Labconco XPert Nano Enclosures 38876 Series - Manual (Page 37)

Chapter 6: Maintaining the Nano Enclosure
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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 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.
NOTE: For duct connected Nano Enclosures, place the sampling nozzle in
the center of the remote blower exhaust.
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 per the averaging technique outlined in Chapter
3 and adjust the speed control slowly for the desired speed. Allow the speed
to stabilize and re-measure the inflow velocity to confirm.
5. Replace the front panel and tighten the screws.
Calibrate and Operate the Airflow Monitors
Labconco Airflow Monitor/Airflow Switch Operation:
The Guardian Airflow Monitor (LED) consists of a circuit board and an airflow
switch. This switch indicates airflow as safe or low. It does not provide an actual
face velocity, but a small setscrew in the back of the sensor can adjust the airflow
level that it classifies as “good/safe” or “low/alert.”
The circuit board provides power to the sensor and also contains a “safe (green)”
and “alert (red)” airflow LED indicators, as well as a “SILENCE ALARM” button
to quiet the audio alarm. When first powered up, the PCB will light both red and
green LED indicators and sound the alarm to indicate it is working. After 5
seconds, the air monitor will indicate either good or bad airflow based on what the
connected airflow switch detects. For low airflow, the unit will wait for 10 seconds
of bad indications before it sounds both the audio alarm and the red “alert” LED
indicator. If the “SILENCE ALARM” button is pressed, the audio alarm will be
silenced, but the red “alert” LED will remain on. The alarm is silenced indefinitely