5. MAINTENANCE, ADJUSTMENTS AND CALIBRATION
Page 135
© 2007 DH Instruments, a Fluke Company
•
Check that internal screws, bolts and nuts are tight.
•
Verify that internal barometer reads atmospheric pressure, ± 0.1 kPa (0.015 psi). Adjust if necessary
(see Section 5.3).
•
Verify that utility sensor, if present, indicates the correct pressure within ± 0.1 % FS over its range.
Adjust if necessary (see Section 5.4).
•
Verify that high pressure supply pressure transducer indicates correctly (see Section 3.5.7.3).
•
Replace filter elements (one low pressure pneumatic, two high pressure pneumatic).
•
Pressurize PPCH-G to 90 % of maximum pressure and leak test. Use
[LEAK CK]
function (see Section
3.3.9). Leak rate, after stabilization, should not exceed 0.002% of reading/ second.
•
Check the PPCH-G controls within specifications over its range (see Section 1.2.3).
•
Perform calibration of Q-RPTs (see Section 5.2).
5.8
RELOADING EMBEDDED SOFTWARE INTO FLASH
MEMORY
PPCH-G uses FLASH memory. This allows the embedded software that controls PPCH-G operations
and functions to be loaded into PPCH-G over its COM1 port from a computer with a simple FLASH
loading utility program.
To replace corrupted software or upgrade your software, access the
DHI
worldwide web site at
www.dhinstruments.com
and go to
SOFTWARE
. A FLASH loading utility and the latest release of
PPCH-G software are available for download at no charge. If you do not have access to the web or have
difficulty downloading or loading software, contact your
DHI
representative or a
DHI
Authorized Service
Provider for assistance.
If you believe you have discovered an error or “bug” in PPCH-G software, please report it with complete
details by email to
or submit an on-line
Quality Feedback
Report
at
www.dhinstruments.com
.
The DHI flash software loading utility (WinFlash) and PPCH-G embedded software are available for
download from DHI web site, www.dhinstruments.com.
