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庫存編號 613-3522
製造零件編號SG51.XXSGATPV
BrandVega
HK$2,189.99
單位
Tuning Fork Horizontal PNP Stainless Steel - - -40°C +100°C - - 250 mA 64bar - -
RS庫存編號 193-6792
製造零件編號LLG610D3L24-003-D
HK$2,013.44
單位
Liquid Level Switch Threaded Mount NPN Stainless Steel 316L - - -40°C +125°C - 30V 7.5 mA 100bar - 7.5 mA
RS庫存編號 889-1362
製造零件編號DL34-00
BrandFlowline
HK$5,744.48
單位
Ultrasonic Level Sensor Vertical 2 Wire Relay Polycarbonate 1.2m - -35°C +60°C - 24V 20 mA 30psi Viton -
RS庫存編號 907-3868
製造零件編號43760
HK$1,599.22
單位
Level Switch Vertical SPST NC Stainless Steel 1.8m - -40°C +60°C - - - - - -
RS庫存編號 616-3012
製造零件編號208996
HK$407.26
單位
Electro Optic Horizontal, Vertical - Polyethersulfone - - -40°C +125°C - - 18 mA 250psi - -
RS庫存編號 869-7621
製造零件編號ILS-G0250-005
BrandCynergy3
HK$4,058.02
單位
Pressure Cable 4-20mA Stainless Steel 5m - -20°C +60°C - 32V 28 mA 20bar - -
RS庫存編號 746-7526
製造零件編號1SVR402902R0000
BrandABB
HK$205.58
單位
Electrode - - Steel - - - - - - - - - -
RS庫存編號 889-1194
製造零件編號LU27-00
BrandFlowline
HK$5,327.15
單位
Ultrasonic Level Transmitter Vertical - Polycarbonate 3m - -35°C +60°C - 24V 20 mA 30psi Viton -
RS庫存編號 193-6777
製造零件編號LLG710D3L24-003
HK$1,086.80
單位
Liquid Level Switch Threaded Mount NPN Stainless Steel 316L - - -40°C +125°C - 30V 7.5 mA 100bar - 7.5 mA
RS庫存編號 889-1273
製造零件編號LV41-7501
BrandFlowline
HK$946.09
單位
Sump Float Level Switch Vertical - Polypropylene 15.2m - 0°C +50°C 250V - 10 A 14.5psi - -
RS庫存編號 869-7699
製造零件編號ILSE-G1000-5
BrandCynergy3
HK$1,797.68
單位
Pressure Chassis Mount 4-20mA Stainless Steel - - - - - 32V 28 mA 50bar - -
RS庫存編號 193-6739
製造零件編號LLC105100
HK$474.76
單位
Liquid Level Switch Threaded Mount Transistor Polysulfone - - -40°C +125°C - 15.4V 2.5 mA 7bar - 2.5 mA
RS庫存編號 804-4140
製造零件編號7ML1106-2BA200A
BrandSiemens
HK$5,102.93
單位
Ultrasonic - - - 10m - -20°C +65°C - - - - - -
RS庫存編號 493-6802
製造零件編號SG51.XXSGBTPV
BrandVega
HK$2,041.52
單位
Tuning Fork Horizontal PNP Stainless Steel - - -40°C +100°C - - 250 mA 64bar - -
RS庫存編號 193-6737
製造零件編號LLC102101
HK$474.76
單位
Liquid Level Switch Threaded Mount Transistor Polysulfone - - -40°C +125°C - 15.4V 2.5 mA 7bar - 2.5 mA
RS庫存編號 857-7781
製造零件編號VP02E
HK$1,402.44
單位
Optical Sensor Cable NPN Polysulfone 2m - -20°C +80°C - - 200 mA 10bar - -
RS庫存編號 892-9350
製造零件編號2130LA2ES1NNBA00001NA
BrandRosemount
HK$10,259.50
單位
Fork Level Switch Side or Top Mount Direct Load Aluminium - - -70°C +260°C - - 500 mA 100bar - -
RS庫存編號 193-6799
製造零件編號POS287413
HK$2,345.20
單位
Liquid Level Switch Threaded Mount PNP Stainless Steel 304 - - -25°C +140°C - 30V 25 mA 80bar - 25 mA
RS庫存編號 182-5619
製造零件編號PS69.ARBXXCHXA2XXX
BrandVega
HK$28,629.88
單位
Level Sensor Slip on Flange or Bracket 2 Wire, 4 to 20 mA Coated Aluminium - - -40°C +80°C 253V 35V 22 mA 2bar - 4 → 20 mA
RS庫存編號 776-1597
製造零件編號072.01.06
BrandFinder
HK$139.11
單位
Electrode Vertical Relay - 6m - 0°C +100°C - - - - - -