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Instruction 24-9448 4-5
Operation
4.5 Performing a Combustion Test
Ensure that the following has been completed, and then proceed with the
combustion test as described below:
• Turn ON analyzer and allow it to warm up (Section 4.2).
• Select fuel being burned (Section 4.3).
• Inset probe into stack (Section 4.4).
• If necessary, insert optional primary air thermocouple into combustion-
air stream of burners that use an outside source of combustion air.
1. Press the RUN/HOLD button to start the test.
You should hear the pump start running and
see the word RUN appear at the top of the
Combustion Test screen.
2. Press the ENT button to view the various
combustion test screens that contain the data
listed in Table 4-1 on Page 4-6.
The screens to the right show typical combus-
tion test data for an analyzer equipped with
O
2
, CO
LOW
, NO and NO
2
sensors.
TIP: Use the zoom-display to show only the
values of O
2
, CO, and efficiency in large char-
acters. Refer to Section 3.13.
Sensor Indicators: The following indicators
appear in the sensor's data field depending on
certain conditions:
(∗ ∗ ∗) Sensor that is not calibrated or defective.
(XXX) Sensor overrange
(
- - -
) The calculated data cannot be displayed
because the measured data necessary to make
the calculation is out of range (i.e., oxygen level
above 16%).
3. Press ENT until T-STK is displayed. Loosen
thumbscrew on probe stop and move probe in
and out of the stack until the stack’s core tem-
perature (hot spot) is located as indicated
by the highest T-STK reading; then tighten
thumbscrew to prevent further probe move-
ment. Locating the highest stack temperature
is very important for accurate efficiency calculations.
RUN NATURAL GAS
O2 4.0 %
CO 12 ppm
EFF 82.6 %
CO2 9.5 %
T-STK 374 °F
T-AIR 68.0 °F
EA 21.3 %
CO(3) 13 ppm
PRINT MENU SAVE
F1 F2 F3
RUN NATURAL GAS
NO 18 ppm
NO2 6 ppm
NOx 24 ppm
NO(3) 19 ppm
NO2(3) 1 ppm
NOx(3) 25 ppm
PRINT MENU SAVE
F1 F2 F3
O2 4.0 %
CO 12 ppm
EFF 82.6%
PRINT MENU SAVE
F1 F2 F3