PPCH™ OPERATION AND MAINTENANCE MANUAL
© 2009 DH Instruments, a Fluke Company
Page 166
Remove the valve from the bracket by removing the
two mounting bolts.
To replace the valve, valve simply reverse the order of
operations. Use valve p/n 402171.
Close PPCH chassis (see Section 5.9).
Leak test the PPCH to verify that valve replacement
corrected the leak (see Section 5.11.1).
Step 7
5.12.2
CONTROL VALVE SERVICE
The servo controlled valves that are used to set ascending and descending pressure ramps
to control pressure in a PPCH (see Sections 5.14.2.11, 5.11.2), are not serviceable by the
user. If you have concluded that there is a malfunction with a control valve of your PPCH,
contact a DHI Authorized Service Provider (see Table 31).
5.13
RELOADING EMBEDDED SOFTWARE INTO FLASH
MEMORY
PPCH uses FLASH memory. This allows the embedded software that controls PPCH operations and
functions to be loaded into PPCH 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 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 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 embedded software are available for
download from DHI web site, www.dhinstruments.com.
