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. 768-1962
Mfr. Part No.SONS61.EEEA
BrandVega
TWD40,410.00
Each
units
Vibrating Rod - Relay - - - - - - - 20 mA - - -
RS Stock No. 439-0082
Mfr. Part No.SLX4
BrandTempatron
TWD921.00
Each
units
- PCB Mount NPN - - - -20°C +65°C - - 50 mA - - -
RS Stock No. 193-6790
Mfr. Part No.LLG210D3L24-003-D
TWD7,914.00
Each
units
Liquid Level Switch Threaded Mount NPN Stainless Steel 316L - - -40°C +125°C - 30V 7.5 mA 100bar - 7.5 mA
RS Stock No. 175-5068
Mfr. Part No.UP56-214178
BrandSick
TWD39,600.00
Each
units
Ultrasonic Level Sensor with display G2 Thread 0-10, PNP, 4 to 20 mA PBT, PVDF, TPU - - -25°C +70°C - 30V 20 mA 6bar - -
New
RS Stock No. 206-7069
Mfr. Part No.RA - 222 22J
BrandVega
TWD17,773.00
Each
units
Ultrasonic/Radar Vertical HART Plastic 8m - - - - - - - - -
New
RS Stock No. 201-0780
Mfr. Part No.VPC205
TWD2,785.00
Each
units
Conductive Sensor Threaded Relay PVC 500mm - - - - - - - - -
RS Stock No. 794-3421
Mfr. Part No.2120D1AT1NAAA0000
TWD13,055.00
Each
units
Fork Level Switch Side or Top Mount Direct Load Glass Filled Nylon - - -40°C +150°C - - 500 mA 100bar Non Asbestos Sheet -
RS Stock No. 889-1431
Mfr. Part No.LC42-1001
BrandFlowline
TWD8,791.00
Each
units
Remote Level Controller DIN Rail NO/NC, SPDT Relay Polypropylene - - -40°C +70°C - 13.5V 27 mA - - -
RS Stock No. 780-0337
Mfr. Part No.OLS710D3L24-003
BrandCynergy3
TWD2,884.00
Each
units
Optical Sensor Chassis Mount Transistor Polysulfone 250mm - -40°C +125°C - - 1 A 7bar - -
RS Stock No. 768-2066
Mfr. Part No.MET381.XX
BrandVega
TWD19,063.00
Each
units
Sensor Rail Mounting, Wall Mount Relay Plastic - - -20°C +60°C - - 20 mA - - -
RS Stock No. 122-8419
Mfr. Part No.010-3462
TWD12,316.00
Each
units
Level Switch Side SPST NO Stainless Steel 1m - -40°C +150°C - - - 35bar - -
RS Stock No. 354-335
Mfr. Part No.F0301SUS201ELECTRODE
BrandOmron
TWD721.00
Each
units
Electrode Chassis Mount - Stainless Steel - - - +70°C - - - - - -
RS Stock No. 175-5062
Mfr. Part No.LFV200-XXSGHIPM
BrandSick
TWD12,700.00
Each
units
Vibrating Level Switch G3/4” Thread PNP PEI, Stainless Steel 1.4404 - IO-LINK -40°C +70°C - 30V 250 mA 64bar - -
RS Stock No. 137-2040
Mfr. Part No.LR16-5021-20-01
BrandFlowline
TWD125,005.00
Each
units
Pulse Radar Liquid Level Transmitter Vertical HART 7, 2 Wire, 4 to 20 mA Stainless Steel 316L - - -40°C +150°C - 26.4V 20 mA 10bar Silicone 22.5 mA
RS Stock No. 488-037
Mfr. Part No.LR7000
TWD13,017.00
Each
units
- - PNP Stainless Steel/FKM/NBR/PB/PC/PEI/TPE/PTFE - - 0°C +60°C - - 200 mA 4bar - -
New
RS Stock No. 206-7071
Mfr. Part No.RA - 222 229
BrandVega
TWD27,733.00
Each
units
Ultrasonic/Radar Vertical HART Plastic 15m - - - - - - - - -
RS Stock No. 776-1591
Mfr. Part No.072.01.15
BrandFinder
TWD1,074.00
Each
units
Electrode Vertical Relay - 15m - 0°C +100°C - - - - - -
RS Stock No. 377-9894
Mfr. Part No.VN4
TWD7,397.00
Each
units
Conductive - - Nylon 6 2m - 0°C +90°C - - - 10bar - -
RS Stock No. 889-1330
Mfr. Part No.DL10-00
BrandFlowline
TWD13,566.00
Each
units
Ultrasonic Level Transmitter Vertical - Polycarbonate 1.2m - -35°C +60°C - 24V 20 mA 30psi Viton -
RS Stock No. 189-2705
Mfr. Part No.LBFH-21.010.A03020.1.4003.0
BrandBaumer
TWD7,654.00
Each
units
Level Switch Bottom Mount, Side Mount, Top Mount PNP Stainless Steel - IO-LINK -40°C +85°C - 30V 100 mA 10bar - 100 mA