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9. Move the solution in the calibration cell to ensure it has been in contact with the surface of the sensors and the
inside of the calibration cell. If necessary, reinstall the blue top cap and gently shake.
10. Discard the rinse calibration solution.
11. Repeat steps 8-10. (Note: for best calibration, it is necessary to rinse twice with the calibration solution to ensure
all contaminants have been removed and the solution has wetted the sensor face. Rinsing with DI can lead to
calibration solution contamination).
12. With the sonde and sensors still inverted, fill the calibration cell with 40-50mL (to the bottom of the threads inside of
the restrictor) of fresh calibration solution. Make sure that the calibration solution is approximately 1 inch above the
surface of the sensor face. Check the sensors for bubbles. Gently tap on the surface to remove any bubbles.
Select
Next
.
13. The app attempts to automatically detect the calibration solution and stabilize the measurements.
If you are using a custom standard, the app will not automatically detect it. Instead, a field
will appear in which you can enter the appropriate value. Select
Set User Defined
to
begin calibrating with the new value. If you are not using a custom standard and the app
does not automatically detect the standard, perform the sensor cleaning and maintenance
procedure, then select
Retry Auto Detect
.
14. After the calibration is stable, select
Accept
.
15. The calibration values are applied to the sensor and appear on screen. You can view a full calibration report for all
sensors, or select
Done
to return to the Calibration Menu.
16. To rinse the sensors in between calibration solutions, remove the calibration restrictor and thoroughly rinse the
sensors and restrictor in a bucket of fresh tap water or distilled water. Repeat solution rinse procedure prior to
adding fresh calibration solution. Alternatively, leave the restrictor in place and rinse the sensors thoroughly with
deionized water to remove all calibration standard. Rinse twice with calibration standard.
Not removing all of the previous calibration solution can contaminate the next solution
thus impacting the accuracy of the next calibration or cause much slower sensor response.
Calibrate the ORP Sensor
The ORP sensor can be calibrated using Zobell's standard, Quick-Cal or a custom ORP solution.
1. From the main menu, select
Connected Instrument
.
2. Select
Calibrations
.
3. From the Calibrations menu select
ORP
.