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 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 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 804-3926
製造零件編號7MF4997-1BE
BrandSiemens
HK$1,099.48
單位
- Cover with Window - - - - - - Die-Cast Aluminium - - - - -
RS庫存編號 901-0249
製造零件編號198807001
HK$1,310.27
單位
Liquid Variable Area 50 l/h 50 L/h - - DN10 Socket - Plastic - - - - -
RS庫存編號 907-3947
製造零件編號142541
HK$1,521.42
單位
Fluid, Liquid RotorFlow 0.1 gal/min 5 gal/min - 1/4 in 1/4 NPT Female 13.8bar Brass - +21°C -29°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 181-0611
製造零件編號E8PC-010-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 849-9436
製造零件編號PFMV530-1
BrandSMC
HK$1,380.61
單位
Dry Air, Gas Suction 0 L/min 3 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 907-4003
製造零件編號173931-C
HK$1,206.66
單位
Liquid Turbine 0.5 l/min 5 L/min 5 → 24 V dc 3/8 in 3/8 NPT Male 13.7bar Nylon 12 - - -20°C +100°C 8 mA
RS庫存編號 186-0011
製造零件編號EF.7731112290
BrandParker
HK$1,442.63
單位
Liquid Variable Area 4 L/min 50 L/min - 1 in 1 BSP Female 10bar PET - - +5°C +60°C -