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The M484 is a severe mill duty magnetic sensor for installation in M485 and M685 SMARTach (I) encoders.  It features potted electronics, a diagnostic red/green LED and remote alarm contact.  For new installations, Avtron recommends AV485 and AV685 severe duty encoders.

http://www.nidec-avtron.com/encoders/family/severe-mill-duty/m484