REV 0, June 2005 Page 201
Operation Manual SUPREMA
7. Maintenance and Service
• Events
• Configuration Changes
• Supplemental Voltage
• Processor Temperature
The History entries are shown as list view in chronological order.
Note: You can scroll vertically and horizontally through the lists by selecting the
header (with the cursor key), by pressing Enter again, and finally by using the
cursor keys (or by using the scroll bar in the PC operating program).
Calibration History
The date/time of the last four calibrations are stored here for each measure point. If there are
more than 4 entries, the oldest one is overwritten. Exception: the preliminary calibration is
always kept.
In addition, the test and zero gases used (type of gas, concentration, and unit) are also stored
as well as the associated signal voltage values (preamplified signal UA and difference voltage
Ux). On the basis of the gas concentration, it is possible to use these values to determine the
percentage by which the sensor signal has decreased.
Note: The signal voltage values (preamplified signal UA and difference voltage
Ux) and the unit are visible on the MDO module display only after scrolling with
the right cursor key.
Events History
Crossings of the alarm threshold and signal failures are stored in this history. The date/time of
the incident, the measure point involved, and a short description are given.
When an alarm limit is crossed, the alarm number (1
st
, 2
nd
, 3
rd
, 4
th
alarm) is also recorded.
The message “signal failure” is transmitted when:
• the signal is outside the measuring range;
• an interruption or short-circuit has occurred in the sensor cable;
• an MAI module is being replaced without the associated measure points having been
inhibited first; or
• an MPI or MCI module not corresponding to the type of sensor connected is being used
(see section 5.3.2 Configuration of the MAI Module)
A protocol of system incidents is also kept for service purposes. These protocols are also
used as an information source for the MSA service personnel.
Configuration Changes History
Changes of measure point parameters are stored here.
An entry includes the following data:
• date/time the configuration was accepted as valid from the Measure Point menu;
• measure point no.;
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