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8 Service and Maintenance
8.1.2 Checking by Counter Measurement
Precise checking of the measurements is only possible through counter measurement with a
second probe, or by comparing the measured values after probe replacement.
NOTICE
During counter measurement, check whether the instrument being used measures wet or dry.
Those with an advance gas cooler are always used for dry measurement. This also applies to
instruments that extract moisture via a chemical compound. The LS2 Lambda Probe meas-
ures wet. The difference between wet and dry measurements can be obtained from the dia-
gram in the Appendix (see chapter 11.5 Wet/Dry Measurement Deviations, Conversion Table).
• If large deviations are present, it is possible to compensate for the values obtained via
– the display and operating unit, in [cal]
NOTICE
Confirm the new calibration value with ENTER or OK during the calibration of the measure-
ment value with the display and operating unit → [cal]. If not, the menu will be quit automati-
cally after 15 sec. and the new calibration value is discarded.
• the service and diagnostic software
• as follows, using the multifunction key:
– Measure the O
2
value at the monitor output or analogue output.
– Start calibration with the multifunction key.
– LED 5 should flash rapidly (see chapter 6.1.3 Internal Display and Operating Ele-
ments).
– Press briefly: The O
2
value is changed by 0.1 %
– Press long (> 3 seconds): The direction of change is reversed.
NOTICE
Which instrument measures correctly?
Compensation should only be carried out if it was previously ascertained, e.g. by using test
gases, that the comparison instrument is measuring correctly.
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