6.8.4 Acoustic Phenomena at High Negative Pressure
When running the PQ100 at very high load pressures (i.e. 150 centimeters of water or
better), a metal popping sound may be heard by the user. 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.
6.9 Verifying the Flow Rate
To verify the Flow Rate while the Pump is running, a DeltaCal or TetraCal (formally
triCal) is highly recommended for Calibration and Verification of the true Actual Flow
Rate. Use section 8.7; Appendix A, Equation 2; or the "CORRECT" utility provided on
floppy diskette to calculate the corrected flow rate as shown on the
Calibration/Verification Standard.
If the flow rate is not within 2% of the "Corrected Flow Rate" a leak in the system is the
probable cause and should be inspected.
More information on the DeltaCal or TetraCal (formally triCal) may be found at
www.bgiusa.com/cal/index.htm
6.10 Resetting the Run
When a Run has been completed, and all the information from it either recorded or
downloaded via the Communications Software, the "Reset" key can be pressed to clear all
of the "Run-Time Variables". This action causes the "Elapsed Time" (ET) and the "Total
Sample" (TS) to Clear (all zero's) and also causes the Start Time Alarm Clock to default
to the next occurrence of Midnight (00:00) and the Run Time to 24 Hours. The Reset
Function does not affect the Enables for the Start Time or Run Time. Also, all "Flow
Calibrations" remain in memory.
NOTE: IF YOU SIMPLY WISH TO START A NEW RUN WITH NO CHANGES
(DEFAULT START TIME, RUN TIME, AND CALIBRATION VALUES ARE ALL
ACCEPTABLE) THEN THE ONLY ACTIONS NECESSARY AFTER RECORDING
OR DOWNLOADING THE PREVIOUS RUN DATA IS TO PRESS THE "RESET"
KEY (CLEARS ALL COUNTERS AND DEFAULTS THE RUN TIME AND START
TIME) AND PRESS "RUN/STOP" FROM THE "MAIN IDLE DISPLAY". THIS WILL
CAUSE THE PQ100 TO BEGIN A SAMPLING JOB IDENTICAL TO THE
PREVIOUS JOB.
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