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 Minimum Operating Temperature Maximum Operating Temperature Maximum AC Voltage Maximum DC Voltage Maximum Current Maximum Pressure Gasket Material Current Rating Hazardous Area Certification
RS Stock No. 419-4654
Mfr. Part No.SWING61XXGBVXPRX
BrandVega
HK$4,463.78
Each
units
Vibrating Rod Horizontal, Vertical Relay Plastic - -50°C +150°C - - 1 A dc, 3 A ac 64bar - - -
RS Stock No. 794-3424
Mfr. Part No.2120D1AT1NAAM0150
BrandRosemount
HK$5,013.53
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. 124-0125
Mfr. Part No.LU28-01
BrandFlowline
HK$6,234.88
Each
units
Ultrasonic Level Transmitter Vertical - PC 3m -35°C +60°C - 24V 20 mA 2bar FKM - -
RS Stock No. 780-0298
Mfr. Part No.SM20
BrandCynergy3
HK$609.62
Each
units
- - - - - 0°C +50°C - - - - - - -
New
RS Stock No. 193-6766
Mfr. Part No.LLG610D3L24-004
HK$1,146.65
Each
units
Liquid Level Switch Threaded Mount PNP Stainless Steel 316L - -40°C +125°C - 30V 7.5 mA 100bar - 7.5 mA -
RS Stock No. 768-2006
Mfr. Part No.WAVES61.EXX2RD
BrandVega
HK$4,899.21
Each
units
Vibrating Level Switch Cable Relay - - -40°C +150°C - - 1 A dc, 3 A ac 1.1bar - - -
RS Stock No. 182-5610
Mfr. Part No.PS64.AXBXXCHXKMXXX
BrandVega
HK$22,510.55
Each
units
Level Sensor Slip on Flange or Bracket 2 Wire, 4 to 20 mA PTB VALOX - -40°C +80°C - 35V 22 mA 2bar - 4 → 20 mA ATEX
New
RS Stock No. 193-6750
Mfr. Part No.LLC210D3L24-003
HK$481.59
Each
units
Liquid Level Switch Threaded Mount NPN Polysulfone - -40°C +125°C - 30V 7.5 mA 7bar - 7.5 mA -
New
RS Stock No. 188-5255
Mfr. Part No.CD34CNFLFPOT5
HK$726.01
Each
units
Conductive Plug PNP Plastic 300mm -25°C +80°C - 30V 13 mA - - 100 mA -
RS Stock No. 122-8432
Mfr. Part No.232179
HK$1,374.44
Each
units
Electro Optic Vertical/Horizontal NO Brass 6in -40°C +110°C - 5V - 17bar - 4 mA -
RS Stock No. 776-1601
Mfr. Part No.072.02.06
BrandFinder
HK$131.47
Each
units
Electrode Vertical Relay Stainless Steel 6m 0°C +100°C - - - - - - -
RS Stock No. 182-5618
Mfr. Part No.PS64.ACTTCAHXKMXXX
BrandVega
HK$32,733.84
Each
units
Level Sensor 1.5 BSP/G Thread 2 Wire, 4 to 20 mA PTB VALOX - -40°C +130°C - 35V 22 mA 20bar - 4 → 20 mA -
RS Stock No. 907-3937
Mfr. Part No.79999
HK$1,332.46
Each
units
Level Switch Vertical SPST NO Stainless Steel 600mm -40°C +249°C - - - 750psi - - -
New
RS Stock No. 191-9484
BrandRS PRO
HK$154.86
Each
units
Float External NO/NC Polypropylene 1m -10°C +120°C 240V 120V 600 mA - Nitrile 600 mA -
New
RS Stock No. 191-9515
BrandRS PRO
HK$1,565.96
Each
units
Float Internal NO/NC Stainless Steel 1m - +135°C 250V 120V 600 mA 10bar - 600 mA -
New
RS Stock No. 191-9499
BrandRS PRO
HK$135.91
Each
units
Float Vertical NO/NC Nylon - -20°C +75°C 240V 120V 600 mA - Nitrile 600 mA -
RS Stock No. 780-0315
Mfr. Part No.OLS700D3LSH
BrandCynergy3
HK$270.69
Each
units
Optical Sensor Chassis Mount Transistor Polysulfone 250mm -25°C +80°C - - 100 mA 7bar - - -
New
RS Stock No. 193-6777
Mfr. Part No.LLG710D3L24-003
HK$1,146.65
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. 889-1444
Mfr. Part No.LC92-1001
BrandFlowline
HK$4,080.51
Each
units
Remote Level Controller DIN Rail NO/NC, SPDT Relay Polypropylene - -40°C +70°C - 13.5V 27 mA - - - -
RS Stock No. 804-4159
Mfr. Part No.7ML1106-1BA200A
BrandSiemens
HK$5,147.39
Each
units
Ultrasonic - - - - -20°C +65°C - - - - - - -
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