Labconco Logic Vue User Manual page 51

Locate the height of anemometer probe 12 inches (30.5 cm) above the work surface.
Verify the enclosure's blowers are on, and have reached a stable level (generally when
the Please Wait notification is dismissed from the display, which is about 90 seconds).
The lower sash on the rear of the enclosure must be closed. The lower sash on the
front of the enclosure must be open. Verify no alarms are active on the display.
Place the anemometer stand and anemometer on the first test point. Verify the
anemometer's time constant is set to 10 seconds or higher.
Take a velocity reading with the anemometer at each test point. Reference Table 4-1 to
verify the total number of test points sampled is correct for the model under test.
Average all velocity readings. The average shall be one of the Average Downflow
options listed in Table 4-1.
Cabinet Width
(Feet)
4'
6'
If large equipment is placed inside the enclosure, and the equipment cannot have its
outer panels removed to allow downflow air to flow through the equipment, it is
recommended to set the average downflow velocity no higher than 40 fpm (0.20 m/s) to
reduce high velocity zones between the equipment and the Front and Rear Hatch walls.
See Equipment Placement
In some cases, an instrument may not be easily removable from the enclosure for each
certification. In such cases, Labconco recommends collecting downflow measurement
points in accordance with the IEST-RP-CC002.4 methodology, with measurements
occurring 6 inches (150 mm) downward from the HEPA filter diffuser.
Should the instrument obstruct any given point, the certifier should at minimum establish
safe downflow values at the front and to the sides of the instrument. An airflow
visualization study (AVS) can assist with validation of containment and personnel
protection after setting the enclosure's airflows.
If the Average Downflow needs to be adjusted, see
Supply Blower speed.
Remove the tools and anemometer, along with any downflow test point markings on the
work surface.
Catalog Number
33004xx
33006xx
later in this section for more details.
Test Average Downflow
Points (+/- 3 fpm or 0.015 m/s)
40, 45, or 50 fpm
28
(0.20, 0.23, or 0.25 m/s)
40, 45, or 50 fpm
44
(0.20, 0.23, or 0.25 m/s)
Section 8: Calibration
51
Table 4-1
to adjust the