Download Report 2 - CSA Group

S ECTION 4
SCREENS AND SETTINGS
•
Filter loading: This field contains the filter loading percentage (Section 5).
It indicates the portion of the TEOM filter’s total capacity that has been
used. The instrument will always show a nonzero value even if no filter is
mounted in the mass transducer. New filters generally exhibit filter loading
percentages of 15% to 30% at a flow rate of 3 l/min, and less at lower flow
rates. TEOM filter cartridges must be exchanged before this value reaches
100% to ensure the validity of the data generated by the instrument. At
some point above 100%, the main flow drops below its set point. If the
filter loading percentage is higher than 30% when a new TEOM filter is
placed on the mass transducer, or if the lifetime of consecutive TEOM
filter cartridges becomes noticeably shorter, inspect the in-line filters for
the PM-2.5 and coarse flow lines (Section 5) and replace them, if
necessary.
In addition to the information indicated above, the instrument may be
configured to calculate equivalent MC values for the U.S. EPA or other
agencies. For U.S. EPA PM-2.5 reporting, this configuration must be
selected and data recorded. Refer to Section 4 for instructions to configure
this setting. If this configuration is not selected, this column will not appear
on the display.
4-4 OPERATING GUIDE, TEOM 1405-DF
THERMO FISHER SCIENTIFIC