Rosemount 755, Инструкция по эксплуатации

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S
TARTUP
3-7
748183-H
Rosemount Analytical
November 1997
3.3.1 O
XYGEN
E
QUIVALENT
V
ALUES OF
G
ASES
For computation of background
corrections, the analyzer response to
each component of the sample must be
known. Table 3-3 lists the percentage
oxygen equivalent values for many
common gases. The percentage oxygen
equivalent (POE) of a gas in the
instrument response to the given gas
compared to the response to oxygen,
assuming that both gases are supplied at
the same pressure, can be calculated
using the following equation:
To select a random example from Table
3-4, if analyzer response to oxygen is
+100%, the response to xenon would be
-1.34%.
O
XYGEN
E
QUIVALENTS OF
G
AS
M
IXTURES
The oxygen equivalent of a gas mixture is
the sum of the contributions of the
individual gas components.
EXAMPLE: ZERO-BASED RANGE
At lower range-limit, i.e., 0% oxygen
composition of sample is: 80% CO
2
,
20% N
2.
From Table 3-4, the % oxygen
equivalents are: CO
2
, -0.623%, N
2
, -
0.358%.
% oxygen equivalent of mixture
= 0.8 x (-0.623) + 0.2 x (-0.358)
= (-0.4984) + (-0.07l6)
= 0.570% O
2
GAS
EQUIV. % AS
Acetylene, C
2
H
2
-0.612
Allene, C
3
H
4
-0.744
Ammonia, NH
3
-0.479
Argon, A -0.569
Bromine, Br
2
-1.83
1,2-Butadiene C
4
H
6
-1.047
1,3-Butadiene C
4
H
6
-1.944
n-Butane, C
4
H
10
-1.481
iso-Butane, C
4
H
10
-1.485
Butene-1, C
4
H
8
-1.205
cis Butene-2, C
4
H
8
-1.252
iso-Butene, C
4
H
8
-1.201
trans butene-2, C
4
H
8
-1.274
Carbon Dioxide CO
2
-0.623
Carbon Monoxide, CO -0.354
Ethane, C
2
H
6
-0.789
Ethylene, C
2
H
4
-0.553
Helium, H
e
-0.059
n-Heptane, C
7
H
16
-2.508
n-Hexane, C
6
H
12
-2.175
cyclo-Hexane, C
6
H
12
-1.915
Hydrogen, H
2
-0.117
Hydrogen Bromide, Hbr -0.968
Hydrogen Chloride, HC1 -0.651
Hydrogen Fluoride, HF -0.253
Hydrogen Iodide, HI -1.403
Hydrogen Sulphide, C
2
S -0.751
Kryton, Kr -0.853
Methane, CH
4
-0.512
Neon, Ne -0.205
Nitric Oxide, NO +44.2
Nitrogen, N
2
-0.358
Nitrogen Dioxide, NO
2
+28.7
n-Octane, C
8
H
18
-2.840
Oxygen, O
2
+100.0
n-Pentane, C
5
H
12
-1.810
iso-Pentane, C
5
H
12
-1.853
neo-Pentane, C
5
H
12
-1.853
Propane, C
3
H
8
-1.135
Propylene, C
3
H
6
-0.903
Water, H
2
O -0.381
Xenon, Xe -1.340
T
ABLE
3-3. O
XYGEN
E
QUIVALENT OF
C
OMMON
G
ASES