Aalborg DFM Digital - Manual (Page 28)

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5.3.9 K Factors Settings
Conversion factors relative to Nitrogen for up to 32 gases are stored in the DFM
(see APPENDIX II). In addition, provision is made for a user defined conversion
factor. Conversion factors may be applied to any of the ten gas calibrations via key-
pad or digital interface commands.
The available K Factor settings are:
= Disabled
(K = 1)
= Internal Index The index [0-31] from internal K factor table (see APPENDIX II).
= User Defined User defined conversion factor
Note: The conversion factors will not be applied for % F.S.
engineering unit.
From the Main Menu, the user would traverse the menu tree until reaching the "K
Factors" menu. The following screen will appear:
Figure b-17, K Factors Screen
The user selects a K factor by scrolling up/down the list of available options until
the desired option is highlighted and then presses (
u) [Enter] button. For Internal
Index and User Defined options user will be prompted to enter desired index/value
of conversion factor.
5.3.10 Zero Calibration
The DFM includes an auto zero function that when activated, automatically adjusts
the mass flow sensor to read zero. The initial zero adjustment for your DFM was
performed at the factory. It is not required to perform zero calibration unless the
device has zero reading offset with no flow conditions.
,