Calibration
HI and LO Multi-Point Calibration
4-8
Model 410
i
Instruction Manual
Thermo Fisher Scientific
Note
If performing a multi-point calibration after a “bad” calibration or
changing ranges it is recommended to start off with default values for the
Cal point coefficients.
▲
To set default values, from the Main Menu select Service Mode >
Hi
Multi-Point Cal
or
Lo Multi-Point Cal
. From Hi or Lo Multi-Point Cal,
select
Default Coef
and press
. The instrument will automatically
reset the default values.
Use the following procedure to adjust cal points 1, 2, and 3.
Adjust the zero air flow and the CO
2
flow from the standard CO
2
cylinder to provide a diluted CO
2
concentration of approximately
80% 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.
1.
Allow the instrument to sample this CO
2
concentration standard until
a stable response is obtained.
2.
From the Main Menu select Service Mode > Lo Multi-Point Cal >
Cal
Point 1
.
3.
Use
to move the cursor and
to increment or
decrement the digit values until they match the concentration being
introduced to the instrument. Press
.
The instrument will perform a series of calculations and save the new
parameters.
4.
Press
to back up a step in the Service Mode menu.
5.
Repeat Step 1 for a 50% concentration of the upper range.
6.
Select Cal Point 2.
7.
Use
to move the cursor and
to increment or
decrement the digit values until they match the concentration being
introduced to the instrument. Press
.
Default Coefficients
Cal Point 1, 2, and 3
Adjust
