Labconco Logic+ A2 Technical Manual page 81

7. Place the thermal anemometer, now secured to the Labconco Holder, onto the
grille. The two pins in the Holder will drop into two holes on the grille. The
thermal anemometer probe should line up with the test point mark made earlier.
Start by placing the anemometer and Holder at the far left test point mark. See
Figure 10-33 for reference.
Thermal anemometer
probe in Holder
11. Start the blower(s), and let the cabinet operate for at least 5 minutes. After the
warm-up period expires, the biosafety cabinet will display a sash alarm. This is
because the sash is at the restricted height required for this test. Press
[OK/MUTE] to silence the alarm for 5 minutes.
12. This test requires the anemometer to provide highly accurate results. Establish
the necessary correction factor to the thermal anemometer from its calibration
performance test in a calibrated wind tunnel. This should be available from the
calibration institution or company used to calibrate the thermal anemometer.
Calculate the thermal anemometer manufacturer's recommended correction
factor(s) for conditions of temperature, humidity, barometric pressure, and
altitude.
13. Set the anemometer's time constant to 10-15 seconds for greater data stability.
14. Take one velocity reading at each of the marked test points.
Figure 10-33
81