Maintenance; Sensor Poisons; End-Of-Life Signal; Sensor Life Reset - Macurco RD-12 Instructions D'utilisation

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The gas sensor in the detector is designed with extreme sensitivity to the environment. Alcohols, ammonia, cleaning solvents, paint

thinner, gasoline vapors, and aerosol propellants may cause nuisance alarms.

In addition, 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 or sulfur dioxide) for an extended period of time.

MAINTENANCE

The RD-12 is low maintenance. The unit uses a long life solid-state sensor that has a 7+ year life expectancy (in normal conditions).

The detector's performance should be tested regularly by using gas as detailed in the Gas Testing section. 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 RD-12.

The RD-12 has a long life, non-replaceable solid-state sensor. Seven (7) years after the RD-12 is installed the sensor end-of-life signal

will be activated indicating that the RD-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 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 RD-12 initiates the initial end-of-life signal. After this 29 day period the RD-12 can no

longer be silenced and the sensor life must be reset or the RD-12 detector replaced.

Remove the Philips screw on the front of the RD-12. Pull the front cover of the unit off.

To reset the sensor life (rSt), from normal or warm-up mode, press the Next button four times to get to "SEn" or Sensor Mode.

Then press the Enter button to get to "rSt" - Reset Sensor Mode.

Press the Enter button again to see the sensor reset status. If the sensor life has already been reset, done "don" will be

displayed. If it has not already been reset, "nO" will be displayed. Push Next to change it to " yES" (flashing) then push Enter to

confirm the change (solid) and push Enter again to return to "rSt" in the "SEn" menu. Push Next until "End" is displayed then

push Enter to get back to normal operation. Note: The sensor life will be reset for 1 year.

Note: If the sensor is reset and the detector not replaced, it is necessary to test the sensor to assure that it is still performin g within

acceptable specifications though the sensor is nearing the end of its expected life. There will be no other indication of sensor

performance.

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