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. 124-0135
Mfr. Part No.LR20-0310-30
BrandFlowline
TWD95,059.00
Each
units
Pulse Radar Level Transmitter Flange Mount - Aluminium - - -40°C +150°C - 26V 20 mA 5bar Silicone 22.5 mA
RS Stock No. 907-3883
Mfr. Part No.46999
TWD3,514.00
Each
units
Level Switch Vertical SPST NO Polysulfone 1.8m - -40°C +48.9°C 240V - - 50psi - -
RS Stock No. 124-0124
Mfr. Part No.LU23-01
BrandFlowline
TWD22,154.00
Each
units
Ultrasonic Level Transmitter Vertical - PC - - -35°C +60°C - 24V 20 mA 2bar FKM -
RS Stock No. 193-6769
Mfr. Part No.LLG810D324-004
TWD5,216.00
Each
units
Liquid Level Switch Threaded Mount PNP Stainless Steel 316L - - -40°C +125°C - 30V 7.5 mA 600bar - 7.5 mA
RS Stock No. 804-3850
Mfr. Part No.7ML5501-0EA70
BrandSiemens
TWD12,051.00
Each
units
Capacitance Switch Vertical Relay Stainless Steel - - -30°C +100°C - - - 10bar - -
RS Stock No. 906-8165
Mfr. Part No.160950
TWD1,179.00
Each
units
Level Switch Horizontal SPST Zinc Alloy 24in - -40°C +121°C - - - 100psi - -
RS Stock No. 889-1182
Mfr. Part No.LU23-40
BrandFlowline
TWD26,810.00
Each
units
Ultrasonic Level Transmitter Vertical - Polycarbonate 4.6m - -35°C +60°C - 24V 20 mA 30psi Viton -
RS Stock No. 193-6757
Mfr. Part No.LLC710D324-003
TWD1,795.00
Each
units
Liquid Level Switch Threaded Mount NPN Polysulfone - - -40°C +125°C - 30V 7.5 mA 7bar - 7.5 mA
RS Stock No. 776-1597
Mfr. Part No.072.01.06
BrandFinder
TWD451.00
Each
units
Electrode Vertical Relay - 6m - 0°C +100°C - - - - - -
RS Stock No. 780-0179
Mfr. Part No.SSF22X100-M12X1
BrandCynergy3
TWD2,778.00
Each
units
Level Switch Vertical - Stainless Steel 1m - -20°C +120°C - - 500 mA 10bar - -
RS Stock No. 193-6744
Mfr. Part No.LLC510D3
TWD1,304.00
Each
units
Liquid Level Switch Threaded Mount Transistor Polysulfone - - -40°C +125°C - 15.4V 2.5 mA 20bar - 2.5 mA
RS Stock No. 124-0136
Mfr. Part No.LR30-0010-10
BrandFlowline
TWD102,255.00
Each
units
Pulse Radar Level Transmitter Flange Mount - Nylon 10m - -40°C +100°C - 26V 20 mA - Silicone 22.5 mA
RS Stock No. 175-5066
Mfr. Part No.PFT-FRBX40SF1OSSAMSSZ
BrandSick
TWD16,800.00
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. 613-3522
Mfr. Part No.SG51.XXSGATPV
BrandVega
TWD8,608.00
Each
units
Tuning Fork Horizontal PNP Stainless Steel - - -40°C +100°C - - 250 mA 64bar - -
RS Stock No. 498-7349
Mfr. Part No.VB61.XXAGDRKMX
BrandVega
TWD28,010.00
Each
units
Vibrating Rod Free Relay Plastic - - -50°C +150°C - - 1 A dc, 3 A ac 16bar - -
RS Stock No. 144-9331
Mfr. Part No.84800017
BrandXylem
TWD24,952.00
Each
units
10 Sensor Probe 2 m Bracket Mounted - - - - - - - - - - - -
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. 613-3409
Mfr. Part No.SN62.CXAGHKMX
BrandVega
TWD57,917.00
Each
units
Ultrasonic - - Plastic - - -40°C +80°C - - 20 mA 2bar - -
RS Stock No. 468-3479
Mfr. Part No.SN61XXAGHKMA
BrandVega
TWD47,219.00
Each
units
Ultrasonic - - Plastic - - -40°C +80°C - - 20 mA 2bar - -
RS Stock No. 794-3437
Mfr. Part No.2120D1AV1NAAA0000
TWD10,444.00
Each
units
Fork Level Switch Side or Top Mount Relay Glass Filled Nylon - - -40°C +150°C - - 500 mA 100bar Non Asbestos Sheet -