Humidifying calibration gas has been shown to improve detector accuracy and reduce false alarms. Perma Pure’s Nafion tubing based BE Series has been specifically designed to achieve these results. This highly selective permeation tubing extracts moisture from the surrounding ambient environment to humidify the calibration gas to the required level for laboratory and scientific applications. The continuous moisture transfer properties of the BE series provide long-term performance and minimises service costs. The new BE series is available in a range of lengths supporting the most common flow requirements. The BE series can also be used as a gas dryer to dehumidify wet gas streams to near ambient level humidity.