PortaSens
III
Portable Gas Leak Detector, Model D16
Operation and Maintenance Manual
Rev-A Feb 2018
- 44 -
Gas Interferences
Some sensors exhibit a minor sensitivity to non-target gases and vapors.
Table 18 lists the cross-sensitivity factors of sensors to various,
“interference” gases. To use the table, find the sensor type along the top,
and then scan down the column for the factor corresponding to one of the
interference gases listed on the left. Multiplying the factor times the
concentration of the interference gas produces the reading that would be
displayed by the device. For example, an SO
2
sensor exposed to 1 PPM of
HCN would produce a reading of 0.40 PPM. See notes following the table for
additional comments.
Table 18. Cross-sensitivity factors.
Sensor Type
NH
3
CI
2
O
3
HF
HCI
HCN H
2
S
SO
2
CO H
2
H
2
O
2
O
2
NO
NO
2
Hydride (4) SiH
4
COCl
2
H-C
NH
3
--
-0.05
-0.005
CO
0.01
0.005
0.01
0.01
--
0.1 0.05
-0.05 (0.05)
0.08
0.3
H
2
0.002
0.01
0.01
0.0003
0.1 --
0.03
-0.06
0.014
0.05
NO
0.08
1.5
0.4
0.08
0.1
0.09
--
(0.04)
2.0
-0.1
0.8
O
2
*
*
*
*
*
*
*
*
--
*
*
*
*
*
Cl
2
-0.5
--
1
2
-0.05
-0.2
-0.4
1.0
-0.01 (-0.1)
-0.2
0.1
O
3
0.05 --
1
-0.05
-0.2
-0.4
1.0
(-0.1)
-0.2
HCl
-0.5
0.5
--
-0.005 0.02
-0.06 (-0.01)
0.05
0.2
HCN
0.1
-0.08 -0.5
-0.1
0.01
--
0.4
0.1
-0.2
0.05 (0.2)
0.2
0.5
0.1
HF
--
H
2
S
1.0
-0.1
-0.1
-0.3
3
--
6
-5.0
2
2
NO
2
0.08
0.2
0.15 0.2
0.2
0.01
-0.3
-0.1
--
-0.001 (-0.1) 0.04
-1
0.1
SO
2
-0.1
-0.01 -0.01 1
0.5
0.4
0.08
--
0.42
-0.8
(0.5)
0.1
0.2
0.4
Hydride
1.5
0.2
0.1
1
6
-3.5
--
5
2
SiH
4
1.5
0.2
0.1
0.3
6
2
0.005 (0.5)
--
2
CO
2
CH
4
CH
3
SH
0.3
-0.04 -0.03 -0.1
1
0.3
2
-1.5
1
C
2
H
2
.0005 0.002
1.7
0.1 0.1 0.02
0.005 -0.02 0.0001 (0.5)
0.05
1.2
C
2
H
4
0.002
0.3
0.1 0.1
-0.01 (0.1)
0.02
1
C
2
H
6
O
0.015
0.05
0.02
0.015
0.015
0.1
-0.07 (0.02)
0.1
0.7
COCl
2
--
Int
erf
ere
n
ce
G
as
