MSA SUPREMA - Page 191

REV 0, June 2005 Page 191
Operation Manual SUPREMA
7. Maintenance and Service
• Enter 100 % of the measuring range in the field “Test Gas” as the test gas concentration.
• Begin the calibration with the “Start” control field (select the control field, press Enter).
• After actuating the “Start” field, you will be asked for the password at the first measure
point. Enter the password or actuate the key switch.
• The “End Calibration” submenu will appear.
• The current measurement value UA of the measure point to be calibrated will appear in
the “Sig:” field. For an input current of 4 mA, a value of 400 mV ± 10 mV should be
displayed here. In the field “Ux=” no value or ***** is displayed.
• If the value UA is within the tolerance range (400 mV ± 10 mV), confirm by actuating the
control field “[Store]”. The value will be appear in the field “CAL-ZERO / mV”.
• Set the output current of the power source to 20 mA.
• The current measurement value UA of the measure point to be calibrated will appear in
the “Sig:” field. For an input current of 4 mA, a value of 2,000 mV ± 10 mV should appear
here.
• If the value UA is within the tolerance range (2.000 mV ± 10 mV), confirm by actuating the
control field “[Store]”. The value will appear in the field “CAL- ZERO/ mV”.
• End the calibration of the selected measure point by actuating the control field “[End]”.
• A dialog box appears: “Preliminary calibrations? NO=<ESC> YES=<ENTER>”. Termin-
ate the calibration by actuating the “ESC” key. Pressing the “Enter” key deletes the
measurement values of earlier calibrations stored in the calibration menu and in the
“Diagnosis/Logbook” menu (should be used only after replacement of a sensor).
• Set the power source back to 4 mA and lock the measure point again.
• Cut the connection between the MAT module terminal and the power source and
reconnect the sensor.
• After allowing the sensor to recover sufficiently, unlock the measure point.
• In the beginning calibration menu, select the next measure point and repeat the
procedure described above.
Calibration by Means of the Sensor
Make sure before the calibration that the sensors have recovered. This procedure can also be
used to compensate for small deviations in the output current of the sensors from the system
setup of the SUPREMA (4 mA = 0 % of the measuring range, 20 mA = 100 % of the measuring
range). The deviations in the current should not exceed ± 0.5 mA, however, or otherwise the
error evaluation (leaving the measuring range in one direction or the other) will be impaired.
Note: At least 2 people are required to perform the calibration. To avoid
communication problems between Person 1 operating the SUPREMA and Person
2 supplying the sensors with gas, we recommend the usage of a set of appropriate
two-way radios.
Again, the required zero and test gases, test adapters, and hose connections (see operating
and maintenance instructions of the sensor) for supplying the gases are a necessary precondition
for a successful calibration.
The duration and flow rate of the zero and test gas supplys can be found in the operating and
maintenance instructions for the sensor in question.