ENGINE DIAGNOSTIC TEST PROCEDURESSection 6CHART DINTERNATIONAL® SMOKE NOMOGRAPHUSE CHART D TO CONVERT FROM ONE SMOKE SCALE TO ANOTHERCG-7642*Good for given stack size only. For a different stacksize (see example) read percent, then add or subtractthe following correction factor.Percent Opacity5%10%15%20%25%Sample taken from a127 mm (5 in) stack -Subtract from reading1.02.03.04.05.0Sample taken from a76 mm (3 in) stack -Add to reading1.02.03.54.55.5Example-With a 127mm (5 in) stack, a reading of 10% isobtained using a Celeso Model 101. To correctpercent, subtract 2.0 giving a correctednumber of 8%. This would be approximately a3.2 on the Robert Bosch scale.**This value will vary depending upon observer,background and point of observation.CGES-240-4Printed in United States of AmericaPage 43
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