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. 804-3850
Mfr. Part No.7ML5501-0EA70
BrandSiemens
MYR1,806.41
Each
units
Capacitance Switch Vertical Relay Stainless Steel - - -30°C +100°C - - - 10bar - -
RS Stock No. 768-2069
Mfr. Part No.SWINGS52.EEA7CV
BrandVega
MYR1,861.58
Each
units
Level Switch Chassis Mount PNP - - - - +150°C - - - - - -
RS Stock No. 906-8018
Mfr. Part No.01755
MYR467.75
Each
units
Level Switch Vertical SPST NO Stainless Steel 24in - -40°C +148.9°C - - - 275psi - -
RS Stock No. 361-1732
Mfr. Part No.LP01
MYR73.91
Each
units
Electrode Free - Stainless Steel, Vinyl - - - +70°C - - - - - -
RS Stock No. 392-7841
Mfr. Part No.3UG3207-3A
BrandSiemens
MYR500.34
Each
units
Electrode Horizontal - - 2m - - +90°C - - - 10bar PTFE -
RS Stock No. 780-0387
Mfr. Part No.CW1
BrandCynergy3
MYR14.09
Each
units
Weight - - Polypropylene - - -20°C - - - - 100bar - -
RS Stock No. 387-0341
Mfr. Part No.CAP98XPXD
BrandVega
MYR2,103.75
Each
units
Capacitance Horizontal, Vertical Relay Polypropylene - - -30°C +80°C - - 1 A dc, 3 A ac - - -
RS Stock No. 387-0379
Mfr. Part No.KON66.XG3VPR
BrandVega
MYR2,347.87
Each
units
Conductive Vertical Relay Plastic - - -40°C +100°C - - 1 A dc, 3 A ac 6bar - -
RS Stock No. 889-1390
Mfr. Part No.DX10-10
BrandFlowline
MYR1,906.64
Each
units
Ultrasonic Level Sensor Vertical - Polycarbonate 1.2m - -35°C +60°C - 24V 15 (Nominal) mA 30psi Viton -
RS Stock No. 889-1194
Mfr. Part No.LU27-00
BrandFlowline
MYR3,138.70
Each
units
Ultrasonic Level Transmitter Vertical - Polycarbonate 3m - -35°C +60°C - 24V 20 mA 30psi Viton -
RS Stock No. 493-7186
Mfr. Part No.7ML5221-1BB11
BrandSiemens
MYR5,237.24
Each
units
Ultrasonic - - PBT - - -40°C +85°C - - 20 mA - - -
RS Stock No. 122-8417
Mfr. Part No.010-3463
MYR1,314.05
Each
units
Level Switch Horizontal SPDT Brass - - -40°C +80°C - - - 10bar - -
RS Stock No. 616-2996
Mfr. Part No.208997
MYR239.95
Each
units
Electro Optic Horizontal, Vertical - Polyethersulfone 150mm - -40°C +125°C - - 18 mA 250psi - -
RS Stock No. 889-1352
Mfr. Part No.DL14-10
BrandFlowline
MYR2,376.10
Each
units
Multi Function Ultrasonic Transmitter Vertical Relay Polycarbonate 1.2m - -35°C +60°C - 24V 20 mA 30psi Viton -
RS Stock No. 124-0132
Mfr. Part No.LR10-0010
BrandFlowline
MYR8,859.57
Each
units
Pulse Radar Level Transmitter Vertical - Aluminium - - -40°C +130°C - 26V 20 mA 3bar Silicone 22.5 mA
RS Stock No. 892-9350
Mfr. Part No.2130LA2ES1NNBA00001NA
BrandRosemount
MYR6,073.31
Each
units
Fork Level Switch Side or Top Mount Direct Load Aluminium - - -70°C +260°C - - 500 mA 100bar - -
RS Stock No. 889-1431
Mfr. Part No.LC42-1001
BrandFlowline
MYR1,317.80
Each
units
Remote Level Controller DIN Rail NO/NC, SPDT Relay Polypropylene - - -40°C +70°C - 13.5V 27 mA - - -
RS Stock No. 794-3415
Mfr. Part No.211000A1NA
BrandRosemount
MYR853.86
Each
units
Fork Level Switch Side or Top Mount Direct Load Stainless Steel - - -40°C +150°C - - 500 mA 100bar - -
RS Stock No. 756-4255
Mfr. Part No.RSF48H100RF
BrandCynergy3
MYR114.93
Each
units
Reed Horizontal Internal NO/NC Polypropylene 1m - -20°C +100°C - - 1 A - Nitrile -
RS Stock No. 493-6846
Mfr. Part No.FX-S.61C 2M
BrandVega
MYR998.04
Each
units
Radar - - PBT - - - - - - 20 mA 4bar - -