YOKOGAWA DTSXL, User Manual, Page: 52 / 289

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A-29
IM 39J06B40-01EN 14th Edition: May 30, 2022
Table Corrosive-gas Environment Classification
Severity
Level
G1
Mild
G2
Moderate
G3
Harsh
GX
Severe
Copper corrosion level
＜
300
(
＜
0.03)
＜
1000
(
＜
0.1)
＜
2000
(
＜
0.2)
≥ 2000
( ≥ 0.2)
[Å]
([μ m])
Group A H
2
S
＜
3
＜
10
＜
50 ≥ 50
SO
2
, SO
3
＜
10
＜
100
＜
300 ≥ 300
Cl
2
＜
1
＜
2
＜
10 ≥ 10
NOx
＜
50
＜
125
＜
1250 ≥ 1250 [mm 3 /m 3 ]
Group B HF
＜
1
＜
2
＜
10 ≥ 10
NH
3
＜
500
＜
10000
＜
25000 ≥ 25000
O
3
＜
2
＜
25
＜
100 ≥ 100
TIP
- The gas density data indicated in the table are for reference only, with the relative humidity of 50 %
RH or less. The category goes up one rank higher every time the humidity increases 10 %
exceeding the 50 % RH or over 6 % per hour.
- The Group-A gases shown in the table may coexist and cause inter-reaction.
- Inter-reaction factors are not known for the Group-B gases.