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Model 755A
Example:
Sample is oxygen in a background of
CO
. (Oxygen equivalent of CO
2
0.623).
Standard is the following:
Pure nitrogen for ZERO gas.
21% oxygen, 79% nitrogen for SPAN gas.
(Oxygen equivalent of nitrogen is -0.358).
With nitrogen ZERO gas flowing, Adjusted
Value is the following:
0
[100((-0.623)-(-0.358))]-100((-0.623)-(-0.358))
100
0 +
0-100(-0.265)
100
Display should be made to read 0.265%
oxygen with ZERO control.
With SPAN gas (21% oxygen, 79%
nitrogen) flowing, Adjusted Value is the
following:
21
[100((-0.623)-(-0.358))]-100((-0.623)-(-0.358))
100
21+
0-211(-26.5)-(-26.5)
21+
100
Display should be made to read 21.21%
oxygen with SPAN control.
In limiting cases the general equation
reduces to simpler forms:
1. If the SPAN gas is 100% oxygen,
there is no background gas and thus
no correction.
2. If the ZERO gas is oxygen-free, the
adjusted value for setting the ZERO
control becomes -((-0.623)-(-0.358)).
When the ZERO gas is more
diamagnetic than the background gas
in the sample, this difference is
negative. Use a recorder with below-
zero capability to set negative values.
Rosemount Analytical Inc.
A Division of Emerson Process Management
is -
2
100
= 0.265
100
-5.565+26.5
= 21 +
= 21.21%
100
GAS
Acetylene, C
H
2
2
Allene, C
H
3
4
Ammonia, NH
3
Argon, A
Bromine, Br
2
1,2-Butadiene C
4
1,3-Butadiene C
4
n-Butane, C
H
4
10
iso-Butane, C
H
4
10
Butene-1, C
H
4
8
cis Butene-2, C
H
4
iso-Butene, C
H
4
8
trans butene-2, C
=
Carbon Dioxide CO
Carbon Monoxide, CO
Ethane, C
H
2
6
Ethylene, C
H
2
4
Helium, H
e
n-Heptane, C
H
7
16
n-Hexane, C
H
6
12
cyclo-Hexane, C
6
Hydrogen, H
2
Hydrogen Bromide, Hbr
Hydrogen Chloride, HC1
=
Hydrogen Fluoride, HF
Hydrogen Iodide, HI
Hydrogen Sulphide, C
Kryton, Kr
Methane, CH
4
Neon, Ne
Nitric Oxide, NO
Nitrogen, N
2
Nitrogen Dioxide, NO
n-Octane, C
H
8
18
Oxygen, O
2
n-Pentane, C
H
5
12
iso-Pentane, C
H
5
neo-Pentane, C
H
5
Propane, C
H
3
8
Propylene, C
H
3
6
Water, H
O
2
Xenon, Xe
Table 3-3.Oxygen Equivalents of Common Gases
Instruction Manual
245364-V
May 2002
EQUIV. % AS O
-0.612
-0.744
-0.479
-0.569
-1.83
H
-1.047
6
H
-1.944
6
-1.481
-1.485
-1.205
-1.252
8
-1.201
H
-1.274
4
8
-0.623
2
-0.354
-0.789
-0.553
-0.059
-2.508
-2.175
H
-1.915
12
-0.117
-0.968
-0.651
-0.253
-1.403
S
-0.751
2
-0.853
-0.512
-0.205
+44.2
-0.358
+28.7
2
-2.840
+100.0
-1.810
-1.853
12
-1.853
12
-1.135
-0.903
-0.381
-1.340
Operation
3-11
2
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