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. 780-0179
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. 182-5619
Mfr. Part No.PS69.ARBXXCHXA2XXX
BrandVega
TWD112,527.00
Each
units
Level Sensor Slip on Flange or Bracket 2 Wire, 4 to 20 mA Coated Aluminium - - -40°C +80°C 253V 35V 22 mA 2bar - 4 → 20 mA
RS Stock No. 768-2038
Mfr. Part No.VIBS61.EEJ2RC
BrandVega
TWD24,667.00
Each
units
Sensor Cable Relay Stainless Steel - - -40°C +150°C - - 1 A dc, 3 A ac 1.1bar - -
RS Stock No. 124-0134
Mfr. Part No.LR15-0010-30
BrandFlowline
TWD86,920.00
Each
units
Pulse Radar Level Transmitter Flange Mount - Aluminium - - -60°C +150°C - 26V 20 mA 10.3bar Silicone 22.5 mA
RS Stock No. 889-1220
Mfr. Part No.LU29-00
BrandFlowline
TWD31,423.00
Each
units
Ultrasonic Level Transmitter Vertical - Polycarbonate 3m - -35°C +60°C - 24V 20 mA 30psi Viton -
RS Stock No. 493-6846
Mfr. Part No.FX-S.61C 2M
BrandVega
TWD6,760.00
Each
units
Radar - - PBT - - - - - - 20 mA 4bar - -
RS Stock No. 193-6745
Mfr. Part No.LLC600D3SH
TWD1,124.00
Each
units
Liquid Level Switch Threaded Mount Transistor Polysulfone - - -25°C +80°C - 15.4V 2.5 mA 7bar - 2.5 mA
RS Stock No. 144-2576
Mfr. Part No.7ML5202-0FA0
BrandSiemens
TWD37,997.00
Each
units
Ultrasonic Clamp Mount - PBT - - -40°C +60°C - 30V - - - 25 mA
RS Stock No. 193-6752
Mfr. Part No.LLC210D3L24-004
TWD1,795.00
Each
units
Liquid Level Switch Threaded Mount PNP Polysulfone - - -40°C +125°C - 30V 7.5 mA 7bar - 7.5 mA
RS Stock No. 780-0321
Mfr. Part No.OLS210D324-003
BrandCynergy3
TWD3,556.00
Each
units
Optical Sensor Chassis Mount Transistor Polysulfone 250mm - -40°C +125°C - - 1 A 7bar - -
RS Stock No. 768-2028
Mfr. Part No.VIBS61.EXX2RA
BrandVega
TWD17,895.00
Each
units
Sensor Cable Relay - - - -40°C +150°C - - 1 A dc, 3 A ac 1.1bar - -
RS Stock No. 463-5458
Mfr. Part No.3UG3207-1B
BrandSiemens
TWD3,189.00
Each
units
Electrode Vertical - - 2m - - +90°C - - - 10bar PTFE -
RS Stock No. 193-6798
Mfr. Part No.POS287412
TWD9,218.00
Each
units
Liquid Level Switch Threaded Mount NPN Stainless Steel 304 - - -25°C +140°C - 30V 25 mA 80bar - 25 mA
RS Stock No. 189-2704
Mfr. Part No.LBFH-21.010.A03020.1.0003.0
BrandBaumer
TWD5,563.00
Each
units
Level Switch Bottom Mount, Side Mount, Top Mount PNP Stainless Steel - IO-LINK -40°C +85°C - 36V 40 mA 10bar - 40 mA
RS Stock No. 889-1378
Mfr. Part No.DS14-01
BrandFlowline
TWD16,122.00
Each
units
Controller, Ultrasonic Level Switch Vertical - Polycarbonate 1.2m - -35°C +60°C 24V 24V - 30psi Viton 1 A
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. 804-4124
Mfr. Part No.7ML1100-0BA20
BrandSiemens
TWD28,823.00
Each
units
Vibrating Rod - - - - - -40 °C, -20 °C +60 °C, +73 °C - - - - - -
New
RS Stock No. 206-7075
Mfr. Part No.RA - 222 239
BrandVega
TWD24,170.00
Each
units
Ultrasonic/Radar Vertical HART Plastic 5m - - - - - - - - -
New
RS Stock No. 206-7074
Mfr. Part No.RA - 222 22H
BrandVega
TWD24,170.00
Each
units
Ultrasonic/Radar Vertical HART Plastic 15m - - - - - - - - -