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. 511-4772
BrandRS PRO
PHP2,857.83
Each
units
Liquid Beverage 0.6 L/min 10 L/min 4.5 24 V dc 43315 in 3/8 Push On 10bar PVDF - - 0°C +125°C 10 mA
RS Stock No. 257-133
BrandRS PRO
PHP2,663.30
Each
units
Liquid Radial Flow Turbine 1.5 L/min 30 L/min 4.5 16 V dc 15 mm - 20bar Acetal Copolymer - - -40°C +70°C 10 mA
RS Stock No. 508-2704
BrandRS PRO
PHP7,831.08
Each
units
- - - 0.05 10 L/min 4.5 24 V dc 8 mm - - - - - -25°C +125°C 8 mA
RS Stock No. 257-149
BrandRS PRO
PHP2,441.48
Each
units
Liquid Radial Flow Turbine 0.25 L/min 6.5 L/min 4.5 16 V dc 15 mm - 20bar Acetal Copolymer - - -40°C +70°C 10 mA
RS Stock No. 510-0644
BrandRS PRO
PHP17,263.07
Each
units
Gas, Liquid Piston Inline 5 L/min 30 L/min 250 V ac 15 mm 1/2 BSP Female 50bar Nickel Plated Brass -20 °C +90°C -20°C +70°C 1 A
RS Stock No. 510-0616
BrandRS PRO
PHP15,252.57
Each
units
Gas, Liquid Piston Inline 0.5 L/min 3 L/min - 8 mm 1/4 BSP Female 16bar Aluminium - +100°C - +120°C -
RS Stock No. 510-0600
BrandRS PRO
PHP15,252.57
Each
units
Gas, Liquid Piston Inline 0.1 L/min 0.6 L/min 200 V ac 8 mm 1/4 BSP Female 16bar Aluminium - +100°C - +120°C 1 A
RS Stock No. 511-3915
BrandRS PRO
PHP17,224.10
Each
units
- - - 6 100 L/min 4.5 24 V dc 3/4 in - - - - - -25°C +125°C 10 mA
RS Stock No. 511-3909
BrandRS PRO
PHP17,224.10
Each
units
- - - 2.5 30.0 L/min 4.5 24 V dc 1/2 in - - - - - -25°C +125°C 10 mA
RS Stock No. 511-3965
BrandRS PRO
PHP17,477.80
Each
units
Liquid Turbine 0.25 L/min 6.5 L/min 4.5 → 24 V dc 1/4 in 1/4 BSP 10bar Stainless Steel - - -25°C +125°C -
RS Stock No. 511-3959
BrandRS PRO
PHP17,477.80
Each
units
- - - 0.12 1.5 L/min 4.5 24 V dc 1/4 in - - - - - -25°C +125°C 10 mA
RS Stock No. 510-0622
BrandRS PRO
PHP15,252.57
Each
units
Gas, Liquid Piston Inline 1 L/min 5 L/min 200 V ac 8 mm 1/4 BSP Female 16bar Aluminium - +100°C - +120°C 1 A
RS Stock No. 511-3971
BrandRS PRO
PHP26,945.70
Each
units
Liquid Turbine 0.5 L/min 15 L/min 4.5 → 24 V dc 1/2 in 1/2 BSP 10bar Stainless Steel - - -25°C +125°C -
RS Stock No. 447-4427
BrandRS PRO
PHP23,686.45
Each
units
Liquid Oval Gear 0.01 L/min 1 L/min 5 → 24 V dc 1/4 in 1/4 BSP 50bar Stainless Steel - - - - -
RS Stock No. 447-4449
BrandRS PRO
PHP20,973.82
Each
units
Liquid Oval Gear 0.01 L/min 4 L/min 5 → 24 V dc 1/4 in 1/4 BSP 50bar Stainless Steel - - - - -
RS Stock No. 198-0660
Mfr. Part No.FM.26 122 129
BrandParker
PHP22,339.44
Each
units
Liquid Variable Area 0.2 L/min 2 L/min - 1/4 in 1/4 BSP - Brass - - - +90°C -
RS Stock No. 125-0660
Mfr. Part No.SPI-N118-1421-1-3-001
BrandSimex
PHP15,701.30
Each
units
Gas, Liquid Flow Counter - - 24 V dc - M12 - ABS, Fibreglass - - 0°C +50°C 100 mA
RS Stock No. 361-0206
Mfr. Part No.FR4L71BVBN
PHP12,512.89
Each
units
Liquid Variable Area 1.5 L/min 20 L/min - 1/4 in 1/4 NPT Female 6.89bar Acrylic - +65°C - +65°C -
RS Stock No. 914-8495
Mfr. Part No.SPP-N118-1421-1-4-001
BrandSimex
PHP14,214.67
Each
units
Fluid, Gas Flow Counter - - 85 260 V ac - Screw 25kPa ABS, Fibreglass - - 0°C +50°C 4 20 mA
RS Stock No. 906-9679
Mfr. Part No.RMA-1-SSV
PHP3,440.93
Each
units
Air Variable Area 0.05 SCFH 0.5 SCFH - 1/8 in 1/8 NPT Female 6.9bar Polycarbonate - - - +54°C -
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