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 906-9648
製造零件編號PUB-10
HK$47,352.67
單位
Liquid Portable Ultrasonic 0.1 m/s 20 m/s 9 → 24 V dc 13 → 115 mm - - ABS Plastic - - -20°C +135°C -
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 906-9730
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 906-7829
製造零件編號VFB-86-SSV
HK$790.46
單位
Liquid Variable Area 0.6 gal/min 5 gal/min - 1/4 in, 3/8 in 1/4 NPT, 3/8 NPT 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 906-7655
製造零件編號RMC-145
HK$1,084.65
單位
Liquid Variable Area 1.2 gal/min 10 gal/min - 1/2 in 1/2 NPT Female 6.9bar Polycarbonate - - - +54°C -
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 906-7649
製造零件編號RMC-122
HK$1,084.65
單位
Air Variable Area 2 SCFM 20 SCFM - 1/2 in 1/2 NPT Female 6.9bar Polycarbonate - - - +54°C -
RS庫存編號 906-9708
製造零件編號RMA-7-SSV
HK$502.76
單位
Air Variable Area 5 SCFH 50 SCFH - 1/8 in 1/8 NPT Female 6.9bar Polycarbonate - - - +54°C -
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 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 906-7816
製造零件編號VFB-60-BV
HK$677.47
單位
Air Variable Area 100 CC/min 1000 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 906-7639
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 906-7774
製造零件編號VFA-3-SSV
HK$579.20
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 906-7807
製造零件編號VFB-53-BV
HK$677.47
單位
Air Variable Area 10 SCFH 100 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 906-7768
製造零件編號VFA-34
HK$333.27
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 906-9691
製造零件編號RMA-45-SSV
HK$502.76
單位
Liquid Variable Area 5 gal/h 50 gal/h - 1/8 in 1/8 NPT Female 6.9bar Polycarbonate - - - +54°C -
RS庫存編號 906-9720
製造零件編號RMB-55-SSV
HK$638.38
單位
Air Variable Area 40 SCFH 400 SCFH - 1/4 in 1/4 NPT Female 6.9bar Polycarbonate - - - +54°C -
RS庫存編號 906-7636
製造零件編號RMC-103-SSV
HK$1,491.51
單位
Air Variable Area 20 SCFH 200 SCFH - 1/2 in 1/2 NPT Female 6.9bar Polycarbonate - - - +54°C -
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 - - -