Labconco PURICARE Procedure Station Models 34812xx - Manual (Page 95)

Page 95 of 197
with its performance in a calibrated wind tunnel. This data should be
available from the calibrator of the thermal anemometer.
3. Calculate the manufacturers recommended correction factor(s) to correct for
local conditions of temperature, humidity, barometric pressure, altitude, etc.
4. Take a series of inflow velocities by placing the probe holder so that its
center mark aligns with the marked test holes. As shown in Figure 6-12.
5. Apply the wind tunnel correction and local condition correction factors to the
thermal anemometer readings.
6. Multiply the individual readings by the correction factor shown in Table 6-5.
7. Average the corrected readings.
8. The resulting value is the inflow volume in cubic feet per minute (CFM). In
order to convert this value to the average inflow velocity of feet per minute
(FPM), divide the volume by the sash open area given in Table 6-5. The
resulting value will be the calculated average inflow velocity in FPM.
Figure 6-11
Marking the test point locations.
Mark the 6
th hole from either end,
then mark every 9 th hole until the
number of marked points equal the
width of the cabinet in feet.
Repeat for the other side of the
grille.
Figure 6-12
Measuring the Secondary Inflow
Velocity.
Note the center of the probe holder
aligns with the test points marked
earlier.
Acceptance
Average inflow shall be 105 +/-5 FPM.