Filter
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29
Chapter 4: High Performance Features and Safet
y
Monitor also displays a face velocity value, provides an
RS232 output, a night setback mode and several auxiliary
relay ports. Both airflow monitors are available options on
all XPert models. See Figure 4-1 and 4-2.
11. Inherently Safe Impeller has a negative pressure plenum
that surrounds the positive pressure impeller so that if a
leak should occur, the unfiltered air is captured and
refiltered. See Figure 4-2.
12. Vibration-Isolated Motorized Impeller has vibration
isolation supports, which eliminates transfer of vibration to
the work surface. This is extremely useful in weighing
operations with precision balances. The impeller wheel is
also dynamically balanced. See Figure 4-2.
13. Speed Control regulates the speed of the motorized
impeller and is used by the certifier to validate and adjust
the inflow velocity. Located behind the front panel. See
Figure 4-2.
14. Space-Saving Design increases effective laboratory
workspace, because the impeller and HEPA filter are
contained within the enclosure, a separate filtered blower
module is not required. See Figure 4-1
15. Fluorescent Lamp is located above the work area, out of
contact with contaminated air. A safety glass window
beneath the lamp distributes the light evenly across the
work surface. See Figure 4-1.
16. Filter System Pressure Gauge indicates the total system
pressure across the HEPA filter and pressurized plenum to
help predict HEPA filter loading. See Figure 4-1.
17. Filter Clamping Bolt evenly seals the HEPA filter to the
frame of the enclosure. See Figure 4-1 and 4-2.
18. Sash. The sash is constructed of 1/4 inch tempered safety
glass. It pivots up for loading and cleaning. See Figure 4-1
19. Control Panel. The control panel, which is located above
the sash, contains the filter system pressure gauge, control
switches and the electronics. See Figure 4-1.