Functional Verication | 5-3
6. When the flushing 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 vapour pressure of propane is equal to
the pressure 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 vapour pressures of propane from -56.6–44.3 °C
(-69.9–111.7 °F) are tabulated in Figures 5-1 and 5-2.
7. Remove the propane tank (with regulator and shut-off valve), reinstall
the 1 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 3 for information on how to
perform 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.
NOTE
RUN Mode
ApplicCFGPurge
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