Nephelometer Zero And Calibration - Thermo Scientific 5030 Instruction Manual

Nephelometer Zero and
Calibration
Thermo Fisher Scientific
MASS = Instantaneous Mass
QLF = Quick Lock Filter for the mass
CONFID = Confidential Interval
foil holder and immediately insert the filter tape from the left. Should the
user not have sufficient time to replace the filter tape, the Mechanic Control
in the Service menu can be used. Press NEXT to proceed.
The Model 5030 SHARP has a nephelometer (aerosol light scattering
sensor) built-in upstream of the beta attenuation measurement chamber
and downstream of the instrument sample delivery tube. This nephelometer
is calibrated for zero and span in the factory using a HEPA filter and ISO
Fine Test Dust 12103-1, A-2, respectively. Of the two measurements, it is
more important to perform periodic checks on the zero performance of the
instrument.
Although field tests have indicated both a stable zero and span
measurement, it is more likely that the nephelometric chamber could
increase in background over time, thus affecting both zero and span
measurements. However, due to the nature of this hybrid method it is only
necessary to perform periodic Zero Calibrations on the Model 5030
SHARP, thereby leaving the aerosol response to be calibrated by the
long-term beta attenuation measurement.
When the zero is complete, the beta
attenuation measurement head will remain
closed. Remove the zero/null foil and insert
with the span foil (for example, 1442 μg). Press
NEXT to continue or press ABORT to stop the
foil calibration.
The span foil calibration procedure is now
active. After 200 seconds the calibrations
~
procedure should end.
After the span calibration, the screen will show
the OLD and NEW mass calibration factors.
Press NO, if you DO NOT want to change, or
press YES to store the new calibration factor.
After selecting YES, the screen will indicate the
measurement head is opening. You may now
remove the span foil and place it into its
protective case. Thereafter, you may remove the
Model 5030 SHARP Monitor Instruction Manual
Calibration
Calibration Menu
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