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. 144-9342
Mfr. Part No.850084
BrandXylem
$4,232.02
Each
units
Liquid Flow Meter 0.2 m/s 10 m/s 230 V ac - DN65 - - - - -20°C +60°C -
New
RS Stock No. 213-3259
Mfr. Part No.FFUS20-1G1IO
BrandSick
$1,389.91
Each
units
- Flow Meter 3.5 l/min 60 L/min 18 → 30 V dc 20 mm G1 Male 10bar PPSU 0 °C +80°C 0°C +60°C 100 mA
RS Stock No. 198-3007
Mfr. Part No.25102A15BVBN
$193.60
Each
units
Gas Variable Area 1 L/min 10 L/min - 1/8 in 1/8 NPT Female 6.89bar Acrylic - +65°C - +65°C -
RS Stock No. 395-7224
Mfr. Part No.020-3499
$765.94
Each
units
Liquid Paddle 15 L/min 125 L/min 250 V 1 in 1 BSP 55bar Stainless Steel - - -18°C +100°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. 901-0069
Mfr. Part No.198840143
$1,021.66
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. 196-4462
Mfr. Part No.PFM710-F01-F
BrandSMC
$441.80
Each
units
- Flow Switch 0.2 L/min 10 L/min 3.8 V - Rc 750kPa Brass, LCP, PBT 0 °C +50°C 0°C +50°C 55 mA
RS Stock No. 198-2953
Mfr. Part No.MR3L10BVBN
$169.25
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. 204-3916
Mfr. Part No.D6F-01N2-000
BrandOmron
$474.53
Each
units
Gas Gas 1 l/min 1 L/min 26.4 V dc - - - - - - - - -
New
RS Stock No. 217-3745
Mfr. Part No.FS2012-1100-NG
$158.003
Each (In a Tray of 10)
units
- - - - - - - - - - - - - -
RS Stock No. 744-0714
Mfr. Part No.PFM725S-C6-B-W
BrandSMC
$482.44
Each
units
Dry Air, Gas Integrated Display 0.5 L/min 25 L/min 24 V dc 6 mm One-Touch Fitting 750kPa PBT 0 °C +50°C 0°C +50°C -
RS Stock No. 210-0717
Mfr. Part No.PF20H-11.010.C043.20.1.0000.0
BrandBaumer
$1,135.42
Each
units
Liquid FlexFlow Hygienic Flow & Temperature Measurement Sensor 10 cm/s 400 cm/s 30 V dc - 1 1/2" Tri-Clamp - - - - - - -
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. 804-3901
Mfr. Part No.7MF4433-1HA22-2RB1
BrandSiemens
$5,895.45
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. 201-7953
Mfr. Part No.HAFBLF0200CAAX3
BrandHoneywell
$200.97
Each
units
Air, Gas Analog 1 l/min 10 L/min 3.3 V dc - - - - - - - - -
RS Stock No. 407-568
Mfr. Part No.AWM2300V
BrandHoneywell
$213.47
Each
units
Dry Gas Unamplified -1000 sccm 1000 cm³/min 15 V dc 0.2 in - 25psi Plastic - - -25°C +85°C -
RS Stock No. 510-0644
BrandRS PRO
$599.55
Each
units
Gas, Liquid Piston Inline 5 L/min 30 L/min 250 V ac 15 mm 1/2 BSP Female 50bar Nickel Plated Brass -20 °C +90°C -20°C +70°C 1 A
RS Stock No. 136-6376
Mfr. Part No.74P-VQB-O-RS
BrandAtrato
$1,487.33
Each
units
Liquid Ultrasonic 0.03 L/min 5 L/min 10 → 24 V dc 1/4 in 1/4 BSP 20bar 316 Stainless Steel (Wetted) - - -20°C +65°C 20 mA
RS Stock No. 740-6433
Mfr. Part No.SM8000
$1,537.53
Each
units
Liquid Magnetic-Inductive 0.2 L/min 100 L/min 19 → 30 V dc - 1 BSP 16bar PBT, Stainless Steel -20 °C +80°C -10°C +60°C -