OPG1™ Operation and Maintenance Manual
Page 33
©2000
DH Instruments, Inc
.
5.
T
ROUBLESHOOTING
PG1 is a sophisticated pressuring generating and adjusting instrument with advanced features
and functions. Before assuming that unexpected behavior is caused by a system defect or
breakdown, the operator should use this manual and other training facilities to become thoroughly
familiar with OPG1 operation. This troubleshooting guide is intended as an aid in identifying the
cause of unexpected OPG1 behavior and determining whether the behavior is due to normal
operation or an internal or external problem.
Identify the symptom or unexpected behavior you are observing from the
Symptoms
listed in
Table
3. A
Probable Cause
is provided and a
Solution
is proposed including references to manual
sections that provide information that may be of assistance.
Table 3.
OPG1 Troubleshooting Checklist
SYMPTOM
PROBABLE CAUSE
SOLUTION
Test pressure continuously
increases even with all valves
closed.
Leak in
INLET valve
or leak in
PDVV (+) valve(s)
.
Isolate leak to
INLET valve
or
PDVV
(+) valve(s)
by checking whether
pressure continues to increase when
PDVV (-) valves
are opened or PDVV
is at end of stoke. Replace or repair
valve(s) if qualified to do so. Contact
DHI
Authorized Service Provider.
(6.1)
Test pressure continuously
decreases even with all valves
closed.
Leak in
OUTLET valve
, leak in
PDVV (-) valve(s)
or
pneumatic circuit, leak in
OPG1 hydraulic circuit or leak
in test volume to which OPG1
is connected.
Identify and correct leak in test volume
if present. Isolate leak to
OUTLET
valve
or
PDVV (-) valve(s)
by
checking if pressure continues to
decrease when PDVV is in minimum
end of stroke position. Replace or
repair valve(s) if qualified to do so.
Contact
DHI
Authorized Service
Provider. (6.1)
Test pressure takes too long to
stabilize or will never stabilize.
You are observing normal
evolution of pressure in an
uncontrolled static volume,
excess gas in hydraulic circuit.
Reduce test volume. Increase
stability of test tubings and vessels.
Wait longer for stability. Overshoot
test point and return to reduce
stabilization time. Reduce reference
reading resolution to appropriate level.