Chapter 4
Replacing the Internal Filters
Replace the internal filters based on the schedule in Table 4–1 or when the
filter indicator on the main screen changes to red.
1. Turn the instrument off.
2. Remove old filters from the instrument.
Handheld Model
a. Use the enclosed filter removal tool (PN 801668) tool to unscrew the
two filter caps located on the bottom of the instrument.
b. Pull the old filters out of the two filter wells. If filter wells are visibly
dirty, blow out with compressed air.
Figure 4-5: Pull Filters Out of Two Filter Wells (Handheld Model)
c. Put two (2) new filters (P/N 801666) into the filter wells and screw
filter caps back into place.
Replacement filters were shipped with the new instrument. Order
additional filters from TSI under PN 801666.
Desktop Model
a. Open filter access door on the back of the instrument.
b. Use the enclosed filter removal tool (PN 801668) to unscrew
filter cap.
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