19
Notes: • The “OLd” message displayed beside the pH value means
that this buffer was not used during last calibration. Press
and hold down SETUP if you want to see calibration date (or
time, if old calibration was performed on the same day as the
current calibration).
• For each custom buffer used in calibration, the “BUFFER
pH” tag will blink.
• If “no bUF” message appears on the LCD, the instrument
informs you that the calibration was performed with less than
five buffers.
• Calibration Expiration status:
- if disabled.
- or the number of days until the calibration alarm will be displayed.
- or if expired (7 days ago).
• The instrument ID.
Notes: • Press GLP to return to measurement mode.
• If calibration has not been performed, the instrument
displays “no CAL” message blinking.
30
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 0.1ºC as a reference
thermometer.
• With the instrument off, press and hold down the CFM & SETUP
keys, then power on the instrument. The “CAL” tag will appear and
the secondary LCD will show “0.0 ºC“.
• Submerse 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 reading on the secondary LCD to that
of ice and water, measured by the reference thermometer. When the
reading is stable and close to the selected calibration point, “READY”
tag will appear and “CFM” tag will blink.
• Press CFM to confirm. The secondary LCD will show “50.0 ºC“.
• Submerse the temperature probe in the second vessel as near as
possible to the reference thermometer. Allow a few seconds for the
probe to stabilize.
TEMPERATURE CALIBRATION
(for technical personnel only)
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