Guidelines & Tools Standard Operating Procedure Teledyne Model 640x Real-Time Continuous PM Monitor Published 2019 Share SHARE Facebook share Twitter LinkedIn Copy URL Email Download Download teledyne_api_t640x_sop_-_041219.pdf en Added on: 20 May, 2025 Breadcrumb Home Resource Library Standard Operating Procedure Teledyne Model 640x Real-Time Continuous PM Monitor The Standard Operating Procedure (SOP) for the Teledyne API Model T640 PM Mass Monitor was developed through a collaboration between Sonoma Technology, Inc., the EPA, and multiple monitoring agencies. It incorporates feedback from user experiences and various experts, with revisions influenced by a broad range of contributors. The document aims to aid agencies in effectively using the T640x monitors and welcomes ongoing feedback for further optimization.