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 889-1340
製造零件編號DL14-00
BrandFlowline
HK$3,400.42
單位
Multi Function Ultrasonic Transmitter Vertical Relay Polycarbonate 1.2m -35°C +60°C - 24V 20 mA 30psi Viton - -
RS庫存編號 794-3428
製造零件編號2120D1AK1I1AAA0000
BrandRosemount
HK$4,149.29
單位
Fork Level Switch Side or Top Mount NAMUR Glass Filled Nylon - -40°C +150°C - - 2.5 mA 100bar Non Asbestos Sheet - ATEX
RS庫存編號 889-1400
製造零件編號FT10-1305
BrandFlowline
HK$1,797.37
單位
Liquid and Gas Flow Switch Cable - Polypropylene 3m -40°C +60°C - 36V - 150psi Viton 1 A -
RS庫存編號 463-5458
製造零件編號3UG3207-1B
BrandSiemens
HK$709.10
單位
Electrode Vertical - - 2m - +90°C - - - 10bar PTFE - -
RS庫存編號 889-1403
製造零件編號FT10-5405-50
BrandFlowline
HK$3,683.79
單位
Liquid and Gas Flow Switch Cable - Polypropylene 3m -40°C +60°C - 36V - 150psi Viton 1 A -
RS庫存編號 493-6830
製造零件編號FX-S.61A 10M
BrandVega
HK$2,163.27
單位
Radar - - PBT - - - - - 20 mA 4bar - - -
RS庫存編號 794-3437
製造零件編號2120D1AV1NAAA0000
BrandRosemount
HK$2,604.51
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 613-3386
製造零件編號SG51.XXTGATPVL
BrandVega
HK$2,607.12
單位
Tuning Fork Horizontal PNP Stainless Steel - -40°C +150°C - - 20 mA 64bar - - -
RS庫存編號 776-1604
製造零件編號072.11
BrandFinder
HK$140.80
單位
Sensor Surface Mount Relay Stainless Steel 200m 0°C +100°C - - 30 A - - - -
RS庫存編號 463-5470
製造零件編號3UG3207-2B
BrandSiemens
HK$930.46
單位
Electrode Horizontal - - 2m - +90°C - - - 10bar PTFE - -
RS庫存編號 208-7453
製造零件編號B59010-D1135-B40
BrandEPCOS
HK$127.44
單位
Thermistor - - Stainless Steel - -25°C +55°C - - 45 mA 10bar - - -
RS庫存編號 113-711
製造零件編號7ML5501-0EA10
BrandSiemens
HK$2,217.30
單位
Capacitance Vertical - Stainless Steel 1m -30°C +100°C - - 82 mA 10bar - - -
RS庫存編號 889-1416
製造零件編號GT10-1405
BrandFlowline
HK$2,012.50
單位
- - - - - -40°C +60°C - - - - - 1 A -
RS庫存編號 889-1330
製造零件編號DL10-00
BrandFlowline
HK$2,963.23
單位
Ultrasonic Level Transmitter Vertical - Polycarbonate 1.2m -35°C +60°C - 24V 20 mA 30psi Viton - -
RS庫存編號 392-7841
製造零件編號3UG3207-3A
BrandSiemens
HK$743.05
單位
Electrode Horizontal - - 2m - +90°C - - - 10bar PTFE - -
RS庫存編號 901-0292
製造零件編號FX82.IXXTBFHXKMXX
BrandVega
HK$14,325.81
單位
TDR Sensor Cable HART Stainless Steel 75m -40°C +80°C 253V 48V 20 mA 40bar EPDM Rubber, FFKM, FKM 4 → 20 mA -
RS庫存編號 768-1956
製造零件編號SONS61.EXXX
BrandVega
HK$6,223.01
單位
Vibrating Rod - Relay - - - - - - 20 mA - - - -
RS庫存編號 906-7670
製造零件編號SBLT2-5-40
HK$2,654.80
單位
Level Transmitter Cable - Stainless Steel 480.3in -18°C +66°C - 30V 20 mA dc 5psi - - -
RS庫存編號 124-0112
製造零件編號DL24-01
BrandFlowline
HK$4,196.50
單位
Ultrasonic Level Transmitter Vertical - PC 1.2m -35°C +60°C - 24V 20 mA 2bar FKM 1 A -
RS庫存編號 124-0110
製造零件編號DL10-01
BrandFlowline
HK$2,997.46
單位
Ultrasonic Level Transmitter Vertical - ABS, PC 1.2m -35°C +60°C - 24V 20 mA 2bar FKM - -