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. 511-5157
Mfr. Part No.VLSKB131Z
TWD16,380.00
Each
units
Solids Level Switch Horizontal, Vertical Relay Aluminium Alloy - - -20°C +110°C - - 8 A 10bar - -
RS Stock No. 907-3934
Mfr. Part No.79990
TWD5,476.00
Each
units
Level Switch Vertical SPST NO Stainless Steel 600mm - -40°C +204.4°C - - - 100psi - -
RS Stock No. 857-3212
Mfr. Part No.VPC310
TWD7,289.00
Each
units
Conductive Chassis Mount Relay PVC 2m - 0°C +60°C - - - 2bar - -
New
RS Stock No. 205-1301
Mfr. Part No.14241092
BrandWIKA
TWD11,929.00
Each
units
Optoelectronic Panel Mount PNP Stainless Steel - - - - - - - - - -
RS Stock No. 780-0330
Mfr. Part No.OLS210D3L24-003
BrandCynergy3
TWD3,200.00
Each
units
Optical Sensor Chassis Mount Transistor Polysulfone 250mm - -40°C +125°C - - 1 A 7bar - -
RS Stock No. 892-9344
Mfr. Part No.2120D1AH1I1AA0000
TWD15,857.00
Each
units
Fork Level Switch Side or Top Mount - Glass Filled Nylon - - -40°C +150°C - - - 100bar Non Asbestos Carbon Fibre -
RS Stock No. 892-9375
Mfr. Part No.2160XD8ES1NNBA00001NAWA3WK1M5
TWD68,111.00
Each
units
Fork Level Detector Side or Top Mount Relay Aluminium - - -70°C +260°C - - - 100bar Non Asbestos Carbon Fibre -
RS Stock No. 189-2700
Mfr. Part No.LBFS-01L21.0
BrandBaumer
TWD8,917.00
Each
units
Level Switch Bottom Mount, Side Mount, Top Mount PNP Stainless Steel 5m - -40°C +85°C - 30V 50 mA 5bar - 50 mA
RS Stock No. 780-0179
Mfr. Part No.SSF22X100-M12X1
BrandCynergy3
TWD2,739.00
Each
units
Level Switch Vertical - Stainless Steel 1m - -20°C +120°C - - 500 mA 10bar - -
New
RS Stock No. 205-1298
Mfr. Part No.46928160
BrandWIKA
TWD9,667.00
Each
units
Optoelectronic Panel Mount PNP Stainless Steel - - - - - - - - - -
RS Stock No. 124-0124
Mfr. Part No.LU23-01
BrandFlowline
TWD21,849.00
Each
units
Ultrasonic Level Transmitter Vertical - PC - - -35°C +60°C - 24V 20 mA 2bar FKM -
RS Stock No. 804-4140
Mfr. Part No.7ML1106-2BA200A
BrandSiemens
TWD32,967.00
Each
units
Ultrasonic - - - 10m - -20°C +65°C - - - - - -
RS Stock No. 193-6772
Mfr. Part No.LLG210D324-003
TWD4,272.00
Each
units
Liquid Level Switch Threaded Mount NPN Stainless Steel 316L - - -40°C +125°C - 30V 7.5 mA 100bar - 7.5 mA
RS Stock No. 889-1211
Mfr. Part No.LU28-41
BrandFlowline
TWD31,235.00
Each
units
Ultrasonic Level Transmitter Vertical - Polycarbonate 4.6m - -35°C +60°C - 24V 20 mA 30psi Viton -
RS Stock No. 183-7325
Mfr. Part No.GRF18S-E234LV
BrandSick
TWD3,800.00
Each
units
Optical Point Level Switch G1/2 Thread NO, NPN Stainless Steel - - -25°C +55°C - 30V - 16bar - ≤30 mA
RS Stock No. 175-5065
Mfr. Part No.PFT-FRBX25SF1OSSAMSSZ
BrandSick
TWD16,800.00
Each
units
Hydrostatic Level Sensor G1 Thread 2 Wire, 4 to 20 mA Stainless Steel 1.4571 - - -20°C +80°C - 30V 20 mA 0.25bar - -
RS Stock No. 498-7349
Mfr. Part No.VB61.XXAGDRKMX
BrandVega
TWD27,496.00
Each
units
Vibrating Rod Free Relay Plastic - - -50°C +150°C - - 1 A dc, 3 A ac 16bar - -
RS Stock No. 804-4124
Mfr. Part No.7ML1100-0BA20
BrandSiemens
TWD28,823.00
Each
units
Vibrating Rod - - - - - -40 °C, -20°C +60 °C, +73°C - - - - - -
RS Stock No. 468-3457
Mfr. Part No.SN62XXAGVDMA
BrandVega
TWD59,193.00
Each
units
Ultrasonic - - Aluminium - - -40°C +80°C - - 20 mA 2bar - -
RS Stock No. 124-0116
Mfr. Part No.LM50-1001-1
BrandFlowline
TWD1,446.00
Each
units
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