Instrument Operation 5-39
C a u t i o n
Approximately 16,000 files can be created in a single directory of the
internal flash memory. Once this limit is reached, successive samples
will not be saved.
Performing Calibrations
The Calibration screen allows either the manufacturer or the user to
perform an instrument calibration, check the calibration, or return the
calibration to factory defaults. Performing a User Calibration allows you to
check or calibrate sheath and impactor flow rates. You may also zero the
differential pressure. Figure 5-23 below shows the Classifier mode
Calibration screen.
Figure 5-23
Electrostatic Classifier Calibration Screen
Performing a User Calibration
Perform sheath and impactor flow calibrations and check the accuracy of
existing calibrations with the User Calibration screen.
Sheath Flow
The sheath flow rate is measured and controlled internally by a thermal
mass flowmeter. It is calibrated to ±2% at the factory, as shown on the
classifier’s Certificate of Calibration. Sheath flow recalibration may be
necessary if the flowmeter has been replaced or if a sheath gas other than
air is being used. To perform a sheath flow calibration, follow these
instructions:
1. For best results (more stable flow), install a DMA to add back pressure
to the system.
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