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. 804-3907
Mfr. Part No.7MF4433-1DA22-2RB1
BrandSiemens
$4,131.81
Each
units
Gas, Liquid, Vapour Digital Pressure Transmitter - - 9 → 24 V - 1/4 NPT 0.25bar Aluminium -40 °C +85°C -40°C +85°C -
RS Stock No. 144-9339
Mfr. Part No.85 04 73
BrandXylem
$4,139.75
Each
units
Liquid Flow Meter 0.2 m/s 10 m/s 230 V ac - DN25 - - - - -20°C +60°C -
RS Stock No. 725-9969
Mfr. Part No.UF08B100
BrandCynergy3
$432.92
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. 901-0245
Mfr. Part No.198807811
$377.92
Each
units
- Variable Area - - - - - - - - - - - -
RS Stock No. 256-281
Mfr. Part No.S.800001
BrandParker
$236.04
Each
units
Liquid Variable Area 0.2 L/min 2 L/min - 3/4 in 3/4 BSP 10bar - - - - +60°C -
RS Stock No. 286-282
Mfr. Part No.EF.7731111291
BrandParker
$784.09
Each
units
Liquid Variable Area 2 L/min 30 L/min 240 V ac 1 in 1 BSP Female 10bar PET - - +5°C +60°C -
New
RS Stock No. 196-4457
Mfr. Part No.IFW510-F03-00-Q
BrandSMC
$339.22
Each
units
- Flow Switch 1 L/min 10 L/min - - G 0.6MPa BC6 - - +5°C +60°C -
New
RS Stock No. 196-4460
Mfr. Part No.PF3W720-F04-ETN-M
BrandSMC
$1,219.10
Each
units
- Flow Switch 2 L/min 16 L/min 12 → 24 V dc - G 1MPa PPS, Stainless Steel 0 °C +90°C 0°C +50°C 50 mA
RS Stock No. 804-3926
Mfr. Part No.7MF4997-1BE
BrandSiemens
$277.97
Each
units
- Cover with Window - - - - - - Die-Cast Aluminium - - - - -
RS Stock No. 361-0228
Mfr. Part No.FR5L60PI
$569.88
Each
units
Liquid Variable Area 4 L/min 36 L/min - 1 in 1 NPT Female 6.89bar Acrylic - +65°C - +65°C -
New
RS Stock No. 196-4463
Mfr. Part No.PFM711-C6-E
BrandSMC
$436.44
Each
units
- Flow Switch 2 L/min 100 L/min 5 V - One Touch Fitting 750kPa Brass, LCP, PBT 0 °C +50°C 0°C +50°C 55 mA
RS Stock No. 181-0608
Mfr. Part No.E8PC-010T-E
BrandOmron
$1,067.64
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. 456-3050
Mfr. Part No.SF5350
$428.98
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. 181-0595
Mfr. Part No.E8PC-YA-A18
BrandOmron
$177.10
Each
units
- Adapter - - - - R 1/8 Male - SUS304 - - -20°C +80°C -
RS Stock No. 186-0027
Mfr. Part No.EF.7731113290
BrandParker
$432.26
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. 395-190
Mfr. Part No.AWM5102VN
BrandHoneywell
$300.18
Each
units
Dry Gas Amplified 0 sLpm 10 SLPM 15 V dc - 1/4 NPT 50psi Plastic - - 0°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. 804-3901
Mfr. Part No.7MF4433-1HA22-2RB1
BrandSiemens
$4,386.22
Each
units
Gas, Liquid, Vapour Digital Pressure Transmitter - - 9 → 24 V - 1/4 NPT 30bar Aluminium -40 °C +85°C -40°C +85°C -
RS Stock No. 187-9059
Mfr. Part No.071-06402
$214.05
Each
units
Air Air Bubble Detector - - 5 → 24 V dc - - - ABS/PC Plastic - - 0°C +40°C -
RS Stock No. 901-0069
Mfr. Part No.198840143
$1,090.31
Each
units
Liquid Paddlewheel 0.1 m/s 6 m/s 5 → 24 V dc 0.5 → 4.0 in DN15 to DN 100 Socket 12.5bar Polypropylene - - -18°C +85°C <1.5 mA @ 3.3 → 6 V dc, <20 mA @ 6 → 24 V dc