ENMET RECON-4 - Manual (Page 13)

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3.8.2 Modify Parameter of each sensor channel:
The user can modify the calibration gas concentration, low alarm level and high alarm level of each sensor
channel by checking the box of the item they want to modify and then click Setup.
3.8.2.1 Channel 1—Oxygen (O2):
The Adjusting Concentration for the Oxygen channel can only be 20.9 % by volume.
The Low alarm level for Oxygen should be between 16.0 and 19.5 % by volume.
The high alarm level for Oxygen should be between 22.4 and 24.0 % by volume.
3.8.2.2 Channel 2— Hydrogen sulfide (H2S)
The Adjusting Concentration for the H2S channel can only be between 20.0 and 80.0 ppm.
The Low alarm level for H2S should be between 5.0 and 15.0 ppm.
The high alarm level for H2S should be between 15.0 to 30.0 ppm.