Flow Sensors

Flow sensors or flow indicators are flow meter 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 (these 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 Sensor

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 a large-capacity measurement. Disadvantages are clogging and maintenance is required to cope with the axial wear otherwise the paddle needs replacing.

Variable Area Flow Sensors also known as Rotaflow meters: identified by their tapered tube and float designs. 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 flow meter. The way to select the right flow meter 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 summation?
  • Display or signal output?
  • What is the minimum and maximum flow rate, process pressure and process temperature?

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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. 313-2481
Mfr. Part No.FCS-GL1/2A4-NA-H1141
BrandTurck
$980.70
Each
units
Gas, Liquid Remote Sensor 1 (Water) ccm/s, 2 (Air) ccm/s, 3 (Oil) ccm/s 30 (Air) cm³/s, 150 (Water) cm³/s, 300 (Oil) cm³/s - 1/2 in 1/2 BSP 100bar Stainless Steel -25 °C +80°C -25°C +80°C -
RS Stock No. 186-0011
Mfr. Part No.EF.7731112290
BrandParker
$439.26
Each
units
Liquid Variable Area 4 L/min 50 L/min - 1 in 1 BSP Female 10bar PET - - +5°C +60°C -
RS Stock No. 198-2953
Mfr. Part No.MR3L10BVBN
$169.25
Each
units
Liquid Variable Area 5 ccm 110 cm³/min - 1/8 in 1/8 NPT Female 6.9bar Polycarbonate - +65°C - +65°C -
New
RS Stock No. 213-3259
Mfr. Part No.FFUS20-1G1IO
BrandSick
$1,496.33
Each
units
- Flow Meter 3.5 l/min 60 L/min 18 → 30 V dc 20 mm G1 Male 10bar PPSU 0 °C +80°C 0°C +60°C 100 mA
RS Stock No. 196-4458
Mfr. Part No.PF2A721-F03-27N
BrandSMC
$973.36
Each
units
- Flow Switch 20 L/min 200 L/min 12 → 24 V dc - G 0.75MPa PBT - - 0°C +50°C -
RS Stock No. 198-3007
Mfr. Part No.25102A15BVBN
$193.60
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. 201-7955
Mfr. Part No.HAFUHH0020L4AXT
BrandHoneywell
$288.44
Each
units
Air, Gas Digital 0 l/min 20 L/min 3 → 10 V dc - - - - - - - - -
RS Stock No. 186-0049
Mfr. Part No.EF7731110220
BrandParker UCC
$487.86
Each
units
Liquid Variable Area 1 L/min 15 L/min - 1 in 1 BSP Female 10bar PET - - +5°C +60°C -
RS Stock No. 201-7957
Mfr. Part No.HAFUHH0200L4AXT
BrandHoneywell
$288.44
Each
units
Air, Gas Digital 0 l/min 200 L/min 3 → 10 V dc - - - - - - - - -
RS Stock No. 198-2896
Mfr. Part No.MR3A12BVBN
$232.69
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. 196-4459
Mfr. Part No.PF2D504-11-2
BrandSMC
$1,547.02
Each
units
- Flow Switch 0.4 L/min 4 L/min 12 → 24 V dc - One Touch Fitting 1MPa PFA 0 °C +90°C 0°C +50°C 20 mA
New
RS Stock No. 217-3743
Mfr. Part No.FS2012-1020-NG
$118.668
Each (In a Tray of 10)
units
- - - - - - - - - - - - - -
RS Stock No. 204-3916
Mfr. Part No.D6F-01N2-000
BrandOmron
$471.40
Each
units
Gas Gas 1 l/min 1 L/min 26.4 V dc - - - - - - - - -
RS Stock No. 172-2358
Mfr. Part No.MFS02.PEXP.0
$146.341
Each (In a Tray of 50)
units
- - - - - - - - - - - -40°C +80°C -
RS Stock No. 196-9687
Mfr. Part No.159001805
$3,540.92
Each
units
- Flow Sensors & Indicators - - - - - - - - - - - -
RS Stock No. 780-0122
Mfr. Part No.LFS-03
BrandCynergy3
$468.05
Each
units
- Paddle 15.2 L/min, 19 L/min 60.6 L/min, 83.3 L/min 230 V 1 → 3 in 1 NPT 20bar Aluminium Alloy - - -30°C +150°C 1 A
RS Stock No. 804-3926
Mfr. Part No.7MF4997-1BE
BrandSiemens
$277.97
Each
units
- Cover with Window - - - - - - Die-Cast Aluminium - - - - -
RS Stock No. 201-7958
Mfr. Part No.HAFUHM0010L4AXT
BrandHoneywell
$243.73
Each
units
Air, Gas Digital 0 l/min 10 L/min 3 → 10 V dc - - - - - - - - -
RS Stock No. 198-2969
Mfr. Part No.MR3L11BVBN
$161.11
Each
units
Liquid Variable Area 20 ccm 300 cm³/min - 1/8 in 1/8 NPT Female 6.9bar Polycarbonate - +65°C - +65°C -
RS Stock No. 725-9965
Mfr. Part No.UF25B100
BrandCynergy3
$537.08
Each
units
Liquid Sensor/Switch without Indicator 0.5 L/min 25 L/min 7.5 → 26 V dc 10 mm 3/8 BSP 10bar ABS -10 °C +85°C -10°C +85°C -