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The following chart outlines electrochemical sensor cross interference levels.

Sensor CO CO
(H2 Low)
H2S
(Ventis)
H2S
(Tango, MX6)
SO2 NO2 Cl2 ClO2 HCN HCl PH3 NO H2 NH3
Carbon Monoxide
(CO)
100% 100% 1% 1% 1% 0% 0% 0% 0% 0% 0% 0% 20% 0%
Hydrogen Sulfide
(H2S)
5% 5% 100% 100% 1% -40% -3% -25% 10% 300% 25% 10% 20% 25%
Sulfur Dioxide
(S02)
0% 5% 5% 5% 100% 0% 0% -5% 10% 40% -1% 0% 0% -40%
Nitrogen Dioxide
(N02)
-5% 5% -25% -25% -165% 100% 45% 50% -70% -- -11% 30% 0% -10%
Chlorine
(Cl2)
-10% 0% -20% -20% -25% 10% 100% 60% -20% 6% -20% 0% 0% -50%
Chlorine Dioxide
(ClO2)
-- -- -- -- -- -- 20% 100% -- -- -- -- -- --
Hydrogen Cyanide
(HCN)
15% 5% -1% -5% 50% 1% 0% 0% 100% 35% 4% 0% 30% 5%
Hydrogen Chloride
(HCl)
3%  -- 0% 0% 5% 0% 2% 0% 0% 100% 0% 15% 0% 0%
Phosphine
(PH3)
80% 415% 60% 55% 20% -130% -225% -100% 425% 300% 100% 10% -30% 15%
Nitric Oxide
(NO)
25% 40% 1% -0.2% 1% 5% 10% -- -5% -- -1% 100% 30% 0%
Hydrogen
(H2)
22% 3% 0.3% 0.08% 0.5% 0% 0% 0% 0% 0% 0% 0% 100% 0%
Ammonia
(NH3)
0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 100%
Acetylene 202% 177% 0% 0% 138% 0% -- -- -- 8% -- -- -- --
Ethylene 77%* (100%) 55%* 0% 0% -- -- -- -- -- -- -- -- -- --
Ethanol 0%* (50%)  0%* (65%) 0% 0% -- -- -- -- -- -- -- -- -- --
Methyl Mercaptan --  -- -- 77% -- -- -- -- -- -- -- -- -- --
Ethyl Mercaptan -- -- -- 34% -- -- -- -- -- -- -- -- -- --

* new sensor() aged sensor or saturated filter

Table is current as of July 15, 2019

1. The table above reflects the percentage response provided by the sensor listed across the top of the chart when exposed to a known concentration of the target gas listed in the left hand column. “—” means no data available.

2. The specified cross interference numbers apply to new sensors only and may vary with time. They also vary from sensor to sensor.

3. The numbers are measured under environment of 20 °C, 50% RH and 1 atm.

4. This table is given as a reference only and is subject to change.