Labconco Type C1 Biosafety Cabinet Models 30468 - Manual (Page 85)

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Inflow Velocity Calculation - Secondary Method
If the primary method cannot be performed, the secondary inflow calculation method
should be used. The secondary method uses a hot wire thermal anemometer. In this
method, the sash is lowered, and a series of velocity readings are taken at the front of
the unit.
NOTE: You must use Labconco Certifier Kit, Labconco P/N 3858403 to
perform this test properly. Qualified certifiers can obtain this kit by
contacting Labconco Customer Service Department at 800-821-5525.
For each model Purifier, the sash should be closed until the appropriate marked
template contacts the sash stop and the bottom edge of the sash, as shown below in
Figure 5-10.
The thermal anemometer probe should be positioned such that the distance from the
bottom of the probe holder to the center of the sensor element equals “Sensor Distance”
as shown in Table 5-5. Use the marks on the 6-foot templates, or a scale as shown in
Figure 5-11 & 5-12 below.
Figure 5-10
Measuring the restricted access opening
height, using the appropriate template.
Ensure that the bottom of the template is
seated in the sash stop.