Hanna Instruments HI 98360 - Manual (Page 22)

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For an accurate recalibration, contact your dealer or the nearest Hanna
Customer Service Center, or follow the instructions below.
• Prepare a vessel containing ice and water and another one containing
hot water (at approximately 50 ºC or 122 ºF). Place insulation
material around the vessels to minimize temperature changes.
• Use a calibrated thermometer with a resolution of 0.1 ºC as a
reference thermometer. Connect the EC probe to the appropriate
socket.
• With the instrument off, press and hold down the Range & keys,
then power on the instrument. The “ CALIBRATION” tag will
appear and the secondary LCD will show “ 0.0 ºC”. The primary LCD
will display the measured temperature or the ” ----” message, if the
measured temperature is out of range.
• Submerse the temperature probe into the vessel with ice and water
as close as possible to the reference thermometer. Allow a few seconds
for the probe to stabilize.
• Use the ARROW keys to set the reading on the secondary LCD to that
of ice and water, measured by the reference thermometer. When the
reading is stable and close to the selected calibration point, “
CFM”
tag will blink.
• Press CFM to confirm. The secondary LCD will
display “ 50.0 ºC”.
• Submerse the temperature probe into the second vessel as close as
possible to the reference thermometer. Allow a few seconds for the
probe to stabilize.
• Use the ARROW keys to set the reading on the secondary LCD to that
of the hot water.
• When the reading is stable and close to the selected calibration
point, “ CFM” tag will blink.
• Press CFM to confirm. The instrument returns
to measurement mode.
Note: If the reading is not close to the selected calibration point,
“ WRONG” tag will blink. Change the temperature probe and
restart calibration.