PPC2+™ Operation and Maintenance Manual
©2001 DH Instruments, Inc.
Page 146
Table 18. Troubleshooting Guide (Continued)
SYMPTOM
POSSIBLE CAUSE
SOLUTION
Poor pressure control
characterized by excessive
pressure noise at control point
and/or hunting around target.
Excessive leak present in
system.
Correct internal or external
leak or increase hold limit
(Sections 3.2.8, 3.2.6).
Poor pressure control
characterized by minor
overshooting.
Some overshooting is part of
normal operation to speed up
pressure stabilization..
Check whether overshooting is
within normal limits. Increase
test volume.
Poor pressure control
characterized by very slow
slew rate.
Test volume is too large.
Reduce test volume if slew rate
is unacceptable.
Poor pressure control
characterized by excessively
fast slew rate and
overshooting.
Test volume too small.
Increase test volume.
Poor pressure control.
Unstable or incorrect pressure
supply.
Connect regulated pressure
supply set to correct supply
pressure (Section 2.3.4).
Poor pressure control and
measurement.
The PPC2+ and/or the
connection to the test system is
contaminated with liquids.
Purge and clean affected
systems (Section 3.2.8).
Apparent inaccurate pressure
control/measure and little or no
response from reference
transducer:
Reference transducer
destroyed by overpressure.
Isolate failure and have
repaired as needed.
Apparent inaccurate pressure
measurement/control and <h>
is displayed on top line of
screen.
An unplanned “head”
correction is active or head
height or gas is incorrect.
Remove or change “head”
correction (Section 3.2.7).
Apparent inaccurate pressure
measurement/control.
Incorrect pressure units and/or
measurement mode (gauge or
absolute).
Set desired pressure units
and/or measurement mode.
Consider reference
temperature if unit is inWa
(Section 3.2.2).
Apparent inaccurate pressure
measurement/control.
Reference sensor transducer
calibration coefficients have
been altered.
Check and correct calibration
coefficients if needed
(Section 5.2).
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