Chapter 4 Calibration
4-5
)
F
+
F
(
)
F
x
]
[CO (
=
]
[CO
COD
CO
STD
OUT
(1)
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 choose Calibration. From the Calibration menu choose
Calibrate Span. The first line of the display shows the current CO concentration
reading. The second line of the display shows the CO range and the third line is
where the CO concentration is entered. Enter the CO calibration gas concentration
using the
↑
↑↑
↑
,
↓
↓↓
↓
,
←
←←
←
, and
→
→→
→
pushbuttons. Press
ENTER
to calibrate the CO reading to
the CO calibration gas.
recorder response (percent scale) = (([CO]
OUT
x 100)/URL) + Z
CO
(2)
Where:
URL = nominal upper range limit of the Model 48C's operating range
Z
CO
= Model 48C's response to zero air, %scale
3. Record the CO concentration and the Model 48C's response.
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