![]() The higher the concentration, the faster the alarm will respond. When the sensor detects dangerous levels of the gas, it sends an electronic pulse to the alarm. In the United States, sensors for home use are calibrated to detect CO concentrations according to Underwriters Laboratories (UL) safety standards. The CO sensor identifies and measures CO gas concentration in the atmosphere in parts per million (ppm).A detection chamber houses the CO gas sensor.A test/reset button lets you make sure the alarm is working.Wires to the building's electrical system or a battery provide power to the unit. ![]() Some detectors also have a liquid crystal display ( LCD) panel that shows a readout of CO levels.
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