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. 780-0175
Mfr. Part No.SSF22X100-18N
BrandCynergy3
kr 633,86
Each
Units
Level Switch Vertical - Stainless Steel 1m - -20°C +120°C - - 500 mA 10bar - -
RS Stock No. 794-3434
Mfr. Part No.211010A1NA
kr 1 651,34
Each
Units
Fork Level Switch Side or Top Mount PNP Stainless Steel - - -40°C +150°C - - 500 mA 100bar - -
RS Stock No. 869-7680
Mfr. Part No.ILSE-G0100-5
BrandCynergy3
kr 2 116,51
Each
Units
Pressure Chassis Mount 4-20mA Stainless Steel - - - - - 32V 28 mA 20bar - -
RS Stock No. 493-6802
Mfr. Part No.SG51.XXSGBTPV
BrandVega
kr 2 279,64
Each
Units
Tuning Fork Horizontal PNP Stainless Steel - - -40°C +100°C - - 250 mA 64bar - -
RS Stock No. 869-7652
Mfr. Part No.ILLS-G0250-5-005
BrandCynergy3
kr 2 843,29
Each
Units
Pressure Cable 4-20mA Stainless Steel 5m - -20°C +60°C - 32V 28 mA 20bar - -
RS Stock No. 493-7192
Mfr. Part No.7ML5221-1DB11
BrandSiemens
kr 12 741,66
Each
Units
Ultrasonic - - PBT - - -40°C +85°C - - 20 mA - - -
RS Stock No. 794-3395
Mfr. Part No.LFP0500-G1NMB
BrandSick
kr 8 210,25
Each
Units
Sensor Vertical 0-10 V, 4-20 mA Stainless Steel 500mm IO-LINK -20°C +150°C - - 100 mA 16bar PEEK -
RS Stock No. 780-0179
Mfr. Part No.SSF22X100-M12X1
BrandCynergy3
kr 633,86
Each
Units
Level Switch Vertical - Stainless Steel 1m - -20°C +120°C - - 500 mA 10bar - -
RS Stock No. 794-3383
Mfr. Part No.LFP1000-A4NMB
BrandSick
kr 3 963,08
Each
Units
Guided Radar Vertical 0-10 V, 4-20 mA PBT - IO-LINK -20°C +100°C - - 100 mA 10bar PTFE -
RS Stock No. 780-0321
Mfr. Part No.OLS210D324-003
BrandCynergy3
kr 1 016,87
Each
Units
Optical Sensor Chassis Mount Transistor Polysulfone 250mm - -40°C +125°C - - 1 A 7bar - -
RS Stock No. 513-2427
Mfr. Part No.7ML5610-0BD20
BrandSiemens
kr 2 352,92
Each
Units
Capacitance - Relay Polyphenylene Sulfide - - -40°C +85°C - - 20 mA 10bar - -
RS Stock No. 901-0289
Mfr. Part No.FX81.IXETBFHXKMXX
BrandVega
kr 12 994,31
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. 901-0299
Mfr. Part No.PS61.XXBXXHKMXX
BrandVega
kr 20 516,78
Each
Units
Radar Sensor Panel Mount HART Polypropylene - - -40°C +80°C 253V 48V 20 mA 3bar FPM 4 → 20 mA
RS Stock No. 768-2028
Mfr. Part No.VIBS61.EXX2RA
BrandVega
kr 5 084,29
Each
Units
Sensor Cable Relay - - - -40°C +150°C - - 1 A dc, 3 A ac 1.1bar - -
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. 857-7781
Mfr. Part No.VP02E
kr 1 289,99
Each
Units
Optical Sensor Cable NPN Polysulfone 2m - -20°C +80°C - - 200 mA 10bar - -
RS Stock No. 185-9853
Mfr. Part No.S01DB/F68/1
kr 5 071,33
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. 906-8121
Mfr. Part No.143570
kr 512,66
Each
Units
Level Switch Horizontal, Vertical NC Polysulfone 14in - -17.8°C +80°C - 28V 40 mA 150psi - 18 mA
RS Stock No. 794-3415
Mfr. Part No.211000A1NA
kr 1 651,34
Each
Units
Fork Level Switch Side or Top Mount Direct Load Stainless Steel - - -40°C +150°C - - 500 mA 100bar - -
RS Stock No. 768-2072
Mfr. Part No.TRENN149AEX.X
BrandVega
kr 2 569,78
Each
Units
Sensor DIN Rail - - - - - - - - 20 mA - - -