EC9830 CO ANALYZER OPERATION MANUAL
3-6 98307600 Rev. C-1
3. Ensure that the analyzer is properly connected to the output recording device,
as described in Chapter 2, Installation and Operation. If necessary, go to the
INTERFACE MENU, select the ANALOG OUTPUT MENU, and select the appropriate
settings for the recording device. Offsetting the analyzer's zero indication
(OFFSET AND ZERO ADJUST) to +5% of scale is recommended to facilitate
observing negative zero drift. Exit and return to the primary screen.
4. Adjust the calibration system to deliver zero air to the output manifold. The
total air flow must exceed the total demand of the analyzer(s) connected to the
output manifold by 0.5 slpm to ensure that no ambient air is pulled into the
manifold vent. Go to the CALIBRATION MENU and select MANUAL calibration
and MEASURE mode. Check the internal zero scrubber by initiating an auto-
zero (BACKGROUND) cycle. Exit and return to the primary screen. Following the
auto-zero cycle, allow the analyzer to sample zero air until a stable response is
obtained. If the response is negative by more than 0.5% of full scale, the zero
scrubber may need to be replaced. Record the final, stable zero air response as
Z
CO
.
Note
Ecotech’s’ EC9800 analyzer family does not have zero and
span pots that physically resemble those on traditional
instruments. Zero is set automatically on all units. Span can
be set manually by adjusting the instrument readings or by
adjusting the instrument gain.
5. Adjust the zero air flow and the CO flow from the standard CO cylinder to
provide a diluted CO concentration of approximately 80% of the full scale
range of the analyzer. Ensure that the total air flow at the output manifold
exceeds the demand by 0.5 lpm. This will ensure that no ambient air is pulled
into the manifold vent. The exact CO concentration is calculated from:
COD
COSTD
OUT
FF
F]CO[
]CO[
+
=
Equation 3-1
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 the CO standard corrected to 25° C and
760 mm Hg (101 kPa), slpm
F
D
= flow rate of the dilution air corrected to 25° C and 760 mm Hg
(101 kPa), slpm.
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