Siemens ULTRAMAT 23, Manual, Page: 177 / 244

ULTRAMAT 23
Manual, 3/2016, A5E37100388-003
177
Error and system messages
11
The analyzer can detect and display various fault statuses. These fault statuses are divided
into maintenance requests and faults.
11.1 Maintenance requests
Maintenance requests are references to certain changes in the analyzer which - at the time
of occurrence - have no influence on the analyzer measurements. However, remedial
measures are recommended to guarantee that measurements remain possible.
If the analyzer is in measuring mode, you can recognize the occurrence of a maintenance
request in that an "M" appears at the right edge of the measurement screen.
Maintenance requests are logged and can be called in input mode
using the menu path "Analyzer status - Status - Maintenance re-
quests" (see section Analyzer status: Status: Maintenance request
(Page 105)). The corresponding message texts are stored. You can
delete the messages by pressing the <ENTER> key. However, they
appear again if the cause has not been eliminated.
The analyzer outputs a maintenance request in the following cases:
● Message "AUTOCAL drift beyond tolerance"
The zero drift of a component is too large during the AUTOCAL procedure. The
AUTOCAL parameters can be entered as described in section Calibration:
AUTOCAL/drift values (Page 122). Using the conditions defined for the AUTOCAL
deviation (see section Configuration: Special functions: AUTOCAL deviation (Page 144)),
the actual deviation may deviate from the maximum permissible value. In such cases it
may be meaningful to set a shorter interval between two AUTOCAL procedures. If this
does not improve the situation, contact the servicing department.
● Message "O2 sensor"
The measured voltage of the O
2
sensor has dropped as a result of aging, but is still within
the permissible range. This means that it is not necessary to replace the O
2
sensor
immediately, but this will soon be exhausted. This would be the correct time to order a
new O
2
sensor.
● Message "Temperature beyond tolerance"
The contrast control is no longer guaranteed if the LCD temperature is outside the
permissible tolerance. It may then be difficult to read the display, or it could remain dark
in the worst case. If this fault occurs because of an excessively high ambient
temperature, provide sufficient ventilation or air conditioning. If the fault still occurs,
contact the servicing department.
● Message "H
2
S sensor status"
If this message occurs, the measuring reserve of the H
2
S sensor is almost used up. We
recommend that you then replace the sensor. If the measuring reserve of the H
2
S sensor