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. 446-8315
Mfr. Part No.173940-C
$113.00
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. 511-4772
BrandRS PRO
$85.80
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. 740-6433
Mfr. Part No.SM8000
$1,214.55
Each
units
Liquid Magnetic-Inductive 0.2 L/min 100 L/min 19 → 30 V dc - 1 BSP 16bar PBT, Stainless Steel -20 °C +80°C -10°C +60°C -
RS Stock No. 257-133
BrandRS PRO
$63.14
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. 446-8286
Mfr. Part No.173936-C
$117.39
Each
units
Liquid Turbine 0.5 L/min 5 L/min 5 → 24 V dc 3/8 in 3/8 BSP 200psi Nylon 12 - - -20°C +100°C -
RS Stock No. 173-2223
Mfr. Part No.LG01-2000A090
BrandSensirion
$351.955
Each (In a Tray of 25)
units
Liquid Liquid Flow Switch 250 (Isopropyl Alcohol) 50 (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. 898-6731
Mfr. Part No.LG01-2000A090
BrandSensirion
$226.45
Each
units
Liquid Liquid Flow Switch 250 (Isopropyl Alcohol) 50 (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. 198-3041
Mfr. Part No.GR2-20 LPM AIR
$377.10
Each
units
Gas Variable Area 2 L/min 10 L/min - 1/8 in 1/8 NPT Female 13.7bar Borosilicate Glass - - - +93°C -
RS Stock No. 511-3971
BrandRS PRO
$750.27
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. 198-2919
Mfr. Part No.MR3A14BVBN
$158.06
Each
units
Gas Variable Area 0.4 L/min 5 L/min - 1/8 in 1/8 NPT Female 6.9bar Polycarbonate - +65°C - +65°C -
RS Stock No. 446-8292
Mfr. Part No.173037-C
$103.31
Each
units
Liquid Turbine 1 L/min 10 L/min 5 → 24 V dc 3/8 in 3/8 BSP 200psi Nylon 12 - - -20°C +100°C -
RS Stock No. 395-6827
Mfr. Part No.155420BSPP
$112.65
Each
units
Liquid RotorFlow Electronic 2 L/min 20 L/min - 1/4 in 1/4 BSP Female 6.9bar Polypropylene -29 °C +82°C -29°C +82°C -
RS Stock No. 185-9998
Mfr. Part No.S.800003
BrandParker
$187.83
Each
units
Liquid Variable Area 0.07 L/min 0.55 L/min - 1/4 in 1/4 BSP 10bar - - - - +60°C -
RS Stock No. 456-3050
Mfr. Part No.SF5350
$365.39
Each
units
Gas, Liquid Modular Flow Monitoring 3 (Liquids) ccm/s, 200 (Gases) ccm/s 300 (Liquids) cm³/s, 3000 (Gases) cm³/s - - M18 x 1.5 300bar Stainless Steel -25 (Gases) °C, -25 (Liquids) °C +80°C - - -
RS Stock No. 198-2903
Mfr. Part No.MR3A13BVBN
$153.45
Each
units
Gas Variable Area 0.1 L/min 1.2 L/min - 1/8 in 1/8 NPT Female 6.9bar Polycarbonate - +65°C - +65°C -
RS Stock No. 395-6849
Mfr. Part No.142541BSPP
$142.95
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. 448-7451
Mfr. Part No.MR3A17BLBN
$161.57
Each
units
Gas Variable Area 4 L/min 50 L/min - 1/8 in 1/8 NPT Female 6.9bar Polycarbonate - +65°C - +65°C -
RS Stock No. 395-184
Mfr. Part No.AWM5101VN
BrandHoneywell
$385.38
Each
units
Dry Gas Amplified 0 sLpm 5 SLPM 15 V dc - 1/4 NPT 50psi Plastic - - 0°C +50°C -
RS Stock No. 198-2896
Mfr. Part No.MR3A12BVBN
$203.18
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 -
RS Stock No. 256-281
Mfr. Part No.S.800001
BrandParker
$212.65
Each
units
Liquid Variable Area 0.2 L/min 2 L/min - 3/4 in 3/4 BSP 10bar - - - - +60°C -
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