Maintenance; End-Of-Life Signal - Macurco CD-12 User Instructions

Error Codes

t001 - Trouble with sensor signal

t002 - Temperature compensation failed

t004 - EEPROM bad checksum

t008 - IR lamp trouble

t010 - Bad EEPROM

t020 - Bad calibration

t040 - Factory calibration failure

t080 - ADC trouble

t100 - Under range

t200 - Sensor expired

t400 - Pressure sensor trouble

t800 - PCBA not tested
If the error mode repeats frequently, check for continuous power and proper voltage. If power is not the problem and a unit has
repeating error conditions, it may need to be returned to Macurco for service, per these User Instructions.
If the error mode indicates "Sensor expired" see the Sensor Life Reset section of these User Instructions.

MAINTENANCE

The CD-12 is low maintenance. The unit uses a long life NDIR sensor that has a 10+ year life expectancy (in normal conditions). The
CD-12 uses an automated background calibration program to set the clean air level on a regular basis. The CD-12 will maintain
accuracy if it is exposed to the "clean air reference value" (this reference value is the lowest concentration to which the sensor is
exposed) at least once per week. Note: This applies when used in typical indoor ambient air with weekly unoccupied periods. All
maintenance and repair of products manufactured by Macurco are to be performed at the appropriate Macurco manufacturing facility.
Macurco does not sanction any third-party repair facilities. Note: There is no field calibration procedure for the Macurco CD-12.

End-of-life Signal

The CD-12 has a long life, non-replaceable electrochemical sensor. Ten (10) years after the CD-12 is installed the sensor end-of-life
signal will be activated indicating that the CD-12 has reached the end of its typical usable life. The end-of-life signal will cause an error
code t200 "Sensor expired". See Error Codes section. The end-of-life signal can be silenced for 48 hours by pressing the
"ENTER/TEST" button or by temporarily dropping power to the unit. The end-of-life signal provides the user an opportunity to test
and/or calibrate the sensor assuring that it is still performing within acceptable parameters though the sensor is nearing the end of its
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