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 198-0676
製造零件編號FM.26 122 329
BrandParker UCC
HK$2,665.96
單位
Liquid Variable Area 1 L/min 9 L/min - 1/4 in 1/4 BSP - Brass - - - +90°C -
RS庫存編號 198-0698
製造零件編號FM.26 222 229
BrandParker
HK$3,125.42
單位
Liquid Variable Area 5 L/min 46 L/min - 1/2 in 1/2 BSP - Brass - - - +90°C -
RS庫存編號 198-0806
製造零件編號FS.643 322 229
BrandParker UCC
HK$7,683.07
單位
Liquid Boxed Two-Switch 10 L/min 110 L/min 250 V ac 3/4 in - 350bar Stainless Steel - - -20°C +90°C -
RS庫存編號 456-3050
製造零件編號SF5350
HK$1,651.71
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 361-0212
製造零件編號FR5L59PI
HK$2,300.14
單位
Liquid Variable Area 1 L/min 19 L/min - 1 in 1 NPT Female 6.89bar Acrylic - +65°C - +65°C -
RS庫存編號 198-2953
製造零件編號MR3L10BVBN
HK$567.67
單位
Liquid Variable Area 5 ccm 110 cm³/min - 1/8 in 1/8 NPT Female 6.9bar Polycarbonate - +65°C - +65°C -
RS庫存編號 198-3041
製造零件編號GR2-20 LPM AIR
HK$1,734.70
單位
Gas Variable Area 2 L/min 10 L/min - 1/8 in 1/8 NPT Female 13.7bar Borosilicate Glass - - - +93°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 906-9648
製造零件編號PUB-10
HK$47,352.67
單位
Liquid Portable Ultrasonic 0.1 m/s 20 m/s 9 → 24 V dc 13 → 115 mm - - ABS Plastic - - -20°C +135°C -
RS庫存編號 901-0236
製造零件編號199335425
HK$2,891.50
單位
Liquid Variable Area 300 l/h 3000 L/h - - DN40 Socket - Plastic - - - - -
RS庫存編號 448-7451
製造零件編號MR3A17BLBN
HK$570.63
單位
Gas Variable Area 4 L/min 50 L/min - 1/8 in 1/8 NPT Female 6.9bar Polycarbonate - +65°C - +65°C -
RS庫存編號 185-9982
製造零件編號S.900001
BrandParker
HK$513.00
單位
Liquid Variable Area 1 L/min 25 L/min 5 V dc 3/8 in 3/8 BSP 10bar - - - +5°C +50°C -
RS庫存編號 198-3035
製造零件編號GR 0.5-5LPM AIR
HK$1,734.70
單位
Gas Variable Area 0.5 L/min 5 L/min - 1/8 in 1/8 NPT Female 13.7bar Borosilicate Glass - - - +93°C -
RS庫存編號 173-2224
製造零件編號LG01-2000A005
BrandSensirion
HK$1,292.001
Each (In a Tray of 25)
單位
Liquid Liquid Flow Switch 250 (Isopropyl Alcohol) 220 (Water) ml/min, 250 (Isopropyl Alcohol) ml/min 5 → 12 V 9.2 mm 5 Pin PCB Header 3bar Borosilicate Glass (Tube Material), FEP (Sealing), PEEk (Fitting) - - +10°C +50°C 6.8 mA
RS庫存編號 198-0711
製造零件編號FM.26 322 229
BrandParker
HK$4,058.61
單位
Liquid Variable Area 10 L/min 110 L/min - 3/4 in 3/4 BSP - Brass - - - +90°C -
RS庫存編號 361-0278
製造零件編號FR5A55PI
HK$2,079.76
單位
Gas Variable Area 400 L/min 4000 L/min - 1 in 1 NPT Female 6.89bar Acrylic - +65°C - +65°C -
RS庫存編號 123-7149
製造零件編號SFM3000-200C
BrandSensirion
HK$877.90
單位
Gas Low Pressure Drop -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 898-6731
製造零件編號LG01-2000A090
BrandSensirion
HK$1,282.05
單位
Liquid Liquid Flow Switch 250 (Isopropyl Alcohol) 50 (Water) ml/min, 250 (Isopropyl Alcohol) ml/min 5 → 12 V 9.2 mm 5 Pin PCB Header 3bar Borosilicate Glass (Tube Material), FEP (Sealing), PEEk (Fitting) - - +10°C +50°C 6.8 mA
RS庫存編號 123-7150
製造零件編號SFM3000-200
BrandSensirion
HK$886.88
單位
Gas Low Pressure Drop -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 906-9720
製造零件編號RMB-55-SSV
HK$638.38
單位
Air Variable Area 40 SCFH 400 SCFH - 1/4 in 1/4 NPT Female 6.9bar Polycarbonate - - - +54°C -