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. 361-0256
Mfr. Part No.FR5A53PI
$431.20
Each
units
Gas Variable Area 100 L/min 700 L/min - 1 in 1 NPT Female 6.89bar Acrylic - +65°C - +65°C -
RS Stock No. 361-0177
Mfr. Part No.NL4A70BVBN
$450.58
Each
units
Gas Variable Area 30 L/min 280 L/min - 1/4 in 1/4 NPT Female 6.89bar Acrylic - +65°C - +65°C -
RS Stock No. 616-3494
Mfr. Part No.197093
$58.88
Each
units
Liquid Piston - 1 gal/min 200 V 1/4 in 1/4 Quick Disconnect Male 8.6bar Glass Reinforced PP -18 °C +100°C -18°C +100°C -
RS Stock No. 901-0078
Mfr. Part No.159001110
$1,514.28
Each
units
Liquid Magmeter 0.05 m/s 10 m/s 24 V dc 1/2 → 4 in DN15 to DN 100 Socket 10.3bar Polypropylene, Stainless Steel 0 °C +85°C -10°C +70°C 4 → 20 mA
RS Stock No. 123-7147
Mfr. Part No.ASF1400
BrandSensirion
$477.07
Each
units
Air, Gas Flow Meter -400 sccm 400 sccm 7 → 18 V dc 5 mm RS-232, SPI 2bar PBT 0 °C +70°C 0°C +70°C 20 mA
RS Stock No. 361-0212
Mfr. Part No.FR5L59PI
$402.89
Each
units
Liquid Variable Area 1 L/min 19 L/min - 1 in 1 NPT Female 6.89bar Acrylic - +65°C - +65°C -
RS Stock No. 448-7445
Mfr. Part No.MR3A16BVBN
$174.36
Each
units
Gas Variable Area 2 L/min 30 L/min - 1/8 in 1/8 NPT Female 6.9bar Polycarbonate - +65°C - +65°C -
RS Stock No. 173-2226
Mfr. Part No.ASF1400
BrandSensirion
$432.35
Each (In a Box of 10)
units
Air, Gas Flow Meter -400 sccm 400 sccm 7 → 18 V dc 5 mm RS-232, SPI 2bar PBT 0 °C +70°C 0°C +70°C 20 mA
RS Stock No. 395-6934
Mfr. Part No.156268BSPP
$401.89
Each
units
Liquid RotorFlow Electronic 15 L/min 75 L/min 24 V dc 1/2 in 1/4 BSP Female 13.8bar Brass -29 °C +100°C -29°C +100°C -
RS Stock No. 740-6436
Mfr. Part No.SU7000
$1,420.68
Each
units
Liquid Ultrasonic 0 L/min 50 L/min 19 → 30 V dc - 3/4 BSP 16bar Aluminium Alloy -10 °C +80°C -10°C +60°C -
RS Stock No. 123-7149
Mfr. Part No.SFM3000-200C
BrandSensirion
$175.96
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. 616-3466
Mfr. Part No.216446
$60.51
Each
units
Liquid Piston - 0.07 gal/min 200 V 1/4 in 1/4 Quick Disconnect Male 8.6bar Glass Reinforced PP -18 °C +100°C -18°C +100°C -
RS Stock No. 361-0262
Mfr. Part No.FR5A54PI
$435.72
Each
units
Gas Variable Area 100 L/min 1400 L/min - 1 in 1 NPT Female 6.89bar Acrylic - +65°C - +65°C -
RS Stock No. 198-3041
Mfr. Part No.GR2-20 LPM AIR
$414.81
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. 407-574
Mfr. Part No.AWM3100V
BrandHoneywell
$261.63
Each
units
Dry Gas Amplified -200 sccm 200 cm³/min 15 V dc 0.2 in - 25psi Plastic - - -25°C +85°C -
RS Stock No. 198-2981
Mfr. Part No.FR2A13BVBN
$192.58
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. 901-0236
Mfr. Part No.199335425
$543.40
Each
units
Liquid Variable Area 300 l/h 3000 L/h - - DN40 Socket - Plastic - - - - -
RS Stock No. 901-0249
Mfr. Part No.198807001
$245.91
Each
units
Liquid Variable Area 50 l/h 50 L/h - - DN10 Socket - Plastic - - - - -
RS Stock No. 198-0705
Mfr. Part No.FM.26 322 129
BrandParker UCC
$631.60
Each
units
Liquid Variable Area 5 L/min 55 L/min - 3/4 in 3/4 BSP - Brass - - - +90°C -
RS Stock No. 901-0239
Mfr. Part No.198807008
$308.75
Each
units
Liquid Variable Area 500 l/h 500 L/h - - DN25 Socket - Plastic - - - - -
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