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. 794-3434
Mfr. Part No.211010A1NA
BrandRosemount
$324.39
Each
units
Fork Level Switch Side or Top Mount PNP Stainless Steel - - -40°C +150°C - - 500 mA 100bar - -
RS Stock No. 892-9334
Mfr. Part No.3108HP2PG1I1
BrandRosemount
$1,729.26
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. 892-9757
Mfr. Part No.3101LP3FSCNA
BrandRosemount
$1,652.45
Each
units
Level Transmitter Top Mount 4-20mA Glass Filled Nylon - - -20°C +70°C - 30V 21.75 mA 3bar - -
RS Stock No. 892-9378
Mfr. Part No.2160XD8ES1NNBA00001I1WA3WK1M5
BrandRosemount
$3,774.12
Each
units
Fork Level Detector Side or Top Mount Relay Aluminium - - -70°C +260°C - - - 100bar Non Asbestos Carbon Fibre -
RS Stock No. 892-9754
Mfr. Part No.3105HP3FSCI1
BrandRosemount
$1,831.46
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. 794-3412
Mfr. Part No.211002R2NA
BrandRosemount
$547.10
Each
units
Fork Level Switch Side or Top Mount Direct Load Stainless Steel - - -40°C +150°C - - 500 mA 100bar - -
RS Stock No. 794-3418
Mfr. Part No.211001A1NA
BrandRosemount
$367.42
Each
units
Fork Level Switch Side or Top Mount Direct Load Stainless Steel - - -40°C +150°C - - 500 mA 100bar - -
RS Stock No. 794-3415
Mfr. Part No.211000A1NA
BrandRosemount
$367.42
Each
units
Fork Level Switch Side or Top Mount Direct Load Stainless Steel - - -40°C +150°C - - 500 mA 100bar - -
RS Stock No. 892-9344
Mfr. Part No.2120D1AH1I1AA0000
BrandRosemount
$997.17
Each
units
Fork Level Switch Side or Top Mount - Glass Filled Nylon - - -40°C +150°C - - - 100bar Non Asbestos Carbon Fibre -
RS Stock No. 892-9356
Mfr. Part No.2130LA2MS1NNBA00001NA
BrandRosemount
$1,502.07
Each
units
Fork Level Switch Side or Top Mount Direct Load Aluminium - - -40°C +180°C - - 500 mA 100bar - -
RS Stock No. 794-3437
Mfr. Part No.2120D1AV1NAAA0000
BrandRosemount
$555.39
Each
units
Fork Level Switch Side or Top Mount Relay Glass Filled Nylon - - -40°C +150°C - - 500 mA 100bar Non Asbestos Sheet -
RS Stock No. 892-9350
Mfr. Part No.2130LA2ES1NNBA00001NA
BrandRosemount
$1,931.25
Each
units
Fork Level Switch Side or Top Mount Direct Load Aluminium - - -70°C +260°C - - 500 mA 100bar - -
RS Stock No. 794-3430
Mfr. Part No.2120D1AT1E1XA0000
BrandRosemount
$994.74
Each
units
Fork Level Switch Side or Top Mount Direct Load Aluminium - - -40°C +150°C - - 500 mA 100bar Non Asbestos Sheet -
RS Stock No. 892-9369
Mfr. Part No.2130MA2MS1NNBA00001I1
BrandRosemount
$1,394.79
Each
units
Fork Level Switch Side or Top Mount - Aluminium - - -40°C +180°C - - 500 mA 100bar - -
RS Stock No. 892-9381
Mfr. Part No.5301HA2S1V5AM01000SANAW2
BrandRosemount
$3,725.74
Each
units
Guided Wave Radar Top Mount - Polyurethane-covered Aluminium 10m - -15°C +150°C - 42.4V - 40bar - -
RS Stock No. 794-3421
Mfr. Part No.2120D1AT1NAAA0000
BrandRosemount
$683.89
Each
units
Fork Level Switch Side or Top Mount Direct Load Glass Filled Nylon - - -40°C +150°C - - 500 mA 100bar Non Asbestos Sheet -
RS Stock No. 794-3428
Mfr. Part No.2120D1AK1I1AAA0000
BrandRosemount
$959.84
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. 892-9331
Mfr. Part No.3107HP2PG1I1
BrandRosemount
$1,230.99
Each
units
Level Transmitter Suspended - UVPC 20m - -40°C +60°C - 30 (Hazardous area) V, 40 (Non-Hazardous area) V 21.75 mA 3bar - -
RS Stock No. 892-9375
Mfr. Part No.2160XD8ES1NNBA00001NAWA3WK1M5
BrandRosemount
$3,825.25
Each
units
Fork Level Detector Side or Top Mount Relay Aluminium - - -70°C +260°C - - - 100bar Non Asbestos Carbon Fibre -
RS Stock No. 892-9372
Mfr. Part No.3301HA2S1V5AM01000SANAW2
BrandRosemount
$2,977.96
Each
units
Guided Wave Radar Top Mount - Polyurethane-covered Aluminium 10m - -15°C +150°C - 42V - 40bar - -