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. 901-0249
Mfr. Part No.198807001
$245.91
Each
units
Liquid Variable Area 50 l/h 50 L/h - - DN10 Socket - Plastic - - - - -
RS Stock No. 361-0212
Mfr. Part No.FR5L59PI
$402.89
Each
units
Liquid Variable Area 1 L/min 19 L/min - 1 in 1 NPT Female 6.89bar Acrylic - +65°C - +65°C -
RS Stock No. 901-0239
Mfr. Part No.198807008
$308.75
Each
units
Liquid Variable Area 500 l/h 500 L/h - - DN25 Socket - Plastic - - - - -
RS Stock No. 901-0236
Mfr. Part No.199335425
$543.40
Each
units
Liquid Variable Area 300 l/h 3000 L/h - - DN40 Socket - Plastic - - - - -
RS Stock No. 616-3466
Mfr. Part No.216446
$60.51
Each
units
Liquid Piston - 0.07 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. 198-0806
Mfr. Part No.FS.643 322 229
BrandParker UCC
$2,801.85
Each
units
Liquid Boxed Two-Switch 10 L/min 110 L/min 250 V ac 3/4 in - 350bar Stainless Steel - - -20°C +90°C -
RS Stock No. 181-0598
Mfr. Part No.E8PC-YA-B14N
BrandOmron
$177.10
Each
units
- Adapter - - - - G 1/4 Male - SUS304 - - -20°C +80°C -
RS Stock No. 361-0161
Mfr. Part No.FR4L72BVBN
$459.35
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. 181-0608
Mfr. Part No.E8PC-010T-E
BrandOmron
$1,058.02
Each
units
Gas, Liquid Flow Sensor -0.1 MPa 1 MPa 10 → 30 V dc G3/4 Male in M12 4 Pole Connector 1MPa Al2O3 ((alumina) Diaphragm Pressure Port), FKM (O-Ring), PBT (Button), PES (Display Unit), PPSU (Head), SUS304L (Chassis), SUS304L (Pressure Port) -20 °C +100°C -20°C +80°C 120 mA
RS Stock No. 123-7148
Mfr. Part No.ASF1430
BrandSensirion
$477.07
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. 740-6430
Mfr. Part No.SU8000
$1,368.56
Each
units
Liquid Ultrasonic 0 L/min 100 L/min 19 → 30 V dc - 1 BSP 16bar Aluminium Alloy -10 °C +80°C -10°C +60°C -
RS Stock No. 181-0600
Mfr. Part No.E8PC-YA-C18
BrandOmron
$177.10
Each
units
- Adapter - - - - NPT 1/8 Male - SUS304 - - -20°C +80°C -
RS Stock No. 898-6731
Mfr. Part No.LG01-2000A090
BrandSensirion
$271.74
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. 198-2931
Mfr. Part No.MR3A15BVBN
$159.50
Each
units
Gas Variable Area 1 L/min 10 L/min - 1/8 in 1/8 NPT Female 6.9bar Polycarbonate - +65°C - +65°C -
RS Stock No. 901-0264
Mfr. Part No.198801898
$569.24
Each
units
Liquid Variable Area 50 l/h 500 L/h - Maximum of 32 mm DN25 Socket - Plastic - - - - -
RS Stock No. 286-298
Mfr. Part No.EF.7731114291
BrandParker
$489.47
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 -
RS Stock No. 174-9067
Mfr. Part No.SFM3200-250
BrandSensirion
$276.76
Each
units
- Digital Flow Meter -100 SLPM 250 SLPM 5 V 23.5 → 26 mm JST B4B-ZR-SM4-TF 1.07bar Gold, Polyurethane, PPSU, Si, Si3N4, Stainless Steel 10 °C +50°C +10°C +50°C -
RS Stock No. 181-0609
Mfr. Part No.E8PC-100T-E
BrandOmron
$1,058.02
Each
units
Liquid Flow Sensor 0 MPa 10 MPa 10 → 30 V dc G3/4 Male in M12 4 Pole Connector 10MPa Al2O3 ((alumina) Diaphragm Pressure Port), FKM (O-Ring), PBT (Button), PES (Display Unit), PPSU (Head), SUS304L (Chassis), SUS304L (Pressure Port) -20 °C +100°C -20°C +80°C 120 mA
RS Stock No. 181-0601
Mfr. Part No.E8PC-YA-C14
BrandOmron
$177.10
Each
units
- Adapter - - - - NPT 1/2 Male - SUS304 - - -20°C +80°C -
RS Stock No. 740-6424
Mfr. Part No.SM7000
$955.67
Each
units
Liquid Magnetic-Inductive 0.2 L/min 50 L/min 19 → 30 V dc - 3/4 BSP 16bar PBT, Stainless Steel -20 °C +80°C -10°C +60°C -
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