Chapter 4 Calibration
4-9
Where:
[CO]
OUT
=
diluted CO concentration at the output manifold, ppm
[CO]
STD
=
concentration of the undiluted CO standard, ppm
F
CO
=
flow rate of CO standard corrected to 25
°
C and 760 mm Hg, LPM
F
D
=
flow rate of dilution air corrected to 25
°
C and 750 mm Hg, LPM
Allow the Model 48C to sample this CO concentration standard until a stable response is
obtained.
2. From the Main Menu select “Service Mode”. From “Service Mode” select “Lo
Multi-Point Cal”. From “Lo Multi-Point Cal” Select “Cal Point 1”. Use
←
and
→
pushbuttons to move the cursor and the
↑
and
↓
pushbuttons to increment or
decrement the digit values until they match the concentration being introduced to
the analyzer. Press
ENTER
. The analyzer will perform a series of calculations and
save the new parameters.
3. Press
MENU
to back up a step in the Service Mode menu.
4. Repeat step 1 for a 50% concentration of the upper range.
5. Select “Cal Point 2”
6. Use
←
and
→
pushbuttons to move the cursor and the
↑
and
↓
pushbuttons to
increment or decrement the digit values until they match the concentration being
introduced to the analyzer. Press
ENTER
. The analyzer will perform a series of
calculations and save the new parameters.
7. Press
MENU
to back up a step in the Service Mode menu.
8. Repeat step 1 for a 20% concentration of the upper range.
9. Select “Cal Point3”
10. Use
←
and
→
pushbuttons to move the cursor and the
↑
and
↓
pushbuttons to
increment or decrement the digit values until they match the concentration being
introduced to the analyzer. Press
ENTER
. The analyzer will perform a series of
calculations and save the new parameters.
11. Press
MENU
to back up a step in the Service Mode menu.
12. Select “Coefficients”.
13. Press
ENTER
. The analyzer will automatically calculate the new coefficients and
save the new parameters.
14. Repeat steps 1 through 13 for “Hi Multi-Point Cal”
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