About this task
Ensure the sensor is in clean air and follow these steps:
Figure 1. CO zero calibration
Procedure
- Press and hold the UP key for 3 s to initiate the calibration process.
- When the calibration completes, the display shows DONE.
- Press MENU to advance to the next selection. A CO Zero Calibration Counter increments every time you perform this step and the CO Re-Cal timer is reset whenever you perform this step.
- Attach the 250 ppm CO gas bottle to the regulator and firmly tighten the regulator by hand.
- Moisten the sponge and squeeze out any excess water.
- Place the sponge in the cap so that the sponge does not plug the hole in the side of the cap.
- Install the cap over the CO pod to be calibrated.
- Turn on the regulator to begin gas application. Wait 3 to 5 mins for the sensor to stabilize, then press and hold the UP key for 3 s to initiate the calibration process.
- When the calibration completes, the display shows DONE.
-
Press MENU to advance to the next selection. A CO 250
Calibration Counter increments every time you perform this step and the CO Re-Cal
timer resets whenever you perform this step.
Note: If the reading is not within +10% or -10% of the expected value, the unit does not calibrate and reports a failure.