H2d monitors detect hydrogen sulfide, also known as sewer gas or swamp gas because of its rotten smell. This colorless gas is generated by breweries, paper processing, tanning and landfills. It is also found in confined spaces such as manholes, pits and ducts because it is heavier than air and sinks to the bottom of these enclosures. It is one of the leading causes of workplace fatalities from inhalation. Check this out

When workers enter a confined space, they should wear a personal H2S monitor that clips to their clothing. These monitors have electrochemical sensors that go off when they hit a specific threshold of H2S in the air, called an alarm set point and/or emergency reporting threshold that can be adjusted.

The Power of H2S Detection: How H2S Monitors Ensure Safety in Hazardous Environments

If the alarm goes off, it alerts the team to high levels of hazard gas and they should evacuate the area or take additional action such as using ventilation, wearing respirators or changing into new clothes. They should also bump test their device by exposing it to a concentration of 25 ppm of H2S for at least a minute to ensure the sensor works properly.