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Equipment Required
Thermo Scientific
Chapter 4
Calibration
This chapter describes the procedures for calibrating the analyzer and
describes the required equipment.
The 43iQ requires initial and periodic calibration according to the
procedures described in this chapter. A quality control plan that allows the
frequency and number of calibration points to be modified depending on
calibration and zero/span check data should be implemented. Such a
quality control program is essential to ascertain the accuracy and reliability
of the air quality data collected. The data compiled for such a program
might include items such as dates of calibration, atmospheric conditions,
control settings and other pertinent data. For more detailed quality
assurance guidelines, see the Quality Assurance Handbook for Air Pollution
Measurement Systems, published by the U.S. EPA, Research Triangle Park,
NC, 27711.
There are a number of conditions which should be met prior to a
calibration or a zero/span check. First, the instrument should have at least
30 minutes to warm up and stabilize. Second, the range used during the
calibration or zero/span check should be the same as that used during
normal monitoring. Third, all operational adjustments to the instrument
should be completed prior to calibration. Fourth, all parts of the gas flow
system, such as sample lines, and particulate filters, which are used in
normal monitoring should also be used during calibration. Finally, it is
recommended that the recording devices and outputs used during normal
monitoring be calibrated prior to the instrument calibration and that they
be used during the calibration or the zero/span check.
The following equipment is required to calibrate the instrument:
Zero air
G
Calibration gas
G
Note In order to reduce the possibility of interferences during calibration,
all zero gas supplied to the instrument during calibrations should use air as
the zero gas and not nitrogen. The same recommendation also applies to
span gases supplied, where the calibration gas is supplied with a known SO
concentration with the balance of gas as air and not nitrogen.
2
L
43iQ Instruction Manual 4-1
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