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. 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. 441-4879
Mfr. Part No.S.800004
BrandParker
$262.34
Each
units
Liquid Variable Area 3 L/min 22 L/min - 3/4 in 3/4 BSP 10bar - - - - +60°C -
RS Stock No. 448-7467
Mfr. Part No.MR3A18BVBN
$177.73
Each
units
Gas Variable Area 10 L/min 100 L/min - 1/8 in 1/8 NPT Female 6.9bar Polycarbonate - +65°C - +65°C -
RS Stock No. 187-9060
Mfr. Part No.071-06403
$214.05
Each
units
Air Air Bubble Detector - - 5 → 24 V dc - - - ABS/PC Plastic - - 0°C +40°C -
New
RS Stock No. 196-4458
Mfr. Part No.PF2A721-F03-27N
BrandSMC
$990.08
Each
units
- Flow Switch 20 L/min 200 L/min 12 → 24 V dc - G 0.75MPa PBT - - 0°C +50°C -
RS Stock No. 804-4036
Mfr. Part No.7ME6520-4HC13-2AA1
BrandSiemens
$2,902.16
Each
units
Liquid Electromagnetic 0 m/s 10 m/s - 6 in 1/2 NPT 16bar Carbon Steel - - -40°C +70°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. 407-596
Mfr. Part No.AWM3300V
BrandHoneywell
$226.50
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. 804-3910
Mfr. Part No.7MF4433-1GA22-2RB1
BrandSiemens
$4,386.22
Each
units
Gas, Liquid, Vapour Digital Pressure Transmitter - - 9 → 24 V - 1/4 NPT 5bar Aluminium -40 °C +85°C -40°C +85°C -
New
RS Stock No. 201-2075
Mfr. Part No.SFM3019
BrandSensirion
$255.66
Each
units
- - - - - - - - - - - - - -
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. 623-7933
Mfr. Part No.AWM720P1
BrandHoneywell
$205.08
Each
units
Dry Gas Compensated/Amplified - 200 SLPM 15 V dc 22 mm 4-Pin 25psi Plastic - - -25°C +85°C -
RS Stock No. 144-9342
Mfr. Part No.850084
BrandXylem
$4,302.27
Each
units
Liquid Flow Meter 0.2 m/s 10 m/s 230 V ac - DN65 - - - - -20°C +60°C -
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 -
RS Stock No. 123-7148
Mfr. Part No.ASF1430
BrandSensirion
$487.01
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. 198-2997
Mfr. Part No.FR2A14BVBN
$247.71
Each
units
Gas Variable Area 0.4 L/min 5 L/min - 1/8 in 1/8 NPT Female 6.89bar Acrylic - +65°C - +65°C -
RS Stock No. 136-6375
Mfr. Part No.760-V10-D-RS
BrandAtrato
$1,560.14
Each
units
- - - - - - - - - - - - - -
New
RS Stock No. 200-9556
Mfr. Part No.LS32-1500 Liquid Flow Meter
BrandSensirion
$1,198.20
Each
units
Liquid Liquid Flow Meter 0.01 l/min 0.04 L/min 5 V - - - - - - - - -
RS Stock No. 725-9965
Mfr. Part No.UF25B100
BrandCynergy3
$570.20
Each
units
Liquid Sensor/Switch without Indicator 0.5 L/min 25 L/min 7.5 → 26 V dc 10 mm 3/8 BSP 10bar ABS -10 °C +85°C -10°C +85°C -
RS Stock No. 901-0251
Mfr. Part No.198335426
$621.24
Each
units
Liquid Variable Area 60 l/h 6000 L/h - - DN40 Socket - Plastic - - - - -
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