Variable Area Flow Meter & Quantity Flow Meters

Variable Area Flow Meter


Rotameter ko variable area flowmeter bhi kehte hain. Rotameter ek akela aisa flow meter hai jo flow ka visual indication deta hai. Isko vertically install kiya jata hai. Isme pressure drop constant rehta hai aur isi pressure drop ke zarie liquid, gas aur vapour ka flow measure kiya jata hai. Rotameters glass ke bane hue hote hain aur is glass ke andar ek float hoti hai  kyuki isme flow neeche se upar ki taraf hota hai to flow ke aane par upar ki side badhti hai, flow ke na aane par ye float inlet section ko poori tarah se cover (band) kar deta hai. Rotameters ki accuracy 0.5%  se 10% hoti hai. Inka installation asan hota hai aur inki cost bhi moderate (average) hoti hai.

Quantity Type Flowmeter

Quantity flow meters ka istemal low percentage ke flow rates ke measurement ke lie kiya jata hai.  In flowmeters me liquid ko alternatively bharte aur khaali karne ke increments me meter ke zarie measure kiya jata hai. Jitni baar meter bharta hai aur khaali hota hai, wo flow ke rate ko show karta hai.

Quantity  flow meters do types ke hote hain:-

1)  Positive Displacement Meters

2)Metering Pump

Positive Displacement Meters

Inka istemal us jagah sabse zyada kiya jata hai jahan  highest degree of accuracy aur good repeatability ki zarurat hoti hai. Ye flowmeters is principle par work karte hain ki jab inme flow aata hai to ye unko volumetric increments me separate kar deta hai aur inko count kar liya jata hai.

Positive Displacement Meters ke paanch types hote hain:-

1) Nutating Disk Meter

2) Oscillating Piston Meter

3) Rotating Vane Meter

4) Lobed Impeller

5) Reciprocating Piston Meter

Nutating Disk Meter

Nutating Disk flowmeter residential houses me water service measurement me istemal hota hai sath hi ise different different industrial applications ke lie bhi istemal kiya ja sakta hai. Isme ek ball bearing hoti hai jispar ek disk mount ( lagi) ki jati hai jo ki half circular chamber me ghumti (nutate) karti hai.  Metering chamber me disc fit ki gai hoti hai jo ise char volumes me divide kar deta hai, jinme do inlet side me hote hain aur do outlet side me hote hain. Inki cost generally zyada nahi hoti hai aur inki accuracy ±1% se ±2% tak hoti hai aur inka pressure loss bhi moderate (average ) hoti hai.

 Oscillating Piston Meter

Oscillating Piston Meter ki working lagbah Nutating Disk Meter ke jaise hi hoti hai bas fark sirf itna hota  hai ki isme measurement ke lie split ring ka istemal hota hai jo ki sirf ek hi plane me oscillate karti hai.  Oscillating Piston Meter ka istemal 50 mm ya use chhoti pipelines me low flow rates ke measurement ke lie kiya jata hai.  Is type ke meters ka faida ye hota hai ye clean viscous aur corrosive liquids ko handle karne ki power hoti hai.  Inki accuracy ±1% tak hoti hai aur inki price range inke material of contruction aur size par depend karti hai. Inki maintenance aur installation kaafi easy hoti hai aur inki repeatability bhi achi hoti hai.

Rotating Vane Meters

Rotating vane maters ka istemal petroleum industries me sabse zyada kiya jata hai. Iski madad se gasoline aur crude oil ki metering ki jati hai. Isme ek rotor laga hota hai jo ki revolve karta hai ball bearing par around stationary cam aur central shaft. Is tarah ke meters ki accuracy bahut achi hoti hai i.e. ±0.1 se ±0.5% tak hoti hai aur ye 400 mm ke sizes tak available hote hain. Ye meters variety of materials ke construction me available hote hain aur inko high temperature aur pressure services me bhi istemal kiya ja sakta hai inki temperature ki upper limit 177°C aur upper pressure limit 1000psig tak hoti hai.

Lobed Impeller Meters

Inka zyadatar istemal petroleum crude aur finished products ki measuring aur controlling me hota hai. Ye do lobed impellers se milkar bana hua hota hai jo ek doosre se geared hote hote hain ek fixed relative position maintain karne ke lie aur ye dono hi impellers ek doosre ke opposite ke direction me rotate karte hai housing ke andar. Aaj kal gears ki lobed ki jagah oval  bhi istemal kie jate hain. Inka istemal gases aur liquids dono hi  ke lie kiya ja sakta hai. Iska faeda ye hai ki isme variety of sizes mil jate hain jo ki 50mm se 610mm tak hote hain aur inki accuracy bhi bahut achi hoti hai jo ki ±0.1% se ±0.5% tak hoti hai.

Reciprocating Piston  Meter

Iska sabse zyada istemal petroleum industries me kiya jata hai aur ye positive displacement type ka sabse purana meter hai. Iska construction bahut similar hota hai reciprocating steam engine piston ya cylinder ke. Ye bana hua hota hai cast iron ke cylinder se jo ki fit hota hai piston ke sath. Reciprocating Piston Meter kai other forms me bhi available hote hain jaise multi pistons meter, double acting piston meters, rotary valves, aur horizontal slide valves. Ye meters bhi bahut accurate hote hain  inki accuracy ±0.2% se ±0.3% tak hoti hai. Lekin ye cost me bahut high hote hain aur inki maintenance bhi costly hoti hai.

About Mohd Mustaqeem Siddiqui

You can contact me for any ITI related information and for any query on ITI Electronic or Instrument Mechanic.

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35 Comments on “Variable Area Flow Meter & Quantity Flow Meters”

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