
ECA 450 Operation
Instruction 0024-9400
2.4 Performing a Combustion Test
Important! When measuring nitrogen dioxide (NO
2
) and sulfur dioxide (SO
2
),
it is recommended that a Sampler Conditioner (Bacharach P/N 0024-7224) be
used to assure accurate readings.
1. If not already done, turn on analyzer (Section 2.1) and select a fuel
(Section 2.3).
2. See Figure 2-1. Make a ½-inch sampling hole in stack to accommodate
probe stop. Locate this sampling hole before any draft diverter/hood or
barometric damper so that flue gasses are not diluted and stack
temperature has not been decreased by surrounding air used to balance
the draft. Note that as the distance between the last heat exchanger and
sampling point increases, the calculated combustion efficiency will falsely
increase due to heat loss by convection from the flue or stack.
3. If burner’s primary-air temperature is different from that of room air, be
sure to either immerse primary-air thermocouple into primary-air
stream, or take a primary-air temperature measurement using either the
probe’s thermocouple or a thermometer (Section 2.14).
4. See Figure 2-2. Screw probe stop into sampling hole. Next, insert probe
through probe stop, positioning its tip near center of stack. Secure probe
by tightening the probe stop’s thumbscrew.
5. Press RUN key. You should hear the pump start running and see the
word RUN appear in the upper-left hand corner of the display.
6. The ECA 450 is now continuously measuring and calculating the values
shown in the Combustion Test RUN screen.
Use
∧∨ keys to scroll through the following typical set of data (note that
depending on which sensors are installed, some of the data listed below
may not be displayed).
Figure 2-1. Sampling Hole Location Figure 2-2. Installing the Probe
FLUE GAS FLOW
(Downstream)
DRAFT
DIVERTER/
REGULATOR
SAMPLE
HOLE
(Upstream)
FURNACE
BREECHING
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