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. 901-0264
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. 804-3910
Mfr. Part No.7MF4433-1GA22-2RB1
BrandSiemens
$2,937.53
Each
units
Gas, Liquid, Vapour Digital Pressure Transmitter - - 9 → 24 V - 1/4 NPT 5bar Aluminium -40 °C +85°C -40°C +85°C -
RS Stock No. 198-2953
Mfr. Part No.MR3L10BVBN
$173.87
Each
units
Liquid Variable Area 5 ccm 110 cm³/min - 1/8 in 1/8 NPT Female 6.9bar Polycarbonate - +65°C - +65°C -
RS Stock No. 448-7451
Mfr. Part No.MR3A17BLBN
$177.72
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. 456-3066
Mfr. Part No.SF5200
$337.67
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. 181-0604
Mfr. Part No.E8PC-YL-1
BrandOmron
$54.57
Each
units
- O-Ring - - - - - - - - - -20°C +80°C -
RS Stock No. 395-213
Mfr. Part No.AWM5104VN
BrandHoneywell
$423.91
Each
units
Dry Gas Amplified 0 sLpm 20 SLPM 15 V dc - 1/4 NPT 50psi Plastic - - 0°C +50°C -
RS Stock No. 804-3894
Mfr. Part No.7MF4433-1FA22-2RB1
BrandSiemens
$2,804.85
Each
units
Gas, Liquid, Vapour Digital Pressure Transmitter - - 9 → 24 V - 1/4 NPT 1.6bar Aluminium -40 °C +85°C -40°C +85°C -
RS Stock No. 901-0245
Mfr. Part No.198807811
$344.66
Each
units
- Variable Area - - - - - - - - - - - -
RS Stock No. 181-0596
Mfr. Part No.E8PC-YA-A14
BrandOmron
$177.10
Each
units
- Adapter - - - - R 1/4 Male - SUS304 - - -20°C +80°C -
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. 901-0069
Mfr. Part No.198840143
$848.78
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
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. 804-3917
Mfr. Part No.7MF4433-1EA22-2RB1
BrandSiemens
$2,765.72
Each
units
Gas, Liquid, Vapour Digital Pressure Transmitter - - 9 → 24 V - 1/4 NPT 0.6bar Aluminium -40 °C +85°C -40°C +85°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. 804-3904
Mfr. Part No.7MF4433-1BA22-2RB1
BrandSiemens
$3,062.81
Each
units
Gas, Liquid, Vapour Digital Pressure Transmitter - - 9 → 24 V - 1/4 NPT 0.02bar Aluminium -40 °C +85°C -40°C +85°C -
RS Stock No. 181-0602
Mfr. Part No.E8PC-YS
BrandOmron
$54.57
Each
units
- Throttle - - - - M6 x 0.75 - SUS304 - - -20°C +80°C -
RS Stock No. 144-9343
Mfr. Part No.850085
BrandXylem
$3,207.61
Each
units
Liquid Flow Meter 0.2 m/s 10 m/s 230 V ac - DN80 - - - - -20°C +60°C -
New
RS Stock No. 187-9059
Mfr. Part No.071-06402
$207.50
Each
units
Air Air Bubble Detector - - 5 → 24 V dc - - - ABS/PC Plastic - - 0°C +40°C -
RS Stock No. 256-281
Mfr. Part No.S.800001
BrandParker
$233.91
Each
units
Liquid Variable Area 0.2 L/min 2 L/min - 3/4 in 3/4 BSP 10bar - - - - +60°C -
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