Flow Sensors

Flow sensors or flow indicators are flow meter 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 (these 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 Sensor

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 a large-capacity measurement. Disadvantages are clogging and maintenance is required to cope with the axial wear otherwise the paddle needs replacing.

Variable Area Flow Sensors also known as Rotaflow meters: identified by their tapered tube and float designs. 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 flow meter. The way to select the right flow meter 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 summation?
  • Display or signal output?
  • What is the minimum and maximum flow rate, process pressure and process temperature?

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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
New
RS Stock No. 213-3257
Mfr. Part No.FFUS10-1G1IO
BrandSick
$1,231.18
Each
units
- Flow Meter 0.3 l/min 21 L/min 18 → 30 V dc 10 mm G1/2 Male 16bar PPSU 0 °C +80°C 0°C +60°C 100 mA
RS Stock No. 616-3472
Mfr. Part No.197091
$81.66
Each
units
Liquid Piston - 0.25 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. 804-3894
Mfr. Part No.7MF4433-1FA22-2RB1
BrandSiemens
$5,629.32
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. 196-4460
Mfr. Part No.PF3W720-F04-ETN-M
BrandSMC
$1,199.20
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
New
RS Stock No. 218-9951
Mfr. Part No.AWM5103VA
BrandHoneywell
$316.44
Each
units
Air High Flow Mass 0 l/min 15 L/min 5 V - - - - - - - - -
RS Stock No. 256-281
Mfr. Part No.S.800001
BrandParker
$243.71
Each
units
Liquid Variable Area 0.2 L/min 2 L/min - 3/4 in 3/4 BSP 10bar - - - - +60°C -
RS Stock No. 185-9926
Mfr. Part No.EF.7731113291
BrandParker UCC
$706.77
Each
units
Liquid Variable Area 5 L/min 100 L/min 240 V ac 1 in 1 BSP Female 10bar PET - - +5°C +60°C -
RS Stock No. 901-0233
Mfr. Part No.198803329
$478.60
Each
units
Liquid Variable Area 100 L/h 1000 L/h - Maximum of 32 mm DN25 Socket - Plastic - - - - -
New
RS Stock No. 213-3258
Mfr. Part No.FFUS15-1G1IO
BrandSick
$1,286.12
Each
units
- Flow Meter 0.9 l/min 36 L/min 18 → 30 V dc 15 mm G3/4 Male 16bar PPSU 0 °C +80°C 0°C +60°C 100 mA
RS Stock No. 201-2074
Mfr. Part No.SFM3019
BrandSensirion
$3,946.86
1 Tray of 20
Tray(s)
- - - - - - - - - - - - - -
RS Stock No. 616-3488
Mfr. Part No.197092
$83.95
Each
units
Liquid Piston - 0.5 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. 198-2997
Mfr. Part No.25102A14BVBN
$257.92
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. 210-1287
Mfr. Part No.FTMG-ESD25AXO
BrandSick
$1,695.16
Each
units
Air, Argon, Carbon Dioxide, Helium, Nitrogen Gas 14.7 l/min 4417 L/min Power Over Ethernet - - - - - - - - -
RS Stock No. 122-8441
Mfr. Part No.51582
$486.40
Each
units
Liquid Piston - 0.1 gal/min - 1/4 in 1/4 NPT Female 69bar Brass - - -29°C +148.9°C -
RS Stock No. 395-7202
Mfr. Part No.020-3491
$485.75
Each
units
Liquid Shuttle 7.5 L/min 30 L/min 250 V 1 in 1 BSP 27bar Bronze - - -20°C +80°C -
RS Stock No. 456-3050
Mfr. Part No.SF5350
$367.11
Each
units
Gas, Liquid Modular Flow Monitoring 3 (Liquids) ccm/s, 200 (Gases) 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. 210-0725
Mfr. Part No.PF20S-11.010.T527.20.1.0000.0
BrandBaumer
$828.69
Each
units
Liquid FlexFlow Flow & Temperature Measurement Sensor 10 cm/s 400 cm/s 30 V dc - Compression - - - - - - -
RS Stock No. 210-0722
Mfr. Part No.PF20S-11.010.T445.23.0.0000.0
BrandBaumer
$897.79
Each
units
Liquid FlexFlow Flow & Temperature Measurement Sensor 10 cm/s 400 cm/s 30 V dc - M18 Sealing Cone - - - - - - -
RS Stock No. 201-7955
Mfr. Part No.HAFUHH0020L4AXT
BrandHoneywell
$297.68
Each
units
Air, Gas Digital 0 l/min 20 L/min 3 → 10 V dc - - - - - - - - -
RS Stock No. 201-7960
Mfr. Part No.HAFUHM0200L4AXT
BrandHoneywell
$303.46
Each
units
Air, Gas Digital 0 l/min 200 L/min 3 → 10 V dc - - - - - - - - -