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. 906-8121
Mfr. Part No.143570
TWD2,016.00
Each
units
Level Switch Horizontal, Vertical NC Polysulfone 14in - -17.8°C +80°C - 28V 40 mA 150psi - 18 mA
RS Stock No. 907-3868
Mfr. Part No.43760
TWD8,211.00
Each
units
Level Switch Vertical SPST NC Stainless Steel 1.8m - -40°C +60°C - - - - - -
RS Stock No. 907-3883
Mfr. Part No.46999
TWD3,450.00
Each
units
Level Switch Vertical SPST NO Polysulfone 1.8m - -40°C +48.9°C 240V - - 50psi - -
RS Stock No. 907-3934
Mfr. Part No.79990
TWD5,642.00
Each
units
Level Switch Vertical SPST NO Stainless Steel 600mm - -40°C +204.4°C - - - 100psi - -
RS Stock No. 122-8428
Mfr. Part No.232175
TWD5,956.00
Each
units
Electro Optic Vertical/Horizontal NO Brass 6in - -40°C +110°C - 5V - 17bar - 4 mA
RS Stock No. 122-8432
Mfr. Part No.232179
TWD5,863.00
Each
units
Electro Optic Vertical/Horizontal NO Brass 6in - -40°C +110°C - 5V - 17bar - 4 mA
New
RS Stock No. 210-3160
Mfr. Part No.226548
TWD2,138.00
Each
units
Electro-Optic 1/4 in MNPT Direct Load Housing = Polysulfone (Contact Gems for alternative material types)Prism = PolysulfoneO-Ring = Fluorocarbon (1/4? MNPT - None)Electronics = Over-molded TPE 119.8mm - - - - - - - - -
New
RS Stock No. 210-3156
Mfr. Part No.226544
TWD2,138.00
Each
units
Electro-Optic 1/2?- 20UNF-2B* Direct Load Housing = Polysulfone (Contact Gems for alternative material types)Prism = PolysulfoneO-Ring = Fluorocarbon (1/4? MNPT - None)Electronics = Over-molded TPE 119.8mm - - - - - - - - -
New
RS Stock No. 210-3153
Mfr. Part No.226541
TWD2,138.00
Each
units
Electro-Optic 1/2?- 20UNF-2B* Direct Load Housing = Polysulfone (Contact Gems for alternative material types)Prism = PolysulfoneO-Ring = Fluorocarbon (1/4? MNPT - None)Electronics = Over-molded TPE 119.8mm - - - - - - - - -
RS Stock No. 616-2996
Mfr. Part No.208997
TWD1,663.00
Each
units
Electro Optic Horizontal, Vertical - Polyethersulfone 150mm - -40°C +125°C - - 18 mA 250psi - -
RS Stock No. 122-8419
Mfr. Part No.010-3462
TWD12,506.00
Each
units
Level Switch Side SPST NO Stainless Steel 1m - -40°C +150°C - - - 35bar - -
RS Stock No. 906-8042
Mfr. Part No.01950
TWD4,442.00
Each
units
Level Switch Vertical SPST NO Stainless Steel 24in - -40°C +149°C - - - 750psi - -
New
RS Stock No. 210-3162
Mfr. Part No.226550
TWD2,138.00
Each
units
Electro-Optic M12x1-8* Direct Load Housing = Polysulfone (Contact Gems for alternative material types)Prism = PolysulfoneO-Ring = Fluorocarbon (1/4? MNPT - None)Electronics = Over-molded TPE 119.8mm - - - - - - - - -
RS Stock No. 122-8416
Mfr. Part No.090-0024
TWD4,236.00
Each
units
Level Switch Side - Brass 1m - -40°C +100°C - - - 16bar - -
RS Stock No. 616-3006
Mfr. Part No.208998
TWD1,663.00
Each
units
Electro Optic Horizontal, Vertical - Polyethersulfone - - -40°C +125°C - - 18 mA 250psi - -
RS Stock No. 906-8147
Mfr. Part No.155660
TWD1,591.00
Each
units
Level Switch Horizontal SPST Zinc Alloy 24in - -40°C +121°C - - - 100psi - -
RS Stock No. 906-8018
Mfr. Part No.01755
TWD4,180.00
Each
units
Level Switch Vertical SPST NO Stainless Steel 24in - -40°C +148.9°C - - - 275psi - -
RS Stock No. 616-3028
Mfr. Part No.208995
TWD1,600.00
Each
units
Electro Optic Horizontal, Vertical - Polyethersulfone - - -40°C +125°C - - 18 mA 250psi - -
New
RS Stock No. 210-3161
Mfr. Part No.226549
TWD2,138.00
Each
units
Electro-Optic M12x1-8* Direct Load Housing = Polysulfone (Contact Gems for alternative material types)Prism = PolysulfoneO-Ring = Fluorocarbon (1/4? MNPT - None)Electronics = Over-molded TPE 119.8mm - - - - - - - - -
RS Stock No. 122-8433
Mfr. Part No.232180
TWD6,159.00
Each
units
Electro Optic Vertical/Horizontal NC Brass 6in - -40°C +110°C - 5V - 17bar - 4 mA