Hanna Instruments HI 8564 - Manual (Page 6)

10 11
RH Calibration Procedure (HI 8564 only)
• Bring the calibration kit to a temperature of
approximately 20°C.
• Remove the cap from the
"RH 11.1%" chamber con-
taining the LiCl solution and
insert the probe paying at-
tention not to tip it into the
liquid.
• Remove the adhesive sticker which covers
the calibration trimmer access holes.
• Press the ON/OFF key to
switch the instrument on.
• Wait for the measurement to
stabilize (this takes about
4 hours).
• Turn the low humidity trimmer (see Func-
tional Description) until a value of 0.0% is
seen on the readout (reading between 0.0%
and 1.0% RH is also acceptable).
• Remove the probe and tightly seal the cham-
ber containing the LiCl solution.
CALIBRATION KIT
Li Cl
11.1%
Na Cl
75.4%
12
3
6
9
4 h
H
ON
OFF
• When the salt has dissolved
completely, add all the con-
tent of the second bottle of
HI 7111.
• Allow the solution obtained
to cool, and then pour it into
the chamber marked
"RH 11.1%", making sure
that no residue remains on
the walls of the glass con-
tainer.
• Seal the chamber well when not in use, as
the LiCl solution is extremely hygroscopic
and tends to capture the humidity present in
the air causing the solution to expand in
volume and to overflow from the container.
• Pour approximately 12 cc of
distilled water into the other
chamber marked "RH
75.4%".
• Add all the content of the
HI 7121 bottle containing
NaCl while continuously
shaking the container to
avoid the formation of lumps.
Seal this container well when
not in use.
The calibration kit needs
4 hours for stabilization.
12 cc
Li Cl
Li Cl
11.1%
Na Cl
75.4%
CALIBRATION KIT
Li Cl
11.1%
Na Cl
75.4%
CALIBRATION KIT
H
2 O
Na Cl
Li Cl
11.1%
Na Cl
75.4%
CALIBRATION KIT
12
3
6
9
4 h