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. 776-1617
Mfr. Part No.072.51
BrandFinder
HK$351.34
Each
units
Electrolode holder - - - - - - - - - - - - -
RS Stock No. 185-9847
Mfr. Part No.SMA1
BrandMobrey
HK$3,224.00
Each
units
Level Alarm Switch Side Mount SPDT Stainless Steel - 0°C +130°C - - 15 A ac, 250 mA dc 19bar Non Asbestos Carbon Fibre - -
RS Stock No. 892-9757
Mfr. Part No.3101LP3FSCNA
BrandRosemount
HK$6,878.44
Each
units
Level Transmitter Top Mount 4-20mA Glass Filled Nylon - -20°C +70°C - 30V 21.75 mA 3bar - - -
RS Stock No. 354-290
Mfr. Part No.PS31SUS3041000MM
BrandOmron
HK$267.39
1 Kit
Kit(s)
Electrode Chassis Mount - Phenol Resin, Stainless Steel - - +70°C - - - - - - -
RS Stock No. 892-9754
Mfr. Part No.3105HP3FSCI1
BrandRosemount
HK$8,724.89
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. 892-9763
Mfr. Part No.03100-1003-0002
BrandRosemount
HK$822.26
Each
units
BSP Bracket Flange Mount - - - - - - - - - - - -
RS Stock No. 407-2368
Mfr. Part No.LA9RM201
HK$378.00
Each
units
Electrode Cable Suspension - - - - +100°C - - - - - - -
RS Stock No. 493-7186
Mfr. Part No.7ML5221-1BB11
BrandSiemens
HK$8,069.00
Each
units
Ultrasonic - - PBT - -40°C +85°C - - 20 mA - - - -
RS Stock No. 204-6749
Mfr. Part No.003S2
BrandMobrey
HK$2,076.04
Each
units
Gap Sensor Level Alarm Switch Horizontal, Vertical Relay Polyphenylene Sulfide 3m -20°C +70°C - - 1 A 5bar - - -
RS Stock No. 354-335
Mfr. Part No.F0301SUS201ELECTRODE
BrandOmron
HK$174.09
Each
units
Electrode Chassis Mount - Stainless Steel - - +70°C - - - - - - -
RS Stock No. 361-1732
Mfr. Part No.LP01
HK$97.20
Each
units
Electrode Free - Stainless Steel, Vinyl - - +70°C - - - - - - -
RS Stock No. 889-1393
Mfr. Part No.DX10-00-8FT
BrandFlowline
HK$2,526.03
Each
units
Ultrasonic Level Sensor Vertical - Polycarbonate 1.2m -35°C +60°C - 24V 15 (Nominal) mA 30psi Viton - -
RS Stock No. 746-7514
Mfr. Part No.1SVR450056R0100
BrandABB
HK$90.46
Each
units
Electrode Vertical - High Grade Steel, Stainless Steel - - - - - - - - - -
RS Stock No. 869-7680
Mfr. Part No.ILSE-G0100-5
BrandCynergy3
HK$1,751.47
Each
units
Pressure Chassis Mount 4-20mA Stainless Steel - - - - 32V 28 mA 20bar - - -
RS Stock No. 493-7192
Mfr. Part No.7ML5221-1DB11
BrandSiemens
HK$9,652.99
Each
units
Ultrasonic - - PBT - -40°C +85°C - - 20 mA - - - -
RS Stock No. 889-1340
Mfr. Part No.DL14-00
BrandFlowline
HK$3,400.42
Each
units
Multi Function Ultrasonic Transmitter Vertical Relay Polycarbonate 1.2m -35°C +60°C - 24V 20 mA 30psi Viton - -
RS Stock No. 889-1374
Mfr. Part No.DS14-00
BrandFlowline
HK$3,206.12
Each
units
Controller, Ultrasonic Level Switch Vertical - Polycarbonate 1.2m -35°C +60°C 24V 24V - 30psi Viton 1 A -
RS Stock No. 377-9816
Mfr. Part No.VC5510PNOP
HK$428.40
Each
units
Capacitance Switch Chassis Mount PNP ABS/Polycarbonate 1.5m 0°C +50°C - 30V 100 mA - - - -
RS Stock No. 892-9750
Mfr. Part No.3102HP3FSCNA
BrandRosemount
HK$8,194.08
Each
units
Level Transmitter Top Mount Relay Glass Filled Nylon - -30°C +70°C - 40V 21.75 mA 3bar - - -
RS Stock No. 493-6852
Mfr. Part No.PS61.XXAGPHKMXX
BrandVega
HK$17,598.06
Each
units
Radar Vertical - Plastic - -40°C +80°C - - 20 mA 2bar - - -
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