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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Omschrijving Prijs 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-stocknr. 407-596
FabrikantnummerAWM3300V
FabrikantHoneywell
€ 116,36
Each
Aantal stuks
Dry Gas Amplified -1000 sccm 1000 cm³/min 15 V dc 0.2 in - 25psi Plastic - - -25°C +85°C -
RS-stocknr. 198-2969
FabrikantnummerMR3L11BVBN
FabrikantKey Instruments
€ 72,26
Each
Aantal stuks
Liquid Variable Area 20 ccm 300 cm³/min - 1/8 in 1/8 NPT Female 6.9bar Polycarbonate - +65°C - +65°C -
RS-stocknr. 616-2693
Fabrikantnummer212460E
FabrikantGems Sensors
€ 77,25
Each
Aantal stuks
Liquid Turbine 0.026 gal/min 0.65 gal/min 5 → 24 V dc 1/4 in 1/4 BSP Male 24bar Nylon 12 - - -20°C +100°C -
RS-stocknr. 257-133
FabrikantRS PRO
€ 46,77
Each
Aantal stuks
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-stocknr. 198-3007
Fabrikantnummer25102A15BVBN
FabrikantKey Instruments
€ 92,65
Each
Aantal stuks
Gas Variable Area 1 L/min 10 L/min - 1/8 in 1/8 NPT Female 6.89bar Acrylic - +65°C - +65°C -
RS-stocknr. 744-0701
FabrikantnummerPFM710S-C4-B-W
FabrikantSMC
€ 232,07
Each
Aantal stuks
Dry Air, Gas Integrated Display 0.2 L/min 10 L/min 24 V dc 4 mm One-Touch Fitting 750kPa PBT 0 °C +50°C 0°C +50°C -
RS-stocknr. 740-6433
FabrikantnummerSM8000
Fabrikantifm electronic
€ 635,21
Each
Aantal stuks
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-stocknr. 395-6962
Fabrikantnummer166702
FabrikantGems Sensors
€ 44,80
Each
Aantal stuks
Liquid Piston - 1 L/min 120 → 240 V ac/dc 1/4 in 1/4 BSP 10bar Noryl - +100°C - +100°C -
RS-stocknr. 907-3959
Fabrikantnummer155420
FabrikantGems Sensors
€ 64,52
Each
Aantal stuks
Fluid, Liquid RotorFlow 0.1 gal/min 5 gal/min - 1/4 in 1/4 NPT Female 6.9bar Polypropylene - +21°C -29°C +82°C -
RS-stocknr. 740-6449
FabrikantnummerSU9000
Fabrikantifm electronic
€ 1.022,60
Each
Aantal stuks
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-stocknr. 623-7933
FabrikantnummerAWM720P1
FabrikantHoneywell
€ 140,69
Each
Aantal stuks
Dry Gas Compensated/Amplified - 200 SLPM 15 V dc 22 mm 4-Pin 25psi Plastic - - -25°C +85°C -
RS-stocknr. 907-4057
Fabrikantnummer212465
FabrikantGems Sensors
€ 63,04
Each
Aantal stuks
Liquid Turbine 0.1 l/min 2.5 L/min 5 → 24 V dc 1/4 in 1/4 NPT Female 24bar Nylon 12 - - -20°C +100°C -
RS-stocknr. 448-7467
FabrikantnummerMR3A18BVBN
FabrikantKey Instruments
€ 60,77
Each
Aantal stuks
Gas Variable Area 10 L/min 100 L/min - 1/8 in 1/8 NPT Female 6.9bar Polycarbonate - +65°C - +65°C -
RS-stocknr. 198-2903
FabrikantnummerMR3A13BVBN
FabrikantKey Instruments
€ 72,62
Each
Aantal stuks
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-stocknr. 198-2953
FabrikantnummerMR3L10BVBN
FabrikantKey Instruments
€ 72,62
Each
Aantal stuks
Liquid Variable Area 5 ccm 110 cm³/min - 1/8 in 1/8 NPT Female 6.9bar Polycarbonate - +65°C - +65°C -
RS-stocknr. 198-2981
Fabrikantnummer25102A13BVBN
FabrikantKey Instruments
€ 89,52
Each
Aantal stuks
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-stocknr. 446-8286
Fabrikantnummer173936-C
FabrikantGems Sensors
€ 101,55
Each
Aantal stuks
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-stocknr. 907-3928
Fabrikantnummer70824
FabrikantGems Sensors
€ 106,80
Each
Aantal stuks
Liquid Piston - 1 gal/min - 1/4 in 1/4 NPT Female 69bar Brass - - -29°C +93.3°C -
RS-stocknr. 198-2997
Fabrikantnummer25102A14BVBN
FabrikantKey Instruments
€ 92,65
Each
Aantal stuks
Gas Variable Area 0.4 L/min 5 L/min - 1/8 in 1/8 NPT Female 6.89bar Acrylic - +65°C - +65°C -
RS-stocknr. 511-3965
FabrikantRS PRO
€ 315,45
Each
Aantal stuks
Liquid Turbine 0.25 L/min 6.5 L/min 4.5 → 24 V dc 1/4 in 1/4 BSP 10bar Stainless Steel - - -25°C +125°C -