Siemens ULTRAMAT 23, Manual, Page: 159 / 244

Functions
8.5 Automatically executed functions
ULTRAMAT 23
Manual, 3/2016, A5E37100388-003
159
Return to measuring mode
An active purging function can be exited or interrupted if:
● The H
2
S measured value remains permanently below the threshold for the permissible
continuous concentration during the pre-purging phase
● The probe protection function is triggered
● A different device status is started such as calibration, AUTOCAL, etc.
Sequence parameter
The zero gas purge time is twice the AUTOCAL purge time. The pre-purging phase is equal
to the AUTOCAL purge time. The AUTOCAL purge time is an adjustable parameter whose
setting is described in section Calibration: AUTOCAL/drift values: Purge time (Page 123).
The device remains in measuring mode while the protection function is running. You can
read out via ELAN or PROFIBUS whether the protection function of the analyzer is being
processed, and in which step.
The following illustration shows how the purging function runs over time:
Figure 8-5 The H
2
S purging function over time