ENGINE DIAGNOSTIC TEST PROCEDURES
Section 6
CHART D
INTERNATIONAL® SMOKE NOMOGRAPH
USE CHART D TO CONVERT FROM ONE SMOKE SCALE TO ANOTHER
CG-7642
*Good for given stack size only. For a different stack
size (see example) read percent, then add or subtract
the following correction factor.
Percent Opacity
5%
10%
15%
20%
25%
Sample taken from a
127 mm (5 in) stack -
Subtract from reading
1.0
2.0
3.0
4.0
5.0
Sample taken from a
76 mm (3 in) stack -
Add to reading
1.0
2.0
3.5
4.5
5.5
Example-With a 127mm (5 in) stack, a reading of 10% is
obtained using a Celeso Model 101. To correct
percent, subtract 2.0 giving a
corrected
number of 8%. This would be approximately a
3.2 on the Robert Bosch scale.
**This value will vary depending upon observer,
background and point of observation.
CGES-240-4
Printed in United States of America
Page 43
