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 198-2997
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 510-0616
BrandRS PRO
HK$2,046.45
單位
Gas, Liquid Piston Inline 0.5 L/min 3 L/min 200 V ac 8 mm 1/4 BSP Female 16bar Aluminium - +100°C - +120°C 1 A
RS庫存編號 446-8315
製造零件編號173940-C
HK$573.60
單位
Liquid Turbine 2 L/min 30 L/min 5 → 24 V dc 3/8 in 3/8 BSP 200psi Nylon 12 - - -20°C +100°C -
RS庫存編號 198-3029
製造零件編號FR2L10BVBN
HK$630.10
單位
Liquid Variable Area 10 ccm 100 cm³/min - 1/8 in 1/8 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 361-0256
製造零件編號FR5A53PI
HK$2,112.00
單位
Gas Variable Area 100 L/min 700 L/min - 1 in 1 NPT Female 6.89bar Acrylic - +65°C - +65°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
RS庫存編號 740-6449
製造零件編號SU9000
HK$10,190.90
單位
Liquid Ultrasonic 0 L/min 200 L/min 19 → 30 V dc - 1-1/4 BSP 16bar Aluminium Alloy -10 °C +80°C -10°C +60°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 198-2981
製造零件編號FR2A13BVBN
HK$714.08
單位
Gas Variable Area 0.1 L/min 1 L/min - 1/8 in 1/8 NPT Female 6.89bar Acrylic - +65°C - +65°C -
RS庫存編號 395-213
製造零件編號AWM5104VN
BrandHoneywell
HK$1,028.54
單位
Dry Gas Amplified 0 sLpm 20 SLPM 15 V dc - 1/4 NPT 50psi Plastic - - 0°C +50°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 198-3041
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 446-8309
製造零件編號173939-C
HK$596.59
單位
Liquid Turbine 1 L/min 15 L/min 5 → 24 V dc 3/8 in 3/8 BSP 200psi Nylon 12 - - -20°C +100°C -
RS庫存編號 510-0571
BrandRS PRO
HK$1,801.80
單位
Liquid Piston Inline 0.5 L/min 3 L/min 200 V ac 1/4 in 1/4 BSP 300bar Brass - +100°C - +120°C 1 A
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 623-7933
製造零件編號AWM720P1
BrandHoneywell
HK$1,079.00
單位
Dry Gas Compensated/Amplified - 200 SLPM 15 V dc 22 mm 4-Pin 25psi Plastic - - -25°C +85°C -
RS庫存編號 821-3904
製造零件編號HAFBLF0200C4AX5
BrandHoneywell
HK$761.70
單位
Dry Gas Amplified 0 sccm 200 sccm 5 V dc Maximum of 5.35 mm Tubing 25psi High Temperature Polymer - - -20°C +70°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 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 -