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. 901-0233
Mfr. Part No.198803329
$388.28
Each
units
Liquid Variable Area 100 l/h 1000 L/h - Maximum of 32 mm DN25 Socket - Plastic - - - - -
RS Stock No. 901-0078
Mfr. Part No.159001110
$1,376.62
Each
units
Liquid Magmeter 0.05 m/s 10 m/s 24 V dc 1/2 → 4 in DN15 to DN 100 Socket 10.3bar Polypropylene, Stainless Steel 0 °C +85°C -10°C +70°C 4 → 20 mA
RS Stock No. 901-0069
Mfr. Part No.198840143
$771.62
Each
units
Liquid Paddlewheel 0.1 m/s 6 m/s 5 → 24 V dc 0.5 → 4.0 in DN15 to DN 100 Socket 12.5bar Polypropylene - - -18°C +85°C <1.5 mA @ 3.3 → 6 V dc, <20 mA @ 6 → 24 V dc
RS Stock No. 901-0264
Mfr. Part No.198801898
$517.49
Each
units
Liquid Variable Area 50 l/h 500 L/h - Maximum of 32 mm DN25 Socket - Plastic - - - - -
RS Stock No. 901-0239
Mfr. Part No.198807008
$280.68
Each
units
Liquid Variable Area 500 l/h 500 L/h - - DN25 Socket - Plastic - - - - -
RS Stock No. 901-0071
Mfr. Part No.159001296
$1,018.79
Each
units
- Paddlewheel - - - - - - - - - - - -
RS Stock No. 901-0249
Mfr. Part No.198807001
$223.55
Each
units
Liquid Variable Area 50 l/h 50 L/h - - DN10 Socket - Plastic - - - - -
RS Stock No. 901-0227
Mfr. Part No.198807011
$363.01
Each
units
Liquid Variable Area 5 l/h 50 L/h - - DN10 Socket - Plastic - - - - -
RS Stock No. 901-0223
Mfr. Part No.198803321
$313.32
Each
units
Liquid Variable Area 5 l/h 50 L/h - Maximum of 16 mm DN10 Socket - Plastic - - - - -
RS Stock No. 901-0065
Mfr. Part No.159001733
$1,444.25
Each
units
- Signet Flow Integral System - - 24 V dc 0.5 → 4 in - - Polypropylene - - - - 4 → 20 mA
RS Stock No. 901-0236
Mfr. Part No.199335425
$494.00
Each
units
Liquid Variable Area 300 l/h 3000 L/h - - DN40 Socket - Plastic - - - - -
RS Stock No. 901-0255
Mfr. Part No.198801896
$517.49
Each
units
Liquid Variable Area 15 l/h 150 L/h - Maximum of 32 mm DN25 Socket - Plastic - - - - -
RS Stock No. 901-0245
Mfr. Part No.198807811
$313.32
Each
units
- Variable Area - - - - - - - - - - - -
RS Stock No. 901-0251
Mfr. Part No.198335426
$494.00
Each
units
Liquid Variable Area 60 l/h 6000 L/h - - DN40 Socket - Plastic - - - - -
RS Stock No. 901-0258
Mfr. Part No.198807005
$241.92
Each
units
Liquid Variable Area 20 l/h 200 L/h - - DN25 Socket - Plastic - - - - -