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 468-3463
製造零件編號SN61XXAGHKMX
BrandVega
HK$9,728.40
單位
Ultrasonic - - Plastic - -40°C +80°C - - 20 mA 2bar - - -
RS庫存編號 137-2052
製造零件編號LG10-1003-00-072
BrandFlowline
HK$9,656.00
單位
Guided Wave Liquid Level Transmitter Vertical 3 Wire, 4 to 20 mA Aluminium (Enclosure), Galvanised (Coaxial), Stainless Steel 316L (Coaxial) 5.5m -40°C +150°C - 30V 20 mA 17bar - 50 mA -
RS庫存編號 804-4159
製造零件編號7ML1106-1BA200A
BrandSiemens
HK$5,147.39
單位
Ultrasonic - - - - -20°C +65°C - - - - - - -
RS庫存編號 768-2019
製造零件編號WAVES61.EEJ2RC
BrandVega
HK$5,358.57
單位
Vibrating Level Switch Cable Relay - - -40°C +150°C - - 1 A dc, 3 A ac 1.1bar - - ATEX
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 804-3967
製造零件編號7ML5735-2AA11-0AA0
BrandSiemens
HK$3,178.26
單位
Vibrating Level Switch Vertical Relay - - -40°C +150°C - - 8 A 10bar - - -
RS庫存編號 122-8431
製造零件編號232178
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 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 468-3435
製造零件編號SN62XXAGHKMX
BrandVega
HK$11,299.20
單位
Ultrasonic - - Plastic - -40°C +80°C - - 20 mA 2bar - - -
RS庫存編號 183-7323
製造零件編號GRF18S-F234LV
BrandSick
HK$823.90
單位
Level Sensor Threaded - Stainless Steel - -25°C +55°C - 30V - 16bar - 30 mA -
RS庫存編號 889-1390
製造零件編號DX10-10
BrandFlowline
HK$2,768.92
單位
Ultrasonic Level Sensor Vertical - Polycarbonate 1.2m -35°C +60°C - 24V 15 (Nominal) mA 30psi Viton - -
RS庫存編號 124-0116
製造零件編號LM50-1001-1
BrandFlowline
HK$338.45
單位
- - - - - - - - - - - - - -
RS庫存編號 804-3963
製造零件編號7ML5746-1BA00-1AA0
BrandSiemens
HK$6,146.77
單位
Vibrating Level Switch Vertical Relay Stainless Steel - -50°C +250°C - - 400 mA 64bar - - -
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 144-2575
製造零件編號7ML5201-0FA0
BrandSiemens
HK$7,459.26
單位
Ultrasonic Clamp Mount - PBT - -30°C +60°C - 30V - - - 25 mA -