Flow Sensors & Indicators

Flow sensors and flow indicators are flowmeter devices used to measure the amount of liquid, gas or vapour that passes through them. They can also be known as flow gauges or liquid meters. Flow sensors are available as time measuring units, that measure flow rates over a set time period, or they can be totalising flow meters that continually measure the medium passed through.


Flow sensors consist of a primary medium connection device, transducer and transmitter. The transducer senses the fluid that passes through the primary device. The transmitter produces an output signal from the raw transducer signal.


Types of Flow Sensors and Indicators


Paddlewheel Flow Sensors or Turbine: One of the most common types of flow sensor. The sensors are connected to a pipe with liquid passing through and turning a paddle wheel, the primary device calculates the speed as the paddle is turned. This simple structure is compact and can perform large-capacity measurement. Disadvantages are clogging and maintenance is required to cope with the axial wear otherwise the paddle needs replacing.


Rotaflow or Variable Area Flow Sensors: Rotaflow meters are a tapered tube and a float. It is most widely used for gases and liquids flow measurement because of its low cost, simplicity, low pressure drop and linear output.


Magnetic-Inductive Sensors: This type of sensor detects three process categories, volumetric flow quantity, consumed quantity and medium temperature.


Applications for Flow Sensors


Each type of flow sensor has its own specific applications and installation constraints. There is no one size fits all flowmeter. The way to select the right flowmeter is to think about the application as a guide, not the technology. Many of the technologies work well on many applications. Starting with the application, will help to select the technology based on accuracy, cost, durability and reliability, rather than trying to make the technology fit the application you have. Can include the following applications:


  • Water treatment

  • Cooling systems

  • Industrial Washing Systems

  • Irrigation

Things to consider:


  • What is the fluid being measured, if not water what is its viscosity?

  • Rate measurement or totalisation?

  • Display or signal output?

  • What is the minimum and maximum flowrate, process pressure and process temperature?

  • Size of the pipe

...
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Description Price Media Monitored Device Type Minimum Flow Rate Maximum Flow Rate Supply Voltage Pipe Diameter Range Connection Type Maximum Pressure Material Minimum Media Temperature Maximum Media Temperature Minimum Operating Temperature Maximum Operating Temperature Current Rating
RS庫存編號 906-8336
製造零件編號197083
HK$556.09
單位
Liquid Piston - 1 gal/min - 3/8 in 3/8 NPT 8.6bar Glass Reinforced Polypropylene - +21°C -18°C +100°C -
RS庫存編號 901-0258
製造零件編號198807005
HK$1,416.25
單位
Liquid Variable Area 20 l/h 200 L/h - - DN25 Socket - Plastic - - - - -
RS庫存編號 906-7765
製造零件編號VFA-3
HK$333.27
單位
Air Variable Area 0.6 SCFH 5 SCFH - 1/8 in 1/8 NPT Female 6.9 (With Valve) bar, 10 (Without Valve) bar Acrylic Plastic - +38 (Without Valve) °C, +48 (With Valve) °C - - -
RS庫存編號 907-3993
製造零件編號165077
HK$3,409.97
單位
Liquid RotorFlow Electronic 1.5 gal/min 20 gal/min 24 V dc 1/2 in 1/2 NPT Female 13.8bar Stainless Steel - +21°C -29°C +100°C 20 mA @ 24 V dc (No Load), 35 mA @ 24 V dc (Load)
RS庫存編號 181-0613
製造零件編號E8PC-100-E
BrandOmron
HK$5,058.54
單位
Liquid Flow Sensor 0 MPa 10 MPa 10 → 30 V dc G3/4 Male in M12 4 Pole Connector 10MPa Al2O3 ((alumina) Diaphragm Pressure Port), FKM (O-Ring), PBT (Button), PES (Display Unit), PPSU (Head), SUS304L (Chassis), SUS304L (Pressure Port) -20 °C +100°C -20°C +80°C 120 mA
RS庫存編號 286-282
製造零件編號EF.7731111291
BrandParker
HK$2,610.97
單位
Liquid Variable Area 2 L/min 30 L/min 240 V ac 1 in 1 BSP Female 10bar PET - - +5°C +60°C -
RS庫存編號 740-6433
製造零件編號SM8000
HK$5,553.99
單位
Liquid Magnetic-Inductive 0.2 L/min 100 L/min 19 → 30 V dc - 1 BSP 16bar PBT, Stainless Steel -20 °C +80°C -10°C +60°C -
RS庫存編號 901-0069
製造零件編號198840143
HK$5,122.45
單位
Liquid Paddlewheel 0.1 m/s 6 m/s 5 → 24 V dc 0.5 → 4.0 in DN15 to DN 100 Socket 12.5bar Polypropylene - - -18°C +85°C <1.5 mA @ 3.3 → 6 V dc, <20 mA @ 6 → 24 V dc
RS庫存編號 849-9417
製造零件編號PFM750S-N7L-A-A
BrandSMC
HK$2,933.37
單位
Air, Gas Flow Switch 1 L/min 25 (CO2) L/min, 50 (Ar) L/min, 50 (Dry Air) L/min, 50 (N2) L/min 24 V dc - 1/4 inch One-Touch Fitting 1MPa PBT 0 °C +50°C 0°C +50°C -
RS庫存編號 198-3007
製造零件編號FR2A15BVBN
HK$795.75
單位
Gas Variable Area 1 L/min 10 L/min - 1/8 in 1/8 NPT Female 6.89bar Acrylic - +65°C - +65°C -
RS庫存編號 125-0660
製造零件編號SPI-N118-1421-1-3-001
BrandSimex
HK$2,401.93
單位
Gas, Liquid Flow Counter - - 24 V dc - M12 - ABS, Fibreglass - - 0°C +50°C 100 mA
RS庫存編號 898-6731
製造零件編號LG01-2000A090
BrandSensirion
HK$1,282.05
單位
Liquid Liquid Flow Switch 250 (Isopropyl Alcohol) 50 (Water) ml/min, 250 (Isopropyl Alcohol) ml/min 5 → 12 V 9.2 mm 5 Pin PCB Header 3bar Borosilicate Glass (Tube Material), FEP (Sealing), PEEk (Fitting) - - +10°C +50°C 6.8 mA
RS庫存編號 906-9730
製造零件編號RMB-85-SSV
HK$638.38
單位
Liquid Variable Area 10 gal/h 100 gal/h - 1/4 in 1/4 NPT Female 6.9bar Polycarbonate - - - +54°C -
RS庫存編號 906-7790
製造零件編號VFB-52
HK$559.26
單位
Air Variable Area 4 SCFH 40 SCFH - 1/8 in 1/8 NPT Female 6.9 (With Valve) bar, 10 (Without Valve) bar Acrylic Plastic - +38 (Without Valve) °C, +48 (With Valve) °C - - -
RS庫存編號 395-6833
製造零件編號155480BSPP
HK$509.22
單位
Liquid RotorFlow 15 L/min 75 L/min - 1/2 in 1/2 BSP Female 6.9bar Polypropylene -29 °C +82°C -29°C +82°C -
RS庫存編號 907-3959
製造零件編號155420
HK$545.94
單位
Fluid, Liquid RotorFlow 0.1 gal/min 5 gal/min - 1/4 in 1/4 NPT Female 6.9bar Polypropylene - +21°C -29°C +82°C -
RS庫存編號 395-184
製造零件編號AWM5101VN
BrandHoneywell
HK$1,194.75
單位
Dry Gas Amplified 0 sLpm 5 SLPM 15 V dc - 1/4 NPT 50psi Plastic - - 0°C +50°C -
RS庫存編號 286-298
製造零件編號EF.7731114291
BrandParker
HK$2,605.55
單位
Liquid Variable Area 10 L/min 150 L/min 240 V ac 1 in 1 BSP Female 10bar PET - - +5°C +60°C -
RS庫存編號 907-3928
製造零件編號70824
HK$1,008.11
單位
Liquid Piston - 1 gal/min - 1/4 in 1/4 NPT Female 69bar Brass - - -29°C +93.3°C -
RS庫存編號 740-6436
製造零件編號SU7000
HK$6,066.87
單位
Liquid Ultrasonic 0 L/min 50 L/min 19 → 30 V dc - 3/4 BSP 16bar Aluminium Alloy -10 °C +80°C -10°C +60°C -