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6.2.4 Zero Calibration
If zero drift of the sensor is over range, user can proceed zero calibration ,the gas concentration are defaulted set to zero after zero
calibration as shown in figures 30.
Special Note: 1.Zero calibration must be proceed in fresh air or high-purity inert gas(for example 99.999%VOL N2 etc)
2.Do not operate zero calibration for those gases which already exist in the air,such as oxygen,carbodioxide,nitrogen.
6.2.5 Target Calibration
(Do Not Calibrate Unless You Are Professional)
Find a fresh-air environment.This is an environment free of toxic or combustible gases and
a normal oxygen content(20.9%VOL)
GT--1000 series gas detector provide 6 levels target gas concentration calibration,as shown in figure 31-32,this calibration should be
