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 181-0608
製造零件編號E8PC-010T-E
BrandOmron
HK$5,058.54
單位
Gas, Liquid Flow Sensor -0.1 MPa 1 MPa 10 → 30 V dc G3/4 Male in M12 4 Pole Connector 1MPa 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 906-7771
製造零件編號VFA-3-BV
HK$437.88
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 123-7147
製造零件編號ASF1400
BrandSensirion
HK$2,508.88
單位
Air, Gas Flow Meter -400 sccm 400 sccm 7 → 18 V dc 5 mm RS-232, SPI 2bar PBT 0 °C +70°C 0°C +70°C 20 mA
RS庫存編號 181-0601
製造零件編號E8PC-YA-C14
BrandOmron
HK$846.71
單位
- Adapter - - - - NPT 1/2 Male - SUS304 - - -20°C +80°C -
RS庫存編號 447-4427
BrandRS PRO
HK$3,587.69
單位
Liquid Oval Gear 0.01 L/min 1 L/min 5 → 24 V dc 1/4 in 1/4 BSP 50bar Stainless Steel - - - - -
RS庫存編號 907-3830
製造零件編號29609
HK$2,171.82
單位
Liquid Paddle 15 gal/min 52 gal/min - 1 in 1 NPT Male 138bar Brass - - -34.4°C +148.9°C -
RS庫存編號 173-2223
製造零件編號LG01-2000A090
BrandSensirion
HK$1,225.092
Each (In a Tray of 25)
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 907-3978
製造零件編號155485
HK$2,061.75
單位
Liquid RotorFlow Electronic 1.5 gal/min 20 gal/min 24 V dc 1/2 in 1/2 NPT Female 6.9bar Polypropylene - +21°C -29°C +82°C 20 mA @ 24 V dc (No Load), 35 mA @ 24 V dc (Load)
RS庫存編號 906-7793
製造零件編號VFA-9
HK$333.27
單位
Air Variable Area 20 SCFH 200 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 136-6374
製造零件編號710-V10-D-RS
BrandAtrato
HK$7,328.92
單位
- - - - - - - - - - - - - -
RS庫存編號 123-7151
製造零件編號SFM4100 Air
BrandSensirion
HK$1,318.95
單位
Gas Digital Mass 0 slm 20 slm 3.5 → 9 V 15.35 mm 2-Wire I2C 6 bar, 10 (Over Pressure) bar Aluminium (Coated), Epoxy, Gold, Nickel Plated Brass, Nitrile, Nylon, Oxygenoex, Pa-12, Si, Si3n4, Siox, Stainless Steel, Viton® 0 °C +50°C -20°C +80°C <12.5 mA
RS庫存編號 849-9411
製造零件編號PFM750-N7-E-M-WR
BrandSMC
HK$2,716.51
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 395-6877
製造零件編號156261BSPP
HK$1,348.10
單位
Liquid RotorFlow Electronic 2 L/min 20 L/min 4.5 → 24 V dc 1/4 in 1/4 BSP Female 13.8bar Brass -29 °C +100°C -29°C +100°C -
RS庫存編號 123-7149
製造零件編號SFM3000-200C
BrandSensirion
HK$877.90
單位
Gas Low Pressure Drop -200 slm 200 slm 5 V 22 mm 2-Wire I2C 1.3bar Epoxy, Gold, Polyurethane, PPE+PS Blend, Si, Si3n4, Siox, Stainless Steel (Annealed) -20 °C +80°C -20°C +80°C -
RS庫存編號 198-0660
製造零件編號FM.26 122 129
BrandParker
HK$2,704.22
單位
Liquid Variable Area 0.2 L/min 2 L/min - 1/4 in 1/4 BSP - Brass - - - +90°C -
全新
RS庫存編號 187-9059
製造零件編號071-06402
HK$1,001.93
單位
Air Air Bubble Detector - - 5 → 24 V dc - - - ABS/PC Plastic - - 0°C +40°C -
RS庫存編號 907-3953
製造零件編號155421
HK$1,138.45
單位
Liquid RotorFlow Electronic 0.1 gal/min 5 gal/min 4.5 → 24 V dc 1/4 in 1/4 NPT Female 6.9bar Ploypropylene - +21°C -29°C +82°C 8 mA
RS庫存編號 804-3904
製造零件編號7MF4433-1BA22-2RB1
BrandSiemens
HK$17,091.85
單位
Gas, Liquid, Vapour Digital Pressure Transmitter - - 9 → 24 V - 1/4 NPT 0.02bar Aluminium -40 °C +85°C -40°C +85°C -
RS庫存編號 313-5553
製造零件編號426506
BrandBurkert
HK$14,430.00
單位
- - - - 18 → 36 V dc DN 6 → 400 mm - - - - - -10°C +60°C -
RS庫存編號 198-0705
製造零件編號FM.26 322 129
BrandParker UCC
HK$2,789.84
單位
Liquid Variable Area 5 L/min 55 L/min - 3/4 in 3/4 BSP - Brass - - - +90°C -