3 how to calibrate – INFICON Composer Gas Concentration Controller User Manual
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Composer Operating Manual
4.2.3 How to Calibrate
Flow the calibration gas (usually pure carrier gas) through the Transducer at the
normal operating pressure and flow rate. Allow sufficient time for the calibration
gas to cleanse any mixed gasses out of the Resonant Chamber. The carrier gas
has displaced all of the formerly contained gas mixes when the concentration
stops changing. This condition is verified by the front panel STEADY indicator
(Ú) being illuminated. The new value for the Reference Zero is then established
by pressing the Set User Zero switch in the optional Composer Monitor
software package, pressing the Ref Zero key on the optional LCD Display, or
momentarily pressing a switch (customer supplied) connected to the SET ZERO
input located on the SYSTEM I/O connector’s pin #18. Refer to
and
. Note also that the transducers
temperature must also be at set point to complete calibration. The user zero is
retained until a new user zero is set or the gas parameters are changed. It is
not possible to calibrate when a non-zero value for the minimum flow parameter
has been set. If SW#6 of CFGR1 is set, only factory zero is used, see