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. 768-2072
Mfr. Part No.TRENN149AEX.X
BrandVega
£200.21
Each
Units
Sensor DIN Rail - - - - - - - - 20 mA - - -
RS Stock No. 746-7526
Mfr. Part No.1SVR402902R0000
BrandABB
£17.97
Each
Units
Electrode - - Steel - - - - - - - - - -
RS Stock No. 780-0179
Mfr. Part No.SSF22X100-M12X1
BrandCynergy3
£61.77
Each
Units
Level Switch Vertical - Stainless Steel 1m - -20°C +120°C - - 500 mA 10bar - -
RS Stock No. 794-3392
Mfr. Part No.LFP2000-A4NMB
BrandSick
£371.67
Each
Units
Guided Radar Vertical 0-10 V, 4-20 mA PBT - IO-LINK -20°C +100°C - - 100 mA 10bar PTFE -
RS Stock No. 124-0123
Mfr. Part No.LU27-01
BrandFlowline
£322.20
Each
Units
Ultrasonic Level Transmitter Vertical - PC 3m - -35°C +60°C - 24V 20 mA 2bar FKM -
RS Stock No. 869-7643
Mfr. Part No.ILLS-G0100-5-003
BrandCynergy3
£192.49
Each
Units
Pressure Cable 4-20mA Stainless Steel 3m - -20°C +60°C - 32V 28 mA 20bar - -
RS Stock No. 794-3395
Mfr. Part No.LFP0500-G1NMB
BrandSick
£748.94
Each
Units
Sensor Vertical 0-10 V, 4-20 mA Stainless Steel 500mm IO-LINK -20°C +150°C - - 100 mA 16bar PEEK -
RS Stock No. 892-9763
Mfr. Part No.03100-1003-0002
BrandRosemount
£84.46
Each
Units
BSP Bracket Flange Mount - - - - - - - - - - - -
RS Stock No. 756-4289
Mfr. Part No.RSF88H100R
BrandCynergy3
£15.14
Each
Units
Sensor Horizontal External NO/NC Polypropylene 1m - -20°C +100°C - - 1 A - - -
RS Stock No. 377-9816
Mfr. Part No.VC5510PNOP
£44.58
Each
Units
Capacitance Switch Chassis Mount PNP ABS/Polycarbonate 1.5m - 0°C +50°C - 30V 100 mA - - -
RS Stock No. 857-3360
Mfr. Part No.VNY3
£195.49
Each
Units
Conductive Chassis Mount Relay Nylon 6 2m - 0°C +90°C - - - 10bar - -
RS Stock No. 616-2996
Mfr. Part No.208997
£35.60
Each
Units
Electro Optic Horizontal, Vertical - Polyethersulfone 150mm - -40°C +125°C - - 18 mA 250psi - -
RS Stock No. 857-3212
Mfr. Part No.VPC310
£164.37
Each
Units
Conductive Chassis Mount Relay PVC 2m - 0°C +60°C - - - 2bar - -
RS Stock No. 113-705
Mfr. Part No.7ML5430-2BA10
BrandSiemens
£1,316.00
Each
Units
Radar Vertical - PBT - - -40°C +80°C - - 20 mA 30bar - -
RS Stock No. 768-1962
Mfr. Part No.SONS61.EEEA
BrandVega
£688.74
Each
Units
Vibrating Rod - Relay - - - - - - - 20 mA - - -
RS Stock No. 768-1971
Mfr. Part No.SONS62.EXXX
BrandVega
£683.09
Each
Units
Vibrating Rod Chassis Mount - ABS - - -40°C +80°C - - 20 mA - - -
RS Stock No. 124-0138
Mfr. Part No.LV10-1301
BrandFlowline
£114.75
Each
Units
Buoyancy Level Switch Vertical NO/NC PP 3m - -40°C +90°C - - - 2bar - 250 mA
RS Stock No. 768-2056
Mfr. Part No.BARS16.E1EV
BrandVega
£348.75
Each
Units
Capacitance Flush Mount Relay Ceramic - - - +100°C - - 20 mA 1bar - -
RS Stock No. 768-1980
Mfr. Part No.WELLS51.EC
BrandVega
£526.36
Each
Units
Sensor Suspension - Stainless Steel - - -40°C +80°C - - 20 mA - - -
RS Stock No. 804-4137
Mfr. Part No.7ML1115-3CA30
BrandSiemens
£477.04
Each
Units
Ultrasonic - - - - - -20°C +95°C - - - - - -
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