Device Description; Free Air Delivery Measurement - Fad (Optional) - Siemens Sitrans FX300 Operating Instructions Manual

Vortex flowmeters

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SITRANS FX300

2.2.3 Device description

Figure 2-4: Device description

1 Signal converter

2 Cable feedthrough grey, standard version

3 Pressure sensor, optional

4 Shut-off valve, optional

5 Measuring sensor

6 Centering ring

A (air) compressor draws air from the ambient atmosphere, compresses it and delivers it at the

required pressure. Since the ambient atmosphere also contains water vapour, what the

compressor draws in is a mixture of air and water vapour. Free air delivery measurement is to

be understood under this condition. Most manufacturers specify free air delivery only at

standard intake conditions. What the user ultimately requires as process air must first be

determined before measuring can take place with an accuracy of ±1%.

The vortex flowmeter with the optional FAD function can measure the free air delivery online,

humidity and speed compensated, regardless of its function as standard flowmeter. The

integrated software evaluates the free air delivery automatically online.

The menu-driven, user-friendly software prompts the operator to enter the pressure, relative

humidity, the required as well as current discharge pressure.

The steam tables and compressibility tables are saved as standard. The measuring device is

optionally available with a pressure sensor which measures the discharge pressure online,

making manual input of the values unnecessary.

06/2009 - SFIDK.PS.050.F2.02 A5E02100423

www.siemens.com/flow

DEVICE DESCRIPTION

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