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ORP Calibration

1. 

Place the clean sensor in ORP calibration solution. Wait for the ORP and 
temperature readings to stabilize.

2. 

Press and hold 

Cal

  for three seconds. 

3. 

Highlight 

ORP

 and press 

Enter

. If ORP is not listed as an option, check the 

System Setup menu to ensure ORP is enabled in the ISE Sensor Type menu.

4. 

Use the up and down arrow keys to adjust the ORP calibration solution value. 

5. 

Wait for the temperature reading to stabilize, then press 

Enter

 to complete the 

calibration or press 

Cal

  to cancel. 

6. 

Calibration Successful

’ will display for a few seconds to indicate a successful 

calibration and then the instrument will return to the Run screen.

7. 

If the calibration is unsuccessful, an error message will display on the screen. 
Press the 

Cal

 key to exit the calibration error message and return to the Run 

screen. Refer to the troubleshooting section of the manual for a possible 
solution or contact YSI Technical Support.

7. 

Rinse the sensor and place it in the second pH buffer (4/4.01 or 10/9.18). If 
necessary, use the up and down arrow keys to adjust the pH buffer value. 

8. 

Wait approximately 30 to 60 seconds for the pH sensor to stabilize and for the 
temperature reading to stabilize. 

9. 

Press 

Enter

 to either complete the 2-point calibration or to continue with the 3rd 

calibration point. Or, press 

Cal

  to cancel.

10. 

If continuing on with a 3rd calibration point, rinse the sensor and place it in the 
third pH buffer (4/4.01 or 10/9.18). If necessary, use the up and down arrow keys 
to adjust the pH buffer value. 

11. 

Wait approximately 30 to 60 seconds for the pH sensor to stabilize and for the 
temperature reading to stabilize.

12. 

Press 

Enter

 to complete the 3-point calibration. Or, press 

Cal

  to cancel. 

13. 

Calibration Successful

’ will display for a few seconds to indicate a successful 

calibration and then the instrument will return to the Run screen.

14. 

If the calibration is unsuccessful, an error message will display on the screen. 
Press the 

Cal

 key to exit the calibration error message and return to the Run 

screen.

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