Instruction Manual MM850402 ed. 08b
22
4.2.3
Smoke Index Measurement (option)
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 in the instrument up to 3 smoke index values; the analyzer calculates the average value and can print
these values on the report.
Normative and laws about the air pollution, describe the procedure: DIN51402, 2116, 2117 and 2297 VDI directives,
ASTM D 2156-63 T, etc.
4.2.3.1 Measuring
Instruments (option)
1.
Smoke pump
: it should suck 5.75 litres
±
0.25 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 a 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 litres per cm
2
a
minute (normalized to 0°C, 760mmHg) with a 200/800 mmwc resistance to the air flux.
