Hanna Instruments HI 23 Series Instruction Manual page 36

Note
Note
TEMPERATURE CALIBRATION
36
Press SETUP before CFM to exit without changes.
It is suggested to calibrate the offset before entering the cali-
bration buffer direct selection.
The controller is factory calibrated for temperature. However,
the user may also perform a one point temperature calibra-
tion. This procedure is to calibrate the offset only; the slope
will remain as factory calibrated.
• Prepare a beaker containing a solution at a given tem-
perature inside the range of the meter.
• Use a Checktemp or a calibrated thermometer with a
resolution of 0.1° as a reference thermometer.
• Immerse the temperature probe in the beaker as close to
the Checktemp as possible.
• Press and hold first CFM and
then CAL to enter the tem-
perature calibration mode.
• Execute the password proce-
dure.
• Select code 1 via the arrow keys for temperature calibra-
tion and confirm with CFM.
• CAL will blink on the LCD. The measured
temperature will be displayed on both the
primary and secondary LCD.
• Use the arrow keys to set on the secondary LCD the tem-
perature read by the reference thermometer.
• When the reading has stabilized at a value near the cali-
bration point, CAL will stop blinking and an intermittent
CFM will prompt the user to confirm the calibration.
• If the reading stabilizes at a reading significantly variant
from the first setpoint, an intermittent ERROR will prompt
the user to check the beaker or bath.