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 906-9679
製造零件編號RMA-1-SSV
HK$502.76
單位
Air Variable Area 0.05 SCFH 0.5 SCFH - 1/8 in 1/8 NPT Female 6.9bar Polycarbonate - - - +54°C -
RS庫存編號 907-4050
製造零件編號194762
HK$2,150.93
單位
Liquid RotorFlow Electronic 8 gal/min 60 gal/min 4.5 → 24 V dc 1 in 1 NPT Female 13.8bar Brass - +21°C -29°C +100°C 8 mA
RS庫存編號 906-7762
製造零件編號VFA-34-BV
HK$437.88
單位
Liquid Variable Area 20 CC/min 200 CC/min - 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 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 849-9439
製造零件編號PFMV505-1
BrandSMC
HK$1,380.61
單位
Dry Air, Gas Suction 0 L/min 0.5 L/min 12 → 24 V dc 4 mm One-Touch Fitting 500kPa PPS 0 °C +50°C 0°C +50°C -
RS庫存編號 821-3897
製造零件編號HAFBLF0050CAAX5
BrandHoneywell
HK$849.03
單位
Dry Gas Amplified 0 sccm 50 sccm 5 V dc Maximum of 5.35 mm Tubing 25psi High Temperature Polymer - - -20°C +70°C -
RS庫存編號 616-3472
製造零件編號197091
HK$388.65
單位
Liquid Piston - 0.25 gal/min 200 V 1/4 in 1/4 Quick Disconnect Male 8.6bar Glass Reinforced PP -18 °C +100°C -18°C +100°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 -
RS庫存編號 906-7639
製造零件編號RMC-106
HK$976.19
單位
Air Variable Area 100 SCFH 1000 SCFH - 1/2 in 1/2 NPT Female 6.9bar Polycarbonate - - - +54°C -
RS庫存編號 144-9343
製造零件編號850085
BrandXylem
HK$15,336.02
單位
Liquid Flow Meter 0.2 m/s 10 m/s 230 V ac - DN80 - - - - -20°C +60°C -
RS庫存編號 901-0245
製造零件編號198807811
HK$1,828.68
單位
- Variable Area - - - - - - - - - - - -
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 907-3997
製造零件編號173138
HK$1,941.09
單位
Fluid, Liquid RotorFlow 1.5 gal/min 20 gal/min - 1/2 in 1/2 NPT Female 13.8bar Stainless Steel - +21°C -29°C +100°C -
RS庫存編號 906-8086
製造零件編號129660
HK$912.79
單位
Liquid Piston - 0.5 gal/min - 1/2 in 1/2 NPT Male 13.8bar Polypropylene +21.1 °C +65.5°C -17.8°C +100°C -
RS庫存編號 181-0604
製造零件編號E8PC-YL-1
BrandOmron
HK$260.95
單位
- O-Ring - - - - - - - - - -20°C +80°C -
RS庫存編號 907-3962
製造零件編號155425
HK$2,074.11
單位
Liquid RotorFlow Electronic 0.1 gal/min 5 gal/min 24 V dc 1/4 in 1/4 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 901-0227
製造零件編號198807011
HK$2,032.80
單位
Liquid Variable Area 5 l/h 50 L/h - - DN10 Socket - Plastic - - - - -
RS庫存編號 173-2226
製造零件編號ASF1400
BrandSensirion
HK$2,207.21
個 (以毎盒:10)
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 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 616-3494
製造零件編號197093
HK$388.65
單位
Liquid Piston - 1 gal/min 200 V 1/4 in 1/4 Quick Disconnect Male 8.6bar Glass Reinforced PP -18 °C +100°C -18°C +100°C -