Tube No.
Gas or Vapour to be Measured
Sampling time
for 1 pump
stroke
（
100mL
）
Sampling time for a
half pump stroke
（
50mL
）
Correction factor
70L
Mercaptans
2min.
1min.
NONE
70LN
Mercaptans
1.5min.
NONE
72
Ethyl mercaptan
2min.
1.00
72LN
Ethyl mercaptan
1.5min.
NONE
75N
tert-Butyl mercaptan
1.5min.
NONE
75LN
tert-Butyl mercaptan
1.5min.
1.12
81L
Acetic acid
2min.
1min.
1.19
91L
Formaldehyde
2min.
1.16
92M
Acetaldehyde
1min.
1.11
100A
LPG
2min.
NONE
101L
Gasoline
2min.
1.25
102L
Hexane
1.5min.
1.16
103
Hydrocarbons (Lower class)
3min.
1.5min.
NONE
105
Hydrocarbons(Higher class)
2min.
1min.
NONE
106
Petroleum naphtha
1min.
30sec.
NONE
111
Methanol
1min.
30sec.
1.40
111L
Methanol
3min.
1.25
112
Ethanol
1.5min.
45sec.
1.35
112L
Ethanol
3min.
1.21
117
Isoamyl alcohol
2min.
1.21
118
Cyclohexanol
2min.
1.35
120
Aromatic hydrocarbons
1.5min.
45sec.
1.35
121
Benzene
1.5min.
1.22
121S
Benzene
2min.
1.53
121SL
Benzene
2min.
1.30
121L
Benzene
3min.
1.19
122
Toluene
2min.
1min.
1.35
122L
Toluene
1.5min.
1.22
123
Xylene
2min.
1min.
1.33
123L
Xylene
1.5min.
1.47
124
Styrene
1min.
30sec.
1.48
124L
Styrene
1min.
30sec.
1.46
131
Vinyl chloride
2min.
1min.
1.17
131L
Vinyl chloride
1.5min.
1.25
131La
Vinyl chloride
2min.
1min.
NONE
131La
1,3-Dichloropropene
2min.
1min.
1.17
131LB
Vinyl chloride
1.5min.
1.29
132LL
Dichlorvos
1.5min.
45sec.
1.14
134
Chloropicrin
1.5min.
1.28
134L
Chloropicrin
2min.
1.28
135
1,1,1-Trichloroethane
3min.
1.5min.
NONE
136H
Methyl bromide
2min.
1min.
NONE
136L
Methyl bromide
2min.
1min.
NONE
136LA
Methyl bromide
1.5min.
45sec.
1.15
136LL
Methyl bromide
3min.
NONE
139
1,2-Dichloroethylene
1min.
30sec.
NONE
141L
Ethyl acetate
2min.
NONE
141L
Methyl
isothiocyanate
Shelf life
before Sep.2021
2min.
1.28
Shelf life
Sep.2021 or after
2min.
1.36
