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IMPORTANT NOTE: This calibration procedure requires the use of a voltage simulator and a digital
volt meter. The digital volt meter should be certified for accuray.
For factory calibration contact your Hanna Instruments office.
All the instruments are factory calibrated for mV and temperature.
Hanna Instruments's temperature sensors are interchangeable and no temperature calibration is
needed when they are replaced.
If the temperature is inaccurate, calibration should be performed.
For an accurate recalibration, contact your local Hanna Instruments Office or follow the instructions
below.
ENTER CALIBRATION MODE
With the instrument off, press and hold down the
tion screen is displayed. Highlight "T" and then press Modify to enter in the temperature calibration
mode.
TEMPERATURE CALIBRATION
• Prepare a vessel containing ice and water and another one containing hot water (at approximately
50 °C or 122 °F). Place insulation material around the vessels to minimize temperature changes.
• Use a calibrated thermometer with a resolution of 0.1 °C as a reference thermometer.
• Immerse 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
/ keys to set the calibration point value to that of ice and water mixture, measured
by the reference thermometer. When the reading is stable and within range of the selected
calibration point, the CFM functional key is displayed.
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/ then power on the instrument. The calibra‑
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