EMH Explosionproof Instrument Enclosures
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EMH Explosionproof Instrument Enclosures

Crouse-Hinds series EMH explosionproof instrument housings are used to enclose 2-1/2" or 3-1/2" diameter round, flush rim mounting meters, whose scale or dial would be visible in the 2-5/8" diameter glass window.

EMH instrument housings are certified for use in Class I, Division 1 and Class II, Division 1 areas.  They are commonly used in oil refineries, chemical plants, paint and varnish manufacturing plants, coal processing locations, grain processing plants and other industries with explosive gases or dusts.

Certifications and compliances


  • Class I, Divisions 1 & 2, Group D
  • Class II, Division 1, Groups E, F, G
  • Class II, Division 2, Groups F, G
  • Class III 
  • NEMA/EEMAC: 3, 7D, 9EFG, 12
  • UL Standard: 1203
  • CSA Standard: C22.2 No. 30

Design features

  • Sight glass in cover permits viewing of instrument dial or setting
  • Enclosures are non-magnetic, available in surface mounting and flush panel mounting; the cylindrical extension of the cover opening on the flush bodies will project through a hole in panel; thickness of panel must not exceed 1/4" to ensure flametight assembly of cover threads with body threads
  • Mounting plates and posts in bodies support the instrument close to the heavy glass window in cover; maximum depth of instrument extending from outboard end of posts toward the back wall of enclosure body is 3"; there is ample wiring space in back of instruments
  • Bodies have bosses on all four sides and back for drilling and tapping of conduit entrances
  • Dead end and through feed arrangements for 3/4" rigid conduit are standard listings

Standard materials

  • Bodies and covers – copper-free aluminum
  • Windows – heat strengthened plate glass