The Protech by Hirsch SDI-77XL2-EX-MEA-IND is the indoor-specific Main Electronic Assembly (MEA) replacement module for the PIRAMID EX explosion-proof motion detection platform. Designed as a direct drop-in replacement, this MEA delivers the same 100 ft. x 40 ft. (30 m x 12 m) Stereo Doppler microwave detection coverage without requiring replacement of the existing explosion-proof housing or mounting hardware — significantly reducing maintenance time and cost. Purpose-built for indoor hazardous environments, the MEA-IND features higher movement sensitivity software optimized for enclosed spaces and an optional PCB for fluorescent light noise filtering, ensuring reliable detection in warehouses, processing facilities, and storage areas. Certified for Class I Div. 1 & 2 (Groups C, D), Class II Div. 1 & 2 (Groups E, F, G), Class III, and NEMA 4, 7BCD, 9EFG classifications, and approved by the USAF for Protection Level 1 Nuclear & Below. Powered by a flexible 10.5 to 28 VDC input with just 1.1W consumption, this MEA is the ideal service replacement for maintaining uninterrupted intrusion detection at petroleum refineries, chemical plants, and other critical indoor hazardous locations.