Teledyne 3020M - Explosion proof paramagnetic oxygen analyzer - Manual (Page 18)

2-4
2 Operational Theory Model 3020M
Teledyne Analytical Instruments
Gas Cross Gas Cross
Sensitivity Sensitivity
in vol. % in vol. %
Acetylene C
2
H
2
-0.24 Hydrogen chloride HCI -0.30
Allene C
3
H
4
-0.44 Hydrogen fluoride HF +0.10
Ammonia NH
3
-0.26 Hydrogen iodide HI -1.10
Argon Ar -0.22 Hydrogen sulphide H
2
S -0.39
Bromine Br
2
-1.30 Iodine I -2.40
1.2 Butadiene C
4
H
6
-0.49 Isobutane C
4
H
10
-1.11
1.3 Butadiene C
4
H
6
-0.49 Isopantane C
5
H
12
-1.49
n-Butane C
4
H
10
-1.11 Krypton Kr -0.51
I-Butane C4H8 -085 Laughing gas N
2
O -0.20
cis 2-Butane C
4
H
8
-0.89 Methane CH
4
-0.20
trans 2-Butane C
4
H
8
-0.92 Neon Ne +0.13
Carbon dioxide CO
2
-0.27 Neopentane C
5
H
12
-1.49
Carbon monoxide CO +0.06 Nitric acid HNO
3
+0.43
Chlorine Cl
2
-0.77 Nitrogen dioxide NO
2
+28.00
Cyclo hexane C
6
H
12
-1.56 Nitrous oxide NO +40.00
Ethane C
2
H
6
-0.43 n-Octane C
8
H
18
-2.50
Ethylene C
2
H
4
-0.26 n-Pentane C
5
H
12
-1.45
Helium He +0.30 Propane C
3
H
8
-0.86
n-Heptane C
7
H
16
-2.10 Propylene C
3
H
6
-0.55
n-Hexane C
6
H
14
-1.70 Vinyl chloride -0.63
Hydrogen H
2
+0.24 Water H
2
O -0.02
Hydrogen bromide HBr -.0.61 Xenon Xe -0.95
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
2
, 40 % of N
2
, and 50%
of Ar.
C0
2
: -0.27 x 10% = -0.027
Ar: -0.22x5O%= -0.11
TOTAL CROSS INTERFERENCE -0.137
Calculation of the zero value: