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庫存編號 776-1617
製造零件編號072.51
BrandFinder
HK$351.34
單位
Electrolode holder - - - - - - - - - - - - -
RS庫存編號 185-9847
製造零件編號SMA1
BrandMobrey
HK$3,224.00
單位
Level Alarm Switch Side Mount SPDT Stainless Steel - 0°C +130°C - - 15 A ac, 250 mA dc 19bar Non Asbestos Carbon Fibre - -
RS庫存編號 354-290
製造零件編號PS31SUS3041000MM
BrandOmron
HK$267.39
整套:1 個
Kit(s)
Electrode Chassis Mount - Phenol Resin, Stainless Steel - - +70°C - - - - - - -
RS庫存編號 892-9757
製造零件編號3101LP3FSCNA
BrandRosemount
HK$6,878.44
單位
Level Transmitter Top Mount 4-20mA Glass Filled Nylon - -20°C +70°C - 30V 21.75 mA 3bar - - -
RS庫存編號 892-9763
製造零件編號03100-1003-0002
BrandRosemount
HK$822.26
單位
BSP Bracket Flange Mount - - - - - - - - - - - -
RS庫存編號 892-9754
製造零件編號3105HP3FSCI1
BrandRosemount
HK$8,724.89
單位
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庫存編號 407-2368
製造零件編號LA9RM201
HK$378.00
單位
Electrode Cable Suspension - - - - +100°C - - - - - - -
RS庫存編號 493-7186
製造零件編號7ML5221-1BB11
BrandSiemens
HK$8,069.00
單位
Ultrasonic - - PBT - -40°C +85°C - - 20 mA - - - -
RS庫存編號 204-6749
製造零件編號003S2
BrandMobrey
HK$2,076.04
單位
Gap Sensor Level Alarm Switch Horizontal, Vertical Relay Polyphenylene Sulfide 3m -20°C +70°C - - 1 A 5bar - - -
RS庫存編號 354-335
製造零件編號F0301SUS201ELECTRODE
BrandOmron
HK$174.09
單位
Electrode Chassis Mount - Stainless Steel - - +70°C - - - - - - -
RS庫存編號 889-1374
製造零件編號DS14-00
BrandFlowline
HK$3,206.12
單位
Controller, Ultrasonic Level Switch Vertical - Polycarbonate 1.2m -35°C +60°C 24V 24V - 30psi Viton 1 A -
RS庫存編號 869-7680
製造零件編號ILSE-G0100-5
BrandCynergy3
HK$1,751.47
單位
Pressure Chassis Mount 4-20mA Stainless Steel - - - - 32V 28 mA 20bar - - -
RS庫存編號 746-7514
製造零件編號1SVR450056R0100
BrandABB
HK$90.46
單位
Electrode Vertical - High Grade Steel, Stainless Steel - - - - - - - - - -
RS庫存編號 361-1732
製造零件編號LP01
HK$97.20
單位
Electrode Free - Stainless Steel, Vinyl - - +70°C - - - - - - -
RS庫存編號 493-7192
製造零件編號7ML5221-1DB11
BrandSiemens
HK$9,652.99
單位
Ultrasonic - - PBT - -40°C +85°C - - 20 mA - - - -
RS庫存編號 889-1393
製造零件編號DX10-00-8FT
BrandFlowline
HK$2,526.03
單位
Ultrasonic Level Sensor Vertical - Polycarbonate 1.2m -35°C +60°C - 24V 15 (Nominal) mA 30psi Viton - -
RS庫存編號 493-6852
製造零件編號PS61.XXAGPHKMXX
BrandVega
HK$17,598.06
單位
Radar Vertical - Plastic - -40°C +80°C - - 20 mA 2bar - - -
RS庫存編號 185-9881
製造零件編號S01DB/F21/1
BrandMobrey
HK$5,076.68
單位
Liquid Level Switch Top Mount SPST Aluminium Bronze - - +210°C - - 2 A dc, 5 A ac 18bar Non Asbestos Sheet - -
RS庫存編號 377-9816
製造零件編號VC5510PNOP
HK$428.40
單位
Capacitance Switch Chassis Mount PNP ABS/Polycarbonate 1.5m 0°C +50°C - 30V 100 mA - - - -
RS庫存編號 892-9750
製造零件編號3102HP3FSCNA
BrandRosemount
HK$8,194.08
單位
Level Transmitter Top Mount Relay Glass Filled Nylon - -30°C +70°C - 40V 21.75 mA 3bar - - -