Teledyne GFC-7001T - Trace CO Analyzer - Manual (Page 216)

Calibration Procedures Teledyne API – Model T300/T300M CO Analyzer
Teledyne Analytical Instruments 216
9.6.2. PRESSURE CALIBRATION
A sensor at the sample chamber outlet continuously measures the pressure of the sample
gas. These data are used to compensate the final CO concentration calculation for
changes in atmospheric pressure and is stored in the CPU’s memory as the test function
PRES (also viewable via the front panel). See also Section 5.9.6.
I MPORTANT I MPACT ON R EADINGS OR D ATA
This calibration must be performed when the pressure of the sample gas
is equal to ambient atmospheric pressure. Before performing the
following pressure calibration procedure disconnect the sample gas-line
vent from the rear panel sample gas inlet.
To cause the analyzer to measure and record a value for PRES, press.