Kendro HERAcell 150, Operating Instructions Manual

Page: 148 / 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 42/ 9
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4.14.3 PERFORMING ADJUSTMENTS CO
2
METERING AND REGULATION
CIRCUIT
Performing adjustments:
The following steps can be performed for units equipped with either a thermal conduc-
tivity or an infrared detector.
In general, a comparative measurement should be made, unless the actual value is
known, e.g., CO
2
display deviation at 0.0 % CO
2
.
Adjustment routine activation: Refer to the example in the operating instructions
(Chapter 6: Switch Function, Manual Zero-point Adjustment of the CO
2
Metering Sys-
tem)
Comparative meas-
urement: CO
2
regulating circuit
Perform the comparative measurement at the user's normal CO
2
concentration, e.g.,
5.0 %. Make sure the unit has adequate time to reach equilibrium before taking a
reading:
- For test addition: No sooner than 45 min. after all regulating circuits have reached
equilibrium.
- For units at oper-
ating temp., with
gas, stable hu-
midity: The measurement can be made immediately.
Comparative measurement proce-
dure: (Portable IR meter or hand pump w. sample
tube 0..10 % CO
2
)
Extract three gas samples through the metering opening in the gas dia-
phragm/glass door.
Read and average the values, then compare with the displayed value.
Deviation:
<

0.5 % CO
2
No adjustment necessary.
>

0.5 % CO
2
Refer to Section 10.6 of the operating instruc-
tions.