1. Barriers intrinsically safe BI-2, BI-3, BI-4, BI-7 are designed as a separating device between electrical circuits explosive and non-explosive areas with explosion protection of the "intrinsically safe circuit" type.
  Barriers electrically isolate power circuits and interface (signal) circuits of converters or other digital devices, used as part of measuring complexes and systems, as well as as part of systems for monitoring and regulating technological processes in various industries where intrinsic safety of measuring devices is required.