Hach-Lange SI792 P, SI792x P, SI792x P-FF, SI792x P-PA User Manual - Manual (Page 75)

Calibration
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8.1.1.4 Calibration by comparison— si792 (x) P (HART) and
si792x P-FF only
The probe can be calibrated by entering the sample value from
measurement in an instrument such as a laboratory or portable meter
(one-point calibration). The probe does not need to be removed from
the process during calibration. The sample temperature should
correspond to the measured process temperature for accurate results.
1. Press CAL , enter passcode: 1105, ENTER . The display will briefly
show CAL PRD and then StorE.
2. Collect a grab sample for measurement in the lab. Press ENTER to
store the sample value in the transmitter.
The cal mode indicator will flash to indicate that calibration is not
complete. The transmitter will continue to measure and display the
current sample values.
3. Measure the grab sample with a laboratory or portable meter.
4. Press CAL , enter passcode: 1105, ENTER to access the product
calibration once more. The display will briefly show CAL PRD and
then CALC.
5. Edit the displayed value to match the value measured by the
laboratory or portable meter and press ENTER . The slope and offset
will be shown.
94 55.6
96 56.8
98 58.0
100 59.2
102 60.4
Table 19 Slope in % vs. mV/pH unit (Continued)
Slope (%) Slope (mV/pH)