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. 446-8309
Mfr. Part No.173939-C
£70.10
Each
Units
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 Stock No. 616-2693
Mfr. Part No.212460E
£51.00
Each
Units
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 Stock No. 446-8292
Mfr. Part No.173037-C
£70.10
Each
Units
Liquid Turbine 1 L/min 10 L/min 5 → 24 V dc 3/8 in 3/8 BSP 200psi Nylon 12 - - -20°C +100°C -
RS Stock No. 407-596
Mfr. Part No.AWM3300V
BrandHoneywell
£102.67
Each
Units
Dry Gas Amplified -1000 sccm 1000 cm³/min 15 V dc 0.2 in - 25psi Plastic - - -25°C +85°C -
RS Stock No. 780-0273
Mfr. Part No.FSP10A30
BrandCynergy3
£85.05
Each
Units
Liquid In-line - 80 L/min 250 V ac G1 1 BSP 8bar Brass/Polyamide - +85°C - +85°C 10 A
RS Stock No. 395-6833
Mfr. Part No.155480BSPP
£59.00
Each
Units
Liquid RotorFlow 15 L/min 75 L/min - 1/2 in 1/2 BSP Female 6.9bar Polypropylene -29 °C +82°C -29°C +82°C -
RS Stock No. 744-0714
Mfr. Part No.PFM725S-C6-B-W
BrandSMC
£208.20
Each
Units
Dry Air, Gas Integrated Display 0.5 L/min 25 L/min 24 V dc 6 mm One-Touch Fitting 750kPa PBT 0 °C +50°C 0°C +50°C -
RS Stock No. 198-2931
Mfr. Part No.MR3A15BVBN
£68.89
Each
Units
Gas Variable Area 1 L/min 10 L/min - 1/8 in 1/8 NPT Female 6.9bar Polycarbonate - +65°C - +65°C -
RS Stock No. 395-6978
Mfr. Part No.166703
£35.80
Each
Units
Liquid Piston - 2 L/min 120 → 240 V ac/dc 1/4 in 1/4 BSP 10bar Noryl - +100°C - +100°C -
RS Stock No. 448-7451
Mfr. Part No.MR3A17BVBN
£69.75
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 -
RS Stock No. 441-4879
Mfr. Part No.S.800004
BrandParker
£85.45
Each
Units
Liquid Variable Area 3 L/min 22 L/min - 3/4 in 3/4 BSP 10bar - - - - +60°C -
RS Stock No. 395-6861
Mfr. Part No.155481BSPP
£97.00
Each
Units
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 Stock No. 198-2903
Mfr. Part No.MR3A13BVBN
£68.89
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. 186-0027
Mfr. Part No.EF.7731113290
BrandParker
£163.11
Each
Units
Liquid Variable Area 5 L/min 100 L/min - 1 in 1 BSP Female 10bar PET - - +5°C +60°C -
RS Stock No. 448-7445
Mfr. Part No.MR3A16BVBN
£69.07
Each
Units
Gas Variable Area 2 L/min 30 L/min - 1/8 in 1/8 NPT Female 6.9bar Polycarbonate - +65°C - +65°C -
RS Stock No. 744-0701
Mfr. Part No.PFM710S-C4-B-W
BrandSMC
£208.20
Each
Units
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 Stock No. 395-213
Mfr. Part No.AWM5104VN
BrandHoneywell
£103.38
Each
Units
Dry Gas Amplified 0 sLpm 20 SLPM 15 V dc - 1/4 NPT 50psi Plastic - - 0°C +50°C -
RS Stock No. 456-3066
Mfr. Part No.SF5200
£166.64
Each
Units
Gas, Liquid Modular Flow Monitoring 200 (Gases) ccm/s, 3 (Liquids) ccm/s 300 (Liquids) cm³/s, 3000 (Gases) cm³/s - - M18 x 1.5 300bar Stainless Steel -25 (Gases) °C, -25 (Liquids) °C +80°C - - -
RS Stock No. 740-6436
Mfr. Part No.SU7000
£689.96
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. 361-0206
Mfr. Part No.2530A4L71BVBN
£172.03
Each
Units
Liquid Variable Area 1.5 L/min 20 L/min - 1/4 in 1/4 NPT Female 6.89bar Acrylic - +65°C - +65°C -