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Calibration
Calibration Menu
4-10
Model 5030 SHARP Monitor Instruction Manual
The Zero/background of the nephelometer is measured by placing the inlet
adapter and HEPA filter at the inlet of the instrument. To zero the
nephelometer, proceed according to the following displays:
(for example, 1.3 μg/m
the Nephelometer reading to stabilize after disturbing the inlet connections.
The other two values appearing on this screen is the long-term beta
concentration under C14 (for example, 2.5 μg/m
concentration to the right of CONC (for example, 0.7 μg/m
zero the nephelometer, press ZERO on the keypad and the following screen
will appear:
Performing a SPAN Calibration of the Nephelometer is initially done in the
factory. During this SPAN Calibration a master nephelometer,
gravimetrically calibrated to ISO Fine Test Dust 12103-1, is placed
immediately upstream of the Model 5030 SHARP. During calibration the
test dust is delivered to the test assembly, and once a stable concentration is
achieved the technician will press SPAN on the Model 5030 menu. During
this period, the Model 5030 will calculate a one-minute average from the
nephelometer while the display counts down from 60-seconds to zero. At
the end of the test run, the average concentration from the master
Nephelometer is enlisted using the +/- keys. Press NEXT.
To begin the Nephelometer Zero/Calibration,
make sure the HEPA filter is installed at the inlet
and press YES.
At this next screen, you can record the as-found
digitized analog signal value under ANALOG
(for example, 205 LSB), and the as-found one
minute average zero measurement under NEPH
3
). Generally the user should allow 3-5 minutes for
After pressing ZERO, the screen will begin an
automatic 60-second average of the nephelometer
operating on the 0-1,000 μg/m
range. The counter is in the lower right hand of the
screen.
After the first range is zeroed, the second Range
3
(0-10,000 μg/m
) is independently zeroed over a
20-second period.
Now the Nephelometer background is zeroed for
both ranges of measurement. Another five minute
measurement cycle can be performed and
compared to the "as found" values.
3
) and the current hybrid
3
). In order to
3
concentration
Thermo Fisher Scientific
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