Mobile roof sunwrt (MRS) machines are used as roof .. . . ~ ~~~ suppiirt during pillar rccovery in retreat operations in lieu of wooden posts, cribs, or hydraulic props. A Mine Safely and Hrdlth Administmtion-perniissihle load rate monituring sydrm was developed fnr the hlRS by researchers at the Spokane Research Laboratnry of the Satiunnl Institute for Occupational Safety and Hedth. The system uses a dedicated embedded processor to monitor changes in pressure inside the hydraulic cylinders of the hIRS through multiplexed data acquisition channels and converts these pressure changes to load rntcs Lhdt xquentid~y activate three load-rate-indicator lighh mounted on the mchinc. Each light represents a different luading rate to alert mine personnel t u dangerous ronditiuns during pillar rxtraction.

JElectronics technician.

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