The  RAEGuard  3  detector  adopts  a  2-point  calibration  method,  i.e.  zeroing 
calibration and span calibration. The calibration of the detector should follow the 
sequence below. 
 
Note: The zero of the oxygen sensor does not need to be calibrated, nor does it 
require bump test. Clean air in the environment (20.9% vol oxygen) can be used 
to directly do span calibration. 
 
Zero Calibration 
1.  Remove the Waterproof Cap and fit the RAEGuard 3 Calibration Cap. 
 
 
2.  Put the magnet over the switch “√” for at least 3s. 
 
 
3.  Click the left switch” ▲” to increment or decrement the values, use the right 
switch” ▼” to move to the next character. The basic password is: 1111, the 
advanced password is: 8888, select the switch” √” for confirmation. 
 
 
 
4.  Select the switch” √” to enter the "Calibration & Test" menu as shown below.