Macurco TX-12-ND Instructions D'utilisation page 16

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 warranty expired" see the Sensor Replacement 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 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 TX-12-ND requires periodic maintenance. The unit uses an electrochemical sensor with a 2-3 year life expectancy that can be
tested, calibrated and replaced in the field. The TX-12-ND replacement sensor is available through your local representative or from
Macurco. The detector's performance should be tested regularly by using gas as detailed in the Testing and Field Calibration sections.
All other 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-Warranty Signal
Two years after the TX-12-ND is installed the sensor end-of-warranty signal will be activated indicating that the TX-12-ND sensor has
reached the end of its warranty period. The end-of-warranty signal will cause an error code t200 "Sensor warranty expired". See Error
Codes section. In addition to the end-of-warranty signal the sensor itself has a tamper proof warranty expiration sticker dated 2 years
from the unit manufacture date. See the Macurco Fixed Gas Detection Products Limited Warranty section.
The end-of-warranty signal can be silenced for 48 hours by pressing the "ENTER/TEST" button or by temporarily dropping power to the
unit. The end-of-warranty 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 2-3 year expected life. The silence function will continue to be
available for 29 days after the TX-12-ND initiates the initial end-of-warranty signal. After this 29 day period the TX-12-ND can no longer
be silenced and the sensor must be replaced or the sensor life reset.
Sensor Replacement
1. Remove power to the unit
2. Remove the Philips screw on the front of the TX-12-ND. Pull the front cover of the unit off.
3. Remove the sensor by pulling it gently from the three pronged socket.
4. Remove the Shorting Spring from the new sensor and insert the new sensor into the socket.
5. Power up the unit. The TX-12-ND steps through an internal self-test cycle for the first 1 minute that it is powered. During the self-
test cycle the unit will display the Firmware Version number, then count down from 60 to 0 and finally go into normal operation. The
indicator light (LED) will flash green during the self-test cycle. At the end of the 1 minute cycle, the unit will take its first sample of
the air and the indicator light will turn solid green.
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