Filter Loading; Teom Filter Replacement - Thermo Scientific TEOM 1405 Manual

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ECTION ECTION ECTION
ECTION ECTION
M C P
AINTENANCE AND ALIBRATION ROCEDURES
TEOM Filter TEOM Filter
TEOM Filter TEOM Filter TEOM Filter
Replacement Replacement
Replacement Replacement Replacement

Filter Loading

Filter Loading Filter Loading
Filter Loading Filter Loading
TEOM Data screen.
5-4 O G , TEOM 1405
PERATING UIDE
The Series 1405 TEOM filter needs to be changed periodically before filter
loading can affect the flow, or at least every 30 days.
Note. Note.
Note. Note. Change the filter at least every 30 days. Note.
The filter loading percentage value indicates the percentage of the TEOM
filter's total capacity that has been used. You can check the TEOM filter
loading percentage on the monitor's TEOM Data screen (Figure 5-4).
Because this value is determined by the pressure drop of the main sample
flow line, the instrument always shows a non-zero value even if no TEOM
filter is mounted in the mass transducer. New TEOM filters generally
exhibit filter loading percentages of 15% to 30% at a main flow rate of 3 l/
min, and less at lower flow rates.
Figure 5-4. Figure 5-4. Figure 5-4. Figure 5-4. Figure 5-4.
TEOM filters must be replaced before the filter loading percentage reaches
100% to ensure the quality 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% (at a main flow rate of 3
l/min) when a new TEOM filter is placed on the mass transducer, or if the
lifetime of consecutive TEOM filters becomes noticeably shorter, you may
need to replace the in-line filter. Refer to "Exchanging the In-Line Filters"
later in this section.
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HERMO ISHER CIENTIFIC