Labconco Protector 3930000 User Manual page 53

5. To complete the CAL CONFIGURATION, be sure to enter "DONE".
If needed, refer to the Configuration procedure provided on the
following page for additional details.
6. To start the calibration mode, enter "CALIBRATION" mode on the
display from the SETUP menu.
7. Follow the instructions on the display and simulate the low exhaust
volume by fully opening the sash. You may measure the average
face velocity for the low calibration set point or utilize the calculated
value provided in the chart above. The average face velocity for the
low set point is accurately measured by dividing the opening of the
enclosure into equal area grids consisting of at least 9 data
collection points and measuring the velocity at the center of each
grid with a calibrated thermo anemometer. Enter the low value on
the display. Be careful not to block the opening. The low exhaust
volume calibration will take about 5 seconds.
8. Now simulate the high exhaust volume by fully closing the sash to
its normal operating position. Measure the average face velocity
for the high calibration set point to confirm that the source of
constant air volume is providing the desired face velocity for the
enclosure. The average face velocity for the high set point is
accurately measured by dividing the opening of the enclosure into
equal area grids consisting of at least 3 data collection points and
measuring the velocity at the center of each grid with a calibrated
thermo anemometer. Enter the high value set point on the display.
The high value must be at least 10 fpm greater than the low value.
The high exhaust volume calibration will take about 5 seconds.
9. Be sure to enter "DONE" after successfully completing the low and
high calibration set points.
10. Once calibration is completed, go to "RUN" and hit "ENTER". The
value should read close to the high calibration set point.
11. With the sash fully open, the Digital 1000 monitor should go into
"RED LED" low air alarm if successfully calibrated.
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Chapter 6: Maintaining Your Enclosure
49