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 Stock No. 185-9881
Mfr. Part No.S01DB/F21/1
BrandMobrey
HK$5,199.45
Each
units
Liquid Level Switch Top Mount SPST Aluminium Bronze - - - +210°C - - 2 A dc, 5 A ac 18bar Non Asbestos Sheet -
RS Stock No. 113-711
Mfr. Part No.7ML5501-0EA10
BrandSiemens
HK$2,436.79
Each
units
Capacitance Vertical - Stainless Steel 1m - -30°C +100°C - - 82 mA 10bar - -
RS Stock No. 124-0112
Mfr. Part No.DL24-01
BrandFlowline
HK$4,583.93
Each
units
Ultrasonic Level Transmitter Vertical - PC 1.2m - -35°C +60°C - 24V 20 mA 2bar FKM 1 A
RS Stock No. 511-5157
Mfr. Part No.VLSKB131Z
BrandMobrey
HK$4,225.25
Each
units
Solids Level Switch Horizontal, Vertical Relay Aluminium Alloy - - -20°C +110°C - - 8 A 10bar - -
RS Stock No. 124-0110
Mfr. Part No.DL10-01
BrandFlowline
HK$3,355.19
Each
units
Ultrasonic Level Transmitter Vertical - ABS, PC 1.2m - -35°C +60°C - 24V 20 mA 2bar FKM -
RS Stock No. 780-0175
Mfr. Part No.SSF22X100-18N
BrandCynergy3
HK$697.92
Each
units
Level Switch Vertical - Stainless Steel 1m - -20°C +120°C - - 500 mA 10bar - -
RS Stock No. 889-1453
Mfr. Part No.LD31-S131
BrandFlowline
HK$7,529.51
Each
units
Pressure Level Transmitter Horizontal, Vertical 2 Wire Buna-N, Stainless Steel 316, Stainless Steel 316L 18.3m - -18°C +66°C - 30V 20 mA 20psi - -
RS Stock No. 906-7670
Mfr. Part No.SBLT2-5-40
HK$2,668.61
Each
units
Level Transmitter Cable - Stainless Steel 480.3in - -18°C +66°C - 30V 20 mA dc 5psi - -
RS Stock No. 794-3428
Mfr. Part No.2120D1AK1I1AAA0000
BrandRosemount
HK$4,550.52
Each
units
Fork Level Switch Side or Top Mount NAMUR Glass Filled Nylon - - -40°C +150°C - - 2.5 mA 100bar Non Asbestos Sheet -
RS Stock No. 804-4130
Mfr. Part No.7ML1115-0CA30
BrandSiemens
HK$5,937.36
Each
units
Ultrasonic - - - - - -20°C +95°C - - - - - -
RS Stock No. 889-1400
Mfr. Part No.FT10-1305
BrandFlowline
HK$1,973.40
Each
units
Liquid and Gas Flow Switch Cable - Polypropylene 3m - -40°C +60°C - 36V - 150psi Viton 1 A
RS Stock No. 889-1403
Mfr. Part No.FT10-5405-50
BrandFlowline
HK$3,720.63
Each
units
Liquid and Gas Flow Switch Cable - Polypropylene 3m - -40°C +60°C - 36V - 150psi Viton 1 A
RS Stock No. 392-7841
Mfr. Part No.3UG3207-3A
BrandSiemens
HK$849.19
Each
units
Electrode Horizontal - - 2m - - +90°C - - - 10bar PTFE -
RS Stock No. 889-1416
Mfr. Part No.GT10-1405
BrandFlowline
HK$2,127.27
Each
units
- - - - - - -40°C +60°C - - - - - 1 A
RS Stock No. 204-6733
Mfr. Part No.003H2
BrandMobrey
HK$2,662.09
Each
units
Gap Sensor Level Alarm Switch Horizontal, Vertical FET Polyphenylene Sulfide 3m - -40°C +105°C - - 100 mA 5bar - -
RS Stock No. 463-5470
Mfr. Part No.3UG3207-2B
BrandSiemens
HK$1,061.52
Each
units
Electrode Horizontal - - 2m - - +90°C - - - 10bar PTFE -
RS Stock No. 901-0292
Mfr. Part No.FX82.IXXTBFHXKMXX
BrandVega
HK$14,125.65
Each
units
TDR Sensor Cable HART Stainless Steel 75m - -40°C +80°C 253V 48V 20 mA 40bar EPDM Rubber, FFKM, FKM 4 → 20 mA
RS Stock No. 889-1330
Mfr. Part No.DL10-00
BrandFlowline
HK$3,451.45
Each
units
Ultrasonic Level Transmitter Vertical - Polycarbonate 1.2m - -35°C +60°C - 24V 20 mA 30psi Viton -
RS Stock No. 386-957
Mfr. Part No.WAVES61.EXX2RA
BrandVega
HK$3,544.50
Each
units
Tuning Fork Horizontal Relay Aluminium/PBT - - -40°C +80°C - - 1 A dc, 3 A ac 25bar - -
RS Stock No. 513-2427
Mfr. Part No.7ML5610-0BD20
BrandSiemens
HK$1,349.58
Each
units
Capacitance - Relay Polyphenylene Sulfide - - -40°C +85°C - - 20 mA 10bar - -
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