M-20 Operation And Maintenance Manual
83550-003-001 Revision C
2008-01-03
8
2. Operation
When the unit is powered up, it displays a software revision string, followed by the gas
identification string as shown below:
The display shows the software revision for 3 seconds:
QEL M-20
V3.01 RA
Where “V3.01” indicates the software Version and “RA” the software Revision number.
The revision string is followed by:
CO2 ppm
----
Where “----” indicate that the first measurement is in process.
After 10 seconds, the bottom display line will show the concentration of CO
2
in ppm. The
measurement is updated every 10 seconds.
3. Fault Indication
Should an internal fault occur, the unit will display:
FAULT 0X
Where X is a fault code, ranging from 0 to 9. Please refer to the
Troubleshooting
section for a
list of fault codes.
NOTE:
Please refer to the troubleshooting section if you notice any unexpected
message indications (e.g.: Defaults Loaded). A fault code will be
displayed for 10 seconds, after which the unit will restart and attempt to
resume normal operation.