Description
Nitric Oxide () is a colourless gas that is highly reactive and plays a significant role in both atmospheric chemistry and biological systems. While it is important for various bodily functions, at elevated concentrations in the air, it can be a health hazard, particularly as it readily reacts with oxygen to form nitrogen dioxide (), which is far more toxic.
Key Properties:
- Colourless: Invisible to the naked eye.
- Slightly Pungent/Sweet Odour: It has a faint odour that is not easily detectable, especially at hazardous concentrations. Its danger often lies in its rapid conversion to the reddish-brown, highly toxic gas, which has a sharp, biting odor.
- Highly Reactive: Readily reacts with oxygen in the air to form .
- Non-toxic (at very low levels, and plays a biological role): However, its rapid oxidation to means that exposure to almost always leads to exposure to , which is a potent respiratory irritant.
- Density: Roughly the same density as air, so it mixes relatively easily.
Replacement Sensor, Part No. 17124975-D, Properties
| Gas Detected (Abbreviation) |
Sensor Type | Measurement | Response time (Seconds) |
Calibration Gas & Concentration |
||
|---|---|---|---|---|---|---|
| Range | Resolution | T50 | T90 | |||
| Nitric Oxide NO |
Electrochemical | 0 to 1,000ppm | 1.0 ppm | 7 | 28 | NO 25 ppm |
Sensor may become unstable, if the battery is removed from the instrument or after the low battery warning is activated. If either incidence occurs, change the battery (or re-install the existing battery if it has suitable life remaining), then power the monitor ON then OFF, and allow at least 24 hours for the sensors to stabilise.
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.
As Nitric Oxide reacts rapidly with air to become Nitrogen Dioxide, it may be worth adding the NO2 cell to your MX6. This sensor can be found on the link below
