ASTM D7520-09
Standard Test Method for Determining the Opacity of a Plume in the Outdoor Ambient Atmosphere
- Standard No.
- ASTM D7520-09
- Release Date
- 2009
- Published By
- American Society for Testing and Materials (ASTM)
- Status
- Replace By
- ASTM D7520-13
- Latest
- ASTM D7520-16(2023)
- Scope
Air permits from regulatory agencies often require measurements of opacity from stationary air pollution point sources in the outdoor ambient environment. Opacity has been visually measured by certified smoke readers in accordance with USEPA (USEPA Method 9). DCOT is also a method to determine plume opacity in the outdoor ambient environment.
The concept of DCOT was based on previous method development using Digital Still Cameras and field testing of those methods. , The purpose of this standard is to set a minimum level of performance for products that use DCOT to determine plume opacity in ambient environments.
1.1 This test method describes the procedures to determine the opacity of a plume. The aforementioned plume is caused by particulate matter emitted from a stationary point source in the outdoor ambient environment using digital imagery and associated software and hardware.
1.2 The opacity of emissions is determined by the application of a Digital Camera Opacity Technique (DCOT) that consists of a Digital Still Camera, Analysis Software, and the Output Function’s content to obtain and interpret digital images to determine and report plume opacity.
1.3 This method is suitable to determine the opacity of plumes from zero (0) percent to one hundred (100) percent.
1.4 This test method is not applicable to stacks with internal diameters greater than 7.0 ft.
1.5 Conditions that shall be considered when using this method to obtain the digital image of the plume include the plume’s background, the existence of condensed water in the plume, orientation of the Digital Still Camera to the plume and the sun (see Section 8).
1.6 This standard describes the procedures to certify the DCOT, hardware, software, and method to determine the opacity of the plumes.
1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
ASTM D7520-09 Referenced Document
- ASTM D1356 Standard Terminology Relating to Sampling and Analysis of Atmospheres*， 2024-04-19 Update
- ASTM E691 Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
- IEEE 12207-2008 Systems and software engineering - Software life cycle processes
ASTM D7520-09 history
- 2023 ASTM D7520-16(2023) Standard Test Method for Determining the Opacity of a Plume in the Outdoor Ambient Atmosphere
- 2016 ASTM D7520-16 Standard Test Method for Determining the Opacity of a Plume in the Outdoor Ambient Atmosphere
- 2013 ASTM D7520-13 Standard Test Method for Determining the Opacity of a Plume in the Outdoor Ambient Atmosphere
- 2009 ASTM D7520-09 Standard Test Method for Determining the Opacity of a Plume in the Outdoor Ambient Atmosphere
