PN 903-8797, Rev A
“Part No.” refers to AMETEK Part Number.
To clean the Measuring Cell and replace its o-ring (Figure 4-1):
1. Bleed down the sample system. To do this, close the isolation valve on
the Sample Probe or at the Sample Inlet valve. Open the Bypass Valve and
allow the gas pressure in the sample system and Measuring Cell to depres-
surize for approximately 5 minutes.
Never bleed down the sample system pressure from the sample inlet
side of the Filterblock Assembly. Pressure dierentials of more than
210 KPA (30 PSI) in this direction can tear the Membrane Filters.
To decrease the bleed-down time, stop the normal measuring cycle by
changing the MTLo setting to 0.5 degree below the MTHi setting. (Record
the original value for future reference when returning it to its original
setting.) When exiting this menu, do not save the conguration to the
onboard EEPROM – this is a temporary condition only.
Change the purging time (Purge) to 20 minutes or greater. (Record the
original value for future reference when returning it to its original setting.)
When exiting this menu, do not save the conguration to the onboard
EEPROM – this is a temporary condition only.
2. After the sample system has depressurized, disconnect main AC power
to the analyzer by opening the power-disconnect switch (external to the
analyzer).
3. Using two wrenches – to avoid disturbing the connection ttings – discon-
nect the tubing ttings on the bottom of the Measuring Cell.
4. Disassemble the Measuring Cell for cleaning.
• If it is convenient and practical to do so, the Measuring Cell may be cleaned
without removing the entire Heatsink/Measuring Cell Assembly from the
Electronics Enclosure. If this can be done, continue with Step 5.
Do not separate the Heatsink from the Cooler Housing unless it is nec-
essary to inspect the Peltier Cooler or RTD in the Cooler Housing, and
only if instructed to do so by your AMETEK representative.
RUN Mode
ApplicCFGMTLo
RUN Mode
ApplicCFGPurge
Maintenance and Troubleshooting | 4-17
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