14
BA315001-en
Display: Menu > Servicing menu > Leaktightness test
6.3
Zero Adjustment
The MET checks whether zero-balance adjustment is necessary before each
measurement. If the last zero-balance adjustment was performed more than 8
minutes ago, an adjustment is automatically performed before the measurement.
This involves ambient air being induced through combined particle and activated
carbon filter F2. The measurement values are adjusted as follows:
O
2
20,9 % vol
MET 6.1 / 6.3
CO, CO
2
0 % vol
HC to
0 ppm
Opacity, LED on:
0 %
MET 6.2 / 6.3
Opacity, LED off:
100 %
The zero-balance adjustment can be triggered manually as required.
MES: Otto or diesel > Unit diagnosis > Measurement overview or calibration
overview > Zero-balance adjustment)
Display: Menu > Servicing menu > Zero-balance adjustment
6.4
Residue Hydrocarbon (HC) Test (MET 6.1 / 6.3)
An HC residue test needs to be performed every day. If a measurement is started
before an HC residue test has been performed, the unit automatically performs an
HC residue test before the measurement is taken. This involves inducing ambient
air via the sampling probe and checking that the HC value is below 20 ppm.
Ensure that the probe intakes air with no HC residue. (Remove the probe from the
exhaust.)
The HC residue test can be triggered manually as required.
MES: Otto or diesel > Device diagnosis > Calibration overview > HC test
Display: Menu > Servicing menu > HC test
