User Manual

15
The GD-12 has a long life, non-replaceable catalytic bead sensor. Five (5) years after the GD-12 is installed the sensor end-of-life
signal will be activated indicating that the GD-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 GD-12 initiates the initial end-of-life signal. After this
29 day period the GD-12 can no longer be silenced and the sensor must be calibrated and the sensor life reset or the GD-12 detector
replaced.
Sensor Life Reset
1. Remove the Philips screw on the front of the GD-12. Pull the front cover of the unit off.
2. To reset the sensor life (rSt), from normal or warm-up mode, press the Next button five times to get to SEn or Sensor Mode.
3. Then press the Enter button to get to “rSt” - Reset Sensor Mode.
4. 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. 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 and/or calibrate the sensor to assure that it is still
performing within acceptable specifications though the sensor is nearing the end of its expected life. There will be no other indication of
sensor performance.
Do not disassemble unit or attempt to repair or modify any component of this instrument. This instrument contains no user serviceable
parts, and substitution of components may impair intrinsic safety, which may adversely affect product performance and result in
sickness or death.
CAUTION
Avoid the use of harsh cleaning materials, abrasives and other organic solvents. Such materials may permanently scratch the surfaces
and damage the display window, labels, sensor or instrument housing.
Cleaning
Cleaning of the external surfaces is best carried out using a damp cloth with a mild detergent or soap. Use a vacuum cleaner with soft
brush to remove dust or contamination under the cover. Do not blow out the sensor with compressed air.
TESTING
Using a certified gas with a concentration other than the one listed for this detector when conducting a calibration or calibration
verification test (bump test) will produce inaccurate readings. This means that higher levels of the gas being monitored may be present
and could result in overexposure and cause sickness or death. For proper use, see supervisor or User Instructions, or call Technical
Service at 1-877-367-7891
! WARNING
! WARNING