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
New
RS Stock No. 193-6735
Mfr. Part No.LLC101101
PHP3,078.89
Each
units
Liquid Level Switch Threaded Mount Transistor Polysulfone - - -40°C +125°C - 15.4V 2.5 mA 7bar - 2.5 mA
RS Stock No. 175-5066
Mfr. Part No.PFT-FRBX40SF1OSSAMSSZ
BrandSick
PHP22,630.00
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 - -
New
RS Stock No. 193-6741
Mfr. Part No.LLC210D3SH
PHP2,151.51
Each
units
Liquid Level Switch Threaded Mount Transistor Polysulfone - - -40°C +125°C - 15.4V 2.5 mA 7bar - 2.5 mA
RS Stock No. 183-7324
Mfr. Part No.GRF18S-N234LV
BrandSick
PHP5,064.21
Each
units
Optical Point Level Switch G1/2 Thread NPN Stainless Steel - - -25°C +55°C - 30V - 16bar - 30 mA
RS Stock No. 780-0318
Mfr. Part No.OLS200D3LSH
BrandCynergy3
PHP2,446.70
Each
units
Optical Sensor Chassis Mount Transistor Polysulfone 250mm - -25°C +80°C - - 100 mA 7bar - -
RS Stock No. 892-9381
Mfr. Part No.5301HA2S1V5AM01000SANAW2
BrandRosemount
PHP117,340.39
Each
units
Guided Wave Radar Top Mount - Polyurethane-covered Aluminium 10m - -15°C +150°C - 42.4V - 40bar - -
RS Stock No. 869-7643
Mfr. Part No.ILLS-G0100-5-003
BrandCynergy3
PHP13,440.12
Each
units
Pressure Cable 4-20mA Stainless Steel 3m - -20°C +60°C - 32V 28 mA 20bar - -
New
RS Stock No. 193-6731
Mfr. Part No.LLC101000
PHP2,596.65
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. 177-9130
Mfr. Part No.9038CG36LZ20
PHP16,984.00
Each
units
Mechanical Alternator Screw In - Painted Cold-Rolled Steel - - -22°F +220°F 230 (Single Phase) V, 475 (3 Phase) V 230V - - - -
RS Stock No. 137-2050
Mfr. Part No.UG06-0001-41
BrandFlowline
PHP58,830.00
Each
units
Reflective Ultrasonic Liquid Level Transmitter Horizontal, Vertical 2 Wire, 4 to 20 mA Polycarbonate (Cap), Polypropylene - - -40°C +80°C - 28V 20 mA 2bar - -
New
RS Stock No. 193-6769
Mfr. Part No.LLG810D324-004
PHP8,606.04
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. 122-8431
Mfr. Part No.232178
PHP10,342.83
Each
units
Electro Optic Vertical/Horizontal NC Brass 6in - -40°C +110°C - 12V - 17bar - 10 mA
New
RS Stock No. 193-6799
Mfr. Part No.POS287413
PHP15,208.95
Each
units
Liquid Level Switch Threaded Mount PNP Stainless Steel 304 - - -25°C +140°C - 30V 25 mA 80bar - 25 mA
New
RS Stock No. 193-6780
Mfr. Part No.LLG210D324-004-D
PHP12,241.35
Each
units
Liquid Level Switch Threaded Mount PNP Stainless Steel 316L - - -40°C +125°C - 30V 7.5 mA 100bar - 7.5 mA
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