Introduction
There is no such thing as a perfect gas sensor. All gas sensors have a sensitivity to other gases. The question is to what degree? Defining this degree of sensitivity is a term called cross-sensitivity.
What is Gas Sensor Cross-Sensitivity
While a sensor may be primarily designed to detect a specific gas, it will exhibit a response to other gases. This cross-sensitivity can potentially lead to inaccurate measurements or false alarms if not correctly accounted for.
What Factors Determine Cross-Sensitivity?
The fundamentals of electrochemical gas sensors and metal oxide semiconducting gas sensors involve the oxidation or reduction of the target gas at the electrode surface, which generates a current proportional to the gas concentration. Cross-sensitivity occurs when other gases also react with the electrode surface and produce a current, which interferes with the target gas signal. The degree of cross-sensitivity depends on various factors, such as the electrode material, the gas diffusion rate, test flow rates, sensor age, calibration exposure time, soak time, recovery time since prior exposure, and the operating temperature and humidity.
How Can I Minimize Cross-Sensitivity?
To minimize cross-sensitivity, several strategies can be employed, such as using gas filters, optimizing the sensor design, and applying calibration and compensation techniques.
What type of cross-sensitivities are there?
- Positive Response: The sensor responds to the target gas and another gas. This response gives the user the impression that there is target gas present when there isn’t or more target gas present than is the case. The result is a superposition.
- Negative Response: The sensor produces a reduced response to the target gas and may neutralize the positive response from the target gas. This often occurs when both reducing and oxidizing gases are present, which can cancel the sensor output signal. From a safety standpoint, a negative cross-sensitivity presents a higher risk than a positive one, as it will diminish the response to the target gas and may prevent an alarm.
- Inhibition: A gas or gas matrix inhibits the detection of the target gas analyte from creating a positive sensor response.
Cross Sensitivity and Surrogate Gas
In some cases, the cross-sensitivity behavior of a sensor is used for calibration purposes. This is only done when the target gas is unavailable in calibration gas form. Some examples include Hydrogen Peroxide and Chlorine Dioxide gas. In these cases, surrogate calibration must only be performed in a controlled laboratory environment, since cross-sensitivity magnitudes can vary due to temperature, exposure time, soak time, sensor age, humidity, and gas flow rates.
Cross-Sensitivity Tables
We have composed what we believe to be the most comprehensive Cross-Sensitivity Tables. This data has been collected over the many years of experience and testing, and in-depth literature analysis from a plethora of trusted gas sensor suppliers.
Treat the tables as estimates since cross-sensitivity magnitudes may vary up to +/-100% based on sensor design and test conditions. Quoted metrics are based on test temperature at 20 °C and humidity at 50%RH.
In addition, gas mixtures (gas matrix) are rarely tested, and results with mixed gases are unpredictable. The table is organized in alphabetical order.
Acrylonitrile (C3H3N)
Sensor Type: Electrochemical Gas Sensor
|
Gas |
Concentration (ppm) | Output Signal (in ppm C3H3N) |
|---|---|---|
| Acetylene | 10 | 10 |
| Hydrogen Sulfide | 50 | < 1.0 |
| Sulfur Dioxide | 10 | < 1.0 |
| Nitric Oxide | 50 | < 1.0 |
| Formaldehyde | 10 | < 1.0 |
| Ammonia | 50 | 0.0 |
| Carbon Monoxide | 100 | < 1.0 |
| Ethylene | 100 | < 1.0 |
| Vinyl Chlorine | 100 | < 1.0 |
| Ethanol | 200 | < 1.0 |
Acetylene (C2H2)
Sensor Type: Electrochemical Gas Sensor
| Gas | Concentration (ppm) | Output Signal (in ppm C2H2) |
|---|---|---|
| Acetylene | 10 | 10 |
| Hydrogen Sulfide | 50 | < 1.0 |
| Sulfur Dioxide | 10 | < 1.0 |
| Nitric Oxide | 50 | < 1.0 |
| Formaldehyde | 10 | < 1.0 |
| Ammonia | 50 | 0.0 |
| Carbon Monoxide | 100 | < 1.0 |
| Ethylene | 100 | < 1.0 |
| Vinyl Chlorine | 100 | < 1.0 |
| Ethanol | 200 | < 1.0 |
Alcohol
Sensor Type: Electrochemical Gas Sensor
| Gas | Concentration (ppm) | Output Signal (in ppm C4H8) |
|---|---|---|
| Methanol | 50 | 50 |
| Isobutylene* | 50 | 60 |
| Ethanol | 50 | 20 |
| Isopropanol | 50 | 30 |
Acid
Sensor Type: Electrochemical Gas Sensor
| Gas | Concentration (ppm) |
Output Signal (in ppm SO2) |
|---|---|---|
| Sulfur Dioxide* | 10 | 20 |
| Formic Acid | 10 | 20 |
| Acetic Acid | 10 | 2 |
| HCl | 10 | 1 |
Ammonia (NH3)
Sensor Type: Electrochemical Gas Sensor
| Gas | Concentration (ppm) | Output Signal (in ppm NH3) |
|---|---|---|
| Ammonia | 10 | 10 |
| Hydrogen Sulfide* | 25 | 35 |
| Carbon Dioxide | 5,000 | 0.0 |
| Carbon Monoxide | 100 | 0.0 |
| Hydrogen | 1,000 | 0.0 |
| Isobutylene | 100 | 0.0 |
| Ethanol | 200 | < 1.0 |
Arsine (AsH3)
Sensor Type: Electrochemical Gas Sensor
| Gas | Concentration (ppm) | Output Signal (in ppm AsH3) |
|---|---|---|
| Arsine | 10 | 10 |
| Sulfur Dioxide | 10 | 1.5 |
| Nitric Oxide | 35 | -0.5 |
| Ammonia | 30 | 0.0 |
| Hydrogen | 1000 | 0.7 |
| Nitrogen Dioxide | 10 | -2.0 |
| Hydrogen Sulfide | 2 | 1.8 |
| Carbon Dioxide | 5000 | 0.0 |
| Chlorine | 10 | -1.3 |
| Ethylene | 50 | 0.0 |
| Carbon Monoxide | 100 | 0.9 |
Benzene (C6H6)
Sensor Type: Photoionization Detector (PID Sensor)
| Gas | Concentration (ppm) |
Output Signal (in ppm C6H6) |
|---|---|---|
| Benzene | 10 | 10 |
| Acetone | 10 | 12 |
| Isobutylene* | 10 | 7 |
| Xylene | 10 | 5 |
| Toluene | 10 | 6 |
Bromine (Br2)
Sensor Type: Electrochemical Gas Sensor
| Gas | Concentration (ppm) | Output Signal (in ppm Br2) |
|---|---|---|
| Bromine | 10 | 10 |
| Ethylene | 100 | 0 |
| Formaldehyde | 7 | 0 |
| Carbon Monoxide | 300 | 0 |
| Ethanol | 60 | 0 |
| Hydrogen | 100 | 0 |
| Hydrogen Sulfide | 20 | < -10 |
| Hydrogen Chloride | 20 | 0 |
| Nitrogen Dioxide | 10 | 12 |
| Ozone* | 1 | 2 |
Carbon Disulfide (CS₂)
Sensor Type: Electrochemical Gas Sensor
| Gas | Concentration (ppm) | Output Signal (in ppm CS₂) |
|---|---|---|
| Carbon Disulfide | 100 | 100 |
| Ethylene | 100 | < 2 |
| Carbon Monoxide* | 200 | 100 |
| Hydrogen | 100 | 0 |
| Hydrogen Sulfide | 20 | 0 |
| Nitric Oxide | 100 | 0 |
| Nitrogen Dioxide | 20 | 0 |
| Phosphine | 20 | 0 |
| Sulfur Dioxide | 100 | 0 |
Carbon Monoxide (CO)
Sensor Type: Electrochemical Gas Sensor
| Gas | Concentration (ppm) | Output Signal (in ppm CO) |
|---|---|---|
| Carbon Monoxide | 10 | 10 |
| Hydrogen Sulfide | 15 | -0.1 |
| Sulfur Dioxide | 10 | -0.2 |
| Nitric Oxide | 50 | -16.0 |
| Nitrogen Dioxide | 10 | -2.6 |
| Ammonia | 50 | 0.0 |
| Hydrogen | 100 | 24.0 |
| Ethylene | 100 | 10.0 |
| Chlorine | 15 | -0.5 |
| Ethanol | 200 | 1.5 |
Chlorine (Cl2)
Sensor Type: Electrochemical Gas Sensor
| Gas | Concentration (ppm) | Output Signal (in ppm Cl2) |
|---|---|---|
| Chlorine | 10 | 10 |
| Hydrogen Sulfide | 10 | -12.0 |
| Sulfur Dioxide | 20 | 0.0 |
| Nitric Oxide | 10 | 0.1 |
| Nitrogen Dioxide | 10 | 20 |
| Ozone* | 10 | 20 |
| Carbon Monoxide | 100 | 0.0 |
| Ammonia | 100 | 0.1 |
| Hydrogen | 1,000 | -0.1 |
| Carbon Dioxide | 30,000 | 0.0 |
Chlorine Dioxide (ClO₂)
Sensor Type: Electrochemical Gas Sensor
| Gas | Concentration (ppm) | Output Signal (in ppm ClO2) |
|---|---|---|
| Chlorine Dioxide | 10 | 10 |
| Hydrogen Sulfide | 20 | -5.0 |
| Nitrogen Dioxide | 10 | 16.0 |
| Carbon Monoxide | 100 | 0.0 |
| Hydrogen | 3,000 | 0.0 |
| Chlorine* | 10 | 13 |
| Carbon Dioxide | 5,000 | 0.0 |
| Ozone* | 10 | 30 |
Cyclohexanol (C6H12O)
Sensor Type: Electrochemical Gas Sensor
| Gas | Concentration (ppm) | Output Signal (in ppm C6H12O) |
|---|---|---|
| Cyclohexanol | 10 | 10 |
| Carbon Dioxide | 3000 | 0 |
| Carbon Monoxide | 25 | 100 |
| Methane | 1000 | 0 |
Diborane (B2H6)
Sensor Type: Electrochemical Gas Sensor
| Gas | Concentration (ppm) | Output Signal (in ppm B2H6) |
|---|---|---|
| Diborane | 10 | 10 |
| Hydrogen Sulfide * | 5 | 2.5 |
| Sulfur Dioxide | 20 | 3.7 |
| Phosphine | 5 | 5 |
| Ammonia | 100 | 0 |
| Carbon Monoxide | 100 | 0 |
| Carbon Dioxide | 5000 | 0 |
Ethylene (C2H4)
Sensor Type: Electrochemical Gas Sensor
| Gas | Concentration (ppm) | Output Signal (in ppm C2H4) |
|---|---|---|
| Ethylene | 10 | 10 |
| Hydrogen Sulfide | 50 | < 1.0 |
| Sulfur Dioxide | 100 | < 1.0 |
| Nitric Oxide* | 100 | 60.0 |
| Formaldehyde | 10 | < 1.0 |
| Ammonia | 50 | 0.0 |
| Carbon Monoxide | 100 | < 1.0 |
| Acetylene* | 10 | 15.0 |
| Vinyl Chloride | 100 | < 1.0 |
| Ethanol | 500 | < 1.0 |
Ethylene Oxide (C2H4O)
Sensor Type: Electrochemical Gas Sensor
| Gas | Concentration (ppm) | Output Signal (in ppm ETO) |
|---|---|---|
| Ethylene Oxide | 50 | 50 |
| Carbon Monoxide | 25 | 10.0 |
| Isobutylene* | 50 | 45.0 |
| Ethylene | 50 | 35.0 |
| Acetylene | 50 | 35.0 |
| Ethanol | 100 | 45.0 |
| Methyl Alcohol | 30 | 25.0 |
| Formic Acid | 100 | 30.0 |
Formaldehyde (CH2O)
Sensor Type: Electrochemical Gas Sensor
| Gas | Concentration (ppm) | Output Signal (in ppm CH2O) |
|---|---|---|
| Formaldehyde | 10 | 10 |
| Carbon Monoxide | 50 | 1.6 |
| Ethanol | 2,000 | 1.2 |
| Acetic Acid | 2,000 | -0.3 |
| Ethylene | 100 | 0.3 |
| Methyl Alcohol | 100 | 0.1 |
| Isopropanol | 100 | 0.1 |
Fluorine (F2)
Sensor Type: Electrochemical Gas Sensor
| Gas | Concentration (ppm) | Output Signal (in ppm F2) |
|---|---|---|
| Fluorine | 10 | 10 |
| Alcohols | 1000 | 0 |
| Arsine | 0.2 | -0,03 |
| Bromine | yes;n/d | |
| Carbon Dioxide | 5000 | 0 |
| Carbon Monoxide | 100 | 0 |
| Chlorine | 1 | 1.4 |
| Diborane | 0.25 | -0.01 |
| Hydrocarbons | % range | 0 |
| Hydrochloric Acid | 5 | -7 |
| Hydrogen | 10000 | 0 |
| Hydrogen Cyanide | 1 | -0.05 |
| Hydrogen Sulfide | 1 | -2 |
| Nitrogen | 100% | 0 |
| Nitrogen Dioxide | 10 | 8 |
| Ozone | 0.25 | 0.3 |
| Phosphine | 0.3 | approx. -0.1 ppm; n/d |
| Sulfur Dioxide | 20 | -0.2 |
Hydrazine (N2H4)
Sensor Type: Electrochemical Gas Sensor
| Gas | Concentration (ppm) | Output Signal (in ppm F2) |
|---|---|---|
| Hydrazine | 10 | 10 |
| Ammonia | 1.2 | 1 |
| Carbon Dioxide | 1000 | 0 |
| Carbon Monoxide | 1 | 1.8 |
| Methane | 1000 | 0 |
| Methylhydrazine | 1 | 0.8 |
Hydrogen (H2)
Sensor Type: Electrochemical Gas Sensor
| Gas | Concentration (ppm) | Output Signal (in ppm H2) |
|---|---|---|
| Hydrogen | 100 | 100 |
| Hydrogen Sulfide | 25 | 0.0 |
| Sulfur Dioxide | 5 | 0.0 |
| Carbon Monoxide | 50 | 200.0 |
| Nitric Oxide | 35 | < 10.0 |
| Nitrogen Dioxide | 5 | 0.0 |
| Ethylene | 100 | 80.0 |
| Chlorine | 10 | 0.0 |
Hydrogen Bromide (HBr)
Sensor Type: Electrochemical Gas Sensor
| Gas | Concentration (ppm) | Output Signal (in ppm HBr) |
|---|---|---|
| Hydrogen Bromide | 10 | 10 |
| Chlorine | 20 | -8 |
| Carbon Monoxide | 100 | 1 |
| Hydrogen | 1,000 | <1 |
| Nitrogen Dioxide | 10 | 2 |
| Sulfur Dioxide | 20 | 52 |
| Ethylene | 100 | 1 |
| Hydrogen Sulfide | 5 | 60 |
Hydrogen Chloride (HCl)
Sensor Type: Electrochemical Gas Sensor
| Gas | Concentration (ppm) | Output Signal (in ppm HCl) |
|---|---|---|
| Hydrogen Chloride | 10 | 10 |
| Carbon Monoxide | 100 | 0.0 |
| Sulfur Dioxide* | 10 | 25.0 |
| Nitric Oxide | 20 | 50.0 |
| Nitrogen Dioxide | 10 | 1.0 |
| Hydrogen | 2,000 | 0.0 |
| Hydrogen Sulfide | 25 | 100.0 |
| Nitrogen | 100% | 0.0 |
| Chlorine | 20 | -5.0 |
Hydrogen Cyanide (HCN)
Sensor Type: Electrochemical Gas Sensor
| Gas | Concentration (ppm) | Output Signal (in ppm HCN) |
|---|---|---|
| Hydrogen Cyanide | 10 | 10 |
| Carbon Monoxide | 300 | 0.0 |
| Sulfur Dioxide | 5 | 18.1 |
| Nitric Oxide | 35 | 0.0 |
| Nitrogen Dioxide | 5 | -9.5 |
| Hydrogen Sulfide | 5 | 14.9 |
| Ethylene | 100 | 0.0 |
| Carbon Dioxide | 5000 | 0.0 |
| Ethanol | 600 | 0.0 |
Hydrogen Fluoride (HF)
Sensor Type: Electrochemical Gas Sensor
| Gas | Concentration (ppm) | Output Signal (in ppm HF) |
|---|---|---|
| Hydrogen Fluoride | 10 | 10 |
| Hydrogen Sulfide | 25 | -1.0 |
| Sulfur Dioxide | 20 | -0.2 |
| Nitric Oxide | 50 | 0.0 |
| Nitrogen Dioxide | 5 | 4.3 |
| Carbon Monoxide | 100 | 0.0 |
| Hydrogen | 1,000 | 0.0 |
Hydrogen Peroxide (H2O2)
Sensor Type: Electrochemical Gas Sensor
| Gas | Concentration (ppm) | Output Signal (in ppm H2O2) |
|---|---|---|
| Hydrogen Peroxide | 10 | 10 |
| Sulfur dioxide | 20 | 20 |
Hydrogen Sulfide (H₂S)
Sensor Type: Electrochemical Gas Sensor
| Gas | Concentration (ppm) | Output Signal (in ppm H2S) |
|---|---|---|
| Hydrogen Sulfide | 10 | 10 |
| Carbon Monoxide | 100 | 0.0 |
| Nitric Oxide | 50 | -0.7 |
| Nitrogen Dioxide | 10 | -2.1 |
| Ammonia | 50 | 3.8 |
| Hydrogen | 1,000 | 0.0 |
| Chlorine | 15 | -7.8 |
| Sulfur Dioxide | 20 | 16.1 |
| Ethylene | 100 | 0.0 |
| Ethanol | 2,000 | 0.0 |
Mercaptan (CH4S)
Sensor Type: Electrochemical Gas Sensor
| Gas | Concentration (ppm) | Output Signal (in ppm CH4S) |
|---|---|---|
| Methanethiol | 10 | 10 |
| Carbon Monoxide | 50 | < 5.5 |
| Sulfur Dioxide | 5 | < 2.1 |
| Nitrogen Dioxide | 5 | < -3.5 |
| Nitric Oxide | 25 | 0.0 |
| Ammonia | 50 | 0.0 |
| Hydrogen | 1,000 | < 10.0 |
| Hydrogen Sulfide | 25 | 40.0 |
Nitric Oxide (NO)
Sensor Type: Electrochemical Gas Sensor
| Gas | Concentration (ppm) | Output Signal (in ppm NO) |
|---|---|---|
| Nitric Oxide | 10 | 10 |
| Hydrogen Sulfide | 25 | 11.0 |
| Carbon Monoxide | 100 | 0.0 |
| Nitrogen Dioxide | 5 | < 0.2 |
| Sulfur Dioxide | 5 | < 0.3 |
| Ethylene | 100 | 0.0 |
| Hydrogen | 1,000 | < 0.3 |
Nitrogen Dioxide (NO₂)
Sensor Type: Electrochemical Gas Sensor
| Gas | Concentration (ppm) | Output Signal (in ppm NO2) |
|---|---|---|
| Nitrogen Dioxide | 10 | 10 |
| Hydrogen Sulfide | 15 | < -5.0 |
| Carbon Monoxide | 300 | 0.0 |
| Nitric Oxide | 35 | 0.0 |
| Chlorine | 10 | 1 |
| Sulfur Dioxide | 5 | -5.0 |
| Ozone | 10 | 5 |
Ozone (O₃)
Sensor Type: Electrochemical Gas Sensor
| Gas | Concentration (ppm) | Output Signal (in ppm O3) |
|---|---|---|
| Ozone | 10 | 10 |
| Hydrogen Sulfide | 20 | -4.0 |
| Sulfur Dioxide | 20 | < 1.0 |
| Nitric Oxide | 50 | < 1.0 |
| Nitrogen Dioxide | 10 | 10 |
| Carbon Monoxide | 100 | 0.0 |
| Ammonia | 100 | 0.0 |
| Hydrogen | 1,000 | 0.0 |
| Chlorine | 10 | 9.0 |
| Carbon Dioxide | 10,000 | 0.0 |
Oxygen (O₂)
Sensor Type: Electrochemical Gas Sensor
| Gas | Concentration | Output Signal (in %O2 equivalent) |
|---|---|---|
| Oxygen | 10% | 10% |
| Carbon Dioxide | 5% | 0.1% |
| Hydrogen | 0.2% | -0.2% |
Phosgene (COCl2)
Sensor Type: Electrochemical Gas Sensor
| Gas | Concentration (ppm) | Output Signal (in ppm COCl2) |
|---|---|---|
| Phosgene | 10 | 10 |
| Chlorine | 5 | 26.4 |
| Carbon Dioxide | 3,000 | 0.0 |
| Carbon Monoxide | 50 | 0.0 |
| Hydrogen | 1,000 | 0.0 |
| Hydrogen Sulfide | 5 | -3.3 |
| Ammonia | 10 | -2.5 |
| Nitric Oxide | 10 | 0.0 |
Phosphine (PH₃)
Sensor Type: Electrochemical Gas Sensor
| Gas | Concentration (ppm) | Output Signal (in ppm PH3) |
|---|---|---|
| Phosphine | 10 | 10 |
| Hydrogen Sulfide | 15 | 12.0 |
| Sulfur Dioxide | 20 | 6.2 |
| Ammonia | 50 | 0.0 |
| Hydrogen | 1,000 | 0.0 |
| Carbon Monoxide | 1,000 | 0.0 |
| Ethylene | 100 | 0.0 |
Silane (SiH4)
Sensor Type: Electrochemical Gas Sensor
| Gas | Concentration (ppm) | Output Signal (in ppm SiH4) |
|---|---|---|
| Silane | 10 | 10 |
| Sulfur Dioxide | 20 | 6.6 |
| Nitric Oxide | 50 | 0.0 |
| Ammonia | 50 | 0.0 |
| Carbon monoxide | 100 | 4.1 |
| Nitrogen Dioxide | 10 | -3.1 |
| Hydrogen Sulfide | 2 | 1.7 |
| Chlorine | 15 | -3.9 |
Sulfur Dioxide (SO2)
Sensor Type: Electrochemical Gas Sensor
| Gas | Concentration (ppm) | Output Signal (in ppm SO2) |
|---|---|---|
| Sulfur Dioxide | 10 | 10 |
| Hydrogen Sulfide | 15 | 0.1 |
| Carbon Monoxide | 100 | 0.0 |
| Nitric Oxide | 50 | 0.1 |
| Nitrogen Dioxide | 5 | -5.5 |
| Hydrogen | 1,000 | 0.2 |
| Ammonia | 20 | 0.0 |
| Chlorine | 5 | -1.5 |
| Acetylene | 10 | < 2.0 |
| Ethylene | 50 | 0.2 |
Styrene
Sensor Type: Electrochemical Gas Sensor
| Gas | Concentration (ppm) | Output Signal (in ppm VOC) |
|---|---|---|
| Styrene | 10 | 10 |
| Isobutylene * | 10 | 10 |
| Ethylene | 5 | 3.16 |
| Formaldenhyde | 5 | 6 |
| Methyl Mercaptan | 5 | 7 |
| Ethylene Oxide | 5 | 3.83 |
| Ethanol | 5 | 1.83 |
| Carbon Disulfide | 5 | 1.23 |
| Dimethyl Disulfide | 2 | 6.8 |
| Methanol | 5 | 5.95 |
| Methyl Sulfide | 5 | 8.97 |
| Styrene | 0.5 | 7.5 |
| Benzene | 5 | 1.1 |
| Toluene | 5 | 0.81 |
| O-xylene | 5 | 0.58 |
| Gasoline Volatilization (dimensionless) |
/ | Responded well |
| Acrylonitrile | / | Responded well |
| Acetylene | / | Responded well |
| Formic acid | 5 | 5.36 |
| Acetic acid | 5 | 1.1 |
| Carbon Monoxide | 5 | 3.38 |
| Hydrogen Chloride | 5 | 0.27 |
| Hydrogen Cyanide | 5 | 0.36 |
| Ammonia | 5 | 1.5 |
| Hydrogen | 5 | 1.15 |
| Trimethylamine | 5 | 0.65 |
| Nitrogen Dioxide | 5 | 1.86 |
Tetrahydrothiophene (C4H8S) THT
Sensor Type: Electrochemical Gas Sensor
| Gas | Concentration ( mg/m3) | Output Signal (in mg/m3 C4H8S) |
|---|---|---|
| Tetrahydrothiophene | 10 | 10 |
| Hydrogen Sulfide | 25 | 8.5 |
| Carbon Monoxide | 50 | 0.1 |
| Nitric Oxide | 35 | < 130.0 |
| Sulfur Dioxide | 5 | 0.0 |
| Nitrogen Dioxide * | 10 | 16.0 |
Vinyl Chloride (C2H3Cl)
Sensor Type: Electrochemical Gas Sensor
| Gas | Concentration (ppm) | Output Signal (in ppm C2H3Cl) |
|---|---|---|
| Vinyl Chloride | 10 | 10 |
| Carbon Monoxide | 25 | 15.0 |
| Isobutylene | 50 | 35.0 |
| Ethylene | 50 | 65.0 |
| Acetylene | 50 | 85.0 |
| Ethanol | 100 | 55.0 |
Volatile Organic Compound (VOC)
Sensor Type: Electrochemical Gas Sensor
| Gas | Concentration (ppm) | Output Signal (in ppm VOC) |
|---|---|---|
| Volatile Organic Compound | 10 | 10 |
| Isobutene | 5 | 5 |
| Ethylene | 5 | 3.16 |
| Formaldenhyde | 5 | 6 |
| Methyl Mercaptan | 5 | 7 |
| Ethylene Oxide | 5 | 3.83 |
| Ethanol | 5 | 1.83 |
| Carbon Disulfide | 5 | 1.23 |
| Dimethyl Disulfide | 2 | 6.8 |
| Methanol | 5 | 5.95 |
| Methyl Sulfide | 5 | 8.97 |
| Styrene | 0.5 | 7.5 |
| Benzene | 5 | 1.1 |
| Toluene | 5 | 0.81 |
| O-xylene | 5 | 0.58 |
| Gasoline Volatilization (dimensionless) |
/ | Responded well |
| Acrylonitrile | / | Responded well |
| Acetylene | / | Responded well |
| Formic acid | 5 | 5.36 |
| Acetic acid | 5 | 1.1 |
| Carbon Monoxide | 5 | 3.38 |
| Hydrogen Chloride | 5 | 0.27 |
| Hydrogen Cyanide | 5 | 0.36 |
| Ammonia | 5 | 1.5 |
| Hydrogen | 5 | 1.15 |
| Trimethylamine | 5 | 0.65 |
| Nitrogen Dioxide | 5 | 1.86 |