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Appendix C: Gas Select Mode
GX-3R Pro Operator’s Manual
Gas
Standard
(ppm)
IEC (ppm)
ISO (ppm)
Methane (CH4)
50,000
44,000
44,000
Isobutane (i-C4H10)
18,000
13,000
15,000
Hydrogen (H2)
40,000
40,000
40,000
Methanol (CH3OH)
55,000
60,000
60,000
Acetylene (C2H2)
15,000
23,000
23,000
Ethylene (C2H4)
27,000
23,000
24,000
Ethane (C2H6)
30,000
24,000
24,000
Ethanol (C2H5OH)
33,000
31,000
31,000
Propylene (C3H6)
20,000
20,000
18,000
Acetone (C3H6O)
21,500
25,000
25,000
Propane (C3H8)
20,000
17,000
17,000
Butadiene (C4H6)
11,000
14,000
14,000
Cyclopentane (C5H10)
14,000
14,000
14,000*
Benzene (C6H6)
12,000
12,000
12,000
N-hexane (n-C6H14)
12,000
10,000
10,000
Toluene (C7H8)
12,000
10,000
10,000
N-heptane (n-C7H16)
11,000
8,500
8,000
Xylene (C8H10)
10,000
10,000
10,000*
N-nonane (n-C9H20)
7,000
7,000
7,000
Ethyl acetate (EtAc)
21,000
20,000
20,000
Isopropyl alcohol (IPA)
20,000
20,000
20,000*
Methyl ethyl ketone (MEK)
18,000
15,000
15,000
Methyl methacrylate (MMA)
17,000
17,000
17,000*
Dimethyl ether (DME)
30,000
27,000
27,000
Methyl isobutyl ketone (MIBK)
12,000
12,000
12,000*
Tetrahydrofuran (THK)
20,000
15,000
15,000*
* Values are actually IEC because no ISO definition exists for these gases.