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 173-2224
製造零件編號LG01-2000A005
BrandSensirion
HK$1,292.001
Each (In a Tray of 25)
單位
Liquid Liquid Flow Switch 250 (Isopropyl Alcohol) 220 (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 898-6738
製造零件編號LG01-2000A005
BrandSensirion
HK$1,238.49
單位
Liquid Liquid Flow Switch 250 (Isopropyl Alcohol) 220 (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 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 123-7150
製造零件編號SFM3000-200
BrandSensirion
HK$886.88
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 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 123-7151
製造零件編號SFM4100 Air
BrandSensirion
HK$1,532.91
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 173-2228
製造零件編號ASF1430
BrandSensirion
HK$2,275.564
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 +60°C 0°C +70°C 19 mA
RS庫存編號 173-2226
製造零件編號ASF1400
BrandSensirion
HK$2,226.066
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 146-2582
製造零件編號SFM3000-200
BrandSensirion
HK$786.565
Each (In a Tray of 20)
單位
Gas Flow Meter -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 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 123-7148
製造零件編號ASF1430
BrandSensirion
HK$2,386.78
單位
Air, Gas Flow Meter -400 sccm 400 sccm 7 → 18 V dc 5 mm RS-232, SPI 2bar PBT 0 °C +60°C 0°C +70°C 19 mA
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 174-9067
製造零件編號SFM3200-250
BrandSensirion
HK$1,454.78
單位
- Digital Flow Meter -100 SLPM 250 SLPM 5 V 23.5 → 26 mm JST B4B-ZR-SM4-TF 1.07bar Gold, Polyurethane, PPSU, Si, Si3N4, Stainless Steel 10 °C +50 +10°C +50°C -