Manual instruction MM850482 ed.04
12
3.2.3
Smoke Index Measurement
(optional)
This method consists of taking a gas sample from the center of the gas pipe behind the heat exchanger and
crossing it through a special filter paper.
The color of the spot on the filter is compared with a graduated (from 0 to 9) reference scale and it is called
“smoke index”.
You can type into the instruments up to 3 smoke index values; the analyzer calculates the average value and
prints these values on the report.
Normative and laws about the air pollution, describes the procedure: DIN51402, 2116, 2117 and 2297 VDI
directives, ASTM D 2156-63 T, etc.
3.2.4 Measuring
Instruments
(optional)
1.
Smoke pump
: it should pull 1.63 liters
±
0.07 l (normalized to 0°C, 760mmHg) through a 1 cm
2
filter.
2.
Smoke index reference table
: it is a grey scale sheet with 10 different areas numbered from 0 to 9. The
number 0 corresponds to an 85%
±
2.5% reflection. Every area reflects 10% less than the previous one.
The scale is used to compare the scale with the paper filter and to calculate the smoke index.
3.
Paper filter
: When it is clean it has a reflection corresponding to the 0 scale index. It also has 3 liters per
cm
2
a minute (normalized to 0°C, 760mmHg) with a 200/800 mmwc resistance to the air flux.
