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NONitric Oxide


STEL: 2.5ppm (Short Term exposure Limit - 15Mins)

TWA: 2ppm (Time Weighted Average - 8hrs)


Alarm Recomendations
Rising Latching Alarms For Line Safety Applications

First Alarm: Second Alarm: Third Alarm:
2ppm 2.5ppm Optional

Nitric Oxide(NO2) Molecule, Nitric Oxide Detector/NO2 Detector

Nitric Oxide (NO)

Nitric Oxide (NO2), or nitrogen oxide also known as nitrogen monoxide, is a molecule with the chemical formula NO. At room temperature, Nitric Oxide is a colourless, nonflammable, poisonous, oxidising gas with an irritating odour. NO2 is extremely toxic by inhalation, and symptoms of over-exposure may not become apparent for up to 72 hours. The gas is an oxidiser and will support and enhance combustion. Nitric Oxide fumes may be encountered whenever nitric acid comes in contact with organic material such as wood, sawdust, or refuse. It can also result from heating nitric acid and when organic nitro compounds are burned, for example dynamite. The action of nitric acid upon metals, as in metal etching and pickling, also liberates this dangerous compound.

The Uses of NO:

Nitric Oxide is a free radical and is an important intermediate in the chemical industry. Nitric Oxide is a by-product of combustion of substances as in automobile engines, fossil fuel power plants. Although NO has relatively few direct uses, it is produced on a massive scale as an intermediate in the Ostwald process for the synthesis of nitric acid from ammonia. In 2005, the US alone produced 6 million metric tons of nitric acid. It finds use in the semiconductor industry for various processes. In one of its applications, it is used along with nitrous oxide to form oxynitride gates in CMOS devices.

Exposure to high concentrations of NO can cause pulmonary oedema and death. Exposure to low concentrations of fumes, insufficient to cause pulmonary oedema, are said to result in chronic irritation of the respiratory tract, headache, cough, loss of appetite, dyspepsia, corrosion of the teeth and gradual loss of strength.


IGD’s Nitric Oxide Detector Solutions:

IGD offer a wide range of NO Detector, including our latest 2-Wire™ Addressable Nitric Oxide Detector:

  • Addressable 2-Wire™ Safe Area NO Detector
  • Addressable 2-Wire™ ATEX Nitric Oxide Detector
  • Legacy 4-20mA Analogue Nitric Oxide Detector
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