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. 794-3389
Mfr. Part No.LFP0500-A4NMB
BrandSick
£340.34
Each
Units
Guided Radar Vertical 0-10V, 2 PNP, 4-20mA, NPN PBT - IO-LINK -20°C +100°C - - 100 mA 10bar PTFE -
RS Stock No. 793-2812
Mfr. Part No.MHF15-21NG1PSM
BrandSick
£81.49
Each
Units
Optical Sensor Chassis Mount PNP Stainless Steel - - -25°C +55°C - - 100 mA 16bar - -
RS Stock No. 793-2825
Mfr. Part No.MHF15-21NG1HSM
BrandSick
£81.49
Each
Units
Optical Sensor Chassis Mount PNP Stainless Steel - - -25°C +55°C - - 100 mA 16bar - -
RS Stock No. 794-3392
Mfr. Part No.LFP2000-A4NMB
BrandSick
£340.34
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. 794-3395
Mfr. Part No.LFP0500-G1NMB
BrandSick
£619.11
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. 794-3409
Mfr. Part No.LFP2000-G1NMB
BrandSick
£728.37
Each
Units
Guided Radar Vertical 0-10 V, 4-20 mA Stainless Steel - IO-LINK -20°C +150°C - - 100 mA 16bar PEEK -
RS Stock No. 793-2816
Mfr. Part No.MHF15-21NG1NSM
BrandSick
£81.49
Each
Units
Optical Sensor Chassis Mount NPN Stainless Steel - - -25°C +55°C - - 100 mA 16bar - -
RS Stock No. 794-3383
Mfr. Part No.LFP1000-A4NMB
BrandSick
£340.34
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. 794-3399
Mfr. Part No.LFP1000-G1NMB
BrandSick
£728.37
Each
Units
Guided Radar Vertical 0-10 V, 4-20 mA Stainless Steel - IO-LINK -20°C +150°C - - 100 mA 16bar PEEK -
RS Stock No. 793-2828
Mfr. Part No.MHF15-21NG1TSM
BrandSick
£81.49
Each
Units
Optical Sensor Chassis Mount NPN Stainless Steel - - -25°C +55°C - - 100 mA 16bar - -
RS Stock No. 175-5065
Mfr. Part No.PFT-FRBX25SF1OSSAMSSZ
BrandSick
£297.87
Each
Units
Hydrostatic Level Sensor G1 Thread 2 Wire, 4 to 20 mA Stainless Steel 1.4571 - - -20°C +80°C - 30V 20 mA 0.25bar - -
RS Stock No. 175-5066
Mfr. Part No.PFT-FRBX40SF1OSSAMSSZ
BrandSick
£166.85
Each
Units
Hydrostatic Level Sensor G1 Thread 2 Wire, 4 to 20 mA Stainless Steel 1.4571 - - -20°C +80°C - 30V 20 mA 0.4bar - -
RS Stock No. 175-5063
Mfr. Part No.PFT-FRB1X0SF1OSSAMSSZ
BrandSick
£166.85
Each
Units
Hydrostatic Level Sensor G1 Thread 2 Wire, 4 to 20 mA Stainless Steel 1.4571 - - -20°C +80°C - 30V 20 mA 1bar - -
RS Stock No. 175-5061
Mfr. Part No.LFV200-XXSGBIPM
BrandSick
£193.27
Each
Units
Vibrating Level Switch G1/2 Thread PNP PEI, Stainless Steel 1.4404 - IO-LINK -40°C +70°C - 30V 250 mA 64bar - -
RS Stock No. 183-7325
Mfr. Part No.GRF18S-E234LV
BrandSick
£68.26
Each
Units
Optical Point Level Switch G1/2 Thread NPN Stainless Steel - - -25°C +55°C - 30V - 16bar - 30 mA
RS Stock No. 175-5058
Mfr. Part No.LFV200-XXHCLIPM
BrandSick
£299.65
Each
Units
Vibrating Level Switch 1.5 Triclamp Thread PNP PEI, Stainless Steel 1.4404 - IO-LINK -40°C +70°C - 30V 250 mA 64bar - -
RS Stock No. 183-7322
Mfr. Part No.GRF18S-P234LV
BrandSick
£68.26
Each
Units
Optical Point Level Switch G1/2 Thread PNP Stainless Steel - - -25°C +55°C - 30V - 16bar - 30 mA
RS Stock No. 175-5067
Mfr. Part No.UP56-213118
BrandSick
£554.46
Each
Units
Ultrasonic Level Sensor with display G1 Thread - PBT, Stainless Steel 1.4571, TPU - - -25°C +70°C - 30V 20 mA 6bar - -
RS Stock No. 175-5064
Mfr. Part No.PFT-FRBX10SF10SSAMSSZ
BrandSick
£297.87
Each
Units
Hydrostatic Level Sensor G1 Thread 2 Wire, 4 to 20 mA Stainless Steel 1.4571 - - -20°C +80°C - 30V 20 mA 0.1bar - -
RS Stock No. 175-5062
Mfr. Part No.LFV200-XXSGHIPM
BrandSick
£193.27
Each
Units
Vibrating Level Switch G3/4 Thread PNP PEI, Stainless Steel 1.4404 - IO-LINK -40°C +70°C - 30V 250 mA 64bar - -