Hanna Instruments HI 91610C - Manual (Page 13)

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• 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 overflow
from the container.
• Pour approximately 12 cc of distilled wa-
ter into the other chamber marked "RH
75.4%".
• Add all the content of the HI 7121
bottle (NaCl salts) while continuously shak-
ing the container to avoid the formation
of lumps. Seal this container well when
not in use.
The calibration kit needs 4 hours for proper
stabilization.
CALIBRATION PROCEDURE
• Bring the calibration kit to a temperature of approximately 20°C
(68°F) and keep it in an area minimum temperature variations.
• Remove the cap from the "RH 11.1%"
chamber and insert the probe, while
paying attention that it does not touch
the liquid.
• Remove the adhesive sticker that covers
the calibration trimmer access holes.
• Wait for the measurement to stabilize
(this takes approximately 4 hours).
• Press the ON/OFF (HI 9161) or RANGE
(HI 91610) key to switch the meter on.
• Press the RANGE key to display the RH%
reading on the primary LCD.
Li Cl
11.1%
Na Cl
75.4%
CALIBRATION KIT
Li Cl
11.1%
Na Cl
75.4%
CALIBRATION KIT
H
2 O
12cc
Na Cl
Li Cl
11.1%
Na Cl
75.4%
CALIBRATION KIT
12
3
6
9
4 h
CALIBRATION KIT
Li Cl
11.1%
Na Cl
75.4%
12
3
6
9
4 h
All HANNA thermo-hygrometers have been precalibrated at the
factory. HANNA instruments
® uses state-of-the-art thermally-isolated
humidity chambers for this purpose.
It is generally recommended to have all thermo-hygrometers recalibrated
at least once a year. For an accurate annual recalibration, contact
your dealer or the nearest HANNA Customer Service Center.
You can also check the calibration status of
your thermo-hygrometer and perform a quick
RH calibration (with an accuracy of ±5%)
by using the HANNA HI 7101 calibration
chamber.
The kit includes two thermally-isolated chambers, each one equipped
with a cap and three bottles containing the appropriate precalibrated
saturated salts to produce a known RH value.
PREPARING THE CALIBRATION SOLUTIONS
• Pour approximately 26 cc of distilled wa-
ter into a glass container.
• Immerse this container into a bath of ice
and water.
• Slowly add the contents of a HI 7111
bottle (LiCl salts) into the glass container
while stirring gently.
• When the salts have dissolved completely,
add all the content of the second bottle
of HI 7111.
• Allow the solution to cool, and pour it
into the chamber marked "RH11.1%",
making sure that no residue remains on
the walls of the glass container.
CALIBRATION
Li Cl
11.1%
Na Cl
75.4%
CALIBRATION KIT
H
2
O
26 cc
Li Cl
ON/OFF
RANGE