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. 613-4222
BrandRS PRO
SGD258.74
Each
units
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 Stock No. 511-3915
BrandRS PRO
SGD418.71
Each
units
- - - 6 → 100 L/min 4.5 → 24 V dc 3/4 in - - - - - -25°C +125°C 10 mA
RS Stock No. 198-2997
Mfr. Part No.25102A14BVBN
SGD152.44
Each
units
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 Stock No. 740-6433
Mfr. Part No.SM8000
SGD1,144.08
Each
units
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 Stock No. 407-574
Mfr. Part No.AWM3100V
BrandHoneywell
SGD191.64
Each
units
Dry Gas Amplified -200 sccm 200 cm³/min 15 V dc 0.2 in - 25psi Plastic - - -25°C +85°C -
RS Stock No. 395-6827
Mfr. Part No.155420BSPP
SGD123.60
Each
units
Liquid RotorFlow Electronic 2 L/min 20 L/min - 1/4 in 1/4 BSP Female 6.9bar Polypropylene -29 °C +82°C -29°C +82°C -
RS Stock No. 395-184
Mfr. Part No.AWM5101VN
BrandHoneywell
SGD225.90
Each
units
Dry Gas Amplified 0 sLpm 5 SLPM 15 V dc - 1/4 NPT 50psi Plastic - - 0°C +50°C -
RS Stock No. 361-0199
Mfr. Part No.2530A4L69BVBN
SGD343.04
Each
units
Liquid Variable Area 0.8 L/min 9 L/min - 1/4 in 1/4 NPT Female 6.89bar Acrylic - +65°C - +65°C -
RS Stock No. 744-0714
Mfr. Part No.PFM725S-C6-B-W
BrandSMC
SGD423.46
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. 395-9337
Mfr. Part No.142542BSPP
SGD165.66
Each
units
Liquid RotorFlow 15 L/min 75 L/min - 1/2 in 1/2 BSP Female 13.8bar Brass -29 °C +100°C -29°C +100°C -
RS Stock No. 395-6990
Mfr. Part No.166701-A
SGD74.99
Each
units
Gas Piston - 28 L/min 120 → 240 V ac/dc 1/4 in 1/4 BSP 10bar Noryl - +100°C - +100°C -
RS Stock No. 849-9436
Mfr. Part No.PFMV530-1
BrandSMC
SGD265.55
Each
units
Dry Air, Gas Suction 0 L/min 3 L/min 12 → 24 V dc 4 mm One-Touch Fitting 500kPa PPS 0 °C +50°C 0°C +50°C -
RS Stock No. 361-0177
Mfr. Part No.2530A4A70BVBN
SGD343.04
Each
units
Gas Variable Area 30 L/min 280 L/min - 1/4 in 1/4 NPT Female 6.89bar Acrylic - +65°C - +65°C -
RS Stock No. 744-0705
Mfr. Part No.PFM725S-C6-A-W
BrandSMC
SGD419.76
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. 395-190
Mfr. Part No.AWM5102VN
BrandHoneywell
SGD220.53
Each
units
Dry Gas Amplified 0 sLpm 10 SLPM 15 V dc - 1/4 NPT 50psi Plastic - - 0°C +50°C -
RS Stock No. 361-0228
Mfr. Part No.2540A5L60PI
SGD492.04
Each
units
Liquid Variable Area 4 L/min 36 L/min - 1 in 1 NPT Female 6.89bar Acrylic - +65°C - +65°C -
RS Stock No. 448-7451
Mfr. Part No.MR3A17BVBN
SGD141.87
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. 256-297
Mfr. Part No.S.800002
BrandParker
SGD151.99
Each
units
Liquid Variable Area 1.5 L/min 10 L/min - 3/4 in 3/4 BSP 10bar - - - - +60°C -
RS Stock No. 361-0206
Mfr. Part No.2530A4L71BVBN
SGD343.04
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 -
RS Stock No. 407-596
Mfr. Part No.AWM3300V
BrandHoneywell
SGD173.44
Each
units
Dry Gas Amplified -1000 sccm 1000 cm³/min 15 V dc 0.2 in - 25psi Plastic - - -25°C +85°C -