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. 446-8292
Mfr. Part No.173037-C
TWD3,152.00
Each
units
Liquid Turbine 1 L/min 10 L/min 5 → 24 V dc 3/8 in 3/8 BSP 200psi Nylon 12 - - -20°C +100°C -
RS Stock No. 395-6912
Mfr. Part No.155485BSPP
TWD7,766.00
Each
units
Liquid RotorFlow Electronic 15 L/min 75 L/min 24 V dc 1/2 in 1/2 BSP Female 6.9bar Polypropylene -29 °C +82°C -29°C +82°C -
RS Stock No. 907-3978
Mfr. Part No.155485
TWD10,282.00
Each
units
Liquid RotorFlow Electronic 1.5 gal/min 20 gal/min 24 V dc 1/2 in 1/2 NPT Female 6.9bar Polypropylene - +21°C -29°C +82°C 20 mA @ 24 V dc (No Load), 35 mA @ 24 V dc (Load)
RS Stock No. 907-3969
Mfr. Part No.155481
TWD6,381.00
Each
units
Liquid RotorFlow Electronic 1.5 gal/min 20 gal/min 4.5 → 24 V dc 1/2 in 1/2 NPT Female 6.9bar Ploypropylene - +21°C -29°C +82°C 8 mA
RS Stock No. 446-8315
Mfr. Part No.173940-C
TWD3,202.00
Each
units
Liquid Turbine 2 L/min 30 L/min 5 → 24 V dc 3/8 in 3/8 BSP 200psi Nylon 12 - - -20°C +100°C -
RS Stock No. 446-8286
Mfr. Part No.173936-C
TWD3,202.00
Each
units
Liquid Turbine 0.5 L/min 5 L/min 5 → 24 V dc 3/8 in 3/8 BSP 200psi Nylon 12 - - -20°C +100°C -
RS Stock No. 446-8309
Mfr. Part No.173939-C
TWD3,152.00
Each
units
Liquid Turbine 1 L/min 15 L/min 5 → 24 V dc 3/8 in 3/8 BSP 200psi Nylon 12 - - -20°C +100°C -
RS Stock No. 395-6827
Mfr. Part No.155420BSPP
TWD2,653.00
Each
units
Liquid RotorFlow Electronic 2 L/min 20 L/min - 1/4 in 1/4 BSP Female 6.9bar Polypropylene -29 °C +82°C -29°C +82°C -
RS Stock No. 395-7173
Mfr. Part No.020-0315
TWD5,113.00
Each
units
Liquid Piston 0 L/min 55 L/min 220 V 3/8 in 3/8 BSP 0.3bar Brass - - - +90°C -
RS Stock No. 395-6861
Mfr. Part No.155481BSPP
TWD4,362.00
Each
units
Liquid RotorFlow Electronic 15 L/min 75 L/min 4.5 → 24 V dc 1/2 in 1/2 BSP Female 6.9bar Polypropylene -29 °C +82°C -29°C +82°C -
RS Stock No. 395-7202
Mfr. Part No.020-3491
TWD9,357.00
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. 395-7016
Mfr. Part No.166703-A
TWD1,610.00
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. 395-6940
Mfr. Part No.166701
TWD1,875.00
Each
units
Liquid Piston - 0.2 L/min 120 → 240 V ac/dc 1/4 in 1/4 BSP 10bar Noryl - +100°C - +100°C -
RS Stock No. 395-6855
Mfr. Part No.155421BSPP
TWD4,362.00
Each
units
Liquid RotorFlow Electronic 2 L/min 20 L/min 4.5 → 24 V dc 1/4 in 1/4 BSP Female 6.9bar Polypropylene -29 °C +82°C -29°C +82°C -
RS Stock No. 907-3953
Mfr. Part No.155421
TWD6,574.00
Each
units
Liquid RotorFlow Electronic 0.1 gal/min 5 gal/min 4.5 → 24 V dc 1/4 in 1/4 NPT Female 6.9bar Ploypropylene - +21°C -29°C +82°C 8 mA
RS Stock No. 122-8440
Mfr. Part No.26602
TWD7,828.00
Each
units
Liquid Adjustable Shuttle 7 gal/min 14 gal/min - 3/4 in 3/4 NPT Female 27.6bar Bronze - - -29°C +82.2°C -
RS Stock No. 906-8207
Mfr. Part No.168432
TWD2,864.00
Each
units
Liquid Piston - 0.25 gal/min - 3/8 in 3/8 NPT Male 107bar Brass - - -28.8°C +135°C -
RS Stock No. 907-3956
Mfr. Part No.142542
TWD4,002.00
Each
units
Fluid, Liquid RotorFlow 1.5 gal/min 20 gal/min - 1/2 in 1/2 NPT Female 13.8bar Brass - +21°C -29°C +100°C -
RS Stock No. 907-3993
Mfr. Part No.165077
TWD11,273.00
Each
units
Liquid RotorFlow Electronic 1.5 gal/min 20 gal/min 24 V dc 1/2 in 1/2 NPT Female 13.8bar Stainless Steel - +21°C -29°C +100°C 20 mA @ 24 V dc (No Load), 35 mA @ 24 V dc (Load)
RS Stock No. 122-8442
Mfr. Part No.51586
TWD9,164.00
Each
units
Liquid Piston - 0.25 gal/min - 1/4 in 1/4 NPT Female 69bar Brass - - -29°C +148.9°C -