An h2s monitor detects dangerous levels of hydrogen sulfide gas in confined spaces such as manholes, sewers and tanks. Hydrogen sulfide (H2S) is a colorless, toxic gas that has a pungent, foul odor and is produced in a number of industries including mining, oil and gas refining, tanning, paper processing, landfills and breweries. At high concentrations, hydrogen sulfide can disorient or even cause unconsciousness within minutes. It can also irritate the respiratory system and damage lungs and other organs, even at lower concentrations.
H2S monitors typically use an electrochemical sensor that converts the gas into a current output that can be read by a user-operated display. The sensor’s hydrophobic membrane allows gas to permeate through it to reach the sensor electrolyte, while excluding liquids. The sensor produces a current output that indicates the ppm level of H2S that it has detected. The monitor’s display then shows the user how much exposure to H2S is occurring.
A personal H2S detector can warn users of a hazardous situation by a combination of audible noise, visual LED lights and vibration alarm signals. They are often pre-set with low and high alarm levels that are well below lethal concentrations according to the latest Occupational Safety and Health Administration (OSHA) regulations.
Most personal single-gas monitors are portable and designed to be worn close to the workers’ skin, in their breathing zone. They can be clipped to the worker’s hard hat, lapel or collar, and they should be kept away from any equipment that might obstruct it. It’s also important to ensure that the sensor on the monitor is not obstructed or covered by dirt and debris, as this can lead to inaccurate readings.
In addition to detecting high and low levels of H2S, many personal single-gas monitors store data for a month or more in memory. This can be retrieved from the device with a docking station or infrared adapter. It can then be used to help identify trends and make changes that improve worker safety.
When selecting a H2S detector, look for a model that’s easy to use and maintain. A handheld portable model should be simple to turn on and off and shouldn’t require a lot of maintenance. It should be rugged enough to withstand a drop or other environmental conditions. It should be water resistant and compatible with a range of accessories including a carrying case and a docking station. It should also be ATEX certified for use in potentially explosive environments.