Teledyne GFC7001T User Manual Page 134

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SetupTeledyne API – Model T300/T300M CO Analyzer
Teledyne Analytical Instruments 134
5.9.5. DARK CALIBRATION
The dark calibration test interrupts the signal path between the IR photo-detector and the
remainder of the sync/demod board circuitry. This allows the instrument to compensate
for any voltage levels inherent in the sync/demod circuitry that might affect the
calculation of CO concentration. For details see Section 9.6.1.
5.9.6. PRESSURE CALIBRATION
A sensor at the exit of the sample chamber continuously measures the pressure of the
sample gas. The data are used to compensate the final CO concentration calculation for
changes in atmospheric pressure and are stored in the CPU’s memory as the test function
PRES (also viewable via the front panel). For details see Section 9.6.2.
5.9.7. FLOW CALIBRATION
The flow calibration allows the user to adjust the values of the sample flow rates as they
are displayed on the front panel and reported through COMM ports to match the actual
flow rate measured at the sample inlet. This does not change the hardware measurement
of the flow sensors, only the software-calculated values. For details see Section 9.6.3.
5.9.8. TEST CHAN OUTPUT
When activated, output channel A4 can be used in the standard configuration to report
one of the test functions viewable from the SAMPLE mode display. (See also Section
12.5.8.2).
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