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 889-1453
製造零件編號LD31-S131
BrandFlowline
HK$7,529.51
單位
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庫存編號 780-0175
製造零件編號SSF22X100-18N
BrandCynergy3
HK$530.24
單位
Level Switch Vertical - Stainless Steel 1m -20°C +120°C - - 500 mA 10bar - - -
RS庫存編號 386-957
製造零件編號WAVES61.EXX2RA
BrandVega
HK$3,343.39
單位
Tuning Fork Horizontal Relay Aluminium/PBT - -40°C +80°C - - 1 A dc, 3 A ac 25bar - - -
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 285-778
製造零件編號FFAK 16 PTD 1099/L
BrandBaumer
HK$1,240.00
單位
Liquid Level Sensor Vertical/Horizontal PNP Polysulphone - 0°C +65°C - - 200 mA 10bar - - -
RS庫存編號 513-2427
製造零件編號7ML5610-0BD20
BrandSiemens
HK$1,700.00
單位
Capacitance - Relay Polyphenylene Sulfide - -40°C +85°C - - 20 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 204-6733
製造零件編號003H2
BrandMobrey
HK$1,966.73
單位
Gap Sensor Level Alarm Switch Horizontal, Vertical FET Polyphenylene Sulfide 3m -40°C +105°C - - 100 mA 5bar - - -
RS庫存編號 511-5157
製造零件編號VLSKB131Z
BrandMobrey
HK$3,914.46
單位
Solids Level Switch Horizontal, Vertical Relay Aluminium Alloy - -20°C +110°C - - 8 A 10bar - - -
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 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 186-0287
製造零件編號7ML5110-1GF07-4AF3
BrandSiemens
HK$12,045.86
單位
Ultrasonic - - PBT, PC - -40°C +80°C - 30V - 0.5bar - - ATEX
RS庫存編號 869-7677
製造零件編號ILLS-G0750-D-010
BrandCynergy3
HK$3,020.34
單位
Pressure Cable 0.5-4.5V Stainless Steel 10m -20°C +60°C - 32V - 50bar - - -
RS庫存編號 794-3415
製造零件編號211000A1NA
BrandRosemount
HK$1,448.40
單位
Fork Level Switch Side or Top Mount Direct Load Stainless Steel - -40°C +150°C - - 500 mA 100bar - - -
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 857-3590
製造零件編號VNI4
HK$2,443.89
單位
Conductive Cable Relay Nylon 6 2m 0°C +90°C - - - 10bar - - -
RS庫存編號 869-7652
製造零件編號ILLS-G0250-5-005
BrandCynergy3
HK$2,146.26
單位
Pressure Cable 4-20mA Stainless Steel 5m -20°C +60°C - 32V 28 mA 20bar - - -
RS庫存編號 419-4654
製造零件編號SWING61XXGBVXPRX
BrandVega
HK$4,463.78
單位
Vibrating Rod Horizontal, Vertical Relay Plastic - -50°C +150°C - - 1 A dc, 3 A ac 64bar - - -
RS庫存編號 869-7655
製造零件編號ILLS-G0500-5-007
BrandCynergy3
HK$2,334.88
單位
Pressure Cable 4-20mA Stainless Steel 7m -20°C +60°C - 32V 28 mA 10bar - - -
RS庫存編號 419-4660
製造零件編號SWING61XXGAVXPRX
BrandVega
HK$4,622.81
單位
Vibrating Fork Horizontal, Vertical Relay Plastic - -50°C +150°C - - 1 A dc, 3 A ac 64bar - - -