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 892-9757
製造零件編號3101LP3FSCNA
HK$7,048.20
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
HK$947.70
單位
BSP Bracket Flange Mount - - - - - - - - - - - -
RS庫存編號 204-6749
製造零件編號003S2
HK$2,613.46
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 185-9881
製造零件編號S01DB/F21/1
HK$5,199.45
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 794-3437
製造零件編號2120D1AV1NAAA0000
HK$2,700.63
單位
Fork Level Switch Side or Top Mount Relay Glass Filled Nylon - - -40°C +150°C - - 500 mA 100bar Non Asbestos Sheet -
RS庫存編號 794-3428
製造零件編號2120D1AK1I1AAA0000
HK$4,641.53
單位
Fork Level Switch Side or Top Mount NAMUR Glass Filled Nylon - - -40°C +150°C - - 2.5 mA 100bar Non Asbestos Sheet -
RS庫存編號 204-6733
製造零件編號003H2
HK$2,662.09
單位
Gap Sensor Level Alarm Switch Horizontal, Vertical FET Polyphenylene Sulfide 3m - -40°C +105°C - - 100 mA 5bar - -
RS庫存編號 511-5157
製造零件編號VLSKB131Z
HK$4,225.25
單位
Solids Level Switch Horizontal, Vertical Relay Aluminium Alloy - - -20°C +110°C - - 8 A 10bar - -
RS庫存編號 794-3418
製造零件編號211001A1NA
HK$1,370.13
單位
Fork Level Switch Side or Top Mount Direct Load Stainless Steel - - -40°C +150°C - - 500 mA 100bar - -
RS庫存編號 794-3412
製造零件編號211002R2NA
HK$2,700.63
單位
Fork Level Switch Side or Top Mount Direct Load Stainless Steel - - -40°C +150°C - - 500 mA 100bar - -
RS庫存編號 794-3421
製造零件編號2120D1AT1NAAA0000
HK$3,375.87
單位
Fork Level Switch Side or Top Mount Direct Load Glass Filled Nylon - - -40°C +150°C - - 500 mA 100bar Non Asbestos Sheet -
RS庫存編號 892-9366
製造零件編號2160XD8SS1NNBA00001NAWA3WK1M5
HK$13,105.11
單位
Fork Level Detector Side or Top Mount Relay Aluminium - - -40°C +150°C - - - 100bar Non Asbestos Carbon Fibre -
RS庫存編號 185-9853
製造零件編號S01DB/F68/1
HK$4,666.04
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 794-3424
製造零件編號2120D1AT1NAAM0150
HK$4,876.14
單位
Fork Level Switch Side or Top Mount Direct Load Glass Filled Nylon - - -40°C +150°C - - 500 mA 100bar Non Asbestos Sheet -
RS庫存編號 892-9356
製造零件編號2130LA2MS1NNBA00001NA
HK$4,377.29
單位
Fork Level Switch Side or Top Mount Direct Load Aluminium - - -40°C +180°C - - 500 mA 100bar - -
RS庫存編號 794-3434
製造零件編號211010A1NA
HK$1,333.28
單位
Fork Level Switch Side or Top Mount PNP Stainless Steel - - -40°C +150°C - - 500 mA 100bar - -
RS庫存編號 892-9369
製造零件編號2130MA2MS1NNBA00001I1
HK$4,854.27
單位
Fork Level Switch Side or Top Mount - Aluminium - - -40°C +180°C - - 500 mA 100bar - -
RS庫存編號 892-9375
製造零件編號2160XD8ES1NNBA00001NAWA3WK1M5
HK$17,858.80
單位
Fork Level Detector Side or Top Mount Relay Aluminium - - -70°C +260°C - - - 100bar Non Asbestos Carbon Fibre -
RS庫存編號 892-9381
製造零件編號5301HA2S1V5AM01000SANAW2
HK$18,391.25
單位
Guided Wave Radar Top Mount - Polyurethane-covered Aluminium 10m - -15°C +150°C - 42.4V - 40bar - -
RS庫存編號 794-3415
製造零件編號211000A1NA
HK$1,333.28
單位
Fork Level Switch Side or Top Mount Direct Load Stainless Steel - - -40°C +150°C - - 500 mA 100bar - -