Measuring precision for acetaldehyde was 0.16% R.S.D. (relative standard deviation) under the
condition of HS (25 psi)/GC (16 psi) when compared to HS (21 psi)/GC (16 psi). Configuration of two level
temperatures made all the detecting values existing between upper control limit (UCL) and lower control
LCL (limit) in comparison with one level configuration.