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 821-3897
製造零件編號HAFBLF0050CAAX5
BrandHoneywell
HK$849.03
單位
Dry Gas Amplified 0 sccm 50 sccm 5 V dc Maximum of 5.35 mm Tubing 25psi High Temperature Polymer - - -20°C +70°C -
RS庫存編號 136-6376
製造零件編號74P-VQB-O-RS
BrandAtrato
HK$7,210.34
單位
Liquid Ultrasonic 0.03 L/min 5 L/min 10 → 24 V dc 1/4 in 1/4 BSP 20bar 316 Stainless Steel (Wetted) - - -20°C +65°C 20 mA
RS庫存編號 361-0199
製造零件編號FR4L69BVBN
HK$1,908.97
單位
Liquid Variable Area 0.8 L/min 9 L/min - 1/4 in 1/4 NPT Female 6.89bar Acrylic - +65°C - +65°C -
RS庫存編號 146-2582
製造零件編號SFM3000-200
BrandSensirion
HK$786.565
Each (In a Tray of 20)
單位
Gas Flow Meter -200 slm 200 slm 5 V 22 mm 2-Wire I2C 1.3bar Epoxy, Gold, Polyurethane, PPE+PS Blend, Si, Si3n4, Siox, Stainless Steel (Annealed) -20 °C +80°C -20°C +80°C -
RS庫存編號 907-3993
製造零件編號165077
HK$3,409.97
單位
Liquid RotorFlow Electronic 1.5 gal/min 20 gal/min 24 V dc 1/2 in 1/2 NPT Female 13.8bar Stainless Steel - +21°C -29°C +100°C 20 mA @ 24 V dc (No Load), 35 mA @ 24 V dc (Load)
RS庫存編號 395-6833
製造零件編號155480BSPP
HK$510.26
單位
Liquid RotorFlow 15 L/min 75 L/min - 1/2 in 1/2 BSP Female 6.9bar Polypropylene -29 °C +82°C -29°C +82°C -
RS庫存編號 914-8491
製造零件編號SPI-N118-1421-1-4-001
BrandSimex
HK$2,401.93
單位
Fluid, Gas Flow Counter - - 85 → 260 V ac - Screw - ABS, Fibreglass - - 0°C +50°C 12 mA
RS庫存編號 123-7148
製造零件編號ASF1430
BrandSensirion
HK$2,386.78
單位
Air, Gas Flow Meter -400 sccm 400 sccm 7 → 18 V dc 5 mm RS-232, SPI 2bar PBT 0 °C +60°C 0°C +70°C 19 mA
RS庫存編號 849-9442
製造零件編號PFMV510-1-A
BrandSMC
HK$2,461.16
單位
Dry Air, Gas Flow Sensor 0 L/min 1 L/min 12 → 24 V dc - - 500kPa PPS 0 °C +50°C 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 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 906-8282
製造零件編號179995
HK$2,886.45
單位
Liquid Piston - 1.5 gal/min - 3/8 in 3/8 NPT Male 107bar Stainless Steel - - -28.8°C +135°C -
RS庫存編號 907-3997
製造零件編號173138
HK$1,941.09
單位
Fluid, Liquid RotorFlow 1.5 gal/min 20 gal/min - 1/2 in 1/2 NPT Female 13.8bar Stainless Steel - +21°C -29°C +100°C -
RS庫存編號 286-260
製造零件編號EF.7731111290
BrandParker
HK$1,444.26
單位
Liquid Variable Area 2 L/min 30 L/min - 1 in 1 BSP Female 10bar PET - - +5°C +60°C -
RS庫存編號 144-9340
製造零件編號85 04 63
BrandXylem
HK$20,171.26
單位
Liquid Flow Meter 0.2 m/s 10 m/s 230 V ac - DN45 - - - - -20°C +60°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 907-4031
製造零件編號173935-C
HK$1,206.66
單位
Liquid Turbine 1 l/min 25 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 511-3971
BrandRS PRO
HK$4,256.18
單位
Liquid Turbine 0.5 L/min 15 L/min 4.5 → 24 V dc 1/2 in 1/2 BSP 10bar Stainless Steel - - -25°C +125°C -
RS庫存編號 181-0596
製造零件編號E8PC-YA-A14
BrandOmron
HK$846.71
單位
- Adapter - - - - R 1/4 Male - SUS304 - - -20°C +80°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 -