ENGINE DIAGNOSTIC TEST PROCEDURES
Section 6
•
MEASURE SMOKE INTENSITY (Continued)
International®
Smoke Nomograph for Service
For those service technicians utilizing other smoke
testing methods, the International Harvester Company
Smoke Nomograph (Chart D) is used to convert the
Bosch No. (used by IH) to four other common smoke
scales.
The five diesel smoke testing methods and scales are:
1.
The Robert Bosch Smoke Number:
This number is determined by drawing .3 litre of smoke
into a cylinder. The smoke is drawn at a uniform rate
through a filter paper. The darkness of the paper
determines the Robert Bosch number. No adjustment is
necessary for stack size.
2.
The USPHS Number (United States Public Health
Service):
This number is determined by installing a device at the
end of the exhaust stack. As smoke passes through
device, percent opacity is measured. The percent
opacity will vary depending on stack size.
3.
Celeso Model 101:
This number is determined similar to the USPHS
number. It will also vary depending on the size of the
stack.
4.
Hartridge Smoke Number:
This number is determined by drawing a measured
amount of smoke into a cylinder. A light passing through
smoke measures opacity of sample. No adjustment is
necessary for stack size.
5.
The Ringleman Rating:
These are derived by viewing smoke from the stack and
comparing it to a standard. Naturally, these values will
vary depending upon the observer, background and point
of observation.
CGES-240-4
Printed in United States of America
Page 42
