INFICON Composer Gas Concentration Controller - Manual (Page 72)

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Composer Operating Manual
3.1.12 What Happens if the Reference Zero
is Improperly Set
If the Reference Zero is set when the conditions are wrong, i.e. not pure gas,
two bad results occur.
1 A permanent concentration offset equal to the concentration at the time of
zero is introduced. This is not corrected until a proper Zero Set is performed.
2 The sensitivity is altered, leading to an error proportional to the
concentration.
Figure 3-6 Impact of Wrong Zero Frequency
Factory zero will be restored:
Š if one of the gas parameters (molecular weight or γ ) is altered.
Š if the instrument is powered on with the "Always Use Factory Zero"
configuration switch active, SW#6 of CFGR2.
Š if selected, through the Set Up Tool or Monitor Software menu.