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. 901-0299
Mfr. Part No.PS61.XXBXXHKMXX
BrandVega
£1,598.46
Each
Units
Radar Sensor Panel Mount HART Polypropylene - - -40°C +80°C 253V 48V 20 mA 3bar FPM 4 → 20 mA
RS Stock No. 387-0341
Mfr. Part No.CAP98XPXD
BrandVega
£315.39
Each
Units
Capacitance Horizontal, Vertical Relay Polypropylene - - -30°C +80°C - - 1 A dc, 3 A ac - - -
RS Stock No. 768-2038
Mfr. Part No.VIBS61.EEJ2RC
BrandVega
£546.00
Each
Units
Sensor Cable Relay Stainless Steel - - -40°C +150°C - - 1 A dc, 3 A ac 1.1bar - -
RS Stock No. 892-9754
Mfr. Part No.3105HP3FSCI1
BrandRosemount
£777.47
Each
Units
Level Transmitter Top Mount Relay Glass Filled Nylon - - -30°C +70°C - 30 (Hazardous area) V, 40 (Non-Hazardous area) V 21.75 mA 3bar - -
RS Stock No. 419-4654
Mfr. Part No.SWING61XXGBVXPRX
BrandVega
£398.27
Each
Units
Vibrating Rod Horizontal, Vertical Relay Plastic - - -50°C +150°C - - 1 A dc, 3 A ac 64bar - -
RS Stock No. 857-3590
Mfr. Part No.VNI4
£273.70
Each
Units
Conductive Cable Relay Nylon 6 2m - 0°C +90°C - - - 10bar - -
RS Stock No. 488-021
Mfr. Part No.LK1023
£326.87
Each
Units
- - PNP Stainless Steel/FKM/NBR/PBT/PC/PEI/PP/TPE - - 0°C +60°C - - 200 mA 0.5bar - -
RS Stock No. 124-0110
Mfr. Part No.DL10-01
BrandFlowline
£291.90
Each
Units
Ultrasonic Level Transmitter Vertical - ABS, PC 1.2m - -35°C +60°C - 24V 20 mA 2bar FKM -
RS Stock No. 780-0305
Mfr. Part No.OLS500D3L
BrandCynergy3
£29.86
Each
Units
Optical Sensor Chassis Mount Transistor Polysulfone 250mm - -25°C +80°C - - 100 mA 20bar - -
RS Stock No. 776-1597
Mfr. Part No.072.01.06
BrandFinder
£13.94
Each
Units
Electrode Vertical Relay - 6m - 0°C +100°C - - - - - -
RS Stock No. 124-0137
Mfr. Part No.LU10-1305
BrandFlowline
£272.56
Each
Units
Ultrasonic Level Switch Vertical - PP 3m - -40°C +80°C - 36V - 10bar FKM 25 mA
RS Stock No. 768-2034
Mfr. Part No.VIBS61.EEJ2RA
BrandVega
£481.18
Each
Units
Sensor Cable Relay - - - -40°C +150°C - - 1 A dc, 3 A ac 1.1bar - -
RS Stock No. 780-0175
Mfr. Part No.SSF22X100-18N
BrandCynergy3
£62.38
Each
Units
Level Switch Vertical - Stainless Steel 1m - -20°C +120°C - - 500 mA 10bar - -
RS Stock No. 776-1601
Mfr. Part No.072.02.06
BrandFinder
£13.27
Each
Units
Electrode Vertical Relay Stainless Steel 6m - 0°C +100°C - - - - - -
RS Stock No. 488-037
Mfr. Part No.LR7000
£289.49
Each
Units
- - PNP Stainless Steel/FKM/NBR/PB/PC/PEI/TPE/PTFE - - 0°C +60°C - - 200 mA 4bar - -
RS Stock No. 901-0292
Mfr. Part No.FX82.IXXTBFHXKMXX
BrandVega
£1,284.15
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. 780-0302
Mfr. Part No.OLS500D3
BrandCynergy3
£29.86
Each
Units
Optical Sensor Chassis Mount Transistor Polysulfone 250mm - -25°C +80°C - - 100 mA 20bar - -
RS Stock No. 493-6846
Mfr. Part No.FX-S.61C 2M
BrandVega
£149.62
Each
Units
Radar - - PBT - - - - - - 20 mA 4bar - -
RS Stock No. 804-3976
Mfr. Part No.7ML5731-7AA11-1DA0
BrandSiemens
£517.55
Each
Units
Vibrating Level Switch Vertical PNP Stainless Steel - - -40°C +150°C - - 5 A 10bar - -
RS Stock No. 776-1604
Mfr. Part No.072.11
BrandFinder
£15.45
Each
Units
Sensor Surface Mount Relay Stainless Steel 200m - 0°C +100°C - - 30 A - - -
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