Duration of Testing for Atmosphere
For each test required on the permit, you must allow enough time for the air from the space to be drawn into the equipment and for the sensor (or other detection device) to react to the chemical if it is present. This is considered the “minimum response time” and it will be noted by the manufacturer in the operator’s manual. Be aware that you will need to add time to this “minimum response time” if you have attached hosing or a probe extension to the inlet. The additional time is needed to allow the air from the different depths of the space to be pulled into the equipment inlet.