WT.050.130.000.UA.IM.1108
ACUTEC
™
35 SYSTEM
3
1.2 Interferences
Electrochemical sensors are, by nature, not 100% selective; therefore,
they can exhibit response to other gases present in ambient air.
The following tables list the possible interferences that may occur when
using the different gas sensors. The tables indicate the relative response
of the sensor to 1 ppm of the listed gas, expressed in terms of relative
ppm signal. For example: exposure of a chlorine sensor to a gas sample
containing 1 ppm of nitrogen dioxide (NO
2
) would produce a signal equal
to 0.4 ppm of chlorine. A negative sign (-) indicates an interference that
can cause low gas measurements if there is a mixture of the measured
gas and another gas.
CHLORINE
Interference Gas
Response
Bromine
1.0
Fluorine
1.0
Chlorine Dioxide
1.0
Ozone
1.0
Nitrogen Dioxide
0.4
Hydrogen Sulfide
-0.1
Hydrogen Cyanide
-0.05
Methyl Mercaptan
-0.04
Sulfur Dioxide
-0.01
SULFUR DIOXIDE
Interference Gas
Response
Nitrogen Dioxide
0.8
Hydrogen Cyanide
0.15
Nitric Oxide
0.04
Acetylene
0.02
Ethanol
0.05
Hydrogen
0.005
Bromine
-0.1
Fluorine
-0.1
Chlorine Dioxide
-0.1
Ozone
-0.1
