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Gas Detection
Sulphur dioxide cross references
| Gas | Concentration | Response |
|---|---|---|
| Sulphur dioxide (SO2) | ||
| CO | 50 ppm | 0,3 ppm |
| CO | 300 ppm | <3 ppm |
| CO2 | 1,5 % | 0 ppm |
| CS2 | 20 ppm | 0,3 ppm |
| CS2 | 2000 ppm | 14 ppm |
| H2S | 15 ppm | 0 ppm |
| H2S | 250 ppm | 0,3 ppm |
| H2SO4 | saturated | 0 ppm |
| NH3 | 100 ppm | 0 ppm |
| NO | 25 ppm | <= -2 ppm* |
| NO2 | 5 ppm | about -5 ppm |
| HCl | 0.5 ppm | 0 ppm |
| ClO2 | 10 ppm | <= -2 ppm* |
| HF | 70 ppm | 0 ppm |
| Acetylene | 10 ppm | 1 ppm |
| Acetylene | 100 ppm | 10 ppm |
| Toluene | 100 ppm | 0 ppm |
| Isobutylene | 100 ppm | 0.4 ppm |
| 1,3-Butadiene | 5 ppm | 4.3 ppm" |
| Styrene | 200 ppm | >40 ppm |
Note: All data above are valid for sensors by RAE Systems.
*More negative than -2 ppm
"Cannot be removed by activated carbon because of SO2 loss
Phosphine cross references
| Gas | Concentration | Response |
|---|---|---|
| Phosphine (PH3) | ||
| Arsine | 150 ppb | 0 ppb |
| Arsine | 2000 ppb | 1200 ppb* |
| Silane | 1000 ppb | 900 ppb |
| Diborane | 300 ppb | 105 ppb |
| Germane | 600 ppb | 510 ppb |
| NH3 | 100 ppm | 0 ppm |
| NO | 100 ppm | 0 ppm |
| SO2 | 5 ppm | 1 ppm |
| CO | 1000 ppm | 1 ppm |
| CO2 | 50 000 ppm | 0 ppm |
| H2 | 1000 ppm | 30 ppm |
| H2S | 25 ppm | 5 ppm |
| HCN | 10 ppm | 0,6 ppm |
| HCl | 10 ppm | 0,2 ppm |
| Methane | 50 000 ppm | 0 ppm |
| Ethylene | 100 ppm | 1,8 ppm |
| Isobutylene | 250 ppm | 0 ppm |
| Hexane, n- | 1500 ppm | 0 ppm |
| Benzene | 100 ppm | 0 ppm |
| Toluene | 100 ppm | 0 ppm |
| Ethylene oxide | 10 ppm | 0 ppm |
| CF2Cl2 | 100 ppm | 0 ppm |
Note: All data above are valid for sensors by RAE Systems.
*Response after 9 minutes exposure. CF = 1,7 average, tested in range 500 to 3000 ppb AsH3.
Nitrogen dioxide cross references
| Gas | Concentration | Response |
|---|---|---|
| Nitrogen dioxide (NO2) | ||
| NO | 25 ppm | 2,2 ppm |
| NH3 | 50 ppm | -0,2 ppm |
| CO | 50 ppm | -0,2 ppm |
| CO | 300 ppm | 15 ppm |
| H2S | 25 ppm | -2,2 ppm |
| SO2 | 5 ppm | 0 ppm |
| HCl | 10 ppm | 0 ppm |
| Ci2 | 1 ppm | -1 ppm |
| ClO2 | 1 ppm | -2 ppm |
| HNO3 | 1997 ppm | 12,1 ppm |
Note: All data above are valid for sensors by RAE Systems.
Nitric oxide cross references
| Gas | Concentration | Response |
|---|---|---|
| Nitric oxide (NO) | ||
| CO | 300 ppm | 0 ppm |
| SO2 | 5 ppm | 0 ppm |
| H2S | 25 ppm | 2 - 9 ppm |
| ClO2 | 1 ppm | -0,2 ppm |
| NH3 | 50 ppm | 0 ppm |
| NO2 | 5 ppm | about 0,5 ppm |
| HCl | 10 ppm | about 0,5 ppm |
| HNO3 | 1997 ppm | 13,2 ppm |
Note: All data above are valid for sensors by RAE Systems.
Hydrogen Fluoride cross references
| Gas | Concentration | Response |
|---|---|---|
| Hydrogen Fluoride (HF) | ||
| Acetic acid | 100 ppm | yes |
| SO2 | 20 ppm | 16 ppm |
| Cl2 | 1 ppm | 0,7 ppm |
| CO | 100 ppm | 0 ppm |
| CO2 | 5 000 ppm | 0 ppm |
| H2 | 3 000 ppm | < 1 ppm |
| Alcohols | 1 000 ppm | 0 ppm |
| Hydrocarbons | % range | 0 ppm |
| HCl | 10 ppm | 6 ppm |
Note: All data above are valid for sensors by RAE Systems.
Hydrogen Chloride cross references
| Gas | Concentration | Response |
|---|---|---|
| Hydrogen chloride (HCl) | ||
| Acetic acid | 100 ppm | yes |
| SO2 | 20 ppm | 16 ppm |
| Cl2 | 1 ppm | 0,7 ppm |
| CO | 100 ppm | 0 ppm |
| CO2 | 5 000 ppm | 0 ppm |
| H2 | 3 000 ppm | < 1 ppm |
| Alcohols | 1 000 ppm | 0 ppm |
| Hydrocarbons | % range | 0 ppm |
| HF | 6 ppm | 10 ppm |
| HNO3 | 1997 ppm | 10 ppm |
Note: All data above are valid for sensors by RAE Systems.
Chlorine dioxide cross references
| Gas | Concentration | Response |
|---|---|---|
| Chlorine dioxide (ClO2) | ||
| Cl2 | 1 ppm | 0 ppm* |
| Cl2 | 1 ppm | 0,4 ppm" |
| ClF3 | 1 ppm | 1 (theor) ppm |
| O3 | 0,1 ppm | 0,03 ppm |
| H2S | 10 ppm | 0 ppm |
| H2S | 25 ppm | -1,1 ppm" |
| SO2 | 5 ppm | 0 ppm" |
| CO | 1000 ppm | 0 ppm |
| CO | 50 ppm | 0 ppm" |
| CO2 | 5000 ppm | 0 ppm |
| HCl | 5 ppm | 0 ppm |
| HF | 3 ppm | 0 ppm |
| H2 | 10 000 ppm | 0 ppm |
| NH3 | 50 ppm | 0 ppm" |
| PH3 | 300 ppm | 0.3 ppm |
| AsH3 | 1 ppm | 0.8 ppm |
| HCN | 10 ppm | 0 ppm |
| H2Se | 0.1 ppm | 0 ppm |
| NO | 25 ppm | 0.9 ppm" |
| NO2 | 5 ppm | 1,5 to 2,3 ppm" |
| Chloropicrin | 100 ppm | 0 ppm" |
| Hydrocarbons | % range | 0 % |
| Alcohols | 1000 ppm | 0 ppm |
Note: All data above are valid for sensors by RAE Systems.
*Short exposure of < few minutes of < 100 ppm, with filter
"Onboard filter removed
Gas Dryers and Humidifiers
Gas Dryes
Gas dryers are commonly used in analytical instruments such as gas chromatographs, thermal desorbers, etc... They also are used in sample conditioning systems, where is a need of water removal from gaseous samples to avoid water condensation in sample lines and in gas analysers.
- Nafion dryers - details
- Nafion dryers - products
- Nafion dryers - table quick guide
- Adsorption dryers
- Gas coolers
Humidifiers
Humidifiers are mostly used in medical devices and in calibration systems, where is a need to supply a gas of stable humidity. New area where gas humidifiers are used is micro-fuel cells as a power sources. These micro-fuel cells require humid hydrogen and Nafion dryers are the best choice for this purpose.
Carbon dioxide cross references
| Gas | Concetration | Response |
|---|---|---|
| Carbon dioxide (CO2) | ||
| CH4 | 25 000 ppm | < 20 ppm |
| Ethane | 10 000 ppm | < 20 ppm |
| Ethylene | 13 500 ppm | < 20 ppm |
| Acetylene | 12 500 ppm | < 20 ppm |
| Propane | 10 000 ppm | < 20 ppm |
| Acetone | 10 000 ppm | < 20 ppm |
| Carbon disulphide | 10 000 ppm | < 20 ppm |
Note: All data above are valid for sensors by RAE Systems.