Hach-Lange SI792 C, SI792x C, SI792x C-FF, SI792x C-PA User Manual - Manual (Page 62)

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 or resistivity
(PRIMARY_VALUE_TYPE = µS/cm, mS/cm, S/m or M Ω/cm).
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. The
CAL_SAMPLE_PRD_STORED_VAL parameter is reset to zero.