Fluke A20M-AF ユーザーズマニュアル

© 2007 DH Instruments, a Fluke Company 

Page 124 

There are no HPMS maintenance procedures other than the overhaul procedure. 

RPM4/HPMS A70M/A20M-AF is generally overhauled as one common assembly. 

 

Removal of RPM4 from the HPMS is not recommended unless required to perform 
RPM4 and/or HPMS repairs.  See Section 5.4.1 if it is necessary to remove the RPM4 from 
the HPMS. 

Any or all of the following items may be included as part of an RPM4/HPMS A70M/A20M-
AF overhaul: 

•  Check that RPM4 rear panel mounted cooling fan operates when RPM4 is powered. 
•  Clean and inspect HPMS rear panel TEST port connection. 
•  Check that internal fittings, screws, bolts and nuts are tight. 
• Perform 

system 

leak 

and operational check. 

•  Check Lo Q-RPT pressure relief valve for proper operation.  It should crack at about 

3 300 psi.  Do not apply pressure greater than 3 600 psi to the RPM4 Lo Q-RPT as it 
may be damaged beyond repair.  The RPM4 warranty does not cover damage due 
to Q-RPT overpressure. 

•  Clean RPM4 and HPMS front panel. 
•  Verify that RPM4 internal barometer reads atmospheric pressure within ± 0.15 psi 

(1 kPa).  Adjust if necessary (See Section 5.2.2). 

•  Perform calibration of quartz reference pressure transducers (Q-RPTs), if necessary (see 

Section 5.3)