![background image](http://html1.mh-extra.com/html/hanna-instruments/hi-8666/hi-8666_instruction-manual_3674745009.webp)
7
CALIBRATION CHEKING PROCEDURE
All Hanna relative humidity transmitters have
been precalibrated at the factory.
Hanna Instruments uses state-of-the-art ther-
mal humidity chambers for this purpose.
It is generally recommended to have all RH
transmitter recalibrated at least once a year.
For an accurate annual recalibration, con-
tact your nearest Hanna Service Center.
You can also check the status of your HI 8666
by using the Hanna mini-calibration cham-
bers HI 7102.
The kit includes two thermally
isolated chambers, each one
equipped with a threaded cap
and three bottles containing
the appropriate precalibrated
saturated salts to produce a
known RH value.
This calibration checking procedure is writ-
ten to verify that the meter still meets the
electrical calibration specifications of the fac-
tory.
PREPARING THE CALIBRATION
SOLUTIONS
•
Pour approximately 26 cc
of distilled water into a
glass container.
•
Immerse this container into
a bath of ice and water
and shake briefly.
•
Slowly add the contents of
a HI 7111 bottle contain-
ing LiCl into the glass con-
tainer while continuing to
shake.
Li Cl
11.1%
Na Cl
75.4%
CALIBRATION KIT
H
2
O
26 cc
Li C
l