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. 901-0065
Mfr. Part No.159001733
$1,588.68
Each
units
- Signet Flow Integral System - - 24 V dc 0.5 → 4 in - - Polypropylene - - - - 4 → 20 mA
RS Stock No. 123-7151
Mfr. Part No.SFM4100 Air
BrandSensirion
$303.11
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. 123-7149
Mfr. Part No.SFM3000-200C
BrandSensirion
$173.80
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. 740-6449
Mfr. Part No.SU9000
$2,314.45
Each
units
Liquid Ultrasonic 0 L/min 200 L/min 19 → 30 V dc - 1-1/4 BSP 16bar Aluminium Alloy -10 °C +80°C -10°C +60°C -
RS Stock No. 198-3007
Mfr. Part No.FR2A15BVBN
$198.67
Each
units
Gas Variable Area 1 L/min 10 L/min - 1/8 in 1/8 NPT Female 6.89bar Acrylic - +65°C - +65°C -
RS Stock No. 804-3894
Mfr. Part No.7MF4433-1FA22-2RB1
BrandSiemens
$4,190.70
Each
units
Gas, Liquid, Vapour Digital Pressure Transmitter - - 9 → 24 V - 1/4 NPT 1.6bar Aluminium -40 °C +85°C -40°C +85°C -
RS Stock No. 136-6376
Mfr. Part No.74P-VQB-O-RS
BrandAtrato
$1,534.90
Each
units
Liquid Ultrasonic 0.03 L/min 5 L/min 10 → 24 V dc 1/4 in 1/4 BSP 20bar 316 Stainless Steel (Wetted) - - -20°C +65°C 20 mA
RS Stock No. 181-0607
Mfr. Part No.E8PC-YL-3
BrandOmron
$55.12
Each
units
- O-Ring - - - - G 1/4 Female - - - - -20°C +80°C -
RS Stock No. 448-7451
Mfr. Part No.MR3A17BVBN
$189.04
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 -
New
RS Stock No. 196-4457
Mfr. Part No.IFW510-F03-00-Q
BrandSMC
$339.22
Each
units
- Flow Switch 1 L/min 10 L/min - - G 0.6MPa BC6 - - +5°C +60°C -
RS Stock No. 144-9339
Mfr. Part No.85 04 73
BrandXylem
$4,139.75
Each
units
Liquid Flow Meter 0.2 m/s 10 m/s 230 V ac - DN25 - - - - -20°C +60°C -
RS Stock No. 804-4051
Mfr. Part No.7ME6520-3MC13-2AA1
BrandSiemens
$2,082.40
Each
units
Liquid Electromagnetic 0 m/s 10 m/s - 3 in DN80 16bar Carbon Steel - - -40°C +70°C -
RS Stock No. 901-0255
Mfr. Part No.198801896
$649.12
Each
units
Liquid Variable Area 15 l/h 150 L/h - Maximum of 32 mm DN25 Socket - Plastic - - - - -
New
RS Stock No. 196-4463
Mfr. Part No.PFM711-C6-E
BrandSMC
$436.44
Each
units
- Flow Switch 2 L/min 100 L/min 5 V - One Touch Fitting 750kPa Brass, LCP, PBT 0 °C +50°C 0°C +50°C 55 mA
RS Stock No. 181-0608
Mfr. Part No.E8PC-010T-E
BrandOmron
$1,067.64
Each
units
Gas, Liquid Flow Sensor -0.1 MPa 1 MPa 10 → 30 V dc G3/4 Male in M12 4 Pole Connector 1MPa Al2O3 ((alumina) Diaphragm Pressure Port), FKM (O-Ring), PBT (Button), PES (Display Unit), PPSU (Head), SUS304L (Chassis), SUS304L (Pressure Port) -20 °C +100°C -20°C +80°C 120 mA
RS Stock No. 181-0611
Mfr. Part No.E8PC-010-E
BrandOmron
$1,058.02
Each
units
Gas, Liquid Flow Sensor -0.1 MPa 1 MPa 10 → 30 V dc G3/4 Male in M12 4 Pole Connector 1MPa Al2O3 ((alumina) Diaphragm Pressure Port), FKM (O-Ring), PBT (Button), PES (Display Unit), PPSU (Head), SUS304L (Chassis), SUS304L (Pressure Port) -20 °C +100°C -20°C +80°C 120 mA
RS Stock No. 198-0660
Mfr. Part No.FM.26 122 129
BrandParker
$709.31
Each
units
Liquid Variable Area 0.2 L/min 2 L/min - 1/4 in 1/4 BSP - Brass - - - +90°C -
RS Stock No. 185-9998
Mfr. Part No.S.800003
BrandParker
$208.49
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. 144-9340
Mfr. Part No.85 04 63
BrandXylem
$4,218.92
Each
units
Liquid Flow Meter 0.2 m/s 10 m/s 230 V ac - DN45 - - - - -20°C +60°C -
RS Stock No. 725-9969
Mfr. Part No.UF08B100
BrandCynergy3
$432.92
Each
units
Liquid Sensor/Switch without Indicator 0.4 L/min 8 L/min 7.5 → 26 V dc 10 mm 3/8 Straight Tube 10bar ABS -10 °C +85°C -10°C +85°C -
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