The H2S monitor detects hydrogen sulfide gas and alerts users with audible, visual, or vibration alarms if the concentration of hydrogen sulfide reaches a dangerous threshold. It helps keep workers safe when entering confined spaces where the presence of the toxic gas is hazardous.
H2S monitor is produced from decaying organic material in the environment and can be found in liquid manure, sulfur hot springs, and sewage. Inhaling H2S gas in high concentrations can cause a variety of health issues, including eye and nose irritation, headaches, loss of consciousness, and death.
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This article examines the performance of four low-cost H2S monitors during a simulated barn year. The monitors were exposed to a range of environmental conditions in a small chamber that replicated storage and use conditions in livestock production facilities. Before each chamber test, the monitors were challenged with 20 ppm of H2S calibration gas to ensure that they were functioning properly and could respond to both high and low alarms as designed. The monitors that displayed H2S concentration exhibited less sensor drift than the alarm-only models; however, both the Altair and BW Clip RT exhibited display and alarm failures. The BW Clip RT also showed longer response times for both the low and high alarms at the end of the simulated barn year, indicating that it was beginning to exhibit degradation in performance. This information supports the recommendation that all monitors be bump tested throughout their service life and periodically during field operations.
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