi - -
RS Stock No. 768-2000
Mfr. Part No.WAVES61.EEJ2RA
BrandVega
€498.69
Each
units
Vibrating Level Switch Cable Relay - - - -40°C +150°C - - 1 A dc, 3 A ac 1.1bar - -
RS Stock No. 511-5157
Mfr. Part No.VLSKB131Z
€480.13
Each
units
Solids Level Switch Horizontal, Vertical Relay Aluminium Alloy - - -20°C +110°C - - 8 A 10bar - -
RS Stock No. 354-335
Mfr. Part No.F0301SUS201ELECTRODE
BrandOmron
€17.99
Each
units
Electrode Chassis Mount - Stainless Steel - - - +70°C - - - - - -
RS Stock No. 124-0137
Mfr. Part No.LU10-1305
BrandFlowline
€308.33
Each
units
Ultrasonic Level Switch Vertical - PP 3m - -40°C +80°C - 36V - 10bar FKM -
RS Stock No. 387-0379
Mfr. Part No.KON66.XG3VPR
BrandVega
€457.58
Each
units
Conductive Vertical Relay Plastic - - -40°C +100°C - - 1 A dc, 3 A ac 6bar - -
RS Stock No. 889-1393
Mfr. Part No.DX10-00-8FT
BrandFlowline
€340.21
Each
units
Ultrasonic Level Sensor Vertical - Polycarbonate 1.2m - -35°C +60°C - 24V 15 (Nominal) mA 30psi Viton -
RS Stock No. 185-9869
Mfr. Part No.S01DB/F68/4
€539.99
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. 740-6442
Mfr. Part No.LMT100
€156.24
Each
units
Electronic Flush Mount PNP NO/NC FPM, PA12, PEEK, Stainless Steel - - 0°C +60°C - - 50 mA 16bar PEEK -
RS Stock No. 869-7665
Mfr. Part No.ILLS-G0250-D-005
BrandCynergy3
€293.90
Each
units
Pressure Cable 0.5-4.5V Stainless Steel 5m - -20°C +60°C - 32V - 20bar - -
RS Stock No. 889-1346
Mfr. Part No.DL10-11
BrandFlowline
€347.94
Each
units
Ultrasonic Level Transmitter Vertical - Polycarbonate 1.2m - -35°C +60°C - 24V 20 mA 30psi Viton -
RS Stock No. 185-9881
Mfr. Part No.S01DB/F21/1
€588.06
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. 386-957
Mfr. Part No.WAVES61.EXX2RA
BrandVega
€400.88
Each
units
Tuning Fork Horizontal Relay Aluminium/PBT - - -40°C +80°C - - 1 A dc, 3 A ac 25bar - -