Flow Sensors & Indicators

Flow sensors and flow indicators are flowmeter 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, that 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 Sensors and Indicators


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 large-capacity measurement. Disadvantages are clogging and maintenance is required to cope with the axial wear otherwise the paddle needs replacing.


Rotaflow or Variable Area Flow Sensors: Rotaflow meters are a tapered tube and a float. It is most 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 flowmeter. The way to select the right flowmeter 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 totalisation?

  • Display or signal output?

  • What is the minimum and maximum flowrate, process pressure and process temperature?

  • Size of the pipe

...
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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庫存編號 395-6827
製造零件編號155420BSPP
HK$578.66
單位
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庫存編號 446-8315
製造零件編號173940-C
HK$795.68
單位
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庫存編號 446-8286
製造零件編號173936-C
HK$620.37
單位
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庫存編號 446-8292
製造零件編號173037-C
HK$739.92
單位
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庫存編號 446-8309
製造零件編號173939-C
HK$596.59
單位
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庫存編號 395-6849
製造零件編號142541BSPP
HK$1,056.12
單位
Liquid RotorFlow 2 L/min 20 L/min - 1/4 in 1/4 BSP Female 13.8bar Brass - - -29°C +100°C -
RS庫存編號 395-6906
製造零件編號155425BSPP
HK$2,012.07
單位
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庫存編號 906-8430
製造零件編號216445
HK$556.09
單位
Liquid Piston - 0.08 gal/min - 3/8 in 3/8 NPT 8.6bar Glass Reinforced Polypropylene - +21°C -18°C +100°C -
RS庫存編號 616-3466
製造零件編號216446
HK$388.65
單位
Liquid Piston - 0.07 gal/min 200 V 1/4 in 1/4 Quick Disconnect Male 8.6bar Glass Reinforced PP -18 °C +100°C -18°C +100°C -
RS庫存編號 907-4003
製造零件編號173931-C
HK$1,206.66
單位
Liquid Turbine 0.5 l/min 5 L/min 5 → 24 V dc 3/8 in 3/8 NPT Male 13.7bar Nylon 12 - - -20°C +100°C 8 mA
RS庫存編號 907-3959
製造零件編號155420
HK$545.94
單位
Fluid, Liquid RotorFlow 0.1 gal/min 5 gal/min - 1/4 in 1/4 NPT Female 6.9bar Polypropylene - +21°C -29°C +82°C -
RS庫存編號 907-3748
製造零件編號26615
HK$2,175.69
單位
Liquid Shuttle 1 gal/min 6 gal/min - 1 in 1 NPT Female 27.6bar Bronze, Stainless Steel - +37.8°C -29°C +93.3°C -
RS庫存編號 906-8207
製造零件編號168432
HK$1,122.63
單位
Liquid Piston - 0.25 gal/min - 3/8 in 3/8 NPT Male 107bar Brass - - -28.8°C +135°C -
RS庫存編號 395-6928
製造零件編號156265BSPP
HK$2,404.34
單位
Liquid RotorFlow Electronic 2 L/min 20 L/min 24 V dc - 1/4 BSP Female 14bar Brass -29 °C +100°C -29°C +100°C -
RS庫存編號 616-3488
製造零件編號197092
HK$388.65
單位
Liquid Piston - 0.5 gal/min 200 V 1/4 in 1/4 Quick Disconnect Male 8.6bar Glass Reinforced PP -18 °C +100°C -18°C +100°C -
RS庫存編號 907-3773
製造零件編號26941
HK$2,401.91
單位
Gas, Liquid Piston - 0.045 gal/min - 1/4 in 1/4 NPT Female 69bar Brass - - -29°C +148.9°C -
RS庫存編號 907-3947
製造零件編號142541
HK$1,521.42
單位
Fluid, Liquid RotorFlow 0.1 gal/min 5 gal/min - 1/4 in 1/4 NPT Female 13.8bar Brass - +21°C -29°C +100°C -
RS庫存編號 907-4016
製造零件編號173932-C
HK$1,185.57
單位
Liquid Turbine 1 l/min 10 L/min 5 → 24 V dc 3/8 in 3/8 NPT Male 13.7bar Nylon 12 - - -20°C +100°C 8 mA
RS庫存編號 907-3978
製造零件編號155485
HK$2,061.75
單位
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庫存編號 906-8342
製造零件編號197094
HK$556.09
單位
Liquid Piston - 1.5 gal/min - 1/4 in 1/4 QDC 8.6bar Glass Reinforced Polypropylene - +21°C -18°C +100°C -