Siemens 7MB2335, Operating Instructions Manual, Page: 74 / 168

Operation
5-24
Operating instructions ULTRAMAT 23 gas analyzer
C79000-B5276-C216-03
5.8.4 Calibration: AUTOCAL
In this dialog you can change the following values of the AUTOCAL
parameters:
S
Thermo-AUTOCAL
OFF: An automatic AUTOCAL only takes place when the cycle time
has expired (see below).
ON: An automatic AUTOCAL is carried out when the set cycle time
has expired, and is also triggered in the case of changes in
temperature > 8
_
C.
S
Cycle time AUTOCAL
A further dialog is called, and you can set and modify the cycle time
(the time between two AUTOCAL procedures triggered by the
analyzer) in the second line. Valid cycle times are from 0 to
24 hours. In the display, 6 hours has been set as an example. A
cyclic AUTOCAL is not carried out if 0 hours is set.
The cycle time must not be set > 6 h if the analyzer is used in
German systems subject to TA Luft and 13.BlmSchV.
The fourth line indicates when the next AUTOCAL will take place.
If the flow during an automatic (cyclic) zero adjustment is too low,
this zero adjustment is aborted, and an error status set. The failed
zero adjustment is entered in the logbook.
S
Purge time
If you call the menu item ”Purge time”, you can change the purge
time (duration of flow with sample gas) in the second line of the
displayed dialog. Valid purge times for analyzers with an O
2
sensor
are 60 to 300 s, otherwise 0 to 300 s. There are minimum purge
times depending on the measured components, and shorter times
should not be used. 80 seconds has been selected in our example.
Thermo-AUTOCAL: OFF
Cycle time AUTOCAL
Purge time
584
AUTOCAL
Cycle time:
6 hours
Time left 04:44 h
5841
Purge time
_
80 seconds
5842