Thermo Scientific 5028i Instruction Manual page 149

Thermo Fisher Scientific
instrument is in service mode. For more information on the service
mode, see "Service Mode" earlier in the chapter.
Note This adjustment should only be performed by an instrument
service technician.
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In the Main Menu, choose Service > Mass Calibration>Mass
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Coefficient or Mass Calibration B. Mass Calibration B settings
please refer to Mass Calibration as following description.
It is recommended to perform an annual mass calibration on the Model
5028i Monitor.
The foil sets must be kept in a clean container. Do not touch the foil
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window with your fingers.
The foils must not be wiped, otherwise a loss or gain of mass can
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occur thereby biasing the mass calibration.
Foils sets can be returned to Thermo Fisher Scientific for
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recalibration as necessary.
Separate foil sets are recommended for periodic QC checks,
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auditing, and calibration.
Should the user suspect the foil window(s) has been damaged,
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scratched, or coated, these foil sets should be returned to Thermo
Fisher Scientific for re-calibration.
The null foil has the same approximate mass as a clean filter spot and
the span foil is a calibrated mass increase above the null foil. Therefore,
the foils come in a set and must not be mixed with other sets since a
bias in mass calibration will occur.
Since the beta attenuation method is linear with mass increase,
the Model 5028i need not be calibrated in the exact range of beta
attenuation per filter spot. What is important, is calibrating the
corresponding beta count reduction with an increase of calibrated mass.
Note To achieve the most accurate mass calibration, the flow
temperature should be as stable as possible and therefore the instrument
should have the heating system turned off, and the instrument should
be allowed to equilibrate to shelter or ambient temperature. If the
Model 5028i is mounted within an ambient shelter, then the most
stable time of day to perform a mass calibration would be either early
morning or late afternoon.
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Model 5028i Instruction Manual
Calibration
Calibration Procedure
4-7