User’s Guide ________________________________________________ HM40
39
Filters
Vaisala offers two types of filters for HMP110 for use
with the HM40:
-
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
µ
m 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 HMP110 probe, see page 26.
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:
-
-
Belt Clips and Battery Covers
If you need a new belt clip or battery compartment
cover, you can order replacements from Vaisala.
