MAGNETIC FIELD EXPOSURE INDICATOR Russian patent published in 2017 - IPC G01R11/24 

FIELD: instrument making.

SUBSTANCE: invention can be used for prevention and detection of improper use of meters, to indicate unauthorised magnetic field exposure on meters. Present invention consists in that indicator of magnetic field exposure includes: housing 100 (600, 700) with cavity 1010 (6010, 7010), open on one side, where on inner walls 1020 (6020, 7020) of housing 100 (600, 700) formed by said cavity there are support ribs 1030 (6030, 7030); lock 200 (300, 800), having on one of its sides located mainly flush with upper part of said cavity 1010 (6010, 7010) lock crossbar (2010, 3010, 8010), and on sides – fixation petals 2020 (3020, 8020) configured for interaction with said support ribs 1030 (6030, 7030) of housing 100 (600, 700) in order to prevent extraction of lock 200 (300, 800) from said cavity 1010 (6010, 7010) after locking; wherein housing 100 (600, 700) and lock 200 (300, 800) comprise aligned holes 1050 (6060, 7060) and 2040 (3040, 8030) for passing a flexible element, and lock 200 (300, 800) has slots to accommodate flexible element deformed during locking. Magnetic field exposure indicator also comprises at least one display element 2030 (3030, 6050, 7050) in form of magnetic strips arranged: either on at least one mainly flat side of lock 200 (300), and/or on at least one mainly flat side of housing 600 (700) inside said cavity 6010 (7010); wherein in all cases housing 100 (600, 700) is made from non-magnetically sensitive material and is transparent.

EFFECT: increased reliability of indicator of magnetic field exposure and providing protection against unauthorised opening, removal of immediate vicinity of controlled object or re-installation of magnetic field exposure indicator.

9 cl, 18 dwg