Hanna Instruments HI 98160 User Manual

Page 26

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 (HI 98160) or the pH probe (HI 98140 &
HI 98150).

• With the instrument off, press and hold down the Range & 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.

• Submerse 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”.

• Submerse 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.