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Installation
Menu Tutorial
Background Zero
2-16
Model 5030 SHARP Monitor Instruction Manual
From this menu, placing a HEPA Filter at the inlet and Pressing ZERO on
the keypad can zero the nephelometer. A HEPA filter is provided with each
Model 5030 for this purpose. Furthermore, by introducing a known
concentration of aerosol to the Model 5030, a span calibration can be
performed on the nephelometer. However, for the purpose of this step only
the zero of the nephelometer should be performed.
To perform a zero measurement on the nephelometer, connect the Zero Test
Assembly (as done previously during the volumetric flow rate verification).
1. Attach the small sample tube adapter to the Model 5030 inlet.
2. Attach the inlet adapter to the sample tube.
3. Attach the flow audit adapter.
4. Attach the HEPA filter to the flow audit adapter.
5. Allow 5-minutes for the factory-zero to stabilize.
At the end of 5 minutes, the ANALOG and NEPH values should be stable.
The NEPH value should read 0.0
Nephelometer performance is within this tolerance, the acceptance test has
passed. These two (2) values can be considered the "as-found" values for the
Model 5030 zero measurement. Should the NEPH value be ±4.0
nephelometer performance can be considered marginal, and outside of this
range the nephelometer requires the background be zeroed.
It is recommended that the ANALOG and NEPH values be recorded
and control-charted in an effort to maintain any history of
background shift.
To zero the background, maintain the HEPA filter at the inlet and press
Zero.
3
g/m
, ±2.0
μ
After pressing ZERO, the screen will begin an
automatic 60-second average of the nephelometer
operating on the 0-1,000
range. The counter is in the lower right hand of the
screen.
3
g/m
. If the Model 5030
μ
g/m
μ
3
g/m
concentration
μ
Thermo Fisher Scientific
3
, the
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