Vaisala HM45 User Manual

49
3. Select the number of
calibration points at menu item
[2] Points
. You can perform a 1-
point or 2-point calibration.
For a 2-point calibration, you
need two reference
environments. For example,
LiCl and NaCl salt chambers
provide 11% and 75% relative
humidity references.
Note that when performing a 2-
point RH calibration, the first point
requires a < 50% RH humidity
reference, and the second point
must be > 50% RH.
The difference between the two
references must be at least 30%
RH.
4. Remove the filter from the probe
and place the probe in the first
reference environment (first
calibration point).
Take care not to damage the
sensors. Wait 20 – 40 minutes for
the reading to stabilize.

Vaisala HM45 Specifications

General

Brand	Vaisala
Model	HM45
Category	Measuring Instruments
Language	English