Hanna Instruments HI 3512 User Manual

Page 59

• Press

CAL key on the pH range or on the EC range. The calibration

screen is displayed. Press

Temp function key to enter the temperature

calibration mode. The temperature calibration is performed for the
current channel only. The calibration routine is the same for both
channels, so Ch1 calibration is presented next.

• 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

temperature probe or the EC

probe to the appropriate socket.

• Immerse the temperature probe or the EC probe including temperature

sensor 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 calibration point value to that of ice

and water mixture, measured by the reference thermometer. When
the reading is stable and close to the selected calibration point, the
Confirm function key is displayed.

• Press

Confirm to confirm.

• The second expected calibrated point is displayed.

• 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.

TEMPERATURE CALIBRATION

(for technical personnel only)