![]() ![]() Gas detectors should be calibrated at least as frequency as the manufacturer recommends, or more frequently based on use. How often should gas detectors be calibrated? Knowing the difference between an air calibration and zero calibration is vital to proper calibration and accuracy of these sensors. Some CO2 sensors may allow for a zero calibration that is actually at normal outdoor air levels of 350-400 ppm carbon dioxide, while others require the use of nitrogen gas with no CO2 present. How do you calibrate a CO2 sensor?Ĭalibrating a CO2 sensor requires span gas ( a bottle with a very specific concentration of carbon dioxide) and zero gas (a bottle with no carbon dioxide). The improper calibration of a gas detector can result in false alarms or a failure to alarm when a hazard is present. ![]() This calibration should always be performed by a competent technician that follows the manufacturer’s instructions properly. Many sensors also require the use of zero gas to adjust the voltage that is being output when the target gas is not present in the air. It is the act of exposing a sensor to the target gas in a specific concentration, and then adjusting the detector to read that gas concentration properly. Gas detector calibration is a requirement for all gas sensors. Frequently Asked Questions: What is Gas Detector Calibration? ![]()
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