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Instruction Manual
IM-105-4000, Original Issue
August 2005
OPM 4000
6-4
Filter Certification
QA/QC testing by Rosemount Analytical of the filters at an interval of not more
than 6 months is recommended. Filter certification, replacement, or additional
neutral density filters are available from Rosemount Analytical.
Rosemount Analytical neutral density filters for Micro-turn 200 are calibrated
on a Perkin-Elmer Lambda Series 6 / PECSS Spectrophotometer per Federal
Environmental Protection Agency specifications. These specifications are
contained in the Code of Federal Regulations 40 CFR 60, Appendix B,
Performance Specification 1, Attenuator Calibration. The filters are scanned
over the visible region from 380 to 780 nanometers in one nanometer step
and the resulting transmittances of the filter are weighted to the Source C
Human Eye Response by multiplying each value by its associated response
factor. The corrected values of transmittance are converted to % opacity and
the value is recorded on the filter and associated chart.