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 510-0644
BrandRS PRO
HK$2,585.12
單位
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庫存編號 395-6827
製造零件編號155420BSPP
HK$520.93
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 510-0622
BrandRS PRO
HK$2,046.45
單位
Gas, Liquid Piston Inline 1 L/min 5 L/min 200 V ac 8 mm 1/4 BSP Female 16bar Aluminium - +100°C - +120°C 1 A
RS庫存編號 256-297
製造零件編號S.800002
BrandParker
HK$962.18
單位
Liquid Variable Area 1.5 L/min 10 L/min - 3/4 in 3/4 BSP 10bar - - - - +60°C -
RS庫存編號 853-6370
製造零件編號HAFUHT0050L4AXT
BrandHoneywell
HK$1,134.29
單位
Gas Airflow Sensor 0 SLPM 50 SLPM 3 → 10 V dc - G-3/8 Female Threaded Fitting (Pneumatic), 6-Pin SIP Connector (Electrical) 60psi GR Thermoplastic Polymer (Housing) 0 °C +50°C -20°C +70°C -
RS庫存編號 407-574
製造零件編號AWM3100V
BrandHoneywell
HK$942.83
單位
Dry Gas Amplified -200 sccm 200 cm³/min 15 V dc 0.2 in - 25psi Plastic - - -25°C +85°C -
RS庫存編號 623-7911
製造零件編號AWM42300V
BrandHoneywell
HK$1,008.51
單位
Dry Gas Unamplified -1000 sccm 1000 cm³/s 15 V dc 0.246 in - 150psi Plastic - - -40°C +125°C -
RS庫存編號 256-281
製造零件編號S.800001
BrandParker
HK$710.58
單位
Liquid Variable Area 0.2 L/min 2 L/min - 3/4 in 3/4 BSP 10bar - - - - +60°C -
RS庫存編號 361-0206
製造零件編號FR4L71BVBN
HK$1,772.79
單位
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庫存編號 257-149
BrandRS PRO
HK$385.64
單位
Liquid Radial Flow Turbine 0.25 L/min 6.5 L/min 4.5 → 16 V dc 15 mm - 20bar Acetal Copolymer - - -40°C +70°C 10 mA
RS庫存編號 198-2896
製造零件編號MR3A12BVBN
HK$717.47
單位
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庫存編號 407-596
製造零件編號AWM3300V
BrandHoneywell
HK$921.97
單位
Dry Gas Amplified -1000 sccm 1000 cm³/min 15 V dc 0.2 in - 25psi Plastic - - -25°C +85°C -
RS庫存編號 198-2975
製造零件編號FR2A12BVBN
HK$714.08
單位
Gas, Liquid Variable Area 0.04 L/min 0.5 L/min - 1/8 in 1/8 NPT Female 7bar Acrylic - +65°C - +65°C -
RS庫存編號 448-7467
製造零件編號MR3A18BVBN
HK$570.63
單位
Gas Variable Area 10 L/min 100 L/min - 1/8 in 1/8 NPT Female 6.9bar Polycarbonate - +65°C - +65°C -
RS庫存編號 198-2919
製造零件編號MR3A14BVBN
HK$532.63
單位
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庫存編號 441-4879
製造零件編號S.800004
BrandParker
HK$724.03
單位
Liquid Variable Area 3 L/min 22 L/min - 3/4 in 3/4 BSP 10bar - - - - +60°C -
RS庫存編號 198-2997
製造零件編號FR2A14BVBN
HK$714.08
單位
Gas Variable Area 0.4 L/min 5 L/min - 1/8 in 1/8 NPT Female 6.89bar Acrylic - +65°C - +65°C -
RS庫存編號 361-0161
製造零件編號FR4L72BVBN
HK$1,629.63
單位
Gas Variable Area 14 L/min 140 L/min - 1/4 in 1/4 NPT Female 6.89bar Acrylic - +65°C - +65°C -
RS庫存編號 740-6424
製造零件編號SM7000
HK$4,790.43
單位
Liquid Magnetic-Inductive 0.2 L/min 50 L/min 19 → 30 V dc - 3/4 BSP 16bar PBT, Stainless Steel -20 °C +80°C -10°C +60°C -
RS庫存編號 914-8495
製造零件編號SPP-N118-1421-1-4-001
BrandSimex
HK$1,761.21
單位
Fluid, Gas Flow Counter - - 85 → 260 V ac - Screw 25kPa ABS, Fibreglass - - 0°C +50°C 4 → 20 mA