FPG8601™/VLPC™ OPERATION AND MAINTENANCE MANUAL
© 2007 DH Instruments, a Fluke Company
Page 104
6.9.2.2
[ABSOLUTE MODE]
Refer to Section 4.6 for information on how to set up the FPG for absolute
mode operation. FPG Tools handles all of the necessary valving changes to set
absolute mode. The specific sequence is defined below.
All required valving and vacuum pumps must be connected prior to
attempting to use the absolute mode option.
Activate the system vacuum pumps and make sure the mounting post is
isolated from ATM.
Any VLPC pressure is vented and the bypass valve is opened.
The VLPC is set to the lowest available absolute pressure range.
The internal transducer is connected to the mounting post to read the
reference pressure. The absolute mode process will not continue unless the
reference pressure in the mounting post is below 20 kPa.
The absolute pressure regulator is then opened. This should reduce the
pressure in the lubrication volume to roughly 40 kPa. The internal transducer
is pneumatically connected to the lubrication volume to read this pressure.
FPG Tools does not look for any level of system stability when changing
measurement modes. The system is now in absolute mode.
When transitioning from gauge to absolute mode, a minimum 30 minute
warm up time should be observed to allow the conditions around the load cell
to stabilize.
Purge the lubrication volume to reach the proper humidity value. It is
possible to always purge after measurement mode changes by using the
[Config], [System Setup], <Auto purge lubrication volume..>
option (see
Section 6.6.2.1).
Zero the FPG, then run an internal calibration.
6.10
[CHANGE USER LEVEL]
FPG Tools is designed for two basic user levels: Standard and Diagnostic. The standard user level does
not allow the features in
[Internal Limits]
and
[FPG Calibration Setup]
to be modified, nor is there
access to the
<Valve Control Toolbar>
. This is the intended use of the program. Users will not have the
ability to change critical calibration data. The Diagnostics user level provides unrestricted access to all
features in FPG Tools. Users can change calibration information as well as manually actuate internal
valves. Make sure FPG Tools is operated at a user level appropriate for the user.
To change user levels, abort the current run mode in FPG Tools, then use the
[Config], [Change User
Level]
menu option. The user level cannot be changed while the FPG is polled. A dialog appears to
allow an 8 digit password to be entered. If you do not wish to use a password, just press
[Enter]
. After a
password is entered, it must be used to change user levels. When the appropriate password is entered,
FPG Tools completely shuts down and restarts to change to the new user level.
If you do not wish to use a password, just press [Enter]. After a password is entered, it must be used
to change user levels. If you forget your password, contact DH Instruments technical service
for assistance.
