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?

...
Read more Read less

Filters

Viewing 81 - 100 of 348 products
Results per page
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. 395-6990
Mfr. Part No.166701-A
£35.80
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. 186-0049
Mfr. Part No.EF7731110220
BrandParker UCC
£159.98
Each
Units
Liquid Variable Area 1 L/min 15 L/min - 1 in 1 BSP Female 10bar PET - - +5°C +60°C -
RS Stock No. 361-0161
Mfr. Part No.2530A4A72BVBN
£172.03
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. 123-7151
Mfr. Part No.SFM4100 Air
BrandSensirion
£118.95
Each
Units
Gas Digital Mass 0 slm 20 slm 3.5 → 9 V 15.35 mm 2-Wire I2C 6 bar, 10 (Over Pressure) bar Aluminium (Coated), Epoxy, Gold, Nickel Plated Brass, Nitrile, Nylon, Oxygenoex, Pa-12, Si, Si3n4, Siox, Stainless Steel, Viton® 0 °C +50°C -20°C +80°C <12.5 mA
RS Stock No. 907-3959
Mfr. Part No.155420
£63.36
Each
Units
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 Stock No. 804-3926
Mfr. Part No.7MF4997-1BE
BrandSiemens
£125.16
Each
Units
- Cover with Window - - - - - - Die-Cast Aluminium - - - - -
RS Stock No. 361-0262
Mfr. Part No.2540A5A54PI
£246.76
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. 395-6877
Mfr. Part No.156261BSPP
£128.90
Each
Units
Liquid RotorFlow Electronic 2 L/min 20 L/min 4.5 → 24 V dc 1/4 in 1/4 BSP Female 13.8bar Brass -29 °C +100°C -29°C +100°C -
RS Stock No. 616-3472
Mfr. Part No.197091
£34.20
Each
Units
Liquid Piston - 0.25 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 Stock No. 901-0069
Mfr. Part No.198840143
£472.11
Each
Units
Liquid Paddlewheel 0.1 m/s 6 m/s 5 → 24 V dc 0.5 → 4.0 in DN15 to DN 100 Socket 12.5bar Polypropylene - - -18°C +85°C <1.5 mA @ 3.3 → 6 V dc, <20 mA @ 6 → 24 V dc
RS Stock No. 395-6962
Mfr. Part No.166702
£35.80
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. 744-0705
Mfr. Part No.PFM725S-C6-A-W
BrandSMC
£206.38
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. 361-0256
Mfr. Part No.2540A5A53PI
£246.76
Each
Units
Gas Variable Area 100 L/min 700 L/min - 1 in 1 NPT Female 6.89bar Acrylic - +65°C - +65°C -
RS Stock No. 123-7149
Mfr. Part No.SFM3000-200C
BrandSensirion
£97.78
Each
Units
Gas Low Pressure Drop -200 slm 200 slm 5 V 22 mm 2-Wire I2C 1.3bar Epoxy, Gold, Polyurethane, PPE+PS Blend, Si, Si3n4, Siox, Stainless Steel (Annealed) -20 °C +80°C -20°C +80°C -
RS Stock No. 286-260
Mfr. Part No.EF.7731111290
BrandParker
£163.11
Each
Units
Liquid Variable Area 2 L/min 30 L/min - 1 in 1 BSP Female 10bar PET - - +5°C +60°C -
RS Stock No. 286-276
Mfr. Part No.EF77311142220
BrandParker
£163.11
Each
Units
Liquid Variable Area 10 L/min 150 L/min - 1 in 1 BSP Female 10bar PET - - +5°C +60°C -
RS Stock No. 185-9948
Mfr. Part No.EF.7731110291
BrandParker UCC
£279.57
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. 780-0289
Mfr. Part No.FSVPLC06
BrandCynergy3
£67.51
Each
Units
Liquid In-line 0.6 L/min 80 L/min 5 V ac G1 1 BSP Female 8bar Brass - +85°C - +85°C -
RS Stock No. 395-6855
Mfr. Part No.155421BSPP
£97.00
Each
Units
Liquid RotorFlow Electronic 2 L/min 20 L/min 4.5 → 24 V dc 1/4 in 1/4 BSP Female 6.9bar Polypropylene -29 °C +82°C -29°C +82°C -
RS Stock No. 286-298
Mfr. Part No.EF.7731114291
BrandParker
£292.99
Each
Units
Liquid Variable Area 10 L/min 150 L/min 240 V ac 1 in 1 BSP Female 10bar PET - - +5°C +60°C -