Thermo Scientific 48i Instruction Manual page 142

Calibration
HI and LO Multi-Point Calibration
4-8 Model 48i Instruction Manual
[CO
Where:
[CO] = diluted CO concentration at the output manifold, ppm
OUT
[CO] = concentration of the undiluted CO standard, ppm
STD
F = flow rate of CO standard corrected to 25 °C and 760 mmHg, L/min
CO
F = flow rate of dilution air corrected to 25 °C and 760 mmHg, L/min
D
2. Allow the Model 48i to sample this CO concentration standard until a
stable response is obtained.
3. From the Main Menu select Service Mode > Lo Multi-Point Cal > Cal
Point 1.
4. Use to move the cursor and
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.
5. Press to back up a step in the Service Mode menu.
6. Repeat Step 1 for a 50% concentration of the upper range.
7. Select Cal Point 2.
8. Use to move the cursor and
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.
9. Press to back up a step in the Service Mode menu.
10. Repeat Step 1 for a 20% concentration of the upper range.
11. Select Cal Point 3.
( [CO ] x
F
CO
STD
] =
OUT
( + )
F F
D CO
.
.
)
to increment or
to increment or
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