Calibration Quality; Calibration Of The Electronic Subsystems; Pressure Calibration; Flow Calibration - Teledyne T400 User Manual

4.4

CALIBRATION QUALITY

After completing any of the calibration procedures described above, it is important to
evaluate the analyzer's calibration SLOPE and OFFSET parameters. These values
describe the linear response curve of the analyzer. The values for these terms, both
individually and relative to each other, indicate the quality of the calibration.
To perform this quality evaluation, check these parameters in the Dashboard
(Setup>Dashboard to configure if needed) and frequently compare them to those values
on the Final Test and Validation Data Sheet that was shipped with your instrument,
which should not be significantly different. If they are, refer to the Troubleshooting
content in Section 5.
4.5

CALIBRATION OF THE ELECTRONIC SUBSYSTEMS

There are several electronic characteristics of the T400 analyzer's photometer that may
occasionally need checking or calibration These calibrations include Dark Calibration,
Pressure Cal and Flow Cal (and O3 Gen Cal when the O
all located under the Utilities>Diagnostics menu.
4.5.1 P
RESSURE
A sensor at the exit of the sample chamber continuously measures the pressure of the
sample gas. The data for Sample Pressure are used to compensate the final gas
concentration calculation for changes in atmospheric pressure and are stored in the CPU's
memory.
IMPORTANT
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 pump and sample gas-line vent
from the rear panel sample gas inlet.
Activate this procedure in the Utilities>Diagnostics>Pressure Cal menu.
4.5.2 F C
LOW ALIBRATION
The flow calibration allows the user to adjust the values of the sample flow rates as they
appear in the Dashboard 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.
To carry out this adjustment, connect an external, sufficiently accurate flow meter to the
sample inlet per Section 5.6.6. Once the flow meter is attached and is measuring actual
gas flow, use the Utilities>Diagnostics>Flow Cal menu to input the flow meter reading
and calibrate.
083730400A DCN8130
C
ALIBRATION
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Generator option is installed),
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Analyzer
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