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 sensors 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 Minimum Operating Temperature Maximum Operating Temperature Maximum AC Voltage Maximum DC Voltage Maximum Current Maximum Pressure Gasket Material Current Rating Hazardous Area Certification
RS Stock No. 354-290
Mfr. Part No.PS31SUS3041000MM
BrandOmron
TWD1,052.00
1 Kit
Kit(s)
Electrode Chassis Mount - Phenol Resin, Stainless Steel - - +70°C - - - - - - -
RS Stock No. 892-9754
Mfr. Part No.3105HP3FSCI1
BrandRosemount
TWD33,599.00
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 - - ATEX
RS Stock No. 124-0121
Mfr. Part No.LU20-5001-IS
BrandFlowline
TWD33,344.00
Each
units
Ultrasonic Level Transmitter Vertical - PP - -40°C +60°C - 32V 20 mA 2bar FKM - -
RS Stock No. 124-0142
Mfr. Part No.LO10-1305
BrandFlowline
TWD5,765.00
Each
units
Flowline Detection Switch Vertical NO/NC PP 3m -40°C +80°C - 36V - 10bar FKM 25 mA -
RS Stock No. 124-0126
Mfr. Part No.LU80-5101
BrandFlowline
TWD21,617.00
Each
units
Ultrasonic Level Transmitter Vertical - PC - -40°C +71°C - 28V 20 mA 2bar FKM - -
RS Stock No. 204-6733
Mfr. Part No.003H2
BrandMobrey
TWD9,990.00
Each
units
Gap Sensor Level Alarm Switch Horizontal, Vertical FET Polyphenylene Sulfide 3m -40°C +105°C - - 100 mA 5bar - - -
RS Stock No. 892-9750
Mfr. Part No.3102HP3FSCNA
BrandRosemount
TWD33,134.00
Each
units
Level Transmitter Top Mount Relay Glass Filled Nylon - -30°C +70°C - 40V 21.75 mA 3bar - - -
RS Stock No. 407-2368
Mfr. Part No.LA9RM201
TWD1,720.00
Each
units
Electrode Cable Suspension - - - - +100°C - - - - - - -
RS Stock No. 740-6442
Mfr. Part No.LMT100
TWD6,965.00
Each
units
Electronic Flush Mount PNP NO/NC FPM, PA12, PEEK, Stainless Steel - 0°C +60°C - - 50 mA 16bar PEEK - -
RS Stock No. 892-9763
Mfr. Part No.03100-1003-0002
BrandRosemount
TWD3,814.00
Each
units
BSP Bracket Flange Mount - - - - - - - - - - - -
RS Stock No. 387-0341
Mfr. Part No.CAP98XPXD
BrandVega
TWD13,019.00
Each
units
Capacitance Horizontal, Vertical Relay Polypropylene - -30°C +80°C - - 1 A dc, 3 A ac - - - -
RS Stock No. 892-9757
Mfr. Part No.3101LP3FSCNA
BrandRosemount
TWD35,632.00
Each
units
Level Transmitter Top Mount 4-20mA Glass Filled Nylon - -20°C +70°C - 30V 21.75 mA 3bar - - -
RS Stock No. 906-8121
Mfr. Part No.143570
TWD4,485.00
Each
units
Level Switch Horizontal, Vertical NC Polysulfone 14in -17.8°C +80°C - 28V 40 mA 150psi - 18 mA -
RS Stock No. 137-2044
Mfr. Part No.US01-0001-01
BrandFlowline
TWD28,425.00
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 - - -
New
RS Stock No. 193-6757
Mfr. Part No.LLC710D324-003
TWD2,115.00
Each
units
Liquid Level Switch Threaded Mount NPN Polysulfone - -40°C +125°C - 30V 7.5 mA 7bar - 7.5 mA -
RS Stock No. 124-0110
Mfr. Part No.DL10-01
BrandFlowline
TWD12,531.00
Each
units
Ultrasonic Level Transmitter Vertical - ABS, PC 1.2m -35°C +60°C - 24V 20 mA 2bar FKM - -
RS Stock No. 124-0118
Mfr. Part No.LG10-1003-01
BrandFlowline
TWD37,950.00
Each
units
Guided Radar Level Transmitter Vertical - Aluminium 5.5m -40°C +85°C - 30V 20 mA 17bar - <50 mA -
RS Stock No. 613-3386
Mfr. Part No.SG51.XXTGATPVL
BrandVega
TWD9,888.00
Each
units
Tuning Fork Horizontal PNP Stainless Steel - -40°C +150°C - - 20 mA 64bar - - -
RS Stock No. 746-7514
Mfr. Part No.1SVR450056R0100
BrandABB
TWD446.00
Each
units
Electrode Vertical - High Grade Steel, Stainless Steel - - - - - - - - - -
RS Stock No. 137-2045
Mfr. Part No.US03-0001-01
BrandFlowline
TWD34,357.00
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 - - -