A typical dew point of pure SF6 is usually around −60 °C. The recommendations for the moisture limit of the equipment insulated with gas (GIE) vary between 70 ... 810 ppmv, which corresponds to −45 ... −22 °C Td/f in the atmospheric pressure, or −29 ... −3 °C Td/f in 5 barg pressure.
DM70 is able to measure the dew point directly in the GIE pressure (usually 3 ... 8 barg), or the gas can be sampled and measured in the atmospheric pressure. If there is a need to measure high-pressure gas (>10 bar), for example in the recycling bottle, a regulator should be used to drop the pressure before the measurement.
High-voltage equipment can locate either indoors or outdoors. The operational temperature range of DM70 is between −10 ... +60 °C.