AUTOplus manual
Page 41
COK :
Generally known as corrected CO. This value is calculated and
used for comparison with the actual infrared measured CO value.
COK = (COx15)/(CO + CO2), for normal car exhaust CO + CO2 =
about 15%. In this case CO is approximately equal to COK. If
COK is clearly higher than CO this indicates defects such as
exhaust leaks. At near zero COK is not valid.
LAMBDA (
λ
):
The value of Lambda gives an indication of the burning
fficiency of
t
he engine. This can be replaced with the Air Fuel
Ratio (AFR) below. See section 5.2.3.to change between displays.
Appendix B gives the formula used.
When sampling fresh air and lambda is outside operation range
this indication will show ‘-----‘.
AFR :
Air Fuel Ratio is another method for displaying the efficiency of an
engine. The calculation for the AFR is Lambda multiplied by 14.7
for Petrol and 15.6 for LPG (typically). When sampling fresh air
this indication will show ‘-----‘.
NO :
Nitric oxide reading in ppm (parts per millions) of the exhaust gas.
Displayed when Nitric oxide sensor fitted, indicated on the rear
label. Displays NOT FITTED or N/F when sensor not fitted and
FAULT or FLT if failed.
NOx :
A calculated value based on the measured level of Nitric Oxide to
display total oxides of Nitrogen. NOx = NO X 1.05
TIME TO:
The analyzer requires to regularly zero the sensors. Once a
ZERO
has been performed the time to the next zero is displayed in
minutes. Check there is sufficient time remaining before starting
a test and perform a manual zero if not.
