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ETTINGS
4-4 O
PERATING
G
UIDE
, TEOM 1405
T
HERMO
F
ISHER
S
CIENTIFIC
•
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 filter for the
flow line (Section 5) and replace it, if necessary.
Содержание TEOM 1405
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