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Use the following procedure to calibrate points 1, 2, and 3:
1. Adjust the zero air flow and the CO
cylinder to provide a diluted CO
of the upper range limit (URL) of the instrument. The total air flow
must exceed the total demand of the analyzer connected to the output
manifold to ensure that no ambient air is pulled into the manifold vent.
The exact CO
concentration is calculated from:
2
[CO
]
2
OUT
Where:
[CO
]
= diluted CO
2
OUT
[CO
]
= concentration of the undiluted CO
2
STD
F
= flow rate of CO
CO2
F
= flow rate of dilution air corrected to 25 °C and 760 mmHg, L/min
D
2. Allow the instrument to sample the CO
response is obtained.
3. From the Home Screen press Calibration>Advanced
Calibration>Multipoint Calibration>Point 1.
4. Enter the span concentration being introduced to the instrument. Press
Calibrate.
The instrument will perform a series of calculations and save the new
parameters.
flow from the standard CO
2
concentration of approximately 80%
2
(
[CO
x
]
F
2
CO
2
STD
=
(
+
)
F
F
D
CO
2
concentration at the output manifold, ppm
2
standard, ppm
2
standard corrected to 25 °C and 760 mmHg, L/min
2
concentration until a stable
2
Calibration
Calibration
2
)
410iQ Instruction Manual
4-7
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