Micromeritics AccuPyc 1330, Operator'S Manual

Page: 64 / 115

What Happened Why What To Do
Specified pressure not
reached or maintained.
(continued) Helium tank empty. Check tank. Minimum
recommended pressure
is 200 psig.
Cylinder Shut Off
Valve closed. Check that valve is
open.
Pressure regulator
defect or pressure set
too low. Check regulator to be
sure it is set properly.
Call a Micromeritics
Service Representative,
if necessary.
Zero offset (of pressure
transducer) too low. Check offset by
opening chamber cap.
If offset is negative,
run new zero offset
(Zeroing the Pressure
Transducer, Chapter 4).
Helium drained from
tank. Leaks in the gas line
connection. Pressurize the system.
Close, then open the
Cylinder Shut-Off
Valve. If the needle on
the pressure gauge on
the gas cylinder jumps
abruptly, a leak in the
gas line connections
may be indicated.
Check all gas line
connections. (Refer to
Rear Panel
Connections in
Chapter 2 for
connection instructions.)
Pycnometer was left in
manual mode with all
the valves open or the
fill valve open and the
chamber cap off. Close all valves, then
attach a new tank of
helium.
AccuPyc 1330 Troubleshooting
September 1996 5-3