Hanna Instruments HI 98170 - Manual (Page 30)

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TEMPERATURE CALIBRATION
(for technical personnel only)
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 (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 HI 7662 temperature probe to the appropriate
socket.
• With the instrument off, press and hold down the SETUP & keys,
then power on the instrument. The “CAL” tag will appear and the
secondary LCD will show 0.0 ºC. The primary LCD will display the
measured temperature or the ”----” message, if the measured temperature
is out of range.
• Immerse the temperature probe 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 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, “CFM” tag will blink.
• Press CFM to confirm. The secondary LCD will
display 50.0 ºC.
• Immerse the temperature probe into the second vessel as close 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,
“CFM” tag will blink.
• Press CFM to confirm. The instrument returns to
measurement mode.
MODE RCL
LOG CFM
LOG CFM