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. 198-3041
Mfr. Part No.GR2-20 LPM AIR
SGD393.97
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. 185-9998
Mfr. Part No.S.800003
BrandParker
SGD174.62
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. 198-2903
Mfr. Part No.MR3A13BVBN
SGD135.34
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. 125-0660
Mfr. Part No.SPI-N118-1421-1-3-001
BrandSimex
SGD420.98
Each
units
Gas, Liquid Flow Counter - - 24 V dc - M12 - ABS, Fibreglass - - 0°C +50°C 100 mA
RS Stock No. 361-0212
Mfr. Part No.FR5L59PI
SGD484.78
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. 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 -
RS Stock No. 740-6424
Mfr. Part No.SM7000
SGD991.62
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. 906-9708
Mfr. Part No.RMA-7-SSV
SGD89.98
Each
units
Air Variable Area 5 SCFH 50 SCFH - 1/8 in 1/8 NPT Female 6.9bar Polycarbonate - - - +54°C -
RS Stock No. 198-2975
Mfr. Part No.FR2A12BVBN
SGD142.22
Each
units
Gas, Liquid Variable Area 0.04 L/min 0.5 L/min - 1/8 in 1/8 NPT Female 7bar Acrylic - +65°C - +65°C -
RS Stock No. 740-6436
Mfr. Part No.SU7000
SGD1,144.08
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. 849-9439
Mfr. Part No.PFMV505-1
BrandSMC
SGD261.63
Each
units
Dry Air, Gas Suction 0 L/min 0.5 L/min 12 → 24 V dc 4 mm One-Touch Fitting 500kPa PPS 0 °C +50°C 0°C +50°C -
RS Stock No. 123-7151
Mfr. Part No.SFM4100 Air
BrandSensirion
SGD262.82
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. 256-281
Mfr. Part No.S.800001
BrandParker
SGD167.89
Each
units
Liquid Variable Area 0.2 L/min 2 L/min - 3/4 in 3/4 BSP 10bar - - - - +60°C -
RS Stock No. 906-7768
Mfr. Part No.VFA-34
SGD57.18
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. 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. 198-0806
Mfr. Part No.FS.643 322 229
BrandParker UCC
SGD1,396.25
Each
units
Liquid Boxed Two-Switch 10 L/min 110 L/min 250 V ac 3/4 in - 350bar Stainless Steel - - -20°C +90°C -
RS Stock No. 740-6430
Mfr. Part No.SU8000
SGD1,190.91
Each
units
Liquid Ultrasonic 0 L/min 100 L/min 19 → 30 V dc - 1 BSP 16bar Aluminium Alloy -10 °C +80°C -10°C +60°C -
RS Stock No. 361-0278
Mfr. Part No.FR5A55PI
SGD484.78
Each
units
Gas Variable Area 400 L/min 4000 L/min - 1 in 1 NPT Female 6.89bar Acrylic - +65°C - +65°C -
RS Stock No. 395-6928
Mfr. Part No.156265BSPP
SGD425.61
Each
units
Liquid RotorFlow Electronic 2 L/min 20 L/min 24 V dc - 1/4 BSP Female 14bar Brass -29 °C +100°C -29°C +100°C -
RS Stock No. 901-0249
Mfr. Part No.198807001
SGD214.47
Each
units
Liquid Variable Area 50 l/h 50 L/h - - DN10 Socket - Plastic - - - - -
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