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. 804-4137
Mfr. Part No.7ML1115-3CA30
BrandSiemens
HK$5,501.07
Each
units
Ultrasonic - - - - -20°C +95°C - - - - - - -
RS Stock No. 488-037
Mfr. Part No.LR7000
HK$2,561.87
Each
units
- - PNP Stainless Steel/FKM/NBR/PB/PC/PEI/TPE/PTFE - 0°C +60°C - - 200 mA 4bar - - -
RS Stock No. 124-0121
Mfr. Part No.LU20-5001-IS
BrandFlowline
HK$7,593.72
Each
units
Ultrasonic Level Transmitter Vertical - PP - -40°C +60°C - 32V 20 mA 2bar FKM - -
RS Stock No. 144-9331
Mfr. Part No.84800017
BrandXylem
HK$6,510.64
Each
units
10 Sensor Probe 2 m Bracket Mounted - - - - - - - - - - - -
RS Stock No. 177-9130
Mfr. Part No.9038CG36LZ20
HK$2,770.19
Each
units
Mechanical Alternator Screw In - Painted Cold-Rolled Steel - -22°F +220°F 230 (Single Phase) V, 475 (3 Phase) V 230V - - - - -
RS Stock No. 124-0135
Mfr. Part No.LR20-0310-30
BrandFlowline
HK$21,182.49
Each
units
Pulse Radar Level Transmitter Flange Mount - Aluminium - -40°C +150°C - 26V 20 mA 5bar Silicone 22.5 mA -
RS Stock No. 858-2686
Mfr. Part No.CLP2EA1C230
HK$1,803.06
Each
units
Conductive Plug DPDT Relay NORYL PPO 100m -20°C +50°C - - 8 A - - - -
New
RS Stock No. 189-2704
Mfr. Part No.LBFH-21.010.A03020.1.0003.0
BrandBaumer
HK$1,427.97
Each
units
Level Switch Bottom Mount, Side Mount, Top Mount PNP Stainless Steel - -40°C +85°C - 36V 40 mA 10bar - 40 mA ATEX
RS Stock No. 468-3435
Mfr. Part No.SN62XXAGHKMX
BrandVega
HK$11,299.20
Each
units
Ultrasonic - - Plastic - -40°C +80°C - - 20 mA 2bar - - -
RS Stock No. 793-2825
Mfr. Part No.MHF15-21NG1HSM
BrandSick
HK$953.38
Each
units
Optical Sensor Chassis Mount PNP Stainless Steel - -25°C +55°C - - 100 mA 16bar - - -
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. 468-3479
Mfr. Part No.SN61XXAGHKMA
BrandVega
HK$10,551.20
Each
units
Ultrasonic - - Plastic - -40°C +80°C - - 20 mA 2bar - - -
RS Stock No. 144-9329
Mfr. Part No.84800009
BrandXylem
HK$6,036.27
Each
units
10 Sensor Probe 1 m Bracket Mounted - - - - - - - - - - - -
RS Stock No. 869-7716
Mfr. Part No.ILTS-G0500-007
BrandCynergy3
HK$5,929.00
Each
units
Pressure Cable - Stainless Steel 7m -20°C +60°C - 32V 28 mA 50bar - - -
RS Stock No. 869-7699
Mfr. Part No.ILSE-G1000-5
BrandCynergy3
HK$1,751.47
Each
units
Pressure Chassis Mount 4-20mA Stainless Steel - - - - 32V 28 mA 50bar - - -
RS Stock No. 869-7725
Mfr. Part No.ILTS-G1000-015
BrandCynergy3
HK$4,887.73
Each
units
Pressure Cable - Stainless Steel 15m -20°C +60°C - 32V 28 mA 50bar - - -
RS Stock No. 889-1217
Mfr. Part No.LU28-40
BrandFlowline
HK$7,335.20
Each
units
Ultrasonic Level Transmitter Vertical - Polycarbonate 4.6m -35°C +60°C - 24V 20 mA 30psi Viton - -
RS Stock No. 616-3012
Mfr. Part No.208996
HK$384.03
Each
units
Electro Optic Horizontal, Vertical - Polyethersulfone - -40°C +125°C - - 18 mA 250psi - - -
RS Stock No. 889-1286
Mfr. Part No.LV42-7501
BrandFlowline
HK$1,797.37
Each
units
Sump Float Level Switch Vertical - Polypropylene 15.2m -20°C +80°C 250V - 10 A 29psi - - -
RS Stock No. 776-1623
Mfr. Part No.072.501
BrandFinder
HK$42.77
Each
units
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