Hanna Instruments pH 210 - Manual (Page 8)

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TEMPERATURE CALIBRATION TEMPERATURE CALIBRATION TEMPERATURE CALIBRATION TEMPERATURE CALIBRATION TEMPERATURE CALIBRATION
(((((for technical personnel only for technical personnel only for technical personnel only for technical personnel only for technical personnel only)))))
C C
C C
CFM
CAL
C
CAL
C
CFM
All the instruments are factory calibrated for temperature.
Hanna’s temperature probes are interchangeable and no tempera-
ture 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 ºC). 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.
• With the instrument off, press and hold down the CAL&MEM
keys, then power on the instrument. The “CAL” tag will appear
and the secondary LCD will show 0.0 ºC.
• 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 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 º C.
• Immerse the temperature probe in the second vessel 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 the hot water.
• 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 instrument returns
to measurement mode.
Note: If the reading is not close to the selected
calibration point, “WRONG” tag will blink.
Change the temperature probe and restart
calibration.