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. 831-163
Mfr. Part No.FM.26 222 119
BrandParker
PHP28,267.89
Each
units
- - - - - - - - - - - - - -
RS Stock No. 198-0660
Mfr. Part No.FM.26 122 129
BrandParker
PHP23,707.71
Each
units
Liquid Variable Area 0.2 L/min 2 L/min - 1/4 in 1/4 BSP - Brass - - - +90°C -
RS Stock No. 125-0660
Mfr. Part No.SPI-N118-1421-1-3-001
BrandSimex
PHP16,540.45
Each
units
Gas, Liquid Flow Counter - - 24 V dc - M12 - ABS, Fibreglass - - 0°C +50°C 100 mA
RS Stock No. 831-185
Mfr. Part No.FM.26.322 219
BrandParker
PHP36,622.37
Each
units
- - - - - - - - - - - - - -
RS Stock No. 361-0206
Mfr. Part No.2530A4L71BVBN
PHP14,219.72
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. 395-7230
Mfr. Part No.020-3497
PHP19,394.41
Each
units
Liquid Paddle 15 L/min 125 L/min 250 V 1 in 1 BSP 55bar Brass - - -18°C +100°C -
RS Stock No. 914-8495
Mfr. Part No.SPP-N118-1421-1-4-001
BrandSimex
PHP15,395.80
Each
units
Fluid, Gas Flow Counter - - 85 → 260 V ac - Screw 25kPa ABS, Fibreglass - - 0°C +50°C 4 → 20 mA
RS Stock No. 395-7224
Mfr. Part No.020-3499
PHP23,225.76
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. 511-4772
BrandRS PRO
PHP2,849.72
Each
units
Liquid Beverage 0.6 L/min 10 L/min 4.5 → 24 V dc 43315 in 3/8 Push On 10bar PVDF - - 0°C +125°C 10 mA
RS Stock No. 456-3066
Mfr. Part No.SF5200
PHP15,358.15
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. 198-2931
Mfr. Part No.MR3A15BVBN
PHP5,860.02
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. 831-179
Mfr. Part No.FM.26 322 119
BrandParker
PHP34,881.56
Each
units
- - - - - - - - - - - - - -
RS Stock No. 256-281
Mfr. Part No.S.800001
BrandParker
PHP7,207.45
Each
units
Liquid Variable Area 0.2 L/min 2 L/min - 3/4 in 3/4 BSP 10bar - - - - +60°C -
RS Stock No. 780-0273
Mfr. Part No.FSP10A30
BrandCynergy3
PHP6,252.27
Each
units
Liquid In-line - 80 L/min 250 V ac G1 1 BSP 8bar Brass/Polyamide - +85°C - +85°C 10 A
RS Stock No. 198-2896
Mfr. Part No.MR3A12BVBN
PHP7,083.12
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. 395-7195
Mfr. Part No.020-3489
PHP16,875.86
Each
units
Liquid Shuttle 3 L/min 22.5 L/min 250 V 1 in 1 BSP 27bar Bronze - - -20°C +80°C -
RS Stock No. 361-0228
Mfr. Part No.2540A5L60PI
PHP19,047.35
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. 613-4244
BrandRS PRO
PHP12,461.23
Each
units
Gas, Liquid Paddle 14 L/min 18 L/min 250 V ac 25 mm 1 BSP Female 25bar Nickel Plated Brass - +110°C - +110°C 5 A
RS Stock No. 198-2981
Mfr. Part No.25102A13BVBN
PHP5,919.99
Each
units
Gas Variable Area 0.1 L/min 1 L/min - 1/8 in 1/8 NPT Female 6.89bar Acrylic - +65°C - +65°C -
RS Stock No. 780-0282
Mfr. Part No.FSVPLC30
BrandCynergy3
PHP5,211.41
Each
units
Liquid In-line - 80 L/min 5 V ac G1 1 BSP Female 8bar Brass - +85°C - +85°C -