Ametek 241CE II

6. When the ushing is complete, reset the MTLo to a temperature below
the propane’s dewpoint temperature. This allows the analyzer to proceed
through a proper measuring cycle. Once the purging time (Purge) has
elapsed and the solenoid valve has closed – prior to the beginning of the
Cooling Stage – check the pressure gauge to verify the correct pressure of
the propane. It should have increased slightly after the solenoid valve has
closed.
The reported HCDP temperature should agree within ±1 °C (±2 °F) of the
temperature at which the vapor pressure of propane is equal to the pres-
sure of propane in the Measuring Cell.
For a propane dewpoint temperature of -10 °C, ±1 °C (+14 °F, ±2 °F),
the absolute pressure of propane in the Measuring Cell must be within
345.1 KPA, ±4 KPA, absolute (50.05, ±0.6 PSIA). For reference, the vapor
pressures of propane from -56.6–44.3 °C (-69.9–111.7 °F) are tabulated
in Figures 6-1 and 6-2.
7. Remove the propane tank (with regulator and shut-o valve), reinstall
the 1/3 PSIG check valve on the Filterblock Assembly, and reconnect the
Sample Line to the Filterblock.
8. Perform a leak test on the connection to ensure there are no leaks. See
“Sample System Leak Check” in Chapter 2 for information on how to per-
form this test.
After the sample system leak check has been completed and has passed,
return to and complete these procedures.
9. Slowly open the isolation valve at the sample stream.
RUN Mode
ApplicCFGPurge
PN 903-8797, Rev A
Functional Verication | 6-3