Hach-Lange SI792 P, SI792x P, SI792x P-FF, SI792x P-PA User Manual - Manual (Page 79)

Calibration
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8.2 Temperature probe adjustment
Calibration of the temperature probe is advisable, especially for the
Pt100 temperature probe.
1. Press CAL , enter passcode: 1015, ENTER . CAL TMP will be
displayed for 3 seconds. The process temperature will be shown.
2. Measure the process temperature with an external thermometer.
3. Use the UP ARROW and RIGHT ARROW to enter the value of the
temperature from the external thermometer.
4. Press ENTER to save the value.
5. The transmitter remains in HoLD mode . Press ENTER again.
The transmitter remains in HoLD mode for approximately
20 seconds after calibration and returns to the measurement
mode.
Note: Repeat input of the process temperature value when “Err”
is displayed.