Labconco TXE Tall XPerEnclosure 3892022 - Manual (Page 29)

Chapter 6: Maintaining Your TXE
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6. Set the valve to “DOWNSTREAM.” Place the palm of your hand over the
sampling port of the pistol. There should be a strong vacuum at this port. If the
vacuum is weak, contact Air Techniques Hamilton Associates.
7. Turn the enclosure on and let it operate for a minimum of 5 minutes.
8. If necessary, adjust the speed control of the enclosure to maintain the following
airflows at 90 fpm; 2' (130cfm), 3' (200 cfm, 4' (265 cfm.), 5' (215 cfm), 6'
(260 cfm). The 5' and 6' uses two filters.
9. Position the aerosol generator discharge in the intake of the baffle inside the
enclosure.
10. Start the aerosol generator (Pressure to be +/- 1 psig). (10 psig). Ensure that
one Laskin nozzle is in the “open” position.
11. Allow the generator to operate for a minimum of 15 seconds. For all integral
motorized impeller models, scan the downstream exhaust side of the HEPA
filter by passing the sampling nozzle of the gun in slightly overlapping strokes
over the entire surface the filter, with the sampling port not more than 1 inch
from the surface of the filter media. Scan the entire periphery of the filter and
the gasket between the filter frame and the enclosure frame. Scanning shall be
done at a traverse rate of not more than 2 inches per second.
Acceptance
Aerosol penetration shall not exceed 0.01 percent measured by the photometer.
Setting the Inflow Face Velocity with the Speed
Control Adjustment
1. Remove the front panel by loosening the (2) Phillips screws on top that
secure the front panel.
2. The speed control is located on the electrical subassembly located behind
the switched control panel and below the front panel. See Figure 6-1.
3. Adjust the speed control with a small Phillips screwdriver by turning the
screw counterclockwise to increase blower speed or clockwise to decrease
the blower speed. The speed control is very sensitive, so proceed with
caution.
4. Measure the inflow velocity by averaging measurements taken in the
largest opening between doors and adjust the speed control slowly for the
desired speed. Allow the speed to stabilize and re-measure the inflow
velocity to confirm. (Recommended inflow is 80-100 ft/min.)
5. Replace the front panel and tighten the screws.