How do I zero the sensor on my GD-6 Combustible Gas Detector?

The Macurco GD-6 Combustible Gas Detector can be "zeroed" to calibrate the device after it's been installed.

Follow the steps below to zero the device's sensor.
1. Take the cover off the front of the GD-6 by removing the screw with a Phillips-head screwdriver.
2. Press the "Next" button four times to access Calibration Mode (CAL).
3. Press Enter to display (100).
4. Press Enter again and the display will alternate between "0" and "000". The calibration process has begun, and should take no more than 165 seconds to complete.
5. A "PAS" message will blink if calibration is successful. Press Enter, then Next until the word "End" appears. Press Enter to return to Normal Mode.
6. A "Fail" message means the calibration failed. If this happens, repeat the calibration test. If it fails a second time, call 1-800-237-9049 for technical assistance.

Similar Products:
CM-6 Carbon Monoxide Detector
GD-2A Combustible Fixed Gas Detector