2) When we get the salt spray chamber been repaired, maintained, or transported.
3) When we find the test results are obviously improper.
1) Calibrate by ourselves.
The salt spray chamber manufacturers always offer calibration kits. Carry the calibration process following the instruction of manufacturer. Below data should be measured and recorded continuously for more than 16 hours.
1.2 Quantity of fog.
1.3 Solution concentration.
1.4 Solution pH value.
1.5 Solution specific gravity.
2) Calibrate by a third party laboratory.
A laboratory should have detailed and standardized procedure of carrying such calibration, and a detailed calibration certificate should be issued. An accredited laboratory is necessary.