Micromeritics ACCUPYC II 1345 Operator's Manual page 148

12 Maintenance and Troubleshooting
Action D: Replace the O-ring in the chamber cap. See
facing
Cause E: Gas leaks in the cell chamber or expansion chamber.
Action E: Check the pycnometer for leaks.
bers for Leaks on page 12 - 5
Cause F: The helium tank is low on gas or empty. Tank pressure should be at least 200
psi above regulator pressure.
Action F: Check tank. Minimum recommended pressure is 200 psig above regulator pres-
sure. See
Cause G: The shutoff valve on the gas cylinder is closed.
Action G: Ensure that the valve is open.
Cause H: The Zero offset (of pressure transducer) is too low.
Action H: Check offset by opening chamber cap. If pressure is negative (displayed on
instrument schematic), run a new zero offset. See
ducer & Chamber Volume on page 10 -
Cause I: Dust filter on 2000 cm
Action I: Clean the dust filter. See
Helium drained from tank.
Cause A: Leaks in the gas line connection.
Action A: Pressurize the system. Close, then open the gas cylinder shutoff valve. If the
needle on the pressure gauge falls abruptly, a leak in the gas line connections
may be indicated. Check all gas line connections.
Cause B: Pycnometer was left in Manual mode with all the valves open or the fill valve
open and chamber cap off.
Action B: Close all valves, then attach a new tank of helium.
Unit will not equilibrate, or results are not reproducible.
Cause A: Sample outgassing.
Action A: Prior to analysis, remove moisture and contaminants from the sample. See
pare and Load a Sample on page 6 -
Cause B: Dust filter on 2000 cm
Action B: Clean the dust filter. See
12 - 2
page.
Regulator Pressure on page 12 -
3
unit is clogged or leaking to atmosphere.
Clean the Dust Filter on page 12 -
3
unit is clogged or leaking to atmosphere.
Clean the Dust Filter on page 12 -
Chamber Cap O-Ring on the
See Check the Cell and Expansion Cham-
.
12.
Zero the Pressure Trans-
20.
1.
AccuPyc II 1345 Operator Manual
134-42851-01 (Rev -) — Not Released
7.
Pre-
7.