Internal Calibrations Page 8-
Section 8 Internal Calibrations
The accuracy of diluted calibration gases produced by the Model
2010D is dependent upon the accuracy of its mass flow
controllers and ozone generator. These devices are calibrated
at the factory prior to shipment to the customer, but in order to
maintain the 2010D's calibration accuracy over time, it is
recommended that the mass flow controllers and ozone generator
be checked periodically against external calibration standards
and calibrated as necessary.
Fortunately, calibrating any of the Model 2010D's flow
controllers or the ozone generator is a simple process that may
be performed by the end-user. This is usually accomplished by
following an interactive software procedure that prompts the
user to perform a multi-point calibration, stepping the device
through multiple setpoints across its range. For each point,
the user is prompted to enter the measured results from the
external calibration reference, resulting in a table comparing
monitor tothe 2010D's control and voltages the external
reference. Alternatively, the user may manually enter a
calibration table, or simply enter polynomial coefficients, in
order to calibrate a device.
Whichever technique is used, it is essential that all devices be
calibrated in order to establish the correspondence between the
2010D's control and monitor voltages and the actual flow rate or
ozone concentration.
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