14
4.1.6 When RPM is adjusted to appropriate value, the following prompt image is
displayed:
4.1.7 After the probe is inserted into the exhaust and exhaust gas enters into optical path
of the instrument, the instrument enters into idle test.
Test lasts altogether 45 seconds, and the former 15 seconds is at preparation stage. For
the last 30 seconds the maximum value and minimum value shall be determined and
saved by the instrument, and average value shall be worked out.
4.1.8 When test time is up, the following prompt image is displayed:
Along with taking out the probe, HC concentration reduces. When HC
concentration reduces below 30% of average value or is less than 22ppmvol,
the instrument opens reversing valve automatically to accelerate the
cleaning of test optical path system. The following prompt image shows that
the instrument enters into 60-sec countdown of zeroing:
After zeroing is completed, the air pump is turned off and the instrument enters into 5-sec
cleaning (reverse blowing);
After cleaning (reverse blowing) of sampling tube is completed, valve is turned off and the
instrument returns to test menu, and average value of the test is displayed on the screen.
4.1.9 Choose
PRT
via Key-S and then press Key-E to PRT out the result of idle.
4.1.10 Choose
SAVE
via Key-S and then press Key-E to save the test data and number
Put the probe in the exhaust
keep idle
，
S :exit
Testing
，
wait
……
44
keep idle
，
S:exit
Take out the probe!
S : exit
Zeroing
……
59
S: exit
cleaning
……
59
S: exit
