Hanna Instruments HI 2222 User Manual

Page 25

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 (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 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

“

• 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.

• Use the ARROW keys to set the reading on the secondary LCD to that

of the hot water.