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Calibration
Zero and Span Check
Thermo Scientific
42iQD Instruction Manual
4-17
The analyzer requires initial and periodic calibration according to the
procedures outlined in this manual. Initially, the frequency of the
calibration procedure should be determined by the stability of the zero and
span checks, which may be run daily. You should generate a new
calibration curve when zero and span checks indicate a shift in instrument
gain of more than 10 percent from that determined during the most recent
multipoint calibration. You can adjust the frequency of calibration and
even zero and span checks appropriately as you gain confidence with the
instrument.
It is recommended to have a quality control plan where the frequency and
the number of points required for calibration can be modified on the basis
of calibration and zero and span check data collected over a period of time.
Note however, that the EPA requires a minimum of one multipoint
calibration per calendar quarter. Such a quality control program is essential
to ascertain the accuracy and reliability of the air quality data collected and
to alert the user if the accuracy or reliability of the data should become
unacceptable. A compilation of this kind might include items such as dates
of calibration, atmospheric conditions, calibration factors, and other
pertinent data.
Use the following procedure to perform a zero and span check.
1.
Connect the zero gas to the SAMPLE bulkhead in a standard
instrument or to the ZERO IN bulkhead in a 42iQD
equipped with
the zero/span and sample solenoid valve option.
2.
Allow the instrument to sample zero gas until a stable reading is
obtained on the NO
x
channel, then record the zero readings. Unless the
zero has changed by more than ±0.010 ppm, it is recommended that
the zero not be adjusted. If an adjustment larger than this is indicated
due to a change in zero reading, a new multipoint calibration curve
should be generated.
3.
Attach a supply of known concentration of NO and NO
2
(usually
generated via an NIST traceable NO working standard and a GPT
system) to the SAMPLE bulkhead (or SPAN bulkhead for instruments
equipped with the zero/span and sample solenoid valve option) on the
rear panel.
4.
Allow the instrument to sample the calibration gas until a stable
reading is obtained on the NO
x
channel. If the calibration has changed
Zero and Span
Check
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