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 Stock No. 804-3907
Mfr. Part No.7MF4433-1DA22-2RB1
BrandSiemens
$2,765.72
Each
units
Gas, Liquid, Vapour Digital Pressure Transmitter - - 9 → 24 V - 1/4 NPT 0.25bar Aluminium -40 °C +85°C -40°C +85°C -
New
RS Stock No. 187-9059
Mfr. Part No.071-06402
$207.50
Each
units
Air Air Bubble Detector - - 5 → 24 V dc - - - ABS/PC Plastic - - 0°C +40°C -
RS Stock No. 144-9339
Mfr. Part No.85 04 73
BrandXylem
$4,139.75
Each
units
Liquid Flow Meter 0.2 m/s 10 m/s 230 V ac - DN25 - - - - -20°C +60°C -
RS Stock No. 448-7467
Mfr. Part No.MR3A18BVBN
$177.72
Each
units
Gas Variable Area 10 L/min 100 L/min - 1/8 in 1/8 NPT Female 6.9bar Polycarbonate - +65°C - +65°C -
RS Stock No. 361-0234
Mfr. Part No.FR5L61PI
$402.89
Each
units
Liquid Variable Area 5 L/min 75 L/min - 1 in 1 NPT Female 6.89bar Acrylic - +65°C - +65°C -
RS Stock No. 804-3913
Mfr. Part No.7MF4433-1CA22-2RB1
BrandSiemens
$2,917.10
Each
units
Gas, Liquid, Vapour Digital Pressure Transmitter - - 9 → 24 V - 1/4 NPT 0.06bar Aluminium -40 °C +85°C -40°C +85°C -
RS Stock No. 181-0611
Mfr. Part No.E8PC-010-E
BrandOmron
$1,058.02
Each
units
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 Stock No. 198-0698
Mfr. Part No.FM.26 222 229
BrandParker
$941.95
Each
units
Liquid Variable Area 5 L/min 46 L/min - 1/2 in 1/2 BSP - Brass - - - +90°C -
RS Stock No. 181-0603
Mfr. Part No.E8PC-YS-N
BrandOmron
$54.57
Each
units
- Throttle - - - - M6 x 0.75 - SUS304 - - -20°C +80°C -
RS Stock No. 804-3998
Mfr. Part No.7ME6340-3TC13-2AA1
BrandSiemens
$2,594.78
Each
units
Liquid Electromagnetic 0 m/s 10 m/s - 0.5 → 12 in 1/2 NPT 40bar Carbon Steel - - -40°C +100°C -
RS Stock No. 901-0223
Mfr. Part No.198803321
$344.66
Each
units
Liquid Variable Area 5 l/h 50 L/h - Maximum of 16 mm DN10 Socket - Plastic - - - - -
RS Stock No. 185-9998
Mfr. Part No.S.800003
BrandParker
$206.62
Each
units
Liquid Variable Area 0.07 L/min 0.55 L/min - 1/4 in 1/4 BSP 10bar - - - - +60°C -
RS Stock No. 901-0233
Mfr. Part No.198803329
$427.11
Each
units
Liquid Variable Area 100 l/h 1000 L/h - Maximum of 32 mm DN25 Socket - Plastic - - - - -
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