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. 313-2469
Mfr. Part No.FCS-G1/4A4-NA-H1141
BrandTurck
SGD697.02
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 - 1/4 in 1/4 BSP 100bar Stainless Steel -25 °C +80°C -25°C +80°C -
RS Stock No. 256-281
Mfr. Part No.S.800001
BrandParker
SGD179.08
Each
units
Liquid Variable Area 0.2 L/min 2 L/min - 3/4 in 3/4 BSP 10bar - - - - +60°C -
RS Stock No. 511-3909
BrandRS PRO
SGD481.47
Each
units
- - - 2.5 → 30.0 L/min 4.5 → 24 V dc 1/2 in - - - - - -25°C +125°C 10 mA
RS Stock No. 185-9948
Mfr. Part No.EF.7731110291
BrandParker UCC
SGD591.38
Each
units
Liquid Variable Area 1 L/min 15 L/min 240 V ac 1 in 1 BSP Female 10bar PET - - +5°C +60°C -
RS Stock No. 198-0806
Mfr. Part No.FS.643 322 229
BrandParker UCC
SGD1,284.55
Each
units
Liquid Boxed Two-Switch 10 L/min 110 L/min 250 V ac 3/4 in - 350bar Stainless Steel - - -20°C +90°C -
RS Stock No. 361-0161
Mfr. Part No.2530A4A72BVBN
SGD353.43
Each
units
Gas Variable Area 14 L/min 140 L/min - 1/4 in 1/4 NPT Female 6.89bar Acrylic - +65°C - +65°C -
RS Stock No. 907-3997
Mfr. Part No.173138
SGD286.23
Each
units
Fluid, Liquid RotorFlow 1.5 gal/min 20 gal/min - 1/2 in 1/2 NPT Female 13.8bar Stainless Steel - +21°C -29°C +100°C -
RS Stock No. 395-6962
Mfr. Part No.166702
SGD76.46
Each
units
Liquid Piston - 1 L/min 120 → 240 V ac/dc 1/4 in 1/4 BSP 10bar Noryl - +100°C - +100°C -
RS Stock No. 446-8286
Mfr. Part No.173936-C
SGD149.73
Each
units
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 Stock No. 901-0227
Mfr. Part No.198807011
SGD591.19
Each
units
Liquid Variable Area 5 L/h 50 L/h - - DN10 Socket - Plastic - - - - -
RS Stock No. 395-6833
Mfr. Part No.155480BSPP
SGD126.03
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. 804-3926
Mfr. Part No.7MF4997-1BE
BrandSiemens
SGD238.16
Each
units
- Cover with Window - - - - - - Die-Cast Aluminium - - - - -
RS Stock No. 510-0600
BrandRS PRO
SGD426.36
Each
units
Gas, Liquid Piston Inline 0.1 L/min 0.6 L/min 200 V ac 8 mm 1/4 BSP Female 16bar Aluminium - +100°C - +120°C 1 A
RS Stock No. 395-6984
Mfr. Part No.166704
SGD77.98
Each
units
Liquid Piston - 3.8 L/min 120 → 240 V ac/dc 1/4 in R 1/4" 10bar Noryl - +100°C - +100°C -
RS Stock No. 198-3035
Mfr. Part No.1250AD6053ALAVB
SGD407.72
Each
units
Gas Variable Area 0.5 L/min 5 L/min - 1/8 in 1/8 NPT Female 13.7bar Borosilicate Glass - - - +93°C -
RS Stock No. 510-0616
BrandRS PRO
SGD426.36
Each
units
Gas, Liquid Piston Inline 0.5 L/min 3 L/min - 8 mm 1/4 BSP Female 16bar Aluminium - +100°C - +120°C -
RS Stock No. 361-0262
Mfr. Part No.2540A5A54PI
SGD501.70
Each
units
Gas Variable Area 100 L/min 1400 L/min - 1 in 1 NPT Female 6.89bar Acrylic - +65°C - +65°C -
RS Stock No. 511-3971
BrandRS PRO
SGD753.22
Each
units
Liquid Turbine 0.5 L/min 15 L/min 4.5 → 24 V dc 1/2 in 1/2 BSP 10bar Stainless Steel - - -25°C +125°C -
RS Stock No. 744-0717
Mfr. Part No.PFM750S-C8-A-W
BrandSMC
SGD432.48
Each
units
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 Stock No. 361-0256
Mfr. Part No.2540A5A53PI
SGD501.70
Each
units
Gas Variable Area 100 L/min 700 L/min - 1 in 1 NPT Female 6.89bar Acrylic - +65°C - +65°C -