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. 447-4449
FabrikantRS PRO
€ 378,54
Each
Aantal stuks
Liquid Oval Gear 0.01 L/min 4 L/min 5 → 24 V dc 1/4 in 1/4 BSP 50bar Stainless Steel - - - - -
RS-stocknr. 510-0571
FabrikantRS PRO
€ 230,47
Each
Aantal stuks
Liquid Piston Inline 0.5 L/min 3 L/min 200 V ac 1/4 in 1/4 BSP 300bar Brass - +100°C - +120°C 1 A
RS-stocknr. 744-0717
FabrikantnummerPFM750S-C8-A-W
FabrikantSMC
€ 230,03
Each
Aantal stuks
Dry Air, Gas Integrated Display 1 L/min 50 L/min 24 V dc 8 mm One-Touch Fitting 750kPa PBT 0 °C +50°C 0°C +50°C -
RS-stocknr. 446-8309
Fabrikantnummer173939-C
FabrikantGems Sensors
€ 101,55
Each
Aantal stuks
Liquid Turbine 1 L/min 15 L/min 5 → 24 V dc 3/8 in 3/8 BSP 200psi Nylon 12 - - -20°C +100°C -
RS-stocknr. 361-0161
Fabrikantnummer2530A4A72BVBN
FabrikantKey Instruments
€ 226,73
Each
Aantal stuks
Gas Variable Area 14 L/min 140 L/min - 1/4 in 1/4 NPT Female 6.89bar Acrylic - +65°C - +65°C -
RS-stocknr. 901-0078
Fabrikantnummer159001110
FabrikantGeorg Fischer
€ 1.239,82
Each
Aantal stuks
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-stocknr. 508-2704
FabrikantRS PRO
€ 112,85
Each
Aantal stuks
- - - 0.05 → 10 L/min 4.5 → 24 V dc 8 mm - - - - - -25°C +125°C 8 mA
RS-stocknr. 395-6990
Fabrikantnummer166701-A
FabrikantGems Sensors
€ 44,80
Each
Aantal stuks
Gas Piston - 28 L/min 120 → 240 V ac/dc 1/4 in 1/4 BSP 10bar Noryl - +100°C - +100°C -
RS-stocknr. 198-0711
FabrikantnummerFM.26 322 229
FabrikantParker
€ 546,06
Each
Aantal stuks
Liquid Variable Area 10 L/min 110 L/min - 3/4 in 3/4 BSP - Brass - - - +90°C -
RS-stocknr. 395-7038
Fabrikantnummer166704-A
FabrikantGems Sensors
€ 44,80
Each
Aantal stuks
Gas Piston - 340 L/min 120 → 240 V ac/dc 1/4 in 1/4 BSP 10bar Noryl - +100°C - +100°C -
RS-stocknr. 901-0251
Fabrikantnummer198335426
FabrikantGeorg Fischer
€ 340,93
Each
Aantal stuks
Liquid Variable Area 60 L/h 6000 L/h - - DN40 Socket - Plastic - - - - -
RS-stocknr. 395-7224
Fabrikantnummer020-3499
FabrikantGems Sensors
€ 434,65
Each
Aantal stuks
Liquid Paddle 15 L/min 125 L/min 250 V 1 in 1 BSP 55bar Stainless Steel - - -18°C +100°C -
RS-stocknr. 804-3913
Fabrikantnummer7MF4433-1CA22-2RB1
FabrikantSiemens
€ 1.913,40
Each
Aantal stuks
Gas, Liquid, Vapour Digital Pressure Transmitter - - 9 → 24 V - 1/4 NPT 0.06bar Aluminium -40 °C +85°C -40°C +85°C -
RS-stocknr. 906-8294
Fabrikantnummer181130
FabrikantGems Sensors
€ 77,50
Each
Aantal stuks
Liquid Piston - 0.15 gal/min - 3/8 in 3/8 NPT Male 107bar Brass - - -28.8°C +135°C -
RS-stocknr. 395-6861
Fabrikantnummer155481BSPP
FabrikantGems Sensors
€ 129,80
Each
Aantal stuks
Liquid RotorFlow Electronic 15 L/min 75 L/min 4.5 → 24 V dc 1/2 in 1/2 BSP Female 6.9bar Polypropylene -29 °C +82°C -29°C +82°C -
RS-stocknr. 510-0644
FabrikantRS PRO
€ 311,56
Each
Aantal stuks
Gas, Liquid Piston Inline 5 L/min 30 L/min 250 V ac 15 mm 1/2 BSP Female 50bar Nickel Plated Brass -20 °C +90°C -20°C +70°C 1 A
RS-stocknr. 395-7202
Fabrikantnummer020-3491
FabrikantGems Sensors
€ 316,20
Each
Aantal stuks
Liquid Shuttle 7.5 L/min 30 L/min 250 V 1 in 1 BSP 27bar Bronze - - -20°C +80°C -
RS-stocknr. 613-4222
FabrikantRS PRO
€ 187,91
Each
Aantal stuks
Gas, Liquid Paddle 7.5 L/min 10 L/min 250 V ac 20 mm 3/4 BSP Female 25bar Nickel Plated Brass - +110°C - +110°C 5 A
RS-stocknr. 616-3494
Fabrikantnummer197093
FabrikantGems Sensors
€ 52,20
Each
Aantal stuks
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-stocknr. 198-2896
FabrikantnummerMR3A12BVBN
FabrikantKey Instruments
€ 72,62
Each
Aantal stuks
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 -