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Instruction Manual
760007-A
July 2003
3-10 Operation Rosemount Analytical Inc. A Division of Emerson Process Management
Model NGA2000 PMD
In two limiting cases, the general equation is reduced to simpler forms.
1. If the span standard gas is 100% oxygen, the adjusted oxygen value is the same as the true value (i.e.,
100% O
2
).
2. If the zero standard is an oxygen-free zero gas, the adjusted value for setting the ZERO Control =
BGGst-BGGs. (If the oxygen-free zero gas is more diamagnetic than the background gas in the sam-
ple, this difference is negative. The negative value may be entered in the Calibration Gas List.)
Alternately, the user can avoid these compensation calculations by using zero and span gases which have
been specially prepared to contain the expected amounts of background gas. Calibration of the analyzer
module will then factor in background gas effects in the same proportions as normal run mode measure-
ment.
GAS EQUIV. % AS O
2
GAS EQUIV. % AS O
2
Acetylene, C
2
H
2
-0.612 Hydrogen Bromide, Hbr -0.968
Allene, C
3
H
4
-0.744 Hydrogen Chloride, HC1 -0.650
Ammonia, NH
3
-0.479 Hydrogen Fluoride, HF -0.253
Argon, A -0.569 Hydrogen Iodide, HI -1.403
Bromine, Br2 -0.83 Hydrogen Sulhide, H
2
S -0.751
1,2-Butadiene, C
4
H
6
-1.047 Krypton, Kr -0.853
1,3-Butadiene, C
4
H
6
-0.944 Methane, CH
4
-0.512
n-Butane, C
4
H
10
-1.481 Neon, Ne -0.205
iso-Butane, C
4
H
10
-1.485 Nitric Oxide, NO +44.2
Butene-1, C
4
H
8
-1.205 Nitrogen, N
2
-0.358
cis Butene-2, C
4
H
8
-1.201 Nitrogen Dioxide, NO
2
+28.7
iso-Butene, C
4
H
8
-1.274 Nitrous Oxide, N
2
O -0.560
trans Butene-2, C
4
H
8
-1.274 n-Octane, C
8
H
18
-2.840
Carbon Dioxide, CO
2
-0.623 Oxygen, O
2
+100.0
Carbon Monoxide, CO -0.354 n-Pentane, C
5
H
12
-1.810
Ethane, C
2
H
6
-0.789 iso-Pentane, C
5
H
12
-1.853
Ethylene, C
2
H
4
-0.553 neo-Pentane, C
5
H
12
-1.853
Helium, He -0.059 Propane, C
3
H
8
-1.135
n-Heptane, C
7
H
16
-2.508 Propylene, C
3
H
6
-0.903
n-Hexane, C
6
H
14
-2.175 Water, H
2
O -0.381
cyclo-Hexane, C
6
H
12
-1.915 Xenon, Xe -0.340
Hydrogen, H
2
-0.117
Table 3-4. Oxygen Equivalents of Common Gases