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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Beskrivning Pris 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-artikelnummer 794-3434
Tillv. art.nr211010A1NA
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Gap Sensor Level Alarm Switch Horizontal, Vertical Relay Polyphenylene Sulfide 3m - -20°C +70°C - - 1 A 5bar - -
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Sensor Surface Mount Relay Stainless Steel 200m - 0°C +100°C - - 30 A - - -
RS-artikelnummer 794-3395
Tillv. art.nrLFP0500-G1NMB
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Sensor Vertical 0-10 V, 4-20 mA Stainless Steel 500mm IO-LINK -20°C +150°C - - 100 mA 16bar PEEK -
RS-artikelnummer 616-3006
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Electro Optic Horizontal, Vertical - Polyethersulfone - - -40°C +125°C - - 18 mA 250psi - -
RS-artikelnummer 377-9894
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Conductive - - Nylon 6 2m - 0°C +90°C - - - 10bar - -
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Conductive Chassis Mount Relay Nylon 6 2m - 0°C +90°C - - - 10bar - -
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TDR Sensor Cable HART Stainless Steel 75m - -40°C +80°C 253V 48V 20 mA 40bar EPDM Rubber, FFKM, FKM 4 → 20 mA
RS-artikelnummer 776-1601
Tillv. art.nr072.02.06
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Electrode Vertical Relay Stainless Steel 6m - 0°C +100°C - - - - - -
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Tuning Fork Horizontal Relay Aluminium/PBT - - -40°C +80°C - - 1 A dc, 3 A ac 25bar - -
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Ultrasonic Level Transmitter Vertical - Polycarbonate 1.2m - -35°C +60°C - 24V 20 mA 30psi Viton -
RS-artikelnummer 204-6733
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Gap Sensor Level Alarm Switch Horizontal, Vertical FET Polyphenylene Sulfide 3m - -40°C +105°C - - 100 mA 5bar - -
RS-artikelnummer 793-2825
Tillv. art.nrMHF15-21NG1HSM
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Optical Sensor Chassis Mount PNP Stainless Steel - - -25°C +55°C - - 100 mA 16bar - -
RS-artikelnummer 498-7349
Tillv. art.nrVB61.XXAGDRKMX
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Vibrating Rod Free Relay Plastic - - -50°C +150°C - - 1 A dc, 3 A ac 16bar - -
RS-artikelnummer 776-1608
Tillv. art.nr072.31
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Electrode Vertical Relay Stainless Steel - - 0°C +80°C - - - - - -
RS-artikelnummer 354-290
Tillv. art.nrPS31SUS3041000MM
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