18
4.4.3After zeroing completes, 30 seconds countdown for HC remained check test will
automatically start and the screen will show:
4.4.4 HC remained passes test and the screen will show:
4.4.5 The engine preheats for 30 seconds at 70% of rated speed and then adjust speed to
idle. Pres E and the screen will show:
4.4.6 After probe injected, the exhaust gas gets into optical path of instrument and when
instrument shifts to test state, the screen will show:
4.4.7 The screen shows as following when the test time ends:
4.4.8 When HC concentration is under 30%of the average value or less than 22ppmvol,
turn on the valve, and clean optical path at an accelerated speed for 60 seconds and the
screen will show:
When 60 seconds countdown ends, close air pump, carry on 5-second cleaning (reverse
blowing), shut off valve and automatically return to test menu.
4.4.9 As for PRTing output, please refer to process in 4.1.9
4.4.10 As for saving, please refer to process in 4.1.10
4.4.11 As for inspecting maximum and minimum value, please refer to process in 4.1.11.
4.5. Double idle(without tachometer, and when RPM is 0 on screen)
As said above in section 3.8 and 3.5, input number plate of the vehicle to be test and
HC remained check
，
wait
……
29
S : exit
After preheat
，
restard to idle
E : continue S : exit
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
