User Manual

Macurco CX-xx Manual (Rev-1.0) Eng
REV – 1.1 [34-2900-0512-0 ] 31 | Page
5.2 Sensor Poisons
The sensors in the detector are designed with extreme sensitivity to the environment. As a result, the sensing
function may be deteriorated if the detector 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.
5.3 Sensor Expired
The CX-xx has two replaceable electrochemical sensors (one CO and one NO
2
). Each sensor has an expected life of
two years. After two years, the “Sensor expired” signal will be activated indicating that one or both sensors have
reached the end of their typical usable life. The “Sensor expired” signal will cause an error code (tA00 for CO, t200
for NO
2
). See Section 5.1.2 Trouble Codes.
The “Sensor expired” signal can be silenced for 48 hours by pressing the "ENTER/TEST" button or by temporarily
dropping power to the unit. The “Sensor expired” 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 CX-xx initiates the initial “Sensor expired”
signal. After this 29-day period the CX-xx can no longer be silenced, and the sensor must be calibrated, and the
sensor life reset, or the sensor replaced.
Figure 5-3 Replacement Sensor Location