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 sensors 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. 124-0112
Mfr. Part No.DL24-01
BrandFlowline
HK$4,562.27
Each
units
Ultrasonic Level Transmitter Vertical - PC 1.2m -35°C +60°C - 24V 20 mA 2bar FKM 1 A -
RS Stock No. 386-957
Mfr. Part No.WAVES61.EXX2RA
BrandVega
HK$3,343.39
Each
units
Tuning Fork Horizontal Relay Aluminium/PBT - -40°C +80°C - - 1 A dc, 3 A ac 25bar - - -
RS Stock No. 493-6830
Mfr. Part No.FX-S.61A 10M
BrandVega
HK$2,166.85
Each
units
Radar - - PBT - - - - - 20 mA 4bar - - -
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. 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. 463-5458
Mfr. Part No.3UG3207-1B
BrandSiemens
HK$811.32
Each
units
Electrode Vertical - - 2m - +90°C - - - 10bar PTFE - -
RS Stock No. 889-1403
Mfr. Part No.FT10-5405-50
BrandFlowline
HK$3,703.01
Each
units
Liquid and Gas Flow Switch Cable - Polypropylene 3m -40°C +60°C - 36V - 150psi Viton 1 A -
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. 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. 113-711
Mfr. Part No.7ML5501-0EA10
BrandSiemens
HK$2,425.28
Each
units
Capacitance Vertical - Stainless Steel 1m -30°C +100°C - - 82 mA 10bar - - -
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. 869-7671
Mfr. Part No.ILLS-G1000-D-015
BrandCynergy3
HK$3,525.83
Each
units
Pressure Cable 0.5-4.5V Stainless Steel 15m -20°C +60°C - 32V - 50bar - - -
RS Stock No. 137-2042
Mfr. Part No.LR21-5321-30-01
BrandFlowline
HK$38,346.39
Each
units
Pulse Radar Liquid Level Transmitter Vertical HART 7, 2 Wire, 4 to 20 mA Stainless Steel 316L - -40°C +150°C - 26.4V 20 mA 5bar Silicone 22.5 mA -
RS Stock No. 124-0116
Mfr. Part No.LM50-1001-1
BrandFlowline
HK$373.06
Each
units
- - - - - - - - - - - - - -
RS Stock No. 182-8937
Mfr. Part No.44S0003
BrandUnipower
HK$41.963
Each (In a Pack of 3)
units
Electrode - - Stainless Steel - -10°C +65°C - - - - - - -
RS Stock No. 137-2043
Mfr. Part No.LR31-0021-10-01
BrandFlowline
HK$34,490.03
Each
units
Pulse Radar Liquid Level Transmitter Vertical, Wall Mount HART 7, 2 Wire, 4 to 20 mA Nylon, Polycarbonate (Display) 10m -40°C +100°C - 26.4V 20 mA - - 22.5 mA -
RS Stock No. 137-2044
Mfr. Part No.US01-0001-01
BrandFlowline
HK$6,940.25
Each
units
Reflective Ultrasonic Liquid Level Transmitter Horizontal, Vertical 2 Wire, 4 to 20 mA Polypropylene 1.2m -40°C +80°C - 28V 20 mA 2bar - - -
RS Stock No. 780-0309
Mfr. Part No.OLS200D3SH
BrandCynergy3
HK$341.60
Each
units
Optical Sensor Chassis Mount Transistor Polysulfone 250mm -25°C +80°C - - 100 mA 7bar - - -
RS Stock No. 124-0126
Mfr. Part No.LU80-5101
BrandFlowline
HK$5,760.50
Each
units
Ultrasonic Level Transmitter Vertical - PC - -40°C +71°C - 28V 20 mA 2bar FKM - -
RS Stock No. 869-7703
Mfr. Part No.ILSE-G0250-D
BrandCynergy3
HK$1,843.65
Each
units
Pressure Chassis Mount 0.5-4.5V Stainless Steel - - - - 32V - 20bar - - -
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