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. 257-149
BrandRS PRO
€42.79
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. 511-4772
BrandRS PRO
€47.05
Each
units
Liquid Flow Meter 0.6 L/min 10 L/min 4.5 → 24 V dc 3/8 in 3/8 Push On 10bar PVDF - - 0°C +125°C 10 mA
RS Stock No. 508-2704
BrandRS PRO
€113.53
Each
units
- - - 0.05 → 10 L/min 4.5 → 24 V dc 8 mm - - - - - -25°C +125°C 8 mA
RS Stock No. 511-3965
BrandRS PRO
€306.26
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. 257-133
BrandRS PRO
€42.79
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. 447-4449
BrandRS PRO
€367.51
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. 510-0644
BrandRS PRO
€302.49
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. 447-4427
BrandRS PRO
€398.00
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. 511-3959
BrandRS PRO
€306.26
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. 510-0600
BrandRS PRO
€267.25
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. 511-3909
BrandRS PRO
€301.81
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. 510-0616
BrandRS PRO
€267.25
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. 511-3915
BrandRS PRO
€301.81
Each
units
- - - 6 → 100 L/min 4.5 → 24 V dc 3/4 in - - - - - -25°C +125°C 10 mA
RS Stock No. 511-3971
BrandRS PRO
€472.16
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. 510-0622
BrandRS PRO
€267.25
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. 446-8315
Mfr. Part No.173940-C
€101.55
Each
units
Liquid Turbine 2 L/min 30 L/min 5 → 24 V dc 3/8 in 3/8 BSP 200psi Nylon 12 - - -20°C +100°C -
RS Stock No. 906-7765
Mfr. Part No.VFA-3
€39.96
Each
units
Air Variable Area 0.6 SCFH 5 SCFH - 1/8 in 1/8 NPT Female 10 (Without Valve) bar, 6.9 (With Valve) bar Acrylic Plastic - +38 (Without Valve) °C, +48 (With Valve) °C - - -
RS Stock No. 123-7151
Mfr. Part No.SFM4100 Air
BrandSensirion
€153.97
Each
units
Gas Digital Mass 0 slm 20 slm 3.5 → 9 V 15.35 mm 2-Wire I2C 6 bar, 10 (Over Pressure) bar Aluminium (Coated), Epoxy, Gold, Nickel Plated Brass, Nitrile, Nylon, Oxygenoex, Pa-12, Si, Si3n4, Siox, Stainless Steel, Viton® 0 °C +50°C -20°C +80°C <12.5 mA
RS Stock No. 740-6424
Mfr. Part No.SM7000
€635.90
Each
units
Liquid Magnetic-Inductive 0.2 L/min 50 L/min 19 → 30 V dc - 3/4 BSP 16bar PBT, Stainless Steel -20 °C +80°C -10°C +60°C -
RS Stock No. 198-2896
Mfr. Part No.MR3A12BVBN
€102.18
Each
units
Gas Variable Area 0.05 L/min 0.5 L/min - 1/8 in 1/8 NPT Female 6.9bar Polycarbonate - +65°C - +65°C -
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