Flow Sensors & Indicators

Flow sensors and flow indicators are flowmeter 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, that 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 Sensors and Indicators


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 large-capacity measurement. Disadvantages are clogging and maintenance is required to cope with the axial wear otherwise the paddle needs replacing.


Rotaflow or Variable Area Flow Sensors: Rotaflow meters are a tapered tube and a float. It is most 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 flowmeter. The way to select the right flowmeter 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 totalisation?

  • Display or signal output?

  • What is the minimum and maximum flowrate, process pressure and process temperature?

  • Size of the pipe

...
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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. 198-3041
Mfr. Part No.GR2-20 LPM AIR
£196.60
Each
Units
Gas Variable Area 2 L/min 10 L/min - 1/8 in 1/8 NPT Female 13.7bar Borosilicate Glass - - - +93°C -
RS Stock No. 198-0682
Mfr. Part No.FM.26 222 129
BrandParker UCC
£341.74
Each
Units
Liquid Variable Area 2 L/min 20 L/min - 1/2 in 1/2 BSP - Brass - - - +90°C -
RS Stock No. 198-3035
Mfr. Part No.GR 0.5-5LPM AIR
£196.60
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. 185-9998
Mfr. Part No.S.800003
BrandParker
£87.14
Each
Units
Liquid Variable Area 0.07 L/min 0.55 L/min - 1/4 in 1/4 BSP 10bar - - - - +60°C -
RS Stock No. 849-9436
Mfr. Part No.PFMV530-1
BrandSMC
£130.56
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. 395-6928
Mfr. Part No.156265BSPP
£206.20
Each
Units
Liquid RotorFlow Electronic 2 L/min 20 L/min 24 V dc - 1/4 BSP Female 14bar Brass -29 °C +100°C -29°C +100°C -
RS Stock No. 125-0660
Mfr. Part No.SPI-N118-1421-1-3-001
BrandSimex
£210.08
Each
Units
Gas, Liquid Flow Counter - - 24 V dc - M12 - ABS, Fibreglass - - 0°C +50°C 100 mA
RS Stock No. 407-574
Mfr. Part No.AWM3100V
BrandHoneywell
£101.16
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. 407-546
Mfr. Part No.AWM2100V
BrandHoneywell
£91.95
Each
Units
Dry Gas Unamplified -200 sccm 200 cm³/min 15 V dc 0.2 in - 25psi Plastic - - -25°C +85°C -
RS Stock No. 907-3953
Mfr. Part No.155421
£122.59
Each
Units
Liquid RotorFlow Electronic 0.1 gal/min 5 gal/min 4.5 → 24 V dc 1/4 in 1/4 NPT Female 6.9bar Ploypropylene - +21°C -29°C +82°C 8 mA
RS Stock No. 313-5553
Mfr. Part No.426506
BrandBurkert
£1,356.85
Each
Units
- - - - 18 → 36 V dc DN 6 → 400 mm - - - - - -10°C +60°C -
RS Stock No. 395-190
Mfr. Part No.AWM5102VN
BrandHoneywell
£127.43
Each
Units
Dry Gas Amplified 0 sLpm 10 SLPM 15 V dc - 1/4 NPT 50psi Plastic - - 0°C +50°C -
RS Stock No. 395-6906
Mfr. Part No.155425BSPP
£172.70
Each
Units
Liquid RotorFlow Electronic 2 L/min 20 L/min 24 V dc 1/4 in 1/2 BSP Female 7bar Polypropylene -29 °C +82°C -29°C +80°C -
RS Stock No. 740-6449
Mfr. Part No.SU9000
£938.39
Each
Units
Liquid Ultrasonic 0 L/min 200 L/min 19 → 30 V dc - 1-1/4 BSP 16bar Aluminium Alloy -10 °C +80°C -10°C +60°C -
RS Stock No. 173-2223
Mfr. Part No.LG01-2000A090
BrandSensirion
£80.388
Each (In a Tray of 25)
Units
Liquid Liquid Flow Switch 250 (Isopropyl Alcohol) 250 (Isopropyl Alcohol) ml/min, 50 (Water) ml/min 5 → 12 V 9.2 mm 5 Pin PCB Header 3bar Borosilicate Glass (Tube Material), FEP (Sealing), PEEk (Fitting) - - +10°C +50°C 6.8 mA
RS Stock No. 898-6731
Mfr. Part No.LG01-2000A090
BrandSensirion
£81.90
Each
Units
Liquid Liquid Flow Switch 250 (Isopropyl Alcohol) 250 (Isopropyl Alcohol) ml/min, 50 (Water) ml/min 5 → 12 V 9.2 mm 5 Pin PCB Header 3bar Borosilicate Glass (Tube Material), FEP (Sealing), PEEk (Fitting) - - +10°C +50°C 6.8 mA
RS Stock No. 407-568
Mfr. Part No.AWM2300V
BrandHoneywell
£92.86
Each
Units
Dry Gas Unamplified -1000 sccm 1000 cm³/min 15 V dc 0.2 in - 25psi Plastic - - -25°C +85°C -
RS Stock No. 456-3050
Mfr. Part No.SF5350
£172.31
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. 395-6912
Mfr. Part No.155485BSPP
£172.70
Each
Units
Liquid RotorFlow Electronic 15 L/min 75 L/min 24 V dc 1/2 in 1/2 BSP Female 6.9bar Polypropylene -29 °C +82°C -29°C +82°C -
RS Stock No. 901-0249
Mfr. Part No.198807001
£82.08
Each
Units
Liquid Variable Area 50 l/h 50 L/h - - DN10 Socket - Plastic - - - - -
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