APPENDIX B. TROUBLESHOOTING
Problem: Pressing the "Run/Stop" key causes the unit to shutdown.
Answer: This indicates that the PQ100 is now powered off and ready to begin a sample run
at the designated Start Date and Time. It means that the enable for the Start Date
and Time is set to "On" (See Section 6.1). Be sure that the Start Date and Time
are set correctly.
Problem: The Actual Flow Rate is not what is indicated in the Display.
Answer: Variations in Atmospheric Conditions (B.P. and Temp.) will cause slight
variations in flow as displayed on the Calibration Device however the PQ100 will
be displaying "True Flow Rate". If large variations exist, or if the variation is
different from that of the calculated "Corrected Flow Rate" as described in the
Calibration Equations Section of this manual then, the unit requires service.
Problem: I hear a popping metal sound as the PQ100 load pressure increases.
Answer: When running the PQ100 at very high load pressures (i.e. 150 centimeters of
water or better), a strange metal popping sound may be heard by the user. Do not
be concerned! This is merely the internal pulsation dampner (Plenum) adjusting
its chamber area. The PQ100 will alert you as to the nature of any problems via
the shutdown messages as described in APPENDIX E.
Problem: The flow rate does not seem to hold when additional pressure is added to the load
(usually tested using a pinch clamp).
Answer: This is usually caused by a leak somewhere between the PQ100 Inlet and the
calibration measuring device. Make sure that the hose adapter is firmly tightened
in the PQ100 inlet, check the inlet mechanism and filter holder. You can usually
isolate the suspect device by starting at the PQ100 inlet and working your way
out.
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