Hanna Instruments HI 98180 - Manual (Page 49)

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m m m m mV V V V V and and and and and TEMPERATURE CALIBRATION TEMPERATURE CALIBRATION TEMPERATURE CALIBRATION TEMPERATURE CALIBRATION TEMPERATURE CALIBRATION
(for technical personnel only)
All the instruments are factory calibrated for mV and temperature.
Hanna’s temperature probes are interchangeable and no temperature
calibration is needed when they are replaced.
If the temperature or ORP measurements are inaccurate, calibration should
be performed.
For an accurate recalibration, contact your dealer or the nearest Hanna
Customer Service Center, or follow the instructions below.
ENTER CALIBRATION MODE
With the instrument off, press and hold down the / then power on the
instrument. The calibration screen is displayed. Press “T” functional key to
enter the temperature calibration mode.
TEMPERATURE CALIBRATION
• 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 temperature probe to the appropriate socket.
• Immerse the temperature probe or the pH probe including temperature
sensor 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 calibration point value to that of ice and
water mixture, measured by the reference thermometer. When the read-
ing is stable and close to the selected calibration point, the
CFM functional
key is displayed.