Hanna Instruments HI 2300 - Manual (Page 25)

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All the instruments are factory calibrated for temperature.
Hanna’s temperature probes are interchangeable and no temperature
calibration is needed when they are replaced.
If the temperature measurements are inaccurate, temperature recalibration
should be performed.
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 (around 50 ºC). 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 appropiate
socket.
• With the instrument off, press and hold down CFM&SETUP keys
and then power on the instrument. The “ CAL” tag will appear and
the secondary LCD will show “ 0.0 ºC“.
• Submerse the EC probe in the vessel with ice and water as near as
possible to the calibrated 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 calibrated thermometer. When
the reading is stable and close to the selected calibration point, the
“
CFM” tag will blink.
• Press CFM to confirm. The secondary LCD will show “ 50.0 º C “ .
• Submerse the EC probe in the second vessel as near as possible to
the calibrated thermometer. Allow a few seconds for the probe to
stabilize.
TEMPERATURE CALIBRATION
(for technical personnel only)