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. 493-6852
Mfr. Part No.PS61.XXAGPHKMXX
BrandVega
SGD3,144.90
Each
units
Radar Vertical - Plastic - - -40°C +80°C - - 20 mA 2bar - -
RS Stock No. 613-3415
Mfr. Part No.SN61.CXAGHKMX
BrandVega
SGD2,299.36
Each
units
Ultrasonic Vertical - Plastic - - -40°C +80°C - - 20 mA 2bar EPDM Rubber -
RS Stock No. 419-4660
Mfr. Part No.SWING61XXGAVXPRX
BrandVega
SGD826.14
Each
units
Vibrating Fork Horizontal, Vertical Relay Plastic - - -50°C +150°C - - 1 A dc, 3 A ac 64bar - -
RS Stock No. 613-3386
Mfr. Part No.SG51.XXTGATPVL
BrandVega
SGD465.91
Each
units
Tuning Fork Horizontal PNP Stainless Steel - - -40°C +150°C - - 20 mA 64bar - -
RS Stock No. 901-0289
Mfr. Part No.FX81.IXETBFHXKMXX
BrandVega
SGD2,128.60
Each
units
TDR Sensor Cable HART Stainless Steel 75m - -40°C +80°C 253V 48V 20 mA 40bar EPDM Rubber, FFKM, FKM 4 → 20 mA
RS Stock No. 768-2072
Mfr. Part No.TRENN149AEX.X
BrandVega
SGD401.20
Each
units
Sensor DIN Rail - - - - - - - - 20 mA - - -
RS Stock No. 493-6802
Mfr. Part No.SG51.XXSGBTPV
BrandVega
SGD355.92
Each
units
Tuning Fork Horizontal PNP Stainless Steel - - -40°C +100°C - - 250 mA 64bar - -
RS Stock No. 768-2081
Mfr. Part No.PSWL61.XXBXXHKAX
BrandVega
SGD1,865.81
Each
units
Radar Cable - - 6m - -20°C +60°C - - 131 mA - - -
RS Stock No. 387-0379
Mfr. Part No.KON66.XG3VPR
BrandVega
SGD705.35
Each
units
Conductive Vertical Relay Plastic - - -40°C +100°C - - 1 A dc, 3 A ac 6bar - -
RS Stock No. 768-2019
Mfr. Part No.WAVES61.EEJ2RC
BrandVega
SGD970.88
Each
units
Vibrating Level Switch Cable Relay - - - -40°C +150°C - - 1 A dc, 3 A ac 1.1bar - -
RS Stock No. 386-957
Mfr. Part No.WAVES61.EXX2RA
BrandVega
SGD617.94
Each
units
Tuning Fork Horizontal Relay Aluminium/PBT - - -40°C +80°C - - 1 A dc, 3 A ac 25bar - -
RS Stock No. 468-3479
Mfr. Part No.SN61XXAGHKMA
BrandVega
SGD2,094.46
Each
units
Ultrasonic - - Plastic - - -40°C +80°C - - 20 mA 2bar - -
RS Stock No. 539-5735
Mfr. Part No.CP64.XXFGARKMX L=300
BrandVega
SGD1,842.08
Each
units
Capacitance Horizontal, Vertical Relay PTFE - - -50°C +200°C - - 1 A dc, 3 A ac 64bar - -
RS Stock No. 468-3463
Mfr. Part No.SN61XXAGHKMX
BrandVega
SGD1,842.08
Each
units
Ultrasonic - - Plastic - - -40°C +80°C - - 20 mA 2bar - -
RS Stock No. 387-0341
Mfr. Part No.CAP98XPXD
BrandVega
SGD632.01
Each
units
Capacitance Horizontal, Vertical Relay Polypropylene - - -30°C +80°C - - 1 A dc, 3 A ac - - -
RS Stock No. 613-3522
Mfr. Part No.SG51.XXSGATPV
BrandVega
SGD381.80
Each
units
Tuning Fork Horizontal PNP Stainless Steel - - -40°C +100°C - - 250 mA 64bar - -
RS Stock No. 768-2056
Mfr. Part No.BARS16.E1EV
BrandVega
SGD698.87
Each
units
Capacitance Flush Mount Relay Ceramic - - - +100°C - - 20 mA 1bar - -
RS Stock No. 768-1956
Mfr. Part No.SONS61.EXXX
BrandVega
SGD1,072.04
Each
units
Vibrating Rod - Relay - - - - - - - 20 mA - - -
RS Stock No. 768-1971
Mfr. Part No.SONS62.EXXX
BrandVega
SGD1,368.84
Each
units
Vibrating Rod Chassis Mount - ABS - - -40°C +80°C - - 20 mA - - -
RS Stock No. 768-1993
Mfr. Part No.WELLS51.EE
BrandVega
SGD1,028.90
Each
units
Sensor Suspension - Stainless Steel - - -40°C +80°C - - 20 mA - - -