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mV & TEMPERA
TURE CALIBRA
TION (for technical personnel only)
14. mV & TEMPERATURE CALIBRATION (for technical personnel only)
All instruments are factory calibrated. Calibration is only required if the temperature or mV
measurements are inaccurate.
Recalibration should only be performed by technical personnel. Contact your local Hanna Instruments
Office or follow the instructions below to recalibrate the instrument.
To enter technical calibration, turn the meter off, press and hold the / keys and press the
ON/OFF
key. The technical calibration screen is displayed.
Use the / keys to select temperature or mV. Press
Modify
to calibrate the selected option.
14.1. TEMPERATURE CALIBRATION
• Prepare two vessels, one with ice and water and the second with hot water (at approximately 50 °C
or 122 °F). Insulate the vessels to minimize temperature changes.
• Immerse the pH probe and a reference thermometer with 0.1 °C resolution into the vessel containing
ice and water. The pH probe and the reference thermometer should be as close as possible. Allow
a few seconds for the probe to stabilize.
• Use the / keys to set the calibration point value, measured by the reference thermometer. After
the reading has stabilized and is within the range of the calibration point, press
CFM
to update
the calibration point.
• The second expected calibrated point is displayed.
• Immerse the pH probe, and reference thermometer with 0.1 °C resolution into the vessel containing
hot water. The pH probe and the reference thermometer should be as close as possible. Allow a few
seconds for the probe to stabilize.
