Due to the chemical processes within the O2 cell it has a limited life. The
current status of the cell may be derived from its output voltage which is
monitored by the unit software. If the output voltage falls below 7.5 mV
the unit will display a warning that the cell will soon require replacement
(“Pre-warning – change O2 cell”). The unit will display an error message
that cell must be changed if the output voltage drops to 7 mV (“Change
O2 cell”). The condition of the cell may be checked at any time by using
the O2 Check/Install facility built into the software.
To check the status of the cell:
•
Select the “O2 Check/Install” option from the Gas Analyser
Maintenance Menu.
The “O2 Check/Install” screen will be displayed showing the message
“CHECKING O2 CELL – PLEASE WAIT” .
Figure 10-8 O2 Sensor Status Check
•
The unit will proceed to determine and display the cell output voltage
and will show the cell status as follows:
-
Output voltage 7.5 mV or more – “Acceptable O2 cell”.
-
Output voltage between 7.0 mV and 7.5 mV – “Pre-warning
change O2 cell”.
-
Output voltage less than 7.0 mV – “Change O2 cell”.
-
Output voltage –2.5 mV – “No O2 cell connected”.
•
Press “Exit” to return to the Gas Analyser Maintenance Menu or
“Continue” to proceed with the installation of a new cell .
60
CHECK AND/OR INSTALL THE O2 CELL
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