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. 407-574
Mfr. Part No.AWM3100V
BrandHoneywell
TWD2,947.00
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. 446-8292
Mfr. Part No.173037-C
TWD3,285.00
Each
units
Liquid Turbine 1 L/min 10 L/min 5 → 24 V dc 3/8 in 3/8 BSP 200psi Nylon 12 - - -20°C +100°C -
RS Stock No. 395-6912
Mfr. Part No.155485BSPP
TWD7,414.00
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. 407-596
Mfr. Part No.AWM3300V
BrandHoneywell
TWD3,244.00
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. 907-3978
Mfr. Part No.155485
TWD9,953.00
Each
units
Liquid RotorFlow Electronic 1.5 gal/min 20 gal/min 24 V dc 1/2 in 1/2 NPT Female 6.9bar Polypropylene - +21°C -29°C +82°C 20 mA @ 24 V dc (No Load), 35 mA @ 24 V dc (Load)
RS Stock No. 907-3969
Mfr. Part No.155481
TWD5,220.00
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. 446-8286
Mfr. Part No.173936-C
TWD3,009.00
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. 446-8315
Mfr. Part No.173940-C
TWD3,009.00
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. 123-7148
Mfr. Part No.ASF1430
BrandSensirion
TWD9,620.00
Each
units
Air, Gas Flow Meter -400 sccm 400 sccm 7 18 V dc 5 mm RS-232, SPI 2bar PBT 0 °C +60°C 0°C +70°C 19 mA
RS Stock No. 395-213
Mfr. Part No.AWM5104VN
BrandHoneywell
TWD4,809.00
Each
units
Dry Gas Amplified 0 sLpm 20 SLPM 15 V dc - 1/4 NPT 50psi Plastic - - 0°C +50°C -
RS Stock No. 508-2704
BrandRS PRO
TWD4,531.00
Each
units
- - - 0.05 10 L/min 4.5 24 V dc 8 mm - - - - - -25°C +125°C 8 mA
RS Stock No. 395-6827
Mfr. Part No.155420BSPP
TWD2,533.00
Each
units
Liquid RotorFlow Electronic 2 L/min 20 L/min - 1/4 in 1/4 BSP Female 6.9bar Polypropylene -29 °C +82°C -29°C +82°C -
RS Stock No. 446-8309
Mfr. Part No.173939-C
TWD3,009.00
Each
units
Liquid Turbine 1 L/min 15 L/min 5 → 24 V dc 3/8 in 3/8 BSP 200psi Nylon 12 - - -20°C +100°C -
RS Stock No. 123-7149
Mfr. Part No.SFM3000-200C
BrandSensirion
TWD3,322.00
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. 448-7445
Mfr. Part No.MR3A16BVBN
TWD2,907.00
Each
units
Gas Variable Area 2 L/min 30 L/min - 1/8 in 1/8 NPT Female 6.9bar Polycarbonate - +65°C - +65°C -
RS Stock No. 511-4772
BrandRS PRO
TWD1,554.00
Each
units
Liquid Beverage 0.6 L/min 10 L/min 4.5 24 V dc 43315 in 3/8 Push On 10bar PVDF - - 0°C +125°C 10 mA
RS Stock No. 511-3971
BrandRS PRO
TWD15,592.00
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. 511-3909
BrandRS PRO
TWD9,967.00
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. 257-133
BrandRS PRO
TWD1,413.00
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. 125-0660
Mfr. Part No.SPI-N118-1421-1-3-001
BrandSimex
TWD9,148.00
Each
units
Gas, Liquid Flow Counter - - 24 V dc - M12 - ABS, Fibreglass - - 0°C +50°C 100 mA