Calibration
HI and LO Multi-Point Calibration
4-8
Model 48
i
Instruction Manual
Thermo Fisher Scientific
)
F
+
F
(
)
F
x
]
[CO
(
=
]
[CO
CO
D
CO
STD
OUT
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 mmHg, L/min
F
D
= flow rate of dilution air corrected to 25 °C and 760 mmHg, L/min
2.
Allow the Model 48
i
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
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.
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
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.
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.
