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5 Maintenance
5.1.9.1 Offset Calibration perform to 21 % O2
Before offset calibration, check whether Rki O
2
value is equivalent to 20 ļ (see menu 211 and
213 in chapter 5.1.4 Reading the Measured Values).
Otherwise, proceed as described in chapter 5.1.7 Response of the Internal Resistance Reg-
ulation.
Fig. 5-1 Display R
ki
Also check the probe voltage U-O
2
. It must be in the range of +10 ... -20 mV.
To perform an offset calibration, the probe must be located in the ambient air and should run
for at least 30 minutes in a fault-free measuring mode.
No access level is required!
NOTICE
In case of the KS1D-HT (type 656R2015), the offset calibration can also be performed in an
installed state whilst combustion is running. For this purpose, air (dry and oil-free air, instru-
ment air or ambient air) must be fed at connection with a volume of 40 ... 60 l/h for the duration
of the calibration.
Activate MAINTENANCE!
In the MAIN MENU, select for the cali-
bration of the probe.
In PROBE CALIBRATION, select for the
offset calibration.
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