Thermo Scientific 5028i Instruction Manual page 145

Calibration
Calibration Procedure
Ambient Temperature
Using a NIST-traceable thermometer as a reference collocated next to
the ambient RH/temperature sensor assembly, measure and compare
three individual readings between both the reference and the 5028i
response. Taking an average of both sets of readings, calculate the
average difference between the two readings and record that as your
offset. This OFFSET should now be entered in the screen below:
Be sure to save the entry and compare the values once more. If it appears
that the temperature has shifted into the wrong direction, change the
sign of your offset value.
Using a NIST-traceable hygrometer as a reference collocated next to the
Ambient Relative Humidity
ambient RH/temperature sensor assembly, measure and compare three
individual readings between both the reference and the 5028i response.
Taking an average of both sets of readings, calculate the average
difference between the two readings and record that as your offset. This
OFFSET should now be entered in the screen below:
Be sure to save the entry and compare the values once more. If it appears
that the temperature has shifted into the wrong direction, change the
sign of your offset value.
Assuming the instrument cover has been removed, the heater has been
Flow/Flow B Temperature
turned off and removed from the instrument and the instrument has
been sampling room temperature air for 1-hour, this calibration can
now proceed.
Using a NIST-traceable thermometer as a reference collocated next
to the small sample tube inlet on top of the instrument, measure and
compare three individual readings between both the reference and the
5028i response. Taking an average of both sets of readings, calculate
the average difference between the two readings and record that as your
offset. This OFFSET should now be entered in the screen below:
Thermo Fisher Scientific Model 5028i Instruction Manual 4-3