Kendro HERAcell 150, Operating Instructions Manual

Page: 150 / 251

Name/Name Datum/Date Benennung/Designation
Erstellt/Prepared
D.Dornseiff 01/15/98
Index Änderung Name/Name Datum/Date
Service Handbuch HERAcell 150
Service Manual HERAcell 150
C 202613 D.Dornseiff 06/26/03
Dokumentnr./Document No. Seite/Page
Datei/File
50051109_04_EN_C.doc 50051109 / C 44/ 9
Weitergabe sowie Vervielfältigung dieser Unterlage, Verwertung oder Mitteilung ihres Inhalts nicht gestattet, soweit nicht ausdrücklich zugestanden. Zuwiderhandlungen ver-
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4.14.4 ADJUSTMENTS - O
2
METERING AND REGULATION CIRCUIT
In general, a comparative measurement with O
2
gas addition to the recommended
values for the individual sensor should be performed.
Comparative measurement: O
2
regulation circuit
Perform the comparative measurements at the following O
2
concentrations:
Sensor measurement range 1...21% O
2
: approx. 5% O
2
Sensor measurement range 5...90% O
2
: approx. 90% O
2
Give the unit sufficient time to stabilize before reading the measured values:
- For test gas addition: No sooner than 45 min. after all regulating circuits
have reached equilibrium
- For units at operating temp.,
with gas, stable humidity: The comparative measurement can be made im-
mediately.
Performing the comparative measure-
ment: (O
2
reference measuring instrument)
Extract three gas samples through the metering opening in the gas diaphragm/glass
door.
Read and average the values, then compare with the displayed value.
Sensor measurement range 1...21% O
2
Deviation: < ± 0.5 % O
2
No adjustment necessary.
> ± 0.5 % O
2
Perform the adjustment (see below)
Sensor measurement range 5...90% O
2
Deviation: < ± 2 % O
2
No adjustment necessary.
> ± 2 % O
2
Perform the adjustment (see below)
O
2
adjustment procedure:
Press and hold down the -cal- , -i- , and -O
2
- keys simultaneously until the O
2
dis-
play flashes.
Set the reference measured value.
Press any key to return to the normal operating mode.