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Vaisala HM45 User Manual

Vaisala HM45
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54
Filters
HM41 & HM45 (HMP113 probe)
Plastic grid filter
The standard choice. It provides the fastest
response time, as air can flow freely around the
sensors.
Plastic grid with
membrane filter
Has a membrane under the plastic grid (0.2 µm
pore size) for additional protection against
contaminants. It slows down the response time
of the probe.
HM42
Steel grid filter with
membrane tube
The standard choice. The membrane should be
changed periodically and when it is getting
dirty.
HM46
Sintered filter
The standard choice. It has the same
temperature tolerance as the probe itself.
Plastic grid filter
Provides a faster response time than the
sintered filter but it has a more limited
temperature tolerance. This filter is only
recommended for non-demanding applications.
Membrane filter
Provides a faster response time than the
sintered filter but it has a more limited
temperature tolerance. The membrane under
the plastic grid provides additional protection
against contaminants compared to using only
the plastic grid filter.
For instructions on replacing a filter, see section
Changing the Filter on page 45.

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Vaisala HM45 Specifications

General IconGeneral
BrandVaisala
ModelHM45
CategoryMeasuring Instruments
LanguageEnglish

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