Fluke PG9000 Series, Operation And Maintenance Manual

Page: 185 / 202

5. MAINTENANCE, ADJUSTMENTS AND CALIBRATION
Page 175 © 2011 Fluke Calibration
Figure 27. Gas Operated, Gas Lubricated Piston-Cylinder Module Lubrication Chart.
5.3.5 Recalibration

PRINCIPLE
Piston-cylinders and mass sets are recalibrated by redetermining the effective area of the
piston-cylinder and the true mass values of the masses. It is recommended that
piston-cylinders and mass sets be recalibrated or verified at the end of their first and second
years of operation. Then, based on their observed stability, a longer calibration interval can
usually be assigned. Though other organizations may be able to perform these calibrations,
it is recommended that a Fluke Calibration Service be used, if possible.
The recalibration process may find values for piston-cylinder effective area, pressure
deformation coefficient and mass values that are different from the previous values. The
PG9000 piston-cylinder and/or mass set files must be edited to reflect the new values.
5.3.5.1 Updating Piston-Cylinder Module Files
See Section 3.12.1.2 for information on editing a piston-cylinder module file to
reflect new calibration data.
5.3.5.2 Updating Mass Set Files
See Sections 3.12.1.7 and 3.12.1.12 for information on editing mass set and
mass loading bell files to reflect new calibration data. The mass of the piston
assembly is included in the piston-cylinder module file (see Section 3.12.1.2).