Kendro HERAcell 150, Operating Instructions Manual

Page: 138 / 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 32/ 9
Weitergabe sowie Vervielfältigung dieser Unterlage, Verwertung oder Mitteilung ihres Inhalts nicht gestattet, soweit nicht ausdrücklich zugestanden. Zuwiderhandlungen ver-
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4.7.8 O
2
METERING AND REGULATION CIRCUIT
Short description:
Zink oxide sensor located in the sample chamber and with replaceable, plugged-in
sensor head.
auto–cal routine for automatic adjustment is integrated into the auto-start routine.
µP-based O
2
regulator.
O
2
or N
2
input via the same connection spout.
After entering the sample chamber, the gas is dispersed across the surface of the
water to increase the rate of humidity regeneration.
The O
2
or N
2
gas input is metered by a valve. The gas flowrate is also restricted by
a capillary opening in the connection spout.
Prior to entering the unit, the O
2
or N
2
passes through a sterile filter.
The O
2
metering and regulation circuit can be manually switched off by adjusting
the set value to < 5 % (for the O
2
range of 5 ... 90 %) or adjusting the set value >21
% (for the O
2
range of 1 ... 21 %).
The initial startup ‘‘run‘‘ phase of the O
2
sensor is approx. 5 min. During this time,
CO
2
gas addition is suppressed.
Circuit diagram:
See circuit diagrams in Chapter 3.
Technical specifications:
Gas flowrate: O
2
~ 11 l/min
N
2
~ 13 l/min
Gas input pressure: 1 bar