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. 204-6749
Mfr. Part No.003S2
SGD446.69
Each
units
Gap Sensor Level Alarm Switch Horizontal, Vertical Relay Polyphenylene Sulfide 3m - -20°C +70°C - - 1 A 5bar - -
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. 354-290
Mfr. Part No.PS31SUS3041000MM
BrandOmron
SGD44.21
1 Kit
Kit(s)
Electrode Chassis Mount - Phenol Resin, Stainless Steel - - - +70°C - - - - - -
RS Stock No. 185-9853
Mfr. Part No.S01DB/F68/1
SGD797.51
Each
units
Liquid Level Switch Side Mount SPST Aluminium Bronze - - - +210°C - - 2 A dc, 5 A ac 18bar Non Asbestos Sheet -
RS Stock No. 354-335
Mfr. Part No.F0301SUS201ELECTRODE
BrandOmron
SGD32.10
Each
units
Electrode Chassis Mount - Stainless Steel - - - +70°C - - - - - -
RS Stock No. 804-3850
Mfr. Part No.7ML5501-0EA70
BrandSiemens
SGD490.05
Each
units
Capacitance Switch Vertical Relay Stainless Steel - - -30°C +100°C - - - 10bar - -
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. 857-3168
Mfr. Part No.CLD2EA1CM24
SGD418.45
Each
units
Conductive DIN Rail DPDT Relay ABS 100m - -20°C +50°C - - 8 A - - -
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. 122-4867
Mfr. Part No.LVL-A7-AG3A-E5PU-NA
SGD261.00
Each
units
Limit Switch Flush Mount PNP Stainless Steel 316L 5m - -40°C +70°C - 35V 250 mA 40bar - <15 (DC-PNP) mA
RS Stock No. 513-2427
Mfr. Part No.7ML5610-0BD20
BrandSiemens
SGD236.40
Each
units
Capacitance - Relay Polyphenylene Sulfide - - -40°C +85°C - - 20 mA 10bar - -
RS Stock No. 122-8416
Mfr. Part No.090-0024
SGD196.32
Each
units
Level Switch Side - Brass 1m - -40°C +100°C - - - 16bar - -
RS Stock No. 794-3430
Mfr. Part No.2120D1AT1E1XA0000
SGD851.78
Each
units
Fork Level Switch Side or Top Mount Direct Load Aluminium - - -40°C +150°C - - 500 mA 100bar Non Asbestos Sheet -
RS Stock No. 780-0318
Mfr. Part No.OLS200D3LSH
BrandCynergy3
SGD73.65
Each
units
Optical Sensor Chassis Mount Transistor Polysulfone 250mm - -25°C +80°C - - 100 mA 7bar - -
RS Stock No. 185-9881
Mfr. Part No.S01DB/F21/1
SGD815.81
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. 185-9869
Mfr. Part No.S01DB/F68/4
SGD832.38
Each
units
Liquid Level Switch Side Mount SPST Aluminium Bronze - - - +210°C - - 2 A dc, 3 A ac 18bar Non Asbestos Sheet -
RS Stock No. 204-6733
Mfr. Part No.003H2
SGD466.31
Each
units
Gap Sensor Level Alarm Switch Horizontal, Vertical FET Polyphenylene Sulfide 3m - -40°C +105°C - - 100 mA 5bar - -
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. 124-0133
Mfr. Part No.LR15-0010-20
BrandFlowline
SGD3,931.05
Each
units
Pulse Radar Level Transmitter Flange Mount - Aluminium - - -60°C +150°C - 26V 20 mA 10.3bar Silicone 22.5 mA
RS Stock No. 208-7453
Mfr. Part No.B59010-D1135-B40
BrandEPCOS
SGD27.44
Each
units
Thermistor - - Stainless Steel - - -25°C +55°C - - 45 mA 10bar - -
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