Additional Concentration Standards; Calibration Curve - Thermo Scientific 49iQ Instruction Manual

Additional
Concentration
Standards

Calibration Curve

Thermo Scientific
1. Generate several other ozone concentration standards (at least five
others are recommended) over the scale range of the instrument.
2. For each ozone concentration standard, record the ozone concentration
as determined by the calibration photometer and record the
corresponding analyzer response.
If a 49iQ Primary Standard is being used as the calibration photometer,
use the ozone concentration as determined by the photometer and not
the value of the ozone level number.
Use the following procedure to plot the calibration curve.
1. Plot the 49iQ responses versus the corresponding ozone concentrations.
2. Connect the experimental points by using a straight line, preferably
determined by linear regression techniques.
Points that lie more than ±4% from this line are an indication of an
error in determining the calibration curve. The error may be due to a
malfunction of the calibration photometer, or a malfunction of the
analyzer being calibrated. The most likely malfunctions in both the
analyzer and calibration photometer which can give non-linear results
are leaks, a malfunctioning ozone scrubber, a dirty solenoid, or dirt in
the optical system. The calibration curve is used to reduce subsequent
ambient data.
Note To generate data of the highest confidence, it is recommended
that a multipoint calibration be performed every three months, any
time major disassembly of components is performed, or any time the
zero or span checks give results outside the limits described in
Zero and Span Checks" that follow.
Calibration Procedure
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49iQ Instruction Manual
Calibration
"Periodic
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