Online monitoring of SF6 is convenient with Vaisala’s Multiparameter Transmitter DPT145. The DPT145 is a unique innovation that not only monitors dewpoint online but also pressure and temperature. In addition, the instrument calculates four other values, including gas density and ppm. The DPT145 provides an excellent assessment of the SF6 insulation. Both sudden and minor leaks are detected by the direct normalized pressure measurement, while online dew point measurement alerts the user to moisture issues, which can weaken the insulation properties of SF6 and cause rapid deterioration. Integrating the DPT145 into a condition-based monitoring system minimizes the need for on-site visits and helps to ensure that no SF6 is released into the atmosphere.