Checking The Cell And Expansion Chambers For Leaks - Micromeritics AccuPyc II 1340 Operator's Manual

AccuPyc II 1340

Checking the Cell and Expansion Chambers for Leaks

Perform the following procedure to check the cell and expansion chambers for leaks. The
valve states are shown at the end of each pertinent step (steps in which valve actions have been
taken). The first character represents the Fill valve, the second character represents the
Expansion valve, and the third character represents the Vent valve .
Before performing this procedure, check the chamber cap to ensure that it is not the
source of leaks. It should be free from particles, the O-ring should be properly seated,
and it should not contain excessive grease.
1. Allow the pycnometer to equilibrate thermally in a room having a stable temperature.
2. Press
Alt + 1
3. If the system has been open, manually purge the system before proceeding as follows:
a. Press
b. Press
c. Press
d. Repeat this procedure two or three times.
e. Press
4. Press
7
5. Fill the sample chamber to 19.5 psig.
6. Press 7
7. Observe the pressure display. After an equilibration period (about 20 to 30 seconds), the
pressure should not vary more than 0.005 psig/min.
• If the pressure does not vary more than 0.005 psig/min, proceed to step 8.
• If the pressure varies more than 0.005 psig/min., temperature instability or a leak may
be indicated. Vent the system, then repeat steps 4 through 7 several times to verify that a
leak is indicated. If a leak is indicated, call a Micromeritics Service Representative.
8. Press
9
valve; O - O - X.
9. Fill the chambers to 19.5 psig.
Aug 2013
to enter manual mode.
8 to open the Expansion valve and
to open the Fill valve; fill the sample chamber to the desired pressure.
7
7 to close the Fill valve and
8 to close the Expansion valve; X - X - O.
to open the Fill valve; O - X - O.
to close the Fill valve; X - X - O.
to close the Vent valve,
8 to
9 to close the Vent valve; X - O - X.
9 to open the Vent valve; X - O - O.
open the Expansion valve, and
Maintenance
to open the Fill
7
5-7