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. 804-4130
Mfr. Part No.7ML1115-0CA30
BrandSiemens
MYR3,498.24
Each
units
Ultrasonic - - - - - -20°C +95°C - - - - - -
RS Stock No. 889-1346
Mfr. Part No.DL10-11
BrandFlowline
MYR1,944.05
Each
units
Ultrasonic Level Transmitter Vertical - Polycarbonate 1.2m - -35°C +60°C - 24V 20 mA 30psi Viton -
RS Stock No. 122-8419
Mfr. Part No.010-3462
MYR1,846.18
Each
units
Level Switch Side SPST NO Stainless Steel 1m - -40°C +150°C - - - 35bar - -
RS Stock No. 794-3434
Mfr. Part No.211010A1NA
BrandRosemount
MYR853.86
Each
units
Fork Level Switch Side or Top Mount PNP Stainless Steel - - -40°C +150°C - - 500 mA 100bar - -
RS Stock No. 892-9331
Mfr. Part No.3107HP2PG1I1
BrandRosemount
MYR3,485.70
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. 906-8165
Mfr. Part No.160950
MYR174.09
Each
units
Level Switch Horizontal SPST Zinc Alloy 24in - -40°C +121°C - - - 100psi - -
RS Stock No. 122-8418
Mfr. Part No.010-3464
MYR1,904.37
Each
units
Level Switch Horizontal SPDT Stainless Steel - - -40°C +150°C - - - 60bar - -
RS Stock No. 175-5059
Mfr. Part No.LFV200-XXSGAIPM
BrandSick
MYR1,171.86
Each
units
Vibrating Level Switch G1 Thread PNP PEI, Stainless Steel 1.4404 - IO-LINK -40°C +70°C - 30V 250 mA 64bar - -
RS Stock No. 906-8042
Mfr. Part No.01950
MYR481.11
Each
units
Level Switch Vertical SPST NO Stainless Steel 24in - -40°C +149°C - - - 750psi - -
RS Stock No. 137-2039
Mfr. Part No.LR11-5421-01
BrandFlowline
MYR20,278.64
Each
units
Pulse Radar Liquid Level Transmitter Vertical 2 Wire, 4 to 20 mA, HART 7 Stainless Steel 316L - - -40°C +130°C - 26.4V 20 mA 3bar Silicone 22.5 mA
RS Stock No. 793-2825
Mfr. Part No.MHF15-21NG1HSM
BrandSick
MYR549.27
Each
units
Optical Sensor Chassis Mount PNP Stainless Steel - - -25°C +55°C - - 100 mA 16bar - -
RS Stock No. 182-5613
Mfr. Part No.PS69.AXTTCAHXKMXXX
BrandVega
MYR17,626.72
Each
units
Level Sensor 1.5 BSP/G Thread 2 Wire, 4 to 20 mA PTB VALOX - - -40°C +130°C 253V 35V 22 mA 20bar - 4 → 20 mA
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