TSI Instruments N95-Companion 8095, Operation And Service Manual

Page: 29 / 47

21
Chapter 4
Maintenance
Overview
The N95-Companion and P
ORTA
C
OUNT
Plus both require daily and periodic
maintenance. Refer to the P
ORTA
C
OUNT
Plus Operation and Service Manual
for P
ORTA
C
OUNT
Plus maintenance information. The N95-Companion
maintenance information appears below.
Daily Checks
The daily checks are designed to determine if the instrument is working
properly. They must be done in the order specified. There are four daily
checks:
•
Particle check
•
Classifier check
•
Zero check
•
Maximum fit factor check
Note : FitPlus for Windows software can be used to automate the daily
checks if desired.
Performing the Particle Check
After you set up the N95-Companion and P
ORTA
C
OUNT
Plus, run
the particle generator for at least 15 minutes, touch the count switch
on the P
ORTA
C
OUNT
Plus. The concentration number will appear in
the P
ORTA
C
OUNT
Plus display. You must have a particle count of at
least 70 to pass this test.
Note: The N95-Companion will not operate at concentrations
below 70 particles per cc. Do not be concerned if
concentrations are higher than 250 to 300 particles/cc. This
may simply indicate a high concentration of naturally
occurring aerosol. Also, if concentrations are this high, you
may be able to operate the particle generator at a lower
setting, or not at all. Refer to the Model 8026 Particle
Generator Operation and Service Manual for more
information.