User Manual

Error Codes

 t01 Sensor is missing

 t02 Temperature compensation failed

 t04 Bad EEPROM checksum

 t08 Sensor is shorted

 t10 Bad EEPROM

 t20 Bad calibration

 t40 Factory calibration was not done

 t80 ADC reading failed

 t100 Under range sensor

 t200 Sensor expired

NOTE: For trouble codes over 080 the display will alternate between t_1 and t00 for t100 and between t_2 and t00 for t200.

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.

Sensor Poisons

The gas sensor in the detector is designed with extreme sensitivity to the environment. As a result, the sensing function may be

deteriorated if it is exposed to contaminants, a direct spray from aerosols such as paints, silicone vapors, etc., or to a high density of

corrosive gases (such as hydrogen sulfide, sulfur dioxide) for an extended period of time.

MAINTENANCE

The CM-12 does not require regular maintenance. The unit uses a long life electrochemical sensor that has a 7 year life expectancy (in

normal conditions). 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.

End-of-life Signal

The CM-12 has a long life, non-replaceable electrochemical sensor. Seven (7) years after the CM-12 is installed the sensor end-of-life

signal will be activated indicating that the CM-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

expected life. The silence function will continue to be available for 29 days after the CM-12 initiates the initial end-of-life signal. After this

29 day period the CM-12 can no longer be silenced and the sensor must be calibrated and the sensor life reset or the CM-12 detector

replaced.