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
RS Stock No. 204-3921
Mfr. Part No.D6F-30A7-000
BrandOmron
$634.21
Each
units
Air Air 1 l/min 30 L/min 26.4 V dc - - - - - - - - -
RS Stock No. 510-0559
BrandRS PRO
$418.55
Each
units
Liquid Piston Inline 0.04 L/min 0.13 L/min 200 V ac 1/4 in 1/4 BSP 300bar Brass - +100°C - +120°C 1 A
RS Stock No. 204-3928
Mfr. Part No.D6F-W10A1
BrandOmron
$16,128.35
1 Tray of 100
Tray(s)
Air Air 1 l/min 10 L/min 26.4 V dc - - - - - - - - -
RS Stock No. 198-3035
Mfr. Part No.1250AD6053ALAVB
$418.88
Each
units
Gas Variable Area 0.5 L/min 5 L/min - 1/8 in 1/8 NPT Female 13.7bar Borosilicate Glass - - - +93°C -
RS Stock No. 201-7962
Mfr. Part No.HAFUHT0015L4AXT
BrandHoneywell
$297.70
Each
units
Air, Gas Digital 0 l/min 15 L/min 3 → 10 V dc - - - - - - - - -
RS Stock No. 122-8445
Mfr. Part No.51598
$486.40
Each
units
Liquid Piston - 1 gal/min - 1/4 in 1/4 NPT Female 69bar Brass - - -29°C +148.9°C -
RS Stock No. 205-1294
Mfr. Part No.14272389
BrandWIKA
$841.32
Each
units
Liquid Electronic Flow Switch 5 cm/s 300 cm/s 15 → 35 V - - - - - - - - -
RS Stock No. 144-9341
Mfr. Part No.850083
BrandXylem
$2,722.59
Each
units
Liquid Flow Meter 0.2 m/s 10 m/s 230 V ac - DN50 - - - - -20°C +60°C -
RS Stock No. 203-6327
Mfr. Part No.AWM92100V
BrandHoneywell
$112.89
Each
units
Liquid Mass Air Flow -200 cc/m 200 cc/m 8 → 15 V dc - - - - - - - - -
RS Stock No. 200-9556
Mfr. Part No.LS32-1500 Liquid Flow Meter
BrandSensirion
$995.45
Each
units
Liquid Liquid Flow Meter 0.01 l/min 0.04 L/min 5 V - - - - - - - - -
RS Stock No. 740-6449
Mfr. Part No.SU9000
$2,314.45
Each
units
Liquid Ultrasonic 0 L/min 200 L/min 19 → 30 V dc - 1-1/4 BSP 16bar Aluminium Alloy -10 °C +80°C -10°C +60°C -
New
RS Stock No. 218-9955
Mfr. Part No.HAFBLF0400C4AX5
BrandHoneywell
$210.97
Each
units
Air Bidirectional Flow 0 l/min 0.4 L/min 5 V - - - - - - - - -
RS Stock No. 441-4879
Mfr. Part No.S.800004
BrandParker
$197.88
Each
units
Liquid Variable Area 3 L/min 22 L/min - 3/4 in 3/4 BSP 10bar - - - - +60°C -
RS Stock No. 725-9965
Mfr. Part No.UF25B100
BrandCynergy3
$537.08
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. 395-7016
Mfr. Part No.166703-A
$75.14
Each
units
Gas Piston - 158 L/min 120 → 240 V ac/dc 1/4 in 1/4 BSP 10bar Noryl - +100°C - +100°C -
RS Stock No. 901-0251
Mfr. Part No.198335426
$611.08
Each
units
Liquid Variable Area 60 L/h 6000 L/h - - DN40 Socket - Plastic - - - - -
RS Stock No. 198-2896
Mfr. Part No.MR3A12BVBN
$232.69
Each
units
Gas Variable Area 0.05 L/min 0.5 L/min - 1/8 in 1/8 NPT Female 6.9bar Polycarbonate - +65°C - +65°C -
RS Stock No. 286-298
Mfr. Part No.EF.7731114291
BrandParker
$698.05
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. 361-0228
Mfr. Part No.2540A5L60PI
$589.54
Each
units
Liquid Variable Area 4 L/min 36 L/min - 1 in 1 NPT Female 6.89bar Acrylic - +65°C - +65°C -