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 456-3066
製造零件編號SF5200
HK$1,541.33
單位
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庫存編號 181-0603
製造零件編號E8PC-YS-N
BrandOmron
HK$260.95
單位
- Throttle - - - - M6 x 0.75 - SUS304 - - -20°C +80°C -
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 395-6912
製造零件編號155485BSPP
HK$2,012.07
單位
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庫存編號 181-0609
製造零件編號E8PC-100T-E
BrandOmron
HK$5,058.54
單位
Liquid Flow Sensor 0 MPa 10 MPa 10 → 30 V dc G3/4 Male in M12 4 Pole Connector 10MPa Al2O3 ((alumina) Diaphragm Pressure Port), FKM (O-Ring), PBT (Button), PES (Display Unit), PPSU (Head), SUS304L (Chassis), SUS304L (Pressure Port) -20 °C +100°C -20°C +80°C 120 mA
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 906-7790
製造零件編號VFB-52
HK$559.26
單位
Air Variable Area 4 SCFH 40 SCFH - 1/8 in 1/8 NPT Female 6.9 (With Valve) bar, 10 (Without Valve) bar Acrylic Plastic - +38 (Without Valve) °C, +48 (With Valve) °C - - -
RS庫存編號 849-9439
製造零件編號PFMV505-1
BrandSMC
HK$1,380.61
單位
Dry Air, Gas Suction 0 L/min 0.5 L/min 12 → 24 V dc 4 mm One-Touch Fitting 500kPa PPS 0 °C +50°C 0°C +50°C -
RS庫存編號 395-184
製造零件編號AWM5101VN
BrandHoneywell
HK$1,194.75
單位
Dry Gas Amplified 0 sLpm 5 SLPM 15 V dc - 1/4 NPT 50psi Plastic - - 0°C +50°C -
RS庫存編號 181-0600
製造零件編號E8PC-YA-C18
BrandOmron
HK$846.71
單位
- Adapter - - - - NPT 1/8 Male - SUS304 - - -20°C +80°C -
RS庫存編號 186-0027
製造零件編號EF.7731113290
BrandParker
HK$1,442.63
單位
Liquid Variable Area 5 L/min 100 L/min - 1 in 1 BSP Female 10bar PET - - +5°C +60°C -
RS庫存編號 804-3917
製造零件編號7MF4433-1EA22-2RB1
BrandSiemens
HK$16,640.09
單位
Gas, Liquid, Vapour Digital Pressure Transmitter - - 9 → 24 V - 1/4 NPT 0.6bar Aluminium -40 °C +85°C -40°C +85°C -
RS庫存編號 186-0055
製造零件編號EF.7731112291
BrandParker UCC
HK$2,654.31
單位
Liquid Variable Area 4 L/min 50 L/min 240 V ac 1 in 1 BSP Female 10bar PET - - +5°C +60°C -
RS庫存編號 906-7774
製造零件編號VFA-3-SSV
HK$579.20
單位
Air Variable Area 0.6 SCFH 5 SCFH - 1/8 in 1/8 NPT Female 6.9 (With Valve) bar, 10 (Without Valve) bar Acrylic Plastic - +38 (Without Valve) °C, +48 (With Valve) °C - - -
RS庫存編號 804-3904
製造零件編號7MF4433-1BA22-2RB1
BrandSiemens
HK$17,091.85
單位
Gas, Liquid, Vapour Digital Pressure Transmitter - - 9 → 24 V - 1/4 NPT 0.02bar Aluminium -40 °C +85°C -40°C +85°C -
RS庫存編號 136-6374
製造零件編號710-V10-D-RS
BrandAtrato
HK$7,328.92
單位
- - - - - - - - - - - - - -
RS庫存編號 198-3007
製造零件編號FR2A15BVBN
HK$795.75
單位
Gas Variable Area 1 L/min 10 L/min - 1/8 in 1/8 NPT Female 6.89bar Acrylic - +65°C - +65°C -
RS庫存編號 136-6375
製造零件編號760-V10-D-RS
BrandAtrato
HK$7,328.92
單位
- - - - - - - - - - - - - -
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 616-3494
製造零件編號197093
HK$388.65
單位
Liquid Piston - 1 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 -