Kendro HERAcell 150, Operating Instructions Manual

Page: 144 / 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 38/ 9
Weitergabe sowie Vervielfältigung dieser Unterlage, Verwertung oder Mitteilung ihres Inhalts nicht gestattet, soweit nicht ausdrücklich zugestanden. Zuwiderhandlungen ver-
pflichten zu Schadensersatz. Alle Rechte für den Fall der Patenterteilung oder Gebrauchsmustereintragung vorbehalten. © Kendro Laboratory Products GmbH, Germany

Use the "cal" key to perform the zero-point adjustment of the CO
2
metering circuit.
Run a test gas addition to check the metering and regulating functions with CO
2
.
For O
2
/N
2
units:
- Remove the CO
2
from the unit.
-
Run a test gas addition with 70% O
2
or 10% N
2
.
- Observe the CO
2
zero point.
-
If required, start the O
2
compensation (see Sec. 14.4.3).
Remove the gas from the unit and restart the unit with the -auto-start- routine.
Unit with IR measuring cell: Se Section 4.14.5.
4.12 MAIN BOARD REPLACEMENT
After completing the service tasks:
After the main board has been replaced and all functional tests and control
measurements have been performed, the unit MUST be restarted with the
auto-start routine.
The unit must be disconnected from the mains power.
Replace the PCB.
The PC bus lines can be connected to the sockets in any desired order.
After installation, switch the unit on.
Press and hold down the -cal- key.
This will reset any -cal- adjustments that may have been performed.
The unit is now operating with its original specified adjustment values.
In units equipped with copper interior fittings, set the door factor in FL 8. Refer to
Section 4.5, Control and Regulating System Configuration.
The replacement PCB is set up for units with stainless steel interior fittings. (Door
factor for copper interior fittings 2.2).
Test the unit’s control and regulating functions:
-
Allow the unit to heat up to, for example, 37.0°C.
-
Once the unit reaches the specified temperature, use the -cal- key to perform