Hach ORBISPHERE 51 Series User Manual page 59

Calibration menu
Calibrations can only be performed once the instrument has been installed, configured, and the channel
has been set up. You must also ensure that you have the correct access rights to access the calibration
menu.
The temperature sensor is factory calibrated and can only be changed by a Hach representative.
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Figure 39 Calibration menu (cont. from previous page)