PFM500 flange type: area flowmeter (floating value flowmeter)

PFM500 flange type: area flowmeter (floating value flowmeter)

  • Measure the flow rate of the following substances: (non-organic solvent/general water/tap water)
  • Conditions of use: Viscosity≦3 cP
  • Maximum working temperature: 100℃
  • Maximum working pressure: UPVC pipe: 6kg/cm2
  • Alarm switch optional: one group/two groups of alarms
  • Accuracy: FS±5%

Description

  • Measure the flow rate of the following substances: (non-organic solvent/general water/tap water)
  • Conditions of use: Viscosity≦3 cP
  • Maximum working temperature: 100℃
  • Maximum working pressure: UPVC pipe: 6kg/cm2
  • Alarm switch optional: one or two sets
  • Accuracy: FS±5%

Area flow meter


Introduce

An 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

Additional information

Application

Flow Meter

Types of

Mechanical

Installation method

Flange

Output method

Switch signal

Application

Factory

size

PFM500 Variable Area Type FlowMeter longshort dimension PFM500 Variable Area Type FlowMeter flange dimension
Long/Short Type Flange Type
Bore Long Type Short Type Flange Type Using Piping Size
DN(mm) L D1 D2 L D1 D2 L D1 D2 mm
DN15 280 20 45 202 20 45 15 or 20
DN25 380 32 68 226 32 60 25 or 32
DN32 228 40 74 32 or 40
DN50 430 43 98 341 63 98 50 or 63
DN65 430 75 22 65 ro 75
DN100 550 17 175 100
DN125 550 17 205 125
DN150 560 21 240 150

Scope of application

Area flow meter


Introduce

An 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

Flow range

Size DN(mm) Code Flow Rang: Liquid L/hr @20°C Max.Pressure Max.Tep. Accurancy
Long-Type Short-Type (Mpa) (°C) FS %
15 01501 10~100 5~50 ≦0.6 0~60℃ 4.0
01502 16~160 10~100
01503 25~250 16~160
01504 40~400 25~250
01505 60~600 40~400
01511 50~500
01512 60~600
01513 100~1000
25 02501 100~1000 100~1000
02502 160~1600 160~1600
02503 250~2500 250~2500
Size DN(mm) Code Flow Rang: Liquid m3/hr @20°C Max.Pressure Max.Tep. Accurancy
Long-Type Short-Type (Mpa) (°C) FS %
32 03001 —- 0.4~4 ≦0.6 0~60℃ 4.0
03002 —- 0.6~6
50 05001 0.4~4 —-
05002 0.6~6 —-
05003 1~10 1~10
05004 1.6~16 1.6~16
65 06501 —- 2.5~16
06502 —- 5~25
06503 —- 8~40
06504 —- 12~60
Size DN(mm) Code Flow Rang: Liquid m3/hr @20°C
Flange Type
100 10001 14~90 14~90
10002 18~120 18~120
125 12501 14~90 14~90
12502 18~120 16~120
12503 18~150 20~150
12504 20~180 —-
150 15001 14~90 14~90
15002 18~120 16~120
15003 18~150 20~150
15004 20~180 25~180
15005 25~250 —-
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