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. 125-0660
Mfr. Part No.SPI-N118-1421-1-3-001
BrandSimex
kr 2 833,57
Each
Units
Gas, Liquid Flow Counter - - 24 V dc - M12 - ABS, Fibreglass - - 0°C +50°C 100 mA
RS Stock No. 446-8315
Mfr. Part No.173940-C
kr 1 012,45
Each
Units
Liquid Turbine 2 L/min 30 L/min 5 → 24 V dc 3/8 in 3/8 BSP 200psi Nylon 12 - - -20°C +100°C -
RS Stock No. 286-260
Mfr. Part No.EF.7731111290
BrandParker
kr 1 313,83
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. 906-7793
Mfr. Part No.VFA-9
kr 390,95
Each
Units
Air Variable Area 20 SCFH 200 SCFH - 1/8 in 1/8 NPT Female 6.9 (With Valve) bar, 10 (Without Valve) bar Acrylic Plastic - +38 (Without Valve) °C, +48 (With Valve) °C - - -
RS Stock No. 407-596
Mfr. Part No.AWM3300V
BrandHoneywell
kr 1 084,93
Each
Units
Dry Gas Amplified -1000 sccm 1000 cm³/min 15 V dc 0.2 in - 25psi Plastic - - -25°C +85°C -
RS Stock No. 257-133
BrandRS PRO
kr 452,73
Each
Units
Liquid Radial Flow Turbine 1.5 L/min 30 L/min 4.5 → 16 V dc 15 mm - 20bar Acetal Copolymer - - -40°C +70°C 10 mA
RS Stock No. 907-4057
Mfr. Part No.212465
kr 628,51
Each
Units
Liquid Turbine 0.1 l/min 2.5 L/min 5 → 24 V dc 1/4 in 1/4 NPT Female 24bar Nylon 12 - - -20°C +100°C -
RS Stock No. 804-3913
Mfr. Part No.7MF4433-1CA22-2RB1
BrandSiemens
kr 27 721,09
Each
Units
Gas, Liquid, Vapour Digital Pressure Transmitter - - 9 → 24 V - 1/4 NPT 0.06bar Aluminium -40 °C +85°C -40°C +85°C -
RS Stock No. 256-297
Mfr. Part No.S.800002
BrandParker
kr 768,02
Each
Units
Liquid Variable Area 1.5 L/min 10 L/min - 3/4 in 3/4 BSP 10bar - - - - +60°C -
RS Stock No. 198-3007
Mfr. Part No.FR2A15BVBN
kr 896,76
Each
Units
Gas Variable Area 1 L/min 10 L/min - 1/8 in 1/8 NPT Female 6.89bar Acrylic - +65°C - +65°C -
RS Stock No. 907-3953
Mfr. Part No.155421
kr 1 141,17
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. 725-9969
Mfr. Part No.UF08B100
BrandCynergy3
kr 2 388,83
Each
Units
Liquid Sensor/Switch without Indicator 0.4 L/min 8 L/min 7.5 → 26 V dc 10 mm 3/8 Straight Tube 10bar ABS -10 °C +85°C -10°C +85°C -
RS Stock No. 313-5553
Mfr. Part No.426506
BrandBurkert
kr 13 341,22
Each
Units
- - - - 18 → 36 V dc DN 6 → 400 mm - - - - - -10°C +60°C -
RS Stock No. 198-0682
Mfr. Part No.FM.26 222 129
BrandParker UCC
kr 3 547,80
Each
Units
Liquid Variable Area 2 L/min 20 L/min - 1/2 in 1/2 BSP - Brass - - - +90°C -
RS Stock No. 740-6433
Mfr. Part No.SM8000
kr 6 720,78
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. 907-4003
Mfr. Part No.173931-C
kr 863,80
Each
Units
Liquid Turbine 0.5 l/min 5 L/min 5 → 24 V dc 3/8 in 3/8 NPT Male 13.7bar Nylon 12 - - -20°C +100°C 8 mA
RS Stock No. 456-3050
Mfr. Part No.SF5350
kr 1 691,91
Each
Units
Gas, Liquid Modular Flow Monitoring 3 (Liquids) ccm/s, 200 (Gases) 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. 407-574
Mfr. Part No.AWM3100V
BrandHoneywell
kr 1 079,00
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. 907-3969
Mfr. Part No.155481
kr 1 141,17
Each
Units
Liquid RotorFlow Electronic 1.5 gal/min 20 gal/min 4.5 → 24 V dc 1/2 in 1/2 NPT Female 6.9bar Ploypropylene - +21°C -29°C +82°C 8 mA
RS Stock No. 441-4879
Mfr. Part No.S.800004
BrandParker
kr 778,70
Each
Units
Liquid Variable Area 3 L/min 22 L/min - 3/4 in 3/4 BSP 10bar - - - - +60°C -
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