Description
Carbon Monoxide (CO) gas is a colourless, odourless, tasteless, and non-irritating gas that is highly toxic. It’s often referred to as the “silent killer” because it’s impossible to detect with human senses, and its presence can lead to severe health effects or death without warning.
Key Properties
- Colourless, Odourless, Tasteless: Undetectable by human senses
- Highly Toxic: Interferes with the blood’s ability to carry oxygen
- Slightly Lighter Than Air: It mixes readily with air, but can still accumulate in enclosed spaces if not properly ventilated
- Flammable: Can ignite and form explosive mixtures in high concentrations
Hydrogen Sulphide (H2S) gas is often referred to as sewer gas, stink damp, or sour gas, is a colourless, highly toxic, flammable gas. It’s well-known for its characteristic rotten egg smell, though it’s important to note that at higher concentrations, H2S rapidly deadens the sense of smell, making it an unreliable indicator of its presence. It is produced naturally through the anaerobic decomposition of organic matter (without oxygen) by bacteria. It’s also a by product of various industrial processes. Therefore, it can be found in numerous settings where people work or are present.
Key Properties
- Colourless: Invisible to the naked eye
- Highly Toxic: Even at low concentrations, it can be fatal
- Flammable/Explosive: Can ignite and form explosive mixtures with air
- Heavier than Air: Tends to accumulate in low-lying areas, confined spaces, and trenches
Replacement Sensor, Part No. 17124975-J, Properties
Gas Detected (Abbreviation) |
Sensor Type | Measurement | Response time (Seconds) |
Calibration Gas & Concentration |
||
---|---|---|---|---|---|---|
Range | Resolution | T50 | T90 | |||
Carbon Monoxide CO |
Electrochemical | 0 to 1,500 ppm | 1.0 ppm | 15 | 40 | CO 100 ppm |
Hydrogen Sulphide H2S |
0 to 500 ppm | 0.10 ppm | 12 | 30 | H2S 25 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.
Single gas cells for CO and H2S are also available for the MX6 gas detector and these sensor can be found on the link below