Hanna Instruments HI 9146 User Manual

Page 20

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 DO probe to the appropriate socket.

• With the instrument off, press and hold down the

Range & keys,

then power on the instrument. The “

CALIBRATION” 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.

Note: If the reading is not close to the selected calibration point,

“

WRONG” tag will blink. Change the temperature probe and

restart calibration.

TEMPERATURE CALIBRATION

(for technical personnel only)