Hanna Instruments HI 8564 - Manual (Page 5)

8 9
CALIBRATION
All HANNA hygrometers have been
precalibrated at the factory.
HANNA instruments
® uses state-of-the-art
thermal humidity chambers for this purpose.
It is generally recommended to have all hy-
grometers recalibrated at least once a year.
For an accurate annual recalibration, contact
your nearest Hanna Service Center.
You can also check the status of your HI 8564
and perform a quick recalibration (with an
accuracy of ±5%) by using the Hanna mini-
calibration chambers HI 7101.
The kits are composed of 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.
Preparing the Calibration Solutions (HI 8564
only)
• 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 containing
LiCl into the glass container
while continuing to shake.
Li Cl
11.1%
Na Cl
75.4%
CALIBRATION KIT
H
2
O
26 cc
Li Cl
OPERATIONAL GUIDE
INITIAL PREPARATION
Each meter is supplied complete with a 9V
battery. Slide off the battery compartment
cover on the back of the meter (see "Battery
Replacement" section), unwrap the battery and
install it.
To prepare HI 8564 for use, connect the RH
probe to the DIN socket on the top of the meter.
Turn the meter on by pressing the ON/OFF
button.
RELATIVE HUMIDITY MEASUREMENTS
• The end of the humidity detector should be
exposed to a current of air moving at 0.5 m
(20") per second or more.
• In the absence of air movement, the response
can be accelerated by moving the probe.
• The probe sensor must never come into
contact with water or other liquids.
If this happens, or if condensation causes
drops to form on the surface of the humidity
sensor, turn the instrument off and wait until
the liquid has evaporated completely. In order
to accelerate the evaporation process, ex-
pose the humidity sensor to a current of air.
For HI 93640 only: for a faster response,
remove the sintered cap. Whenever the probe
is to be used in a dusty or smoky environ-
ment, the cap must be kept on at all times.
TEMPERATURE MEASUREMENTS
Simply press the °C or °F keys to display the
temperature reading.
When measuring temperature in degrees Cen-
tigrade, "°C" is displayed.
For any problem in taking measurements, please
contact the nearest HANNA Customer Service
Department.