These bottles should be mixed and formulated to NIST requirements, have an expiration date, and be clearly labeled with the concentration of the target gas and any other gases that are present in the bottle (i.e.

Finally the manufacturer’s instructions should be followed which includes the application of test gases, span and zero adjustments, and labeling that the unit has been properly calibrated.Ĭalibration gas is a bottle that contains a pressurized mixture of gases which are specific to the type of sensor being calibrated. Next the sensor should be inspected for damage. First you should read the manual and gather the correct span gas, zero gas, regulator, calibration cap, multimeter, and any specialized controller. Most occupational health and safety sensors should be calibrated every 3 months, and portable gas monitors are often calibrated every 30 days Often times, out technicians base the calibration frequency on the levels of exposure expected, such that areas where gas rarely leaks get calibrated annually and areas that lea often get calibrated every 30 or 90 days.Ĭalibrating a gas sensor requires knowing the brand, model, and type of sensors present. The absolute longest interval between calibration should be 12 months, which is standard for parking garage gas sensors. 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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