?:definition
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Recorders designed to record some physical, chemical, or other conditions and elements in the environment (e.g., particulates) to which individuals may be exposed; environmental recorders are intended for data examination after the events have occurred. Environmental recorders usually consist of an electromechanical or electronic device that includes amplifiers, data processors, and a memory (e.g., electronic, optical, chart) to store the information. Some recorders may include a display and/or integral printers; other recorders provide output to computers for analysis of the recorded information employing dedicated software. Environmental recorders are used mainly to determine the presence of the concentrations of gases (e.g., oxygen, carbon dioxide); some dedicated recorders are used to store information regarding the presence of hazardous substances (e.g., toxic gases, chemical and biological agents) and/or other abnormal physical conditions in the environment (e.g., high or low temperatures, ionizing radiation. Some environmental recorders warn of a hazardous condition when predetermined substance concentrations have been reached or exceeded.
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