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.

...
Read more Read less

Filters

Viewing 21 - 40 of 467 products
Results per page
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. 889-1166
Mfr. Part No.LU10-1405
BrandFlowline
TWD11,456.00
Each
units
Ultrasonic Level Switch Cable - Polypropylene 3m - -40°C +80°C - 36V - 150psi Viton 500 mA
RS Stock No. 354-335
Mfr. Part No.F0301SUS201ELECTRODE
BrandOmron
TWD719.00
Each
units
Electrode Chassis Mount - Stainless Steel - - - +70°C - - - - - -
RS Stock No. 193-6731
Mfr. Part No.LLC101000
TWD1,608.00
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. 780-0337
Mfr. Part No.OLS710D3L24-003
BrandCynergy3
TWD2,899.00
Each
units
Optical Sensor Chassis Mount Transistor Polysulfone 250mm - -40°C +125°C - - 1 A 7bar - -
RS Stock No. 859-3465
Mfr. Part No.VP01EP
TWD5,279.00
Each
units
- - - - - - -20°C +80°C - - - - - -
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. 892-9344
Mfr. Part No.2120D1AH1I1AA0000
BrandRosemount
TWD16,107.00
Each
units
Fork Level Switch Side or Top Mount - Glass Filled Nylon - - -40°C +150°C - - - 100bar Non Asbestos Carbon Fibre -
RS Stock No. 804-4121
Mfr. Part No.7ML1100-1BA30
BrandSiemens
TWD38,993.00
Each
units
Vibrating Rod - - - - - -40 °C, -20°C +60 °C, +73°C - - - - - -
RS Stock No. 182-5612
Mfr. Part No.PS69.AXBXXCHXKMXXX
BrandVega
TWD100,279.00
Each
units
Level Sensor Slip on Flange or Bracket 2 Wire, 4 to 20 mA PTB VALOX - - -40°C +80°C 253V 35V 22 mA 2bar - 4 → 20 mA
RS Stock No. 205-1301
Mfr. Part No.14241092
BrandWIKA
TWD9,990.00
Each
units
Optoelectronic Panel Mount PNP Stainless Steel - - - - - - - - - -
RS Stock No. 189-2702
Mfr. Part No.LBFS-01K21.0
BrandBaumer
TWD7,747.00
Each
units
Level Switch G 1/2" Fitting PNP Stainless Steel - - -40°C +85°C - 30V 50 mA 100bar - 20 mA
RS Stock No. 206-7064
Mfr. Part No.CP-222 3BH
BrandVega
TWD6,307.00
Each
units
Impedance Switch 1" G/BSP Thread PNP Stainless Steel - IO-LINK -40°C 115°C - 35V - 25bar Klingersil -
RS Stock No. 907-3883
Mfr. Part No.46999
TWD3,504.00
Each
units
Level Switch Vertical SPST NO Polysulfone 1.8m - -40°C +48.9°C 240V - - 50psi - -
RS Stock No. 361-1732
Mfr. Part No.LP01
TWD499.00
Each
units
Electrode Free - Stainless Steel, Vinyl - - - +70°C - - - - - -
RS Stock No. 889-1378
Mfr. Part No.DS14-01
BrandFlowline
TWD16,152.00
Each
units
Controller, Ultrasonic Level Switch Vertical - Polycarbonate 1.2m - -35°C +60°C 24V 24V - 30psi Viton 1 A
RS Stock No. 768-2003
Mfr. Part No.WAVES61.EXX2RC
BrandVega
TWD17,980.00
Each
units
Vibrating Level Switch Cable Relay - - - -40°C +150°C - - 1 A dc, 3 A ac 1.1bar - -
New
RS Stock No. 210-3164
Mfr. Part No.226552
TWD2,171.00
Each
units
Electro-Optic M12x1-8* Direct Load Housing = Polysulfone (Contact Gems for alternative material types)Prism = PolysulfoneO-Ring = Fluorocarbon (1/4? MNPT - None)Electronics = Over-molded TPE 119.8mm - - - - - - - - -
RS Stock No. 613-3409
Mfr. Part No.SN62.CXAGHKMX
BrandVega
TWD57,753.00
Each
units
Ultrasonic - - Plastic - - -40°C +80°C - - 20 mA 2bar - -
RS Stock No. 901-0299
Mfr. Part No.PS61.XXBXXHKMXX
BrandVega
TWD72,009.00
Each
units
Radar Sensor Panel Mount HART Polypropylene - - -40°C +80°C 253V 48V 20 mA 3bar FPM 4 → 20 mA
RS Stock No. 182-5619
Mfr. Part No.PS69.ARBXXCHXA2XXX
BrandVega
TWD112,207.00
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