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1 Operational Theory
Gas
Acetylene C
H
2
2
Allene C
H
3
4
Ammonia NH
3
Argon Ar
Bromine Br
2
1.2 Butadiene C
H
4
6
1.3 Butadiene C
H
4
6
n-Butane C
H
4
10
I-Butane C4H8
cis 2-Butane C
H
4
8
trans 2-Butane C
H
4
8
Carbon dioxide CO
2
Carbon monoxide CO
Chlorine Cl
2
Cyclo hexane C
H
6
12
Ethane C
H
2
6
Ethylene C
H
2
4
Helium He
n-Heptane C
H
7
16
n-Hexane C
H
6
14
Hydrogen H
2
Hydrogen bromide HBr
With gas mixtures the components are weighted according to their
proporational volumes.
The cross interference with a gas mixture can be determined in advance if the
concentration of the individual background gases is known.
Example:
Cross sensitivity calculation for a gas mixture:
The gas to be measured consists of 10 % CO
of Ar.
TOTAL CROSS INTERFERENCE -0.137
Calculation of the zero value:
(0% 0
) - (Cross Interference Value) = Zero Point Value
2
0% -(-0.137) = +0.137%0
1-4: Part II
Cross
Sensitivity
in vol. %
-0.24
-0.44
-0.26
-0.22
-1.30
-0.49
-0.49
-1.11
-085
-0.89
-0.92
-0.27
+0.06
-0.77
-1.56
-0.43
-0.26
+0.30
-2.10
-1.70
+0.24
-.0.61
C0
: -0.27 x 10% = -0.027
2
Ar: -0.22x5O%= -0.11
2
Teledyne Analytical Instruments
Gas
Hydrogen chloride HCI
Hydrogen fluoride HF
Hydrogen iodide HI
Hydrogen sulphide H
S -0.39
2
Iodine I
Isobutane C
H
4
10
Isopantane C
H
5
12
Krypton Kr
Laughing gas N
O
2
Methane CH
4
Neon Ne
Neopentane C
H
5
12
Nitric acid HNO
3
Nitrogen dioxide NO
2
Nitrous oxide NO
n-Octane C
H
8
18
n-Pentane C
H
5
12
Propane C
H
3
8
Propylene C
H
3
6
Vinyl chloride
Water H
O
2
Xenon Xe
, 40 % of N
2
Model 3010M
Cross
Sensitivity
in vol. %
-0.30
+0.10
-1.10
-2.40
-1.11
-1.49
-0.51
-0.20
-0.20
+0.13
-1.49
+0.43
+28.00
+40.00
-2.50
-1.45
-0.86
-0.55
-0.63
-0.02
-0.95
, and 50%
2
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