Users Manual
32
CALIBRATION
The probe has a built-in temperature sensor and the thermal transfer is made via the stainless steel
contact located on the probe body. The contact point must be fully immersed in solution and in
thermal equilibrium with the solution measured during calibration. The greater the difference between
the temperatures at which the probe was stored and the temperature of the sample, the longer it
will take to reach thermal equilibrium. When the probe is connected to the meter and the meter
is powered, the temperature is displayed. Observe when temperature is stable before conducting a
temperature calibration. A reference thermometer with 0.1 °C (or better) accuracy is suggested.
Note: Calibration data for temperature is stored in the probe memory.
Procedure
Remove the protective shield from probe. Place HI764113 probe and the reference thermometer into
a stirred container of water. Ensure the temperature contact on the probe is submerged in the water.
Observe the temperature on display until it stops changing (this may take several minutes).
Press CAL from any measure mode (DO, BOD, OUR or SOUR). The calibration menu will be displayed.
Press Temp to select the temperature calibration.
Use the / keys to set the calibration point values to that of the reference thermometer. When
available, CFM will appear on the display.
Press CFM to complete the calibration.
To clear the user temperature calibration at any time, press CAL from any measure mode (DO, BOD,
OUR or SOUR). The calibration menu will be displayed. Press the Temp functional key then Clear. The
previous user calibration has been removed and the factory calibration restored.
Press ESC button at any time to escape from the calibration without changing values.
”CAL DUE” will be displayed and a probe calibration must follow.