Hach-Lange SI792(x) E HACH GLI 3700 series SI792(x) T 7MA2200 and 8398 series User Manual - Manual (Page 77)

Calibration
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8.1.4 Zero calibration—air
1. Press CAL , enter passcode: 1001, ENTER . CAL ZRO will be
displayed for 3 seconds.
2. Remove and clean the sensor.
Note: Make sure that the sensor is dry.
3. Use the UP ARROW and RIGHT ARROW to change the value until
zero is displayed as the conductivity value.
Note: If the entry of the zero point value takes longer than
6 seconds, the display will alternate between showing the
conductivity value and the temperature value.
4. Press ENTER to confirm.
5. The display will show the new cell constant value and the zero point.
Press ENTER to confirm.
6. Immerse the sensor in the process water.
7. 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.
8.1.5 Zero calibration—calibration solution
Use a calibration solution with low conductivity for calibration.
1. Press CAL , enter passcode: 1001, ENTER . CAL ZRO will be
displayed for 3 seconds.
2. Remove and clean the sensor.
3. Immerse the sensor in the calibration solution.
4. Use the UP ARROW and RIGHT ARROW to change the value until
the conductivity value of the calibration solution is displayed.