Hanna Instruments HI 84429 - Manual (Page 38)

38
TEMPERATURE CALIBRATION PROCEDURE
(for technical personnel only)
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 bellow.
• Prepare a vessel containing ice and water and another one containing hot water (at a
temperature of around 50 °C). Place insulation material around the vessels to minimize
temperature changes.
• Use a calibrated thermometer with a resolution of 0.1 °C as a reference.
• To enter user calibration screen press and hold down the ARROW keys simultaneously, then
power on the instrument. After a few seconds the User calibration screen is displayed.
• Press Temp function key to enter temperature calibration.
• Immerse the temperature probe in the vessel with ice and water as near as possible to the
reference thermometer. Allow a few seconds for the probe to stabilize.
• Use the ARROW keys to set the calibration point value to that of the ice and water measured
by the reference thermometer.
• The (unstable measurement) symbol will be shown on the display until the reading
becomes stable.
• When the reading is stable and close to the selected calibration point, the (unstable
measurement) symbol will disappear and the CFM key will become active.
• Press CFM to confirm the calibration point.
• The meter will be automatically move to the second calibration point, and will display 50 °C
for the buffer value.