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. 123-7149
Mfr. Part No.SFM3000-200C
BrandSensirion
SGD150.70
Each
units
Gas Low Pressure Drop -200 slm 200 slm 5 V 22 mm 2-Wire I2C 1.3bar Epoxy, Gold, Polyurethane, PPE+PS Blend, Si, Si3n4, Siox, Stainless Steel (Annealed) -20 °C +80°C -20°C +80°C -
RS Stock No. 446-8315
Mfr. Part No.173940-C
SGD144.68
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. 898-6738
Mfr. Part No.LG01-2000A005
BrandSensirion
SGD245.94
Each
units
Liquid Liquid Flow Switch 250 (Isopropyl Alcohol) 220 (Water) ml/min, 250 (Isopropyl Alcohol) ml/min 5 → 12 V 9.2 mm 5 Pin PCB Header 3bar Borosilicate Glass (Tube Material), FEP (Sealing), PEEk (Fitting) - - +10°C +50°C 6.8 mA
RS Stock No. 623-7927
Mfr. Part No.AWM43300V
BrandHoneywell
SGD193.35
Each
units
Dry Gas Amplified - 1000 cm³/s 15 V dc 0.246 in - 150psi Plastic - - -25°C +85°C -
RS Stock No. 173-2224
Mfr. Part No.LG01-2000A005
BrandSensirion
SGD215.20
Each (In a Tray of 25)
units
Liquid Liquid Flow Switch 250 (Isopropyl Alcohol) 220 (Water) ml/min, 250 (Isopropyl Alcohol) ml/min 5 → 12 V 9.2 mm 5 Pin PCB Header 3bar Borosilicate Glass (Tube Material), FEP (Sealing), PEEk (Fitting) - - +10°C +50°C 6.8 mA
RS Stock No. 395-6861
Mfr. Part No.155481BSPP
SGD200.21
Each
units
Liquid RotorFlow Electronic 15 L/min 75 L/min 4.5 → 24 V dc 1/2 in 1/2 BSP Female 6.9bar Polypropylene -29 °C +82°C -29°C +82°C -
RS Stock No. 907-3959
Mfr. Part No.155420
SGD122.92
Each
units
Fluid, Liquid RotorFlow 0.1 gal/min 5 gal/min - 1/4 in 1/4 NPT Female 6.9bar Polypropylene - +21°C -29°C +82°C -
RS Stock No. 906-7790
Mfr. Part No.VFB-52
SGD100.08
Each
units
Air Variable Area 4 SCFH 40 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. 395-6855
Mfr. Part No.155421BSPP
SGD200.21
Each
units
Liquid RotorFlow Electronic 2 L/min 20 L/min 4.5 → 24 V dc 1/4 in 1/4 BSP Female 6.9bar Polypropylene -29 °C +82°C -29°C +82°C -
RS Stock No. 901-0251
Mfr. Part No.198335426
SGD528.47
Each
units
Liquid Variable Area 60 l/h 6000 L/h - - DN40 Socket - Plastic - - - - -
RS Stock No. 395-213
Mfr. Part No.AWM5104VN
BrandHoneywell
SGD252.87
Each
units
Dry Gas Amplified 0 sLpm 20 SLPM 15 V dc - 1/4 NPT 50psi Plastic - - 0°C +50°C -
RS Stock No. 906-7762
Mfr. Part No.VFA-34-BV
SGD75.14
Each
units
Liquid Variable Area 20 CC/min 200 CC/min - 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. 286-298
Mfr. Part No.EF.7731114291
BrandParker
SGD587.12
Each
units
Liquid Variable Area 10 L/min 150 L/min 240 V ac 1 in 1 BSP Female 10bar PET - - +5°C +60°C -
RS Stock No. 804-4036
Mfr. Part No.7ME6520-4HC13-2AA1
BrandSiemens
SGD2,390.08
Each
units
Liquid Electromagnetic 0 m/s 10 m/s - 6 in 1/2 NPT 16bar Carbon Steel - - -40°C +70°C -
RS Stock No. 198-2896
Mfr. Part No.MR3A12BVBN
SGD170.67
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 -
RS Stock No. 198-0660
Mfr. Part No.FM.26 122 129
BrandParker
SGD603.40
Each
units
Liquid Variable Area 0.2 L/min 2 L/min - 1/4 in 1/4 BSP - Brass - - - +90°C -
RS Stock No. 446-8309
Mfr. Part No.173939-C
SGD144.68
Each
units
Liquid Turbine 1 L/min 15 L/min 5 → 24 V dc 3/8 in 3/8 BSP 200psi Nylon 12 - - -20°C +100°C -
RS Stock No. 198-2981
Mfr. Part No.FR2A13BVBN
SGD149.46
Each
units
Gas Variable Area 0.1 L/min 1 L/min - 1/8 in 1/8 NPT Female 6.89bar Acrylic - +65°C - +65°C -
RS Stock No. 395-6849
Mfr. Part No.142541BSPP
SGD188.25
Each
units
Liquid RotorFlow 2 L/min 20 L/min - 1/4 in 1/4 BSP Female 13.8bar Brass - - -29°C +100°C -
RS Stock No. 906-9720
Mfr. Part No.RMB-55-SSV
SGD115.98
Each
units
Air Variable Area 40 SCFH 400 SCFH - 1/4 in 1/4 NPT Female 6.9bar Polycarbonate - - - +54°C -
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