Shenzhen Korno Import&Export Co.,Ltd
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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
figure 26.
Special Note: Zero calibration must be proceed in fresh air or high-purity
inert gas(for example 99.999%VOL N2 etc)
6.2.5 Target Calibration
(Do Not Calibrate Unless You Are
Professional)
GT-903 series gas detector provide 6 levels target gas concentration
calibration,as shown in figure 27-28,this calibration should be operate under
conditions of certain standard concentration gas, Pressure reduction valve ,Flow
meter, Calibration cover and make sure all instruments are well connected,
otherwise this function is forbidden.
Procedures: Connect all instruments as shown in figure 29,enter target gas
calibration interface,release standard gas slowly and control gas flow within
500ml/min,observe the real-time concentration value(concentration value should
be increasing),wait until real-time concentration value rise to the peak reading and
