Most widely used for monitoring green energy resources around the world for more than 80 years



The electric power industry uses SF6 to insulate switch gears, circuit breakers and other equipment used in electricity transmission and distribution. To ensure the integrity of SF6 gas as an insulator, the amount of water vapor in SF6 gas should be kept to a minimum. Moisture may also increase the formation of unwanted secondary decomposition products, which can lead to arcing and equipment failure.

Online assessment of SF6 gas insulated equipment is made easier with the Vaisala DPT145. This simple transmitter pro probe is easy to retrofit on existing SF6 equipment (adapters are available). Or it can be ordered with the new HV equipment.

The unit gives the key 7 parameters of SF6 gas quality and maintenance important factors such as:

SF6 leakage (even micro leakages are early detected with the stabile SF6 pressure measuring, which saves outages and SF6 from being released into the atmosphere)

SF6 quality by measuring dew point (SF6 Moisture problems are now easy to address and it is possible to prevent SF6 degradation in an early stage with the built-in precise dew point measurement)

Additionally, DPT 145 precisely measures temperature and gives information on SF6 density and dew point in atmospheric pressure.

The signals can be connected to Scada by Modbus over RS485.

Vaisala DPT 145 is the latest summary of Vaisala’s 70 years extensive measurement experience, knowledge and innovation in pressure and dew point sensors DRYCAP and BAROCAP sensor technology.



The DPT145 is a unique innovation that not only monitors dew point 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. Read more in the datasheet below…