Labconco XPert Filtered Balance Stations 3962622 - Manual (Page 28)

Chapter 4: Performance Features and Safety Precautions
Product Service 1-800-522-7658 24
3. Upper Dilution Air Supply provides bypass air from above the work area.
This feature constantly bathes the inside of the sash with clean air and
reduces powders, particulate materials and chemical fumes along the sash
plane, near the critical breathing zone. Five to seven percent of the
required air volume is introduced through the upper dilution air supply.
The upper dilution air supply also reduces stagnant pockets of air in the
upper interior. See Figure 4-2.
4. Zoned Rear Perforated Baffle directs horizontal laminar air streams to
the three-zoned sections of the perforated baffle. The three-zoned sections
have increasingly more open area at the bottom that help form laminar
airflow. This minimizes the potential for air to roll forward preventing
contaminants from moving toward the sash opening. The majority of
contaminants are highly diluted, captured and removed on the first pass
through the enclosure. Rear perforated baffle may be tilted or removed for
ease in cleaning. See Figures 4-1 and 4-2.
5. Side-Entry Air Foils allow turbulence-free air to enter the enclosure from
the sides and allow clean air to sweep the interior walls of the enclosure.
See Figures 4-1 and 4-2.
6. Ergonomic Slope provides maximum visibility, and comfort reduces glare,
thereby minimizing operator fatigue. See Figure 4-1.
7. Internal Depth of 23" or 30" and 22.8" or 32" Interior Height provides
necessary depth and height to support modern balances and other auxiliary
equipment without extending outside the enclosure or resting on the lower air
foil. See Figure 4-1. The 2' and 3' sizes are available with 23" internal depth
and 22.8" interior height. The 4' sizes are available in 22.8" or 32" interior
height and are available with 23" or 30" interior depth. The 5' and 6' sizes
have standard 32" interior height and are available with 30" interior depth.
8. Safety Glass Sash has a wiping seal to contain contaminants and features a
spring-loaded latch to secure sash open for loading and cleaning. The sash
must be down for normal operation. See Figure 4-1. The 5' and 6' units
utilize a gas spring assist in place of the latch.
9. Utility Ports with Iris allows electrical cords and data cords to pass
through the back of enclosure without leaving a large hole for contaminants
to escape. The enclosure ships with solid plugs. Iris plugs are included
with the User’s Manual. See Figure 4-1 and 4-2.
10. Accessory Guardian Airflow Monitor or Guardian™ 1000 Digital
Airflow Monitor continuously monitors airflow. An audio/visual alarm
alerts the user to low airflow conditions. The Guardian 1000 Digital
Airflow 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.