EXPLOSION PROTECTION METHOD OF IN-TUBE MONITORING DEVICE, AND ARRANGEMENT OF EXPLOSION PROTECTION SYSTEM FOR ITS IMPLEMENTATION Russian patent published in 2013 - IPC F17D5/00 

FIELD: machine building.

SUBSTANCE: electric feed circuits of an instrument module of the device are connected to a power supply at the pressure ensuring absence of explosive gas mixture from the launching chamber, and electric feed circuits of the instrument module are disconnected from the power supply at reduction of pressure in the receiving chamber to the pressure ensuring absence of explosive gas mixture from the receiving chamber. The device provides activation and deactivation of electric feed circuits of the instrument module at the pressure ensuring absence of explosive gas mixture from the launching (receiving) chamber, as well as allows, by means of reception of a signal of a low-frequency electromagnetic transmitter arranged on the device, monitoring of standard operating modes performed by the device.

EFFECT: improving explosion protection efficiency of the device for in-tube monitoring at performance of flaw detection of main gas lines.

5 cl, 1 dwg