42 Chapter 4
3. Select PortaCount from the Main menu and select Daily
Check from the PortaCount menu . The Daily Check screen
will be displayed.
4. If this Daily Check is to include a classifier, check for a
Model 8048 with N95 enabled, click N95-Companion. Otherwise
skip this step.
5. The automated Daily Check program will give you step-by-step
instructions. First, remove the HEPA filter from the clear sample
tube if one is connected and press the START button.
6. The first check is the Particle Check, which determines if the
PortaCount Fit Tester is working and if the concentration of
particles in the ambient air is sufficient to conduct fit testing.
7. If the “N95 enabled” box is selected, the Particle Check is
immediately followed by the Classifier Check. The Classifier
Check verifies the N95-Companion™ Technology Classifier is
functioning properly.
8. The next check is the Zero Check, which provides assurance that
there are no leaks in the system. You will be instructed to attach
the HEPA filter to the clear sample tube and press CONTINUE on
the screen to start the Zero Check.
9. If the Zero Check fails, see Chapter 7. If the PortaCount Fit
Tester fails the Zero Check, any fit tests you conduct may result
in lower fit factors than would be measured otherwise. The risk is
that you may fail people who have good fits, thereby wasting time
and effort. There is no possibility that failing the Zero Check could
result in overstated fit factors (i.e., may pass people who have
bad fits). This is because any particles leaking into the
PortaCount Fit Tester are interpreted as respirator leakage,
resulting in lower fit factors.
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