Hc Residue Test - Sagem Ultima 600 Maintenance Manual

S
4.1.4 – HC residue test
Purpose:
This test checks for the absence of residual hydrocarbons which would distort the HC
measurement (and Lambda) value.
Frequency:
This test is automatically performed before each HC measurement. The test can also be
performed by manual operator selection.
Procedure:
Starting in standby mode:
• Go to the Selftest by pressing the "validation" key
• Select: "HC residue test" in the Selftest menu using the t or s keys then press
"validation".
The gas sampling sensor must be in the open air outside the exhaust pipe.
• The analyzer can perform a Calibration (duration: 60 S) before this test.
• The test is then performed automatically and lasts 20 s.
- If the value is less than 20 ppm, the unit will indicate "Good".
- If not, the unit will indicate "Bad". In this case:
. Purge the gas circuit by running the unit in vented mode.
If the message persists, replace the filters and clean the
gas sampling sensor (See paragraphs 4.1.7 and 4.1.8).
+
If the test is bad, no measurement is possible.
Another test can then be performed (validate < Repeat>), or return to standby mode
(validate <Cancel> OR PRESS KEY C).
ULTIMA 600
Take off sampling
exhaust pipe sensor,
then validate
< I >
Figure 4-2 – HC RESIDUE TEST – Display screens
Issue 05/99
←
ULTIMA 600

HC residue test

GOOD RESULT
Ref. 21821085-0/A
ULTIMA 600
HC residue test
xxxx ppm vol
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05 SEC
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4-4