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. 493-7186
Mfr. Part No.7ML5221-1BB11
BrandSiemens
R 17,571.60
Each
units
Ultrasonic - - PBT - - -40°C +85°C - - 20 mA - - -
RS stock no. 493-6802
Mfr. Part No.SG51.XXSGBTPV
BrandVega
R 3,997.59
Each
units
Tuning Fork Horizontal PNP Stainless Steel - - -40°C +100°C - - 250 mA 64bar - -
RS stock no. 616-3006
Mfr. Part No.208998
R 793.25
Each
units
Electro Optic Horizontal, Vertical - Polyethersulfone - - -40°C +125°C - - 18 mA 250psi - -
RS stock no. 780-0175
Mfr. Part No.SSF22X100-18N
BrandCynergy3
R 1,163.31
Each
units
Level Switch Vertical - Stainless Steel 1m - -20°C +120°C - - 500 mA 10bar - -
RS stock no. 613-3415
Mfr. Part No.SN61.CXAGHKMX
BrandVega
R 25,551.48
Each
units
Ultrasonic Vertical - Plastic - - -40°C +80°C - - 20 mA 2bar EPDM Rubber -
RS stock no. 793-2825
Mfr. Part No.MHF15-21NG1HSM
BrandSick
R 2,340.20
Each
units
Optical Sensor Chassis Mount PNP Stainless Steel - - -25°C +55°C - - 100 mA 16bar - -
RS stock no. 493-6852
Mfr. Part No.PS61.XXAGPHKMXX
BrandVega
R 35,012.13
Each
units
Radar Vertical - Plastic - - -40°C +80°C - - 20 mA 2bar - -
RS stock no. 892-9757
Mfr. Part No.3101LP3FSCNA
R 14,408.08
Each
units
Level Transmitter Top Mount 4-20mA Glass Filled Nylon - - -20°C +70°C - 30V 21.75 mA 3bar - -
RS stock no. 185-9881
Mfr. Part No.S01DB/F21/1
R 11,662.34
Each
units
Liquid Level Switch Top Mount SPST Aluminium Bronze - - - +210°C - - 2 A dc, 5 A ac 18bar Non Asbestos Sheet -
RS stock no. 889-1340
Mfr. Part No.DL14-00
BrandFlowline
R 7,765.94
Each
units
Multi Function Ultrasonic Transmitter Vertical Relay Polycarbonate 1.2m - -35°C +60°C - 24V 20 mA 30psi Viton -
RS stock no. 613-3409
Mfr. Part No.SN62.CXAGHKMX
BrandVega
R 28,558.56
Each
units
Ultrasonic - - Plastic - - -40°C +80°C - - 20 mA 2bar - -
RS stock no. 354-290
Mfr. Part No.PS31SUS3041000MM
BrandOmron
R 691.60
1 Kit
Kit(s)
Electrode Chassis Mount - Phenol Resin, Stainless Steel - - - +70°C - - - - - -
RS stock no. 780-0179
Mfr. Part No.SSF22X100-M12X1
BrandCynergy3
R 1,403.68
Each
units
Level Switch Vertical - Stainless Steel 1m - -20°C +120°C - - 500 mA 10bar - -
RS stock no. 204-6749
Mfr. Part No.003S2
R 6,771.25
Each
units
Gap Sensor Level Alarm Switch Horizontal, Vertical Relay Polyphenylene Sulfide 3m - -20°C +70°C - - 1 A 5bar - -
RS stock no. 889-1393
Mfr. Part No.DX10-00-8FT
BrandFlowline
R 6,351.49
Each
units
Ultrasonic Level Sensor Vertical - Polycarbonate 1.2m - -35°C +60°C - 24V 15 (Nominal) mA 30psi Viton -
RS stock no. 386-957
Mfr. Part No.WAVES61.EXX2RA
BrandVega
R 7,929.57
Each
units
Tuning Fork Horizontal Relay Aluminium/PBT - - -40°C +80°C - - 1 A dc, 3 A ac 25bar - -
RS stock no. 616-2996
Mfr. Part No.208997
R 1,043.71
Each
units
Electro Optic Horizontal, Vertical - Polyethersulfone 150mm - -40°C +125°C - - 18 mA 250psi - -
RS stock no. 616-3028
Mfr. Part No.208995
R 793.25
Each
units
Electro Optic Horizontal, Vertical - Polyethersulfone - - -40°C +125°C - - 18 mA 250psi - -
RS stock no. 869-7725
Mfr. Part No.ILTS-G1000-015
BrandCynergy3
R 8,047.84
Each
units
Pressure Cable - Stainless Steel 15m - -20°C +60°C - 32V 28 mA 50bar - -
RS stock no. 804-4137
Mfr. Part No.7ML1115-3CA30
BrandSiemens
R 10,845.88
Each
units
Ultrasonic - - - - - -20°C +95°C - - - - - -