Gastec Tubes and Sampling Pump
Short terms quick measuring detector tubes 
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Gas sampling pump kit and accessories
 
 
 
Index of target gases/substances : M
Gas or Vapour
to be Measured
Chemical Formula
Gastec Tube
No. & Name
Measuring
Range
(ppm)
No.of
Pump
Strokes
Shelf
Life
(year)
Note TLV-
TWA,C
(ACGIH)
(ppm)
Maleic anhydride
C4H2O3
81 Acetic acid 0.8-20 1 3 H 0.25
Mercaptans
RSH
70 Mercaptans 5-120 1 3 T -
0.5-5 2-10
70L Mercaptans 4-8 1/2 2 -
0.5-4 1
0.2-0.5 2
0.1-0.2 4
2-Mercaptoethanol
HSCH2CH2OH
75L tert-Butyl mercaptan 0.5-7.5 1 2* T -
Mercury vapour
Hg
40 Mercury vapour 6-13.2mg/m3 1/2 3 - 0.025
mg/m3
0.25-6mg/m3 1
0.05-0.25
mg/m3
5
Mesityl oxide
(CH3)2C:CHCOCH3
141L Ethyl acetate 33.8-1080 2 2 T 15
Methacrylic acid
CH2:C(CH3)COOH
81 Acetic acid 1.8-45 1 3 H 20
81L Acetic acid 0.35-14 1 2* T
Methacrylonitrile
CH2:C(CH3)CN
192 Methacrylonitrile 10-32 1 3 + -
0.5-10 2
0.2-0.5 4
Methaldehyde
(CH3CHO)n
91L Formaldehyde 0.065-3.25 3 3* T -
Methanethiol See Methyl mercaptan below
Methanol
CH3OH
111 Methanol 1.5-4.5% 1/2 3 T 200
0.02-1.5% 1
0.004-0.02% 2
0.002-0.004% 4
111L Methanol 40-1000 1 3 T
20-40 2
111LL Methanol 20-56 2 2 T
2-20 4
2-Methoxyethyl acetate
CH3CO2CH2CH2OCH3
113L Isopropyl alcohol 50-700 2 3 T 5
1-Methoxy-2-propanol
CH3OCH2CH(OH)CH3
113L Isopropyl alcohol 50-800 4 3 T -
Methyl alcohol See Methanol below
Methyl acrylate
CH2:CHCO2CH3
141L Ethyl acetate 20-400 2 2 T 2
2-Methyl allylchloride
CH3CH2:CHCH2Cl
131La Vinyl chloride 2.8-55 1 2* + -
Methyl amine
CH3NH2
180 Amines 5-100 1 3 T 5
180L Amines 0.5-10 1 2 T
N-Methyl aniline
C6H5NHCH3
181 Aniline 3.5-42 2 3 - 0.5
Methyl bromide
CH3Br
136H Methyl bromide 300-600 1/2 3 + 1
20-300 1
10-20 2
136L Methyl bromide 100-200 1/2 2 +
10-100 1
2.5-10 4
136LA Methyl bromide 18-36 1 2 +
1-18 2
136LL Methyl bromide 1.2-3.0 1 2 +T
0.1-1.2 2
2-Methyl-3-butenenitrile
(CH3)2CHCH:CHCN
191L Acrylonitrile 0.4-12 2 3 - -
Methyl chloride
CH3Cl
51 Fluorochlorocarbons
(Pyrotectube)
12-480 1 3 + 50
51L Fluorochlorocarbons
(Pyrotectube)
32-86 1 3 +
1.6-32 2
Methyl chloroform:
(1,1,1-Trichloroethane)
CH3CCl3
135 1,1,1-Trichloroethane
(Methyl chloroform)
500-2000 1/2 3 +T 350
100-500 1
135L 1,1,1-Trichloroethane
(Methyl chloroform)
200-900 1/2 2 +T
20-200 1
6-20 2
171 Acetylene 0.06-1.2% 1 3 T
Methyl chloroformate
ClCO2CH3
131La Vinyl chloride 58-1160 5 2* + -
Methylcyclohexane
C6H11CH3
102H n-Hexane 0.04-0.84% 1 3 - 400
Methylcyclohexanol
CH3C6H10OH
119 Methylcyclohexanol 5-100 2 2 T 50
Methylcyclohexanone
C7H12O
155 Methylcyclohexanone 50-100 2 2* T 50
2-50 3
Methylene chloride
CH2Cl2
138 Methylene chloride 50-500 1 3 +T 50
25-50 2
138L Methylene chloride 60-150 1 2 +T
10-60 2
4-10 4
51L Fluorochlorocarbons
(Pyrotectube)
1-20 2 3 +
Methylene iodide
CH2I2
121L Benzene 0.4-20 5 3 + -
Methyl ether
CH3OCH3
161 Ethylether 0.03-0.85% 1 3 T -
Mehtyl ethyl ketone
CH3COC2H5
152 Methyl ethyl ketone 0.02-0.6% 2 3 T 200
152L Methyl ethyl ketone 10-120 1 2* T
120-384 1/2
151L Acetone 21-1680 5 2* T
Methylhydrazine
H2NNHCH3
185 Hydrazine 0.6-12 5 3 H C 0.1
Methyl iodide
CH3I
230H Methyl iodide 100-6000 2 2 T 2
6000-15000 1
15000-34800 1/2
230 Methyl iodide 0.5-1 4 1* T
1-20 2
20-46 1
46-108 1/2
Methyl isobutyl ketone
(CH3)2CHCH2COCH3
153 Methyl isobutyl ketone 0.05-0.6% 2 3 T 50
153L Methyl isobutyl ketone 2.5-50 1 1 T
50-130 1/2
Methylmercaptan
CH3SH
71H Methylmercaptan 1000-2700 1/2 3 - 0.5
50-1000 1
20-50 2
71 Methylmercaptan 70-140 1/2 3 T
2.5-70 1
0.25-2.5 2-10
70 Mercaptans 3.5-84 1 3 T
0.35-3.5 2-10
70L Mercaptans 4-8 1/2 2 T
0.5-4 1
0.2-0.5 2
0.1-0.5 4
Methyl metacrylate
CH2:C(CH3)CO2CH3
149 Methyl metacrylate 200-500 1 2 T 100
10-200 2
N-Methyl morpholine
CH3N(C2H4)2O
180 Amines 5-100 1 3 T -
180L Amines 0.3-6 1 2 T
4-Methyl pyridine
C6H7N
182 Pyridine 0.38-10.5 1 3 T -
N-Methyl pyrrolidone
C5H9NO
180 Amines 50-270 1 3 T -
Monochlorobenzene:
(Chlorobenzene C6H5Cl)
126 Chlorobenzene 200-500 1/2 3 - 10
5-200 1
2-5 2
126L Chlorobenzene 10-43 1 2* -
0.5-10 3
Morpholine
NH(C2H4)O
180 Amines 9-180 1 3 T 20
180L Amines 0.5-10 1 2 T
T:Temp Correction H:Humidity Correction *:Refrigerator Store Mesh:Correction Factor/Chart
 
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