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 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 907-3978
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 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 286-276
製造零件編號EF77311142220
BrandParker
HK$1,444.26
單位
Liquid Variable Area 10 L/min 150 L/min - 1 in 1 BSP Female 10bar PET - - +5°C +60°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 906-8327
製造零件編號197082
HK$556.09
單位
Liquid Piston - 0.5 gal/min - 3/8 in 3/8 NPT 8.6bar Glass Reinforced Polypropylene - +21°C -18°C +100°C -
RS庫存編號 906-8074
製造零件編號122357
HK$1,059.64
單位
Liquid Piston - 1.5 gal/min 240 V ac 9/16 in 9/16-18 UNF-2B 17.2bar Ryton® R4 - +21°C -17°C +107°C -
RS庫存編號 181-0652
製造零件編號E8FC-25
BrandOmron
HK$6,336.75
單位
Liquid Flow Sensor 0.6 (Nominal Diameter B 3/8 in) L/min, 1 (Nominal Diameter B 1/2 in) L/min, 1.5 (Nominal Diameter B 3/4 in) L/min, 2 (Nominal Diameter B 1 in) L/min 14 (Nominal Diameter B 3/8 in) L/min, 30 (Nominal Diameter B 1/2 in) L/min, 60 (Nominal Diameter B 3/4 in) L/min, 100 (Nominal Diameter B 1 in) L/min 15 → 30 V dc 9.525 mm, 12.7 mm, 19.05 mm, 25.4 mm M12 4 Pole Connector 10MPa Chassis), FKM (O-Ring), PBT (Button), PES (Display Unit), PPSU (Head), SUS304 (Nut), SUS304L (Detecting Unit 0 °C +85°C -20°C +80°C 192 mA
RS庫存編號 395-6861
製造零件編號155481BSPP
HK$913.08
單位
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庫存編號 740-6430
製造零件編號SU8000
HK$6,315.50
單位
Liquid Ultrasonic 0 L/min 100 L/min 19 → 30 V dc - 1 BSP 16bar Aluminium Alloy -10 °C +80°C -10°C +60°C -
RS庫存編號 510-0559
BrandRS PRO
HK$1,713.33
單位
Liquid Piston Inline 0.04 L/min 0.13 L/min 200 V ac 1/4 in 1/4 BSP 300bar Brass - +100°C - +120°C 1 A
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 889-1087
製造零件編號LM53-2800
BrandFlowline
HK$485.78
單位
- Reducer Bushing - - - 2 x 1.5 in NPT - - PVC - - - - -
RS庫存編號 907-3928
製造零件編號70824
HK$1,008.11
單位
Liquid Piston - 1 gal/min - 1/4 in 1/4 NPT Female 69bar Brass - - -29°C +93.3°C -
RS庫存編號 906-9730
製造零件編號RMB-85-SSV
HK$638.38
單位
Liquid Variable Area 10 gal/h 100 gal/h - 1/4 in 1/4 NPT Female 6.9bar Polycarbonate - - - +54°C -
RS庫存編號 181-0597
製造零件編號E8PC-YA-A38
BrandOmron
HK$846.71
單位
- Adapter - - - - R 3/8 Male - SUS304 - - -20°C +80°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 144-9342
製造零件編號850084
BrandXylem
HK$14,661.37
單位
Liquid Flow Meter 0.2 m/s 10 m/s 230 V ac - DN65 - - - - -20°C +60°C -
RS庫存編號 906-7655
製造零件編號RMC-145
HK$1,084.65
單位
Liquid Variable Area 1.2 gal/min 10 gal/min - 1/2 in 1/2 NPT Female 6.9bar Polycarbonate - - - +54°C -
RS庫存編號 906-8086
製造零件編號129660
HK$912.79
單位
Liquid Piston - 0.5 gal/min - 1/2 in 1/2 NPT Male 13.8bar Polypropylene +21.1 °C +65.5°C -17.8°C +100°C -