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 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. 869-7696
Mfr. Part No.ILSE-G0700-5
BrandCynergy3
HK$1,751.47
Each
units
Pressure Chassis Mount 4-20mA Stainless Steel - - - - 32V 28 mA 50bar - - -
RS Stock No. 122-8431
Mfr. Part No.232178
HK$1,527.16
Each
units
Electro Optic Vertical/Horizontal NC Brass 6in -40°C +110°C - 12V - 17bar - 10 mA -
RS Stock No. 124-0116
Mfr. Part No.LM50-1001-1
BrandFlowline
HK$338.45
Each
units
- - - - - - - - - - - - - -
RS Stock No. 513-2449
Mfr. Part No.7ML5430-2BE10
BrandSiemens
HK$12,035.25
Each
units
Radar - - PBT - -40°C +80°C - - 20 mA 3bar - - ATEX
RS Stock No. 889-1166
Mfr. Part No.LU10-1405
BrandFlowline
HK$2,768.92
Each
units
Ultrasonic Level Switch Cable - Polypropylene 3m -40°C +80°C - 36V - 150psi Viton 500 mA -
RS Stock No. 906-9594
Mfr. Part No.F6-SS
HK$363.46
Each
units
Level Switch Vertical SPST Stainless Steel 11.8in -20°C +125°C 240V - - 15bar - 170 mA -
RS Stock No. 756-4289
Mfr. Part No.RSF88H100R
BrandCynergy3
HK$164.89
Each
units
Sensor Horizontal External NO/NC Polypropylene 1m -20°C +100°C - - 1 A - - - -
RS Stock No. 183-7323
Mfr. Part No.GRF18S-F234LV
BrandSick
HK$823.90
Each
units
Level Sensor Threaded - Stainless Steel - -25°C +55°C - 30V - 16bar - 30 mA -
New
RS Stock No. 189-2702
Mfr. Part No.LBFS-01K21.0
BrandBaumer
HK$1,794.72
Each
units
Level Switch Bottom Mount, Side Mount, Top Mount PNP Stainless Steel 5m -40°C +85°C - 30V 50 mA 100bar - 50 mA ATEX
RS Stock No. 889-1390
Mfr. Part No.DX10-10
BrandFlowline
HK$2,768.92
Each
units
Ultrasonic Level Sensor Vertical - Polycarbonate 1.2m -35°C +60°C - 24V 15 (Nominal) mA 30psi Viton - -
RS Stock No. 869-7652
Mfr. Part No.ILLS-G0250-5-005
BrandCynergy3
HK$2,146.26
Each
units
Pressure Cable 4-20mA Stainless Steel 5m -20°C +60°C - 32V 28 mA 20bar - - -
RS Stock No. 892-9350
Mfr. Part No.2130LA2ES1NNBA00001NA
BrandRosemount
HK$10,259.50
Each
units
Fork Level Switch Side or Top Mount Direct Load Aluminium - -70°C +260°C - - 500 mA 100bar - - -
RS Stock No. 804-4112
Mfr. Part No.7ML1201-1FE00
BrandSiemens
HK$9,250.08
Each
units
Ultrasonic Vertical Relay - - -40°C +60°C - - - - - - -
RS Stock No. 144-2576
Mfr. Part No.7ML5202-0FA0
BrandSiemens
HK$9,950.23
Each
units
Ultrasonic Clamp Mount - PBT - -40°C +60°C - 30V - - - 25 mA ATEX, IECEx
RS Stock No. 144-2575
Mfr. Part No.7ML5201-0FA0
BrandSiemens
HK$7,459.26
Each
units
Ultrasonic Clamp Mount - PBT - -30°C +60°C - 30V - - - 25 mA -
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