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?

...
Read more Read less

Filters

Viewing 21 - 40 of 321 products
Results per page
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. 361-0228
Mfr. Part No.2540A5L60PI
SGD513.45
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. 361-0206
Mfr. Part No.2530A4L71BVBN
SGD357.86
Each
units
Liquid Variable Area 1.5 L/min 20 L/min - 1/4 in 1/4 NPT Female 6.89bar Acrylic - +65°C - +65°C -
RS Stock No. 395-6940
Mfr. Part No.166701
SGD75.91
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. 906-8207
Mfr. Part No.168432
SGD259.82
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. 407-596
Mfr. Part No.AWM3300V
BrandHoneywell
SGD228.69
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. 198-3007
Mfr. Part No.25102A15BVBN
SGD161.33
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. 395-6906
Mfr. Part No.155425BSPP
SGD377.42
Each
units
Liquid RotorFlow Electronic 2 L/min 20 L/min 24 V dc 1/4 in 1/2 BSP Female 7bar Polypropylene -29 °C +82°C -29°C +80°C -
RS Stock No. 441-4879
Mfr. Part No.S.800004
BrandParker
SGD446.65
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
SGD148.04
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. 198-2931
Mfr. Part No.MR3A15BVBN
SGD147.63
Each
units
Gas Variable Area 1 L/min 10 L/min - 1/8 in 1/8 NPT Female 6.9bar Polycarbonate - +65°C - +65°C -
RS Stock No. 361-0234
Mfr. Part No.2540A5L61PI
SGD513.45
Each
units
Liquid Variable Area 5 L/min 75 L/min - 1 in 1 NPT Female 6.89bar Acrylic - +65°C - +65°C -
RS Stock No. 448-7445
Mfr. Part No.MR3A16BVBN
SGD143.72
Each
units
Gas Variable Area 2 L/min 30 L/min - 1/8 in 1/8 NPT Female 6.9bar Polycarbonate - +65°C - +65°C -
RS Stock No. 198-3029
Mfr. Part No.2510A2L10BVBN
SGD156.34
Each
units
Liquid Variable Area 10 ccm 100 cm³/min - 1/8 in 1/8 NPT Female 6.89bar Acrylic - +65°C - +65°C -
RS Stock No. 780-0289
Mfr. Part No.FSVPLC06
BrandCynergy3
SGD140.44
Each
units
Liquid In-line 0.6 L/min 80 L/min 5 V ac G1 1 BSP Female 8bar Brass - +85°C - +85°C -
RS Stock No. 198-2919
Mfr. Part No.MR3A14BVBN
SGD147.64
Each
units
Gas Variable Area 0.4 L/min 5 L/min - 1/8 in 1/8 NPT Female 6.9bar Polycarbonate - +65°C - +65°C -
RS Stock No. 123-7149
Mfr. Part No.SFM3000-200C
BrandSensirion
SGD187.33
Each
units
Gas Low Pressure Drop -200 slm 200 slm 5 V 22 mm 2-Wire I2C 1.3bar Epoxy, Gold, Polyurethane, PPE+PS Blend, Si, Si3n4, Siox, Stainless Steel (Annealed) -20 °C +80°C -20°C +80°C -
RS Stock No. 186-0049
Mfr. Part No.EF7731110220
BrandParker UCC
SGD346.23
Each
units
Liquid Variable Area 1 L/min 15 L/min - 1 in 1 BSP Female 10bar PET - - +5°C +60°C -
RS Stock No. 395-6861
Mfr. Part No.155481BSPP
SGD205.71
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. 395-7224
Mfr. Part No.020-3499
SGD550.58
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. 446-8315
Mfr. Part No.173940-C
SGD148.64
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 -