DH Instruments ADCS-601, Руководство по эксплуатации и обслуживанию

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7. MAINTENANCE OF TRACEABILITY AND RECALIBRATION
Page 147 © 2005 DH Instruments, Inc.
Figure 62. PG7601 Ambient Sensors Adjust Form
7.3 RECALIBRATION
7.3.1 OVERVIEW
To assure that the ADCS-601 operates within pressure measurement uncertainty limits,
certain metrology maintenance functions are required. See Section 7.2 for instructions on
these procedures.
In addition to the metrology maintenance functions, to assure that the pressure values set and
measured by the ADCS-601 remain within predicted measurement uncertainty levels over time,
regular recalibration of certain components is required. The recalibrations required are
summarized in Table 23, including cross-reference to manual sections detailing each procedure.
Table 23 . Recalibration requirements
SYSTEM PROCEDURE DESCRIPTION FREQUENCY SEE
SECTION
PG7601 Calibration of
piston-cylinder
module
Determination of piston-cylinder
effective area and entry of new
effective area value into system. Yearly until decreased frequency justified
by experience.
Recommended end of first and second
years, then every three years if no
significant changes observed.
7.3.2
PG7601 Calibration of
mass set
Determination of mass values of
mass set and piston assembly and
entry of new values into the system. Yearly until decreased frequency justified
by experience.
Recommended end of first and second
years, then every three years if no
significant changes observed.
7.3.3
PG7601 Calibration of
piston-cylinder
temperature
sensor.
Determination of offset of reading of
platinum resistance thermometer
mounted in PG7601 mounting post
relative to a temperature standard and
entry of new offset into the system. Yearly until decreased frequency justified
by experience.
Recommended end of first and second
years, then every three years if no
significant changes observed.
7.3.4
PG7601 Calibration of
reference
vacuum CDG
Determination and adjustment of
slope of the reference vacuum
capacitance diaphragm gauge, power
supply and read out. 6 months, increase to 1 year when
justified by experience. 7.3.5