Flow Sensors

Flow sensors or flow indicators are flow meter 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 (these 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 Sensor

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 a large-capacity measurement. Disadvantages are clogging and maintenance is required to cope with the axial wear otherwise the paddle needs replacing.

Variable Area Flow Sensors also known as Rotaflow meters: identified by their tapered tube and float designs. 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 flow meter. The way to select the right flow meter 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 summation?
  • Display or signal output?
  • What is the minimum and maximum flow rate, process pressure and process temperature?

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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. 186-0049
Mfr. Part No.EF7731110220
BrandParker UCC
Liquid Variable Area 1 L/min 15 L/min - 1 in 1 BSP Female 10bar PET - - +5°C +60°C -
RS Stock No. 185-9948
Mfr. Part No.EF.7731110291
BrandParker UCC
Liquid Variable Area 1 L/min 15 L/min 240 V ac 1 in 1 BSP Female 10bar PET - - +5°C +60°C -
RS Stock No. 198-0806
Mfr. Part No.FS.643 322 229
BrandParker UCC
Liquid Boxed Two-Switch 10 L/min 110 L/min 250 V ac 3/4 in - 350bar Stainless Steel - - -20°C +90°C -
RS Stock No. 198-0682
Mfr. Part No.FM.26 222 129
BrandParker UCC
Liquid Variable Area 2 L/min 20 L/min - 1/2 in 1/2 BSP - Brass - - - +90°C -
RS Stock No. 186-0055
Mfr. Part No.EF.7731112291
BrandParker UCC
Liquid Variable Area 4 L/min 50 L/min 240 V ac 1 in 1 BSP Female 10bar PET - - +5°C +60°C -
RS Stock No. 198-0705
Mfr. Part No.FM.26 322 129
BrandParker UCC
Liquid Variable Area 5 L/min 55 L/min - 3/4 in 3/4 BSP - Brass - - - +90°C -
RS Stock No. 198-0676
Mfr. Part No.FM.26 122 329
BrandParker UCC
Liquid Variable Area 1 L/min 9 L/min - 1/4 in 1/4 BSP - Brass - - - +90°C -
RS Stock No. 185-9926
Mfr. Part No.EF.7731113291
BrandParker UCC
Liquid Variable Area 5 L/min 100 L/min 240 V ac 1 in 1 BSP Female 10bar PET - - +5°C +60°C -