Vaisala HM40 - Manual (Page 42)

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Filters
Vaisala offers two types of filters for the HMP113 probe:
- Plastic grid filter is 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.
For instructions on how to replace the filter on the
HMP113 probe, see section Changing the Filter on
page 33.
Chargers and Batteries
You can order an external battery recharger with USB
connection and compatible NiMH rechargeable batteries
from Vaisala. For more information, see the following
sections of this manual:
- Batteries on page 9
- Charging on page 10
Belt Clips and Battery Covers
If you need a new belt clip or battery compartment cover,
you can order replacements from Vaisala.