Overview - DM70

DM70 User Guide

Document code
M010091EN
Revision
G
Language
English
Product
DM70
Document type
User guide

Sulfur hexafluoride (SF6) is an inert, insulating gas of high dielectric strength and thermal stability. SF6 is used to insulate high voltage lines, circuit breakers, and other equipment used in transmission and distribution of electricity. Measuring moisture is crucial for the maintenance of SF6 equipment.

The DMP74C probe has been optimized for measurements in SF6 gas. The measurement is recommended to be made in pressurized gas for better dew point accuracy. The sensor purge feature of the DRYCAP® 180M sensor allows a fast response in low dew points, and only a small amount of SF6 needs to be drained from the GIE (gas-insulated equipment).

SF6 is a greenhouse gas, with a global warming potential 24900 times that of CO2. For this reason, the gas should be recycled according to the local laws and regulations. The DSC74B sampling cell allows the gas to be collected after the measurement (see Figure 1). When measurement is done in the GIE pressure, the structure of DSC74B eliminates the adverse effect of pressure fluctuation caused by the collection system.

Figure 1. Gas collection option
1
Gas from GIE
2
Gas to the collecting system