Hach-Lange SI792(x) E HACH GLI 3700 series SI792(x) T 7MA2200 and 8398 series User Manual - Manual (Page 65)

Operation—Foundation Fieldbus
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6.2.4 Calibration via Foundation Fieldbus
The transmitter can be calibrated via Foundation Fieldbus using the
comparison or grab sample method.
1. Make sure the system is configured for conductivity
(PRIMARY_VALUE_TYPE = mS/cm or S/m).
2. Collect a grab sample and set CAL_SAMPLE_PRD to sample. The
conductivity value of the sample is stored. After writing, the
parameter is automatically reset to NOP (no operation).
3. Read the parameter CAL_SAMPLE_PRD_STORED_VAL. It
contains the stored value.
4. Measure the grab sample and write the lab value in
CAL_PRODUCT. The device is now calibrated.
CAL_SAMPLE_PRD_STORED_VAL is reset to zero.