Description
Chlorine Dioxide (ClO2) is a synthetic, greenish-yellow to reddish-yellow gas with a sharp, irritating odour similar to chlorine or nitric acid. Unlike chlorine, ClO2 is not stored or shipped as a compressed gas due to its instability and explosive nature. Instead, it is almost always generated on-site, just before use, by reacting sodium chlorite with an oxidiser (like chlorine gas or sodium hypochlorite) or an acid.
Key Properties
- Colour: Greenish-yellow to reddish-yellow.
- Odour: Sharp, irritating, chlorine-like. Detectable at very low concentrations.
- Toxicity: Highly toxic, causing severe irritation to the respiratory system, eyes, and skin.
- Density: Heavier than air, so it tends to accumulate in low-lying areas and confined spaces.
- Reactivity/Instability: Extremely reactive and can be explosive at high concentrations, especially when mixed with air, or under pressure, heat, or light. This is why it’s generated on-site.
- Powerful Oxidiser: A very effective disinfectant and bleaching agent.
Replacement Sensor, Part No. 17124975-8, Properties
Gas Detected (Abbreviation) |
Type | Measurement | Response time (Seconds) |
Calibration Gas & Concentration |
||
---|---|---|---|---|---|---|
Range | Resolution | T50 | T90 | |||
Chlorine Dioxide (ClO2) |
Electrochemical | 0 to 1 ppm | 0.01 ppm | 7 | 60 | ClO2 1 ppm |
Toxic Gas Sensor Cross-sensitivity Table
Target Gas | Sensor | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
CO | CO (H2 Low) |
H2S | SO2 | NO2 | Cl2 | ClO2 | HCN | HCl | PH3 | NO | H2 | NH3 | |
CO | 100 | 100 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 20 | 0 |
H2S | 5 | 5 | 100 | 1 | -40 | -3 | -25 | 10 | 300 | 25 | 10 | 20 | 25 |
SO2 | 0 | 5 | 5 | 100 | 0 | 0 | 0 | – | 40 | – | 0 | 0 | -40 |
NO2 | -5 | 5 | -25 | -165 | 100 | 45 | – | -70 | – | – | 30 | 0 | -10 |
Cl2 | -10 | 0 | -20 | -25 | 10 | 100 | 60 | -20 | 6 | -20 | 0 | 0 | -50 |
ClO2 | – | – | – | – | 20 | 100 | – | – | – | – | – | – | – |
HCN | 15 | – | – | 50 | 1 | 0 | 0 | 100 | 35 | 1 | 0 | 30 | 5 |
HCl | 3 | – | – | 5 | 0 | 2 | 0 | 0 | 100 | 0 | 15 | 0 | 0 |
PH3 | – | – | – | – | – | – | -100 | 425 | 300 | 100 | – | – | – |
NO | 25 | 40 | -0.2 | 1 | 5 | – | – | -5 | – | – | 100 | 30 | 0 |
H2 | 22 | 3 | 0.08 | 0.5 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 100 | 0 |
NH3 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 100 |
The table above reflects the percentage response provided by the sensor (top row) when exposed to a known concentration of the target gas (column 1).
The numbers were measured under these environmental conditions: 20 °C (68 °F), 50% RH and 1 atm.
The specified cross-interference numbers apply to new sensors only and may vary with time as well as from sensor to sensor.
“-” means no data available.
This table is given as a reference only and is subject to change.