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 Stock No. 208-7453
Mfr. Part No.B59010-D1135-B40
BrandEPCOS
HK$127.44
Each
units
Thermistor - - Stainless Steel - -25°C +55°C - - 45 mA 10bar - - -
RS Stock No. 776-1604
Mfr. Part No.072.11
BrandFinder
HK$140.80
Each
units
Sensor Surface Mount Relay Stainless Steel 200m 0°C +100°C - - 30 A - - - -
RS Stock No. 392-7841
Mfr. Part No.3UG3207-3A
BrandSiemens
HK$743.05
Each
units
Electrode Horizontal - - 2m - +90°C - - - 10bar PTFE - -
RS Stock No. 794-3437
Mfr. Part No.2120D1AV1NAAA0000
BrandRosemount
HK$2,604.51
Each
units
Fork Level Switch Side or Top Mount Relay Glass Filled Nylon - -40°C +150°C - - 500 mA 100bar Non Asbestos Sheet - -
RS Stock No. 124-0110
Mfr. Part No.DL10-01
BrandFlowline
HK$2,997.46
Each
units
Ultrasonic Level Transmitter Vertical - ABS, PC 1.2m -35°C +60°C - 24V 20 mA 2bar FKM - -
RS Stock No. 463-5470
Mfr. Part No.3UG3207-2B
BrandSiemens
HK$930.46
Each
units
Electrode Horizontal - - 2m - +90°C - - - 10bar PTFE - -
RS Stock No. 513-2427
Mfr. Part No.7ML5610-0BD20
BrandSiemens
HK$1,700.00
Each
units
Capacitance - Relay Polyphenylene Sulfide - -40°C +85°C - - 20 mA 10bar - - -
RS Stock No. 889-1403
Mfr. Part No.FT10-5405-50
BrandFlowline
HK$3,683.79
Each
units
Liquid and Gas Flow Switch Cable - Polypropylene 3m -40°C +60°C - 36V - 150psi Viton 1 A -
RS Stock No. 285-778
Mfr. Part No.FFAK 16 PTD 1099/L
BrandBaumer
HK$1,240.00
Each
units
Liquid Level Sensor Vertical/Horizontal PNP Polysulphone - 0°C +65°C - - 200 mA 10bar - - -
RS Stock No. 889-1400
Mfr. Part No.FT10-1305
BrandFlowline
HK$1,797.37
Each
units
Liquid and Gas Flow Switch Cable - Polypropylene 3m -40°C +60°C - 36V - 150psi Viton 1 A -
RS Stock No. 613-3386
Mfr. Part No.SG51.XXTGATPVL
BrandVega
HK$2,607.12
Each
units
Tuning Fork Horizontal PNP Stainless Steel - -40°C +150°C - - 20 mA 64bar - - -
RS Stock No. 122-8433
Mfr. Part No.232180
HK$1,527.16
Each
units
Electro Optic Vertical/Horizontal NC Brass 6in -40°C +110°C - 5V - 17bar - 4 mA -
RS Stock No. 122-8434
Mfr. Part No.232181
HK$1,527.16
Each
units
Electro Optic Vertical/Horizontal NC Brass 6in -40°C +110°C - 12V - 17bar - 10 mA -
RS Stock No. 859-2945
Mfr. Part No.CLP2EA1C115
HK$1,831.18
Each
units
Conductive Plug DPDT Relay NORYL PPO 100m -20°C +50°C - - 8 A - - - -
RS Stock No. 857-3212
Mfr. Part No.VPC310
HK$1,467.76
Each
units
Conductive Chassis Mount Relay PVC 2m 0°C +60°C - - - 2bar - - -
RS Stock No. 780-0309
Mfr. Part No.OLS200D3SH
BrandCynergy3
HK$270.69
Each
units
Optical Sensor Chassis Mount Transistor Polysulfone 250mm -25°C +80°C - - 100 mA 7bar - - -
RS Stock No. 780-0292
Mfr. Part No.SB20
BrandCynergy3
HK$796.43
Each
units
- - - - - 0°C +50°C - - - - - - -
RS Stock No. 859-2948
Mfr. Part No.CLP2EA1CM24
HK$1,464.94
Each
units
Conductive Plug DPDT Relay NORYL PPO 100m -20°C +50°C - - 8 A - - - -
RS Stock No. 794-3424
Mfr. Part No.2120D1AT1NAAM0150
BrandRosemount
HK$5,013.53
Each
units
Fork Level Switch Side or Top Mount Direct Load Glass Filled Nylon - -40°C +150°C - - 500 mA 100bar Non Asbestos Sheet - -
RS Stock No. 906-8147
Mfr. Part No.155660
HK$655.06
Each
units
Level Switch Horizontal SPST Zinc Alloy 24in -40°C +121°C - - - 100psi - - -
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