Reduction of the photometer sample flow to a level outside the tolerance limits, while using the internal reference settings for the 100% baseline response, results in a moderate increase in displayed % Leakage value. This higher value is the result of velocity changes of the aerosol passing through the light scattering chamber’s area of observation. The reduced velocity results in a more conservative evaluation of the filter under test. If actual upstream aerosol samples are used to establish a 100% baseline response (ratiometric mode), the unit’s aerosol response is self-correcting for the decreased flow rate and standard accuracy conditions maintained.
Articles in this section
- Effect of LSC Straylight Photometer Operation
- Sample Flow Effect on Photometric Response
- Aerosol Photometer Sample Flow Less Than 28.3 lpm
- Digital Aerosol Photometer Internal Reference
- Unstable Photometer Display
- TDA-2G Digital Photometer Data Acquisition
- 2H Digital Photometer Data Acquisition
- 2i Digital Photometer Data Acquisition
- What is the Correct Amount of Aerosol Concentration Needed to Accurately Evaluate and Test HEPA Filters?
- Aerosol Photometer Recalibration Interval