2. INSTALLATION
Page 29
© 1998-2008 DH Instruments, a Fluke Company
2.4.2
CHECK THAT ON-BOARD PISTON-CYLINDER MODULE
AND MASS SET INFORMATION ARE CORRECT
PG7000 uses stored piston-cylinder and mass set metrological information to calculate the
reference pressures it defines (see Section 3.1). For the pressure values to be correct, the
stored metrological information on the piston-cylinder, mass set and mass loading bell must
be correct. Before using PG7000 for accurate pressure definition, the validity of the stored
information should be verified. This consists of comparing the piston-cylinder, mass set and
mass loading bell information stored in PG7000 to the information in the current piston-cylinder
and mass set calibration reports.
To verify the PG7000 piston-cylinder, mass set and mass loading bell information, use the
piston-cylinder and mass set viewing capabilities accessed by pressing
[SPECIAL]
,
<1PC/MS>
(see Section 3.11.1). Compare all the information contained in the PG7000
piston-cylinder, mass set and mass loading bell files to the information on the current
piston-cylinder, mass set and mass loading bell calibration reports.
2.4.3
SET LOCAL GRAVITY VALUE
PG7000 uses the value of local acceleration due to gravity (gl) in its calculation of the
reference pressure it defines (see Section 3.1). The correct value of local acceleration due to
gravity at the site of PG7000 use must be entered. This is accomplished by pressing
[SPECIAL]
,
<6gl>
(see Section 3.11.6) and editing the value of local gravity.
2.4.4
SETUP PRESSURE EQUATION VARIABLE INPUT SOURCES
PG7000 uses many variables in calculating defined pressures. The sources of the variables
are determined by the current SETUP file. SETUP files are viewed, created, edited and
selected using the SETUP function accessed by pressing
[SETUP]
(see Section 3.10).
A factory SETUP file is available and already selected on a new PG7000, but the operator
may desire to customize it. The factory setup file assumes that PG7000’s internal
measurement values will be used whenever possible.
2.4.5
CHECK PROPER OPERATION OF AMBIENT CONDITION
MEASUREMENTS
PG7000 automatically measures ambient conditions and uses these conditions in its
pressure calculations.
To verify that the ambient condition measurements are operating properly proceed as follows:
•
Display current ambient condition readings:
Press
[AMBIENT]
. The ambient
conditions run screen is displayed (see Section 3.9.6).
•
Verify proper ambient condition readings:
Compare the ambient condition values
displayed to the actual values of ambient conditions. Refer to the ambient condition
measurement specifications when evaluating the ambient readings (see Section 1.2.1.2).
The unit of measure in which ambient pressure is displayed is the same as the unit selected
by pressing [UNIT] (see Section 3.9.3). Units of measure in which other ambient condition values
are expressed cannot be changed.
PG7000 allows the source of ambient condition values used in reference pressure
calculations to be specified. The source may be PG7000’s on-board measurements, default values
or operator entered values. See Section 3.10 for information on specifying the source of ambient
condition values used by PG7000 in reference pressure calculations.
