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 616-2996
製造零件編號208997
HK$327.88
單位
Electro Optic Horizontal, Vertical - Polyethersulfone 150mm -40°C +125°C - - 18 mA 250psi - - -
RS庫存編號 175-5068
製造零件編號UP56-214178
BrandSick
HK$7,537.37
單位
Level Sensor PCB Mount - PBT, PVDF, TPU - -25°C +70°C - 30V 20 mA 6bar - - -
RS庫存編號 122-8434
製造零件編號232181
HK$1,527.16
單位
Electro Optic Vertical/Horizontal NC Brass 6in -40°C +110°C - 12V - 17bar - 10 mA -
RS庫存編號 756-4289
製造零件編號RSF88H100R
BrandCynergy3
HK$164.89
單位
Sensor Horizontal External NO/NC Polypropylene 1m -20°C +100°C - - 1 A - - - -
RS庫存編號 122-8433
製造零件編號232180
HK$1,527.16
單位
Electro Optic Vertical/Horizontal NC Brass 6in -40°C +110°C - 5V - 17bar - 4 mA -
RS庫存編號 892-9369
製造零件編號2130MA2MS1NNBA00001I1
BrandRosemount
HK$4,735.77
單位
Fork Level Switch Side or Top Mount - Aluminium - -40°C +180°C - - 500 mA 100bar - - -
RS庫存編號 776-1610
製造零件編號072.53
BrandFinder
HK$457.55
單位
- - - - - - - - - - - - - -
RS庫存編號 124-0135
製造零件編號LR20-0310-30
BrandFlowline
HK$21,182.49
單位
Pulse Radar Level Transmitter Flange Mount - Aluminium - -40°C +150°C - 26V 20 mA 5bar Silicone 22.5 mA -
RS庫存編號 185-9869
製造零件編號S01DB/F68/4
BrandMobrey
HK$4,317.30
單位
Liquid Level Switch Side Mount SPST Aluminium Bronze - - +210°C - - 2 A dc, 3 A ac 18bar Non Asbestos Sheet - -
RS庫存編號 177-9130
製造零件編號9038CG36LZ20
HK$2,770.19
單位
Mechanical Alternator Screw In - Painted Cold-Rolled Steel - -22°F +220°F 230 (Single Phase) V, 475 (3 Phase) V 230V - - - - -
RS庫存編號 144-9329
製造零件編號84800009
BrandXylem
HK$6,036.27
單位
10 Sensor Probe 1 m Bracket Mounted - - - - - - - - - - - -
RS庫存編號 498-7349
製造零件編號VB61.XXAGDRKMX
BrandVega
HK$6,842.67
單位
Vibrating Rod Free Relay Plastic - -50°C +150°C - - 1 A dc, 3 A ac 16bar - - -
RS庫存編號 889-1444
製造零件編號LC92-1001
BrandFlowline
HK$4,080.51
單位
Remote Level Controller DIN Rail NO/NC, SPDT Relay Polypropylene - -40°C +70°C - 13.5V 27 mA - - - -
RS庫存編號 144-2576
製造零件編號7ML5202-0FA0
BrandSiemens
HK$9,950.23
單位
Ultrasonic Clamp Mount - PBT - -40°C +60°C - 30V - - - 25 mA ATEX, IECEx
RS庫存編號 124-0124
製造零件編號LU23-01
BrandFlowline
HK$5,435.48
單位
Ultrasonic Level Transmitter Vertical - PC - -35°C +60°C - 24V 20 mA 2bar FKM - -
RS庫存編號 183-7324
製造零件編號GRF18S-N234LV
BrandSick
HK$823.90
單位
Level Sensor Threaded - Stainless Steel - -25°C +55°C - 30V - 16bar - 30 mA -
RS庫存編號 185-9853
製造零件編號S01DB/F68/1
BrandMobrey
HK$3,934.71
單位
Liquid Level Switch Side Mount SPST Aluminium Bronze - - +210°C - - 2 A dc, 5 A ac 18bar Non Asbestos Sheet - -
RS庫存編號 768-1962
製造零件編號SONS61.EEEA
BrandVega
HK$9,241.83
單位
Vibrating Rod - Relay - - - - - - 20 mA - - - ATEX
RS庫存編號 906-9594
製造零件編號F6-SS
HK$363.46
單位
Level Switch Vertical SPST Stainless Steel 11.8in -20°C +125°C 240V - - 15bar - 170 mA -
RS庫存編號 613-3522
製造零件編號SG51.XXSGATPV
BrandVega
HK$2,136.39
單位
Tuning Fork Horizontal PNP Stainless Steel - -40°C +100°C - - 250 mA 64bar - - -