DLCO tracer gas drift often occurs when the analyser hasn’t reached its internal operating temperature of 37 degrees Celsius. We suggest a warm-up period of 30 minutes to stabilise the infrared sensors before you begin testing. If the drift exceeds 0.5% per hour, check your Nafion tubing for moisture buildup. We’ve found that 90% of drift issues are resolved by replacing saturated drying agents or filters.