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. 256-297
Mfr. Part No.S.800002
BrandParker
MYR569.95
Each
units
Liquid Variable Area 1.5 L/min 10 L/min - 3/4 in 3/4 BSP 10bar - - - - +60°C -
RS Stock No. 511-3915
BrandRS PRO
MYR1,564.85
Each
units
- - - 6 → 100 L/min 4.5 → 24 V dc 3/4 in - - - - - -25°C +125°C 10 mA
RS Stock No. 623-7927
Mfr. Part No.AWM43300V
BrandHoneywell
MYR584.25
Each
units
Dry Gas Amplified - 1000 cm³/s 15 V dc 0.246 in - 150psi Plastic - - -25°C +85°C -
RS Stock No. 185-9926
Mfr. Part No.EF.7731113291
BrandParker UCC
MYR1,915.64
Each
units
Liquid Variable Area 5 L/min 100 L/min 240 V ac 1 in 1 BSP Female 10bar PET - - +5°C +60°C -
RS Stock No. 510-0644
BrandRS PRO
MYR1,552.09
Each
units
Gas, Liquid Piston Inline 5 L/min 30 L/min 250 V ac 15 mm 1/2 BSP Female 50bar Nickel Plated Brass -20 °C +90°C -20°C +70°C 1 A
RS Stock No. 407-574
Mfr. Part No.AWM3100V
BrandHoneywell
MYR528.70
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. 186-0027
Mfr. Part No.EF.7731113290
BrandParker
MYR1,099.44
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. 849-9436
Mfr. Part No.PFMV530-1
BrandSMC
MYR870.89
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. 907-3959
Mfr. Part No.155420
MYR358.66
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. 448-7451
Mfr. Part No.MR3A17BVBN
MYR456.45
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. 407-546
Mfr. Part No.AWM2100V
BrandHoneywell
MYR683.54
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. 447-4449
BrandRS PRO
MYR1,905.52
Each
units
Liquid Oval Gear 0.01 L/min 4 L/min 5 → 24 V dc 1/4 in 1/4 BSP 50bar Stainless Steel - - - - -
RS Stock No. 901-0071
Mfr. Part No.159001296
MYR3,514.57
Each
units
- Paddlewheel - - - - - - - - - - - -
RS Stock No. 914-8495
Mfr. Part No.SPP-N118-1421-1-4-001
BrandSimex
MYR1,035.56
Each
units
Fluid, Gas Flow Counter - - 85 → 260 V ac - Screw 25kPa ABS, Fibreglass - - 0°C +50°C 4 → 20 mA
RS Stock No. 198-0682
Mfr. Part No.FM.26 222 129
BrandParker UCC
MYR2,279.51
Each
units
Liquid Variable Area 2 L/min 20 L/min - 1/2 in 1/2 BSP - Brass - - - +90°C -
RS Stock No. 198-0676
Mfr. Part No.FM.26 122 329
BrandParker UCC
MYR1,894.10
Each
units
Liquid Variable Area 1 L/min 9 L/min - 1/4 in 1/4 BSP - Brass - - - +90°C -
RS Stock No. 198-2919
Mfr. Part No.MR3A14BVBN
MYR459.17
Each
units
Gas Variable Area 0.4 L/min 5 L/min - 1/8 in 1/8 NPT Female 6.9bar Polycarbonate - +65°C - +65°C -
RS Stock No. 804-3926
Mfr. Part No.7MF4997-1BE
BrandSiemens
MYR787.10
Each
units
- Cover with Window - - - - - - Die-Cast Aluminium - - - - -
RS Stock No. 198-0698
Mfr. Part No.FM.26 222 229
BrandParker
MYR2,324.21
Each
units
Liquid Variable Area 5 L/min 46 L/min - 1/2 in 1/2 BSP - Brass - - - +90°C -
RS Stock No. 198-2953
Mfr. Part No.MR3L10BVBN
MYR450.51
Each
units
Liquid Variable Area 5 ccm 110 cm³/min - 1/8 in 1/8 NPT Female 6.9bar Polycarbonate - +65°C - +65°C -