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 208-7453
製造零件編號B59010-D1135-B40
BrandEPCOS
HK$99.69
單位
Thermistor - - Stainless Steel - - -25°C +55°C - - 45 mA 10bar - -
RS庫存編號 463-5458
製造零件編號3UG3207-1B
BrandSiemens
HK$811.32
單位
Electrode Vertical - - 2m - - +90°C - - - 10bar PTFE -
RS庫存編號 392-7841
製造零件編號3UG3207-3A
BrandSiemens
HK$849.19
單位
Electrode Horizontal - - 2m - - +90°C - - - 10bar PTFE -
RS庫存編號 804-4130
製造零件編號7ML1115-0CA30
BrandSiemens
HK$5,937.36
單位
Ultrasonic - - - - - -20°C +95°C - - - - - -
RS庫存編號 889-1352
製造零件編號DL14-10
BrandFlowline
HK$4,032.83
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 122-4867
製造零件編號LVL-A7-AG3A-E5PU-NA
HK$1,773.00
單位
Limit Switch Flush Mount PNP Stainless Steel 316L 5m - -40°C +70°C - 35V 250 mA 40bar - <15 (DC-PNP) mA
RS庫存編號 513-2427
製造零件編號7ML5610-0BD20
BrandSiemens
HK$1,349.58
單位
Capacitance - Relay Polyphenylene Sulfide - - -40°C +85°C - - 20 mA 10bar - -
RS庫存編號 794-3437
製造零件編號2120D1AV1NAAA0000
BrandRosemount
HK$2,656.94
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 189-2699
製造零件編號LBFS-01121.0
BrandBaumer
HK$1,388.98
單位
Level Switch Bottom Mount, Side Mount, Top Mount PNP Stainless Steel 5m - -40°C +85°C - 30V 50 mA 100bar - 50 mA
RS庫存編號 175-5066
製造零件編號PFT-FRBX40SF1OSSAMSSZ
BrandSick
HK$3,485.09
單位
Hydrostatic Level Sensor G1 Thread 2 Wire, 4 to 20 mA Stainless Steel 1.4571 - - -20°C +80°C - 30V 20 mA 0.4bar - -
RS庫存編號 539-5735
製造零件編號CP64.XXFGARKMX L=300
BrandVega
HK$10,566.08
單位
Capacitance Horizontal, Vertical Relay PTFE - - -50°C +200°C - - 1 A dc, 3 A ac 64bar - -
RS庫存編號 193-6791
製造零件編號LLG610D324-003-D
HK$2,013.44
單位
Liquid Level Switch Threaded Mount NPN Stainless Steel 316L - - -40°C +125°C - 30V 7.5 mA 100bar - 7.5 mA
RS庫存編號 124-0113
製造零件編號DL34-01
BrandFlowline
HK$6,872.28
單位
Ultrasonic Level Sensor Vertical - PC 1.2m - -35°C +60°C - 24V 20 mA 2bar FKM 1 A
RS庫存編號 122-8429
製造零件編號232176
HK$1,498.86
單位
Electro Optic Vertical/Horizontal NC Brass 6in - -40°C +110°C - 5V - 17bar - 4 mA
RS庫存編號 740-6442
製造零件編號LMT100
HK$1,676.60
單位
Electronic Flush Mount PNP NO/NC FPM, PA12, PEEK, Stainless Steel - - 0°C +60°C - - 50 mA 16bar PEEK -
RS庫存編號 189-2700
製造零件編號LBFS-01L21.0
BrandBaumer
HK$1,957.96
單位
Level Switch Bottom Mount, Side Mount, Top Mount PNP Stainless Steel 5m - -40°C +85°C - 30V 50 mA 5bar - 50 mA
RS庫存編號 137-2039
製造零件編號LR11-5421-01
BrandFlowline
HK$31,231.13
單位
Pulse Radar Liquid Level Transmitter Vertical HART 7, 2 Wire, 4 to 20 mA Stainless Steel 316L - - -40°C +130°C - 26.4V 20 mA 3bar Silicone 22.5 mA
RS庫存編號 468-3441
製造零件編號SN62XXAGHKMA
BrandVega
HK$13,560.22
單位
Ultrasonic - - Plastic - - -40°C +80°C - - 20 mA 2bar - -
RS庫存編號 188-5257
製造零件編號VN1
HK$340.34
單位
Conductive Cable - Nylon 6 2m - 0°C +90°C - - - 10bar - -