Maintenance
23
Performing the Maximum Fit Factor Check
Make sure all previous checks have been completed successfully
before proceeding.
Put the P
ORTA
C
OUNT
into fit test mode. If the small HEPA filter
supplied with the P
ORTA
C
OUNT
is not already attached to the
sample hose coming out of the sampling pendant, attach it now. Do
not proceed until the HEPA filter has been on the sample hose for
at least 30 seconds.
Start a fit test by pressing the Test Start/Stop key on the
P
ORTA
C
OUNT
. This causes the instrument to do a fit test on the
HEPA filter, thereby simulating a perfect respirator. The result
should be a very high fit factor of at least 200. A fit factor of 200 is
the highest number that can be displayed when N95-Companion is
in use. If the instrument is being used without software, the word
“Fit Factor” will flash when a fit factor over 200 is computed.
A value below 10 suggests that the switching valve inside the
sampling pendant is stuck on the ambient side. See the chapter on
maintenance.
A “Low Particle Count” message indicates that the valve inside the
sampling pendant is stuck on the sample (mask) side. See the
chapter on maintenance.
A value between 10 and 200 indicates a leak someplace in the
system. Inspect all tubing and hose connections.
Periodic Maintenance
The following components of the N95-Companion require periodic
maintenance.
•
Flexible tubing
•
Pendant switching valve
•
Water trap
•
Particle classifier
There are no
other
user-serviceable components inside the N95-Companion.
Do
not
attempt to adjust any components except those described in this
manual or you may invalidate your warranty.
In addition to the procedures outlined below, TSI recommends annual
factory service for the N95-Companion.
Summary of Contents for N95-Companion 8095
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