PFB220 Type: Area Flowmeter | Rotameter

PFB220 Type: Area Flowmeter | Rotameter

Area Flowmeter | For Gas Liquids | Acrylic Flowmeter | Economical

Description

  • Fluid Type:gas and liquid.
  • Wetted parts material:Acrylic Body Plastic O-Ring - NBR, Float - SS316
  • Valve material:SS316L
  • Connection size:M5 (male) & 1/4" (female)
  • Install:vertical position
  • Maximum pressure:150 Psig (10 bar) at 38°C (100°F).
  • Maximum temperature: ~+70℃
  • Accuracy:±3% of full scale

structure

Area flow meterThe structure is shown in the figure: It is mainly composed of a transparent plastic cone tube with the small end down and the big end up and the float that can move up and down in the cone tube as the measuring element, which is composed of nuts, nozzles, stoppers and "O" rings. . When the fluid flows from bottom to top in the conical tube, a pressure difference is generated up and down the float, which makes the float rise. When the pressure difference is in force balance with the gravity, buoyancy and viscous force of the float, the float is in a static position. When the flow rate changes , the flow velocity of the fluid flowing through the annular gap between the cone tube and the float changes, the pressure difference between the upper and lower floats changes accordingly, and the float moves up and down, so the height of the float at the static position can be used as a measure of flow.

Install

(1) Before installation, take out the smooth support in the instrument with needle-nose pliers, and then re-install it. When installing, pay attention to whether the rubber ring is installed in the groove of the nozzle to prevent water leakage.

(2) The interface of the flowmeter can be connected with a matching ABS plastic pipe or a PVC plastic pipe with a special dehydration bonding connection, or it can be connected with a metal flange after being connected by a plastic method.

(3) 流量計必須垂直安裝,應無明顯傾斜,其安裝高度,應便於對浮子的讀數,讀數時,視線與浮子應水平。(一般標準:需用的流量爲流量計流量的50%70%,儘量不要用到高數。)

(4) The upstream and downstream inlet and outlet of the instrument should ensure that there are straight pipe sections with 5 times the diameter of the instrument.

(5) The pressure of the fluid to be measured must be stable. If the fluid pressure is unstable, the float will fluctuate and cannot be measured correctly. A buffer or a valuer should be installed upstream of the flowmeter.

When using the flowmeter, it should beSlowly open the upstream valve to full open, then adjust the flow with the regulating valve downstream of the flow meter. (To prevent the float from suddenly impacting upwards, damaging the instrument, and avoiding sudden changes in the measured body temperature. If the flowmeter is found to have leakage during use, it is generally due to the dislocation or failure of the sealing ring, which should be corrected or replaced.) When the flowmeter is stopped, it should be slowly Close the upstream valve, then close the flow regulating valve downstream of the flow meter.

Area flow meter


Introduce

Area flow meterIt is a differential pressure flow meter. These are simple and versatile devices for measuring the flow of liquids, gases and steam. They work with a fairly constant pressure drop. In these types of flow meters, a direct visual indication of flow is given by the position of a float, piston or vane. The position of their floats, pistons or vanes changes as rising flow rates open up a larger flow area for the flowing fluid to pass through. When flow is reduced, gravity or springs are used to return the flow element to its static position. Gravity flow meters must also be installed in a vertical position, whereas spring-loaded flow meters can be installed in any position. Each variable area flow meter has a local indicator. In addition, they can be equipped with position sensors and transmitters, i.e. pneumatic, electronic, digital or fiber optic type sensors, for linking to remote displays or controls.

The area flowmeter is composed of a vertical tapered tube that expands from bottom to top and a float with a circular cross-section. The float is moved by the force of the fluid flowing from bottom to top, and the volume of flow is calculated through the area of the fluid. Flow meter, widely used in electric power, petrochemical, chemical, sewage treatment and other industries

Area flow metertype

Area flow meterAvailable in the following designs

  • Rotameter (with float in conical tube)
  • Orifice/rotameter combination, i.e. bypass rotameter
  • Open channel variable gate
  • Cone Quick Plug, and
  • Vane or Piston Design

Rotameter

Rotameteris the most widely used variableArea flow meter.RotameterBasically it consists of a vertically oriented glass or plastic conical tube and a metering float that can move freely inside the tube. Rotameters, although classified as differential pressure units, are actually constant differential pressure devices. Flange end fittings provide an easy way to install them in pipes. The float is free to rest on the bottom of the tube when there is no fluid flow. When the liquid enters the bottom of the tube, the metering float begins to rise. The position of the float varies directly with the flow. The precise position of the float is where the pressure difference between the upper and lower surfaces balances the weight of the float. The greater the flow, the higher the float is lifted. In the case of a fluid, the float rises due to a combination of the buoyancy of the liquid and the velocity head of the fluid, whereas with a gas the buoyancy is negligible and the float responds to a large extent to the velocity head. The figure below shows a typical rotameter:

 


main feature

  1. existRotameter, the height of the float indicates the flow.
  2. RotameterTubes can be calibrated and indexed with appropriate flow units.
  3. RotameterThe turndown ratio is usually as high as 12:1.
  4. Accuracy may be up to 1% of full scale rating.
  5. RotameterTubes can be made of glass, metal or plastic.
  6. Tube diameters range from 1/4 to greater than 6 in.
  7. In safe applications such as air or water,RotameterThe tubes can be made of glass, while they come with metal tubes in cases where a rupture could lead to an unsafe condition.
  8. Also, for higher pressures and temperatures above the practical range of glass, metal tubing is usedRotameter.
  9. plastic pipeRotameteris medium costRotameter. Also, they are ideal for applications involving corrosive fluids or deionized water.
  10. Almost all rotameters are insensitive to viscosity changes. The most sensitive are extremely small with spherical floatsRotameter, while larger rotameters are less sensitive to viscosity effects.
  11. Rotameters including magnetic floats can be used for alarm and signaling functions.
  12. Since the flow rate can be read directly on the scale installed next to the tube, no auxiliary flow reading device is required. However, an automatic sensing device can still be used to sense the float level and send a flow signal if desired.
  13. Each float position corresponds to a specific flow rate for a specific fluid density and viscosity. Therefore, sizing the rotameter for each application is critical. If properly sized, the flow rate can be determined by matching the float position to a calibrated scale on the outside of the rotameter.
  14. Many rotameters have built-in valves for manual flow adjustment.
  15. Various shapes of floats are available for various applications. One early float design had slots, which caused the float to rotate for stabilization and centering. Due to this rotation of the float, the term rotameter was coined.

Rotametersize of

Rotameters typically have calibration data and direct reading scales for air or water or both. In order to size a rotameter for other services, the actual flow must first be changed to a standard flow. In the case of liquids, the standard flow should be the water equivalent in gpm, while when it comes to gas, the expected standard flow is the air flow in standard cubic feet per minute (scfm).
Rotameter manufacturers provide tables listing standard water equivalent gpm and air scfm values. They should also provide available slide rules, nomograms, or computer software, which is often required for sizing rotameters.

advantage

The main advantages of the rotameter are as follows:

  • low cost
  • simple design
  • low pressure drop
  • widely used
  • Linear output

How to choose a variable area flowmeter?

Flowmeter
What are the minimum and maximum flows for ?
What are the minimum and maximum process temperatures?
What is the size of the tube?
Would you like to use a direct reading meter or would you accept an inquiry meter?
What precision do you need?
Do you need a valve to regulate flow?
Will there be back pressure?
What is the maximum process pressure?

Additional information

Application

Flow Meter

Types of

Mechanical

Installation method

mouth, plate

size

PFB220 rotameter diminsion
No needle valve  with needle valve

Application field

Variable Area Flowmeter


Introduce

A variable area flowmeter is a differential pressure flowmeter. These are simple and versatile devices for measuring the flow of liquids, gases and steam. They work with a fairly constant pressure drop. In these types of flow meters, a direct visual indication of flow is given by the position of a float, piston or vane. The position of their floats, pistons or vanes changes as rising flow rates open up a larger flow area for the flowing fluid to pass through. When flow is reduced, gravity or springs are used to return the flow element to its static position. Gravity flow meters must also be installed in a vertical position, whereas spring-loaded flow meters can be installed in any position. Each variable area flow meter has a local indicator. In addition, they can be equipped with position sensors and transmitters, i.e. pneumatic, electronic, digital or fiber optic type sensors, for linking to remote displays or controls.

Types of Variable Area Flow Meters

Variable area flow meters are available in a variety of designs:

  • Rotameter (with float in conical tube)
  • Orifice/rotameter combination, i.e. bypass rotameter
  • Open channel variable gate
  • Cone Quick Plug, and
  • Vane or Piston Design

Rotameter

Rotameters are the most widely used variable area flowmeters. A rotameter basically consists of a vertically oriented glass or plastic conical tube and a metering float that can move freely within the tube. Rotameters, although classified as differential pressure units, are actually constant differential pressure devices. Flange end fittings provide an easy way to install them in pipes. The float is free to rest on the bottom of the tube when there is no fluid flow. When the liquid enters the bottom of the tube, the metering float begins to rise. The position of the float varies directly with the flow. The precise position of the float is where the pressure difference between the upper and lower surfaces balances the weight of the float. The greater the flow, the higher the float is lifted. In the case of a fluid, the float rises due to a combination of the buoyancy of the liquid and the velocity head of the fluid, whereas with a gas the buoyancy is negligible and the float responds to a large extent to the velocity head. The figure below shows a typical rotameter:

Rotameter


main feature

  1. In a rotameter, the height of the float indicates flow.
  2. Rotameter tubes can be calibrated and indexed with the appropriate flow units.
  3. Rotameters typically have turndown ratios as high as 12:1.
  4. Accuracy may be up to 1% of full scale rating.
  5. Rotameter tubes can be made of glass, metal or plastic.
  6. Tube diameters range from 1/4 to greater than 6 in.
  7. In safe applications, such as air or water, rotameter tubes can be made of glass, while in situations where a rupture could lead to an unsafe condition, they come with metal tubes.
  8. Additionally, for higher pressures and temperatures above the practical range of glass, metal tube rotameters are used.
  9. Plastic tube rotameters are medium cost rotameters. Also, they are ideal for applications involving corrosive fluids or deionized water.
  10. Almost all rotameters are insensitive to viscosity changes. The most sensitive are extremely small rotameters with spherical floats, while larger rotameters are less sensitive to viscosity effects.
  11. Rotameters including magnetic floats can be used for alarm and signaling functions.
  12. Since the flow rate can be read directly on the scale installed next to the tube, no auxiliary flow reading device is required. However, an automatic sensing device can still be used to sense the float level and send a flow signal if desired.
  13. Each float position corresponds to a specific flow rate for a specific fluid density and viscosity. Therefore, sizing the rotameter for each application is critical. If properly sized, the flow rate can be determined by matching the float position to a calibrated scale on the outside of the rotameter.
  14. Many rotameters have built-in valves for manual flow adjustment.
  15. Various shapes of floats are available for various applications. One early float design had slots, which caused the float to rotate for stabilization and centering. Due to this rotation of the float, the term rotameter was coined.

Dimensions of the rotameter

Rotameters typically have calibration data and direct reading scales for air or water or both. In order to size a rotameter for other services, the actual flow must first be changed to a standard flow. In the case of liquids, the standard flow should be the water equivalent in gpm, while when it comes to gas, the expected standard flow is the air flow in standard cubic feet per minute (scfm).
Rotameter manufacturers provide tables listing standard water equivalent gpm and air scfm values. They should also provide available slide rules, nomograms, or computer software, which is often required for sizing rotameters.

advantage

The main advantages of the rotameter are as follows:

    • low cost
    • simple design
    • low pressure drop
    • widely used
    • Linear output

Order model

Order model
PFB220 coding fluid type
 

A normal water
B gas
 

coding Flow range
1 2~20 L/h Normal(for Water Type)
2 4~40 L/h Normal(for Water Type)
3 6~60 L/h Normal(for Water Type)
4 10~100 L/h Normal(for Water Type)
15 0.5~5 LPM(for Air Type)
16 1~10 LPM(for Air Type)
17 2~20 LPM(for Air Type)
18 4~40 LPM(for Air Type)
19 5~50 LPM(for Air Type)
20 10-~100 LPM(for Air Type)
34 1~10 SCFH(for Air Type)
35 2~20 SCFH(for Air Type)
36 4~40 SCFH(for Air Type)
37 8~80 SCFH(for Air Type)
38 10~100 SCFH(for Air Type)
39 20~200 SCFH(for Air Type)
 

coding float material
1 SS316L
 

coding needle valve
W with Needle Valve(For Water&Air)
N without Needle Valve(For Water Only)
 

coding Installation method
BB Back to Back
 

coding Printing customer logos
F FGT
 

N
Printing customer Logo
PFB220 Complete order model
*Note: The use of a single model with a customized trademark requires more than 100 sets/year
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