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. 804-4124
Mfr. Part No.7ML1100-0BA20
BrandSiemens
TWD28,823.00
Each
units
Vibrating Rod - - - - - -40 °C, -20 °C +60 °C, +73 °C - - - - - -
RS Stock No. 189-2702
Mfr. Part No.LBFS-01K21.0
BrandBaumer
TWD6,768.00
Each
units
Level Switch Bottom Mount, Side Mount, Top Mount PNP Stainless Steel 5m - -40°C +85°C - 30V 50 mA 100bar - 50 mA
RS Stock No. 889-1400
Mfr. Part No.FT10-1305
BrandFlowline
TWD7,757.00
Each
units
Liquid and Gas Flow Switch Cable - Polypropylene 3m - -40°C +60°C - 36V - 150psi Viton 1 A
New
RS Stock No. 201-0779
Mfr. Part No.VH3
TWD860.00
Each
units
Conductive Sensor Threaded - Polycarbonate 6m - - - - - - - - -
RS Stock No. 780-0321
Mfr. Part No.OLS210D324-003
BrandCynergy3
TWD3,556.00
Each
units
Optical Sensor Chassis Mount Transistor Polysulfone 250mm - -40°C +125°C - - 1 A 7bar - -
RS Stock No. 122-8417
Mfr. Part No.010-3463
TWD8,593.00
Each
units
Level Switch Horizontal SPDT Brass - - -40°C +80°C - - - 10bar - -
RS Stock No. 889-1223
Mfr. Part No.LU29-01
BrandFlowline
TWD33,118.00
Each
units
Ultrasonic Level Transmitter Vertical - Polycarbonate 3m - -35°C +60°C - 24V 20 mA 30psi Viton -
RS Stock No. 892-9334
Mfr. Part No.3108HP2PG1I1
TWD33,010.00
Each
units
Flow Transmitter Top Mount - UVPC 20m - -40°C +140°C - 30 (Hazardous area) V, 40 (Non-Hazardous area) V 20 mA 3bar - -
RS Stock No. 889-1166
Mfr. Part No.LU10-1405
BrandFlowline
TWD11,435.00
Each
units
Ultrasonic Level Switch Cable - Polypropylene 3m - -40°C +80°C - 36V - 150psi Viton 500 mA
RS Stock No. 183-7324
Mfr. Part No.GRF18S-N234LV
BrandSick
TWD3,800.00
Each
units
Optical Point Level Switch G1/2 Thread NC, NPN Stainless Steel - - -25°C +55°C - 30V - 16bar - 30 mA
RS Stock No. 137-2042
Mfr. Part No.LR21-5321-30-01
BrandFlowline
TWD148,326.00
Each
units
Pulse Radar Liquid Level Transmitter Vertical HART 7, 2 Wire, 4 to 20 mA Stainless Steel 316L - - -40°C +150°C - 26.4V 20 mA 5bar Silicone 22.5 mA
RS Stock No. 616-2996
Mfr. Part No.208997
TWD1,600.00
Each
units
Electro Optic Horizontal, Vertical - Polyethersulfone 150mm - -40°C +125°C - - 18 mA 250psi - -
RS Stock No. 144-9333
Mfr. Part No.84800025
BrandXylem
TWD27,406.00
Each
units
10 Sensor Probe 3 m Bracket Mounted - - - - - - - - - - - -
RS Stock No. 137-2048
Mfr. Part No.UG01-0001-41
BrandFlowline
TWD28,087.00
Each
units
Reflective Ultrasonic Multi-Function Liquid Level Transmitter Vertical 2 Wire, 4 to 20 mA Polypropylene 1.2m - -40°C +80°C - 28V 20 mA 2bar - -
RS Stock No. 377-9816
Mfr. Part No.VC5510PNOP
TWD3,844.00
Each
units
Capacitance Switch Chassis Mount PNP ABS/Polycarbonate 1.5m - 0°C +50°C - 30V 100 mA - - -
RS Stock No. 193-6790
Mfr. Part No.LLG210D3L24-003-D
TWD7,914.00
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. 124-0133
Mfr. Part No.LR15-0010-20
BrandFlowline
TWD69,849.00
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. 794-3428
Mfr. Part No.2120D1AK1I1AAA0000
TWD17,802.00
Each
units
Fork Level Switch Side or Top Mount NAMUR Glass Filled Nylon - - -40°C +150°C - - 2.5 mA 100bar Non Asbestos Sheet -
RS Stock No. 182-8937
Mfr. Part No.44S0003
BrandUnipower
TWD161.70
Each (In a Pack of 3)
units
Electrode - - Stainless Steel - - -10°C +65°C - - - - - -
RS Stock No. 137-2045
Mfr. Part No.US03-0001-01
BrandFlowline
TWD29,104.00
Each
units
Reflective Ultrasonic Liquid Level Transmitter Horizontal, Vertical 2 Wire, 4 to 20 mA Polypropylene 1.2m - -40°C +80°C - 28V 20 mA 2bar - -