Hach-Lange SI792 C, SI792x C, SI792x C-FF, SI792x C-PA User Manual - Manual (Page 71)

Calibration
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to determine the temperature-corrected conductivity value of the
calibration solution.
Note: If the entry of the calibration solution value takes longer than
6 seconds, the display will alternate between showing the cell
constant and the temperature value.
4. Press ENTER to save the value.
5. The display will show the new cell constant value and CELL. Press
ENTER .
6. 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 measure mode.
Note: Repeat the calibration when “Err” is displayed.
Note: The si792x C-PA transmitter cannot be calibrated by this method.
8.1.3 Calibration by comparison or grab sample
The sensor can be calibrated by measuring the process water with a
portable instrument or taking a grab sample and measuring its value in
the lab (one-point calibration). The sensor does not need to be removed
from the process during this 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. Measure the process water and press ENTER to proceed. The
current value will be stored, which will be compared to the value
obtained with the lab or portable meter.
The cal mode indicator will flash to indicate that calibration has not
been completed. The transmitter will continue to measure and
display the current sample values.