Plasma Gas Analyzer
60 02001001A_9
Figure 44 - CALIBRATION FACTOR CALCULATION MENU
To re-span the instrument, a re-zero must have been performed before. You must then allow
the span gas to flow in the analyzer. If your analyzer has the auto-calibration option, select
“SPAN” as the gas source from the CALIBRATION MODE SELECTION MENU by using the
“F1” key.
When this is done, let the gas stabilize, go back to the CALIBRATION FACTOR
CALCULATION MENU and press “F2” to re-span the instrument. Selecting “F2” will confirm
the re-span of the instrument and will start the factor calculation with the gas currently flowing.
“CALIBRATION DONE” must be displayed next to “CALIBRATION STATUS”. From that
point, you may press “F4” several times to exit the calibration menus.
NOTE: “WARNING: actual selected gas is” followed by the gas currently selected is
displayed if this gas is not the zero gas (SOV2 energized) when a re-zero is about to be
performed or if it is not the span gas (SOV3 energized) when a re-span is about to be
performed.
The previous procedure was intended for a manual calibration in which the user controls the
various steps of calibration. To enable the analyzer to recalibrate by itself, read the following
section about automatic calibration.
In this mode, the analyzer executes calibration (i.e. re-zero and re-span) at fixed intervals
defined by the user. This duration is called “TIME BETWEEN CALIBRATIONS”. When this
time interval is reached, the analyzer opens the status contact and energizes solenoid SOV2 to
allow the zero gas to flow into the instrument. This gas flows during “TIME ON CAL.GAS”
which is also defined by the user. When the “TIME ON CAL. GAS” is reached, a re-zero (with
the zero gas) is automatically performed. The span gas is then selected for a “TIME ON CAL.
GAS” duration after which a re-span is automatically executed (with the span gas). Finally, the
analyzer automatically re-selects the sample gas and closes back the status contact.
Calibration timers are re-settled at zero and the cycle is repeated again and again.
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