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24-Hour Zero and
Detection Limit
Thermo Fisher Scientific
CAUTION If operational parameter changes have been made within the
Operations menu, they must be saved via the CALIBRATION menu in
order to become new default settings. Otherwise, the original parameter
settings will be restored when RELOAD is used within the CALIBRATION
menu.
Perform the following steps to thoroughly evaluate the absolute zero and
detection limit of the Model 5030.
1. Keep the instrument in the Calibration Mode (Status = 0070).
2. Maintain the HEPA filter at the inlet.
By conducting this test, the zero measurement should run for approximately
24 hours. After performing this test, the hourly data should be downloaded
from the instrument memory. The average of 24 consecutive measurements
would be the 24-hour absolute zero of the instrument.
With a sample population of 24, one-hour measurements, an hourly
detection limit can be calculated according to:
After the first range is zeroed, the 2nd Range
3
(0-10,000
g/m
) is independently zeroed over a
μ
20-second period.
Now the Nephelometer background is zeroed for
both ranges of measurement. Another 5-minute
measurement cycle can be performed and
compared to the "as found" values. Press NEXT
until the following screen appears:
Press YES.
The nephelometer zero calibration has now been
set. Press NEXT
DL
2
1 hr
Model 5030 SHARP Monitor Instruction Manual
Installation
Menu Tutorial
2-17
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