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How do I calibrate my APERA SX731 portable meter for pH and conductivity readings?

1Answers
StJoy
12/17/2025, 07:22:56 AM

Calibrating your APERA SX731 meter ensures accurate pH and conductivity measurements. Here's a step-by-step guide:

For pH Calibration:

  1. Power on the meter using the power button.
  2. Connect the 201T-S pH electrode to the meter.
  3. Enter calibration mode by briefly pressing the calibration key (c1 will flash).
  4. Rinse the pH electrode with distilled or deionized water and dry it gently.
  5. Immerse the electrode in a pH 7.00 buffer solution and stir briefly.
  6. Allow the reading to stabilize on the display.
  7. Finalize the first-point calibration by briefly pressing the calibration key again (pH 7.00 will flash).
  8. Rinse the pH electrode with distilled or deionized water and dry it gently.
  9. Immerse the electrode in a pH 4.00 buffer solution and stir briefly.
  10. Allow the reading to stabilize on the display.
  11. Finalize the second-point calibration by briefly pressing the calibration key again (pH 4.00 will flash).
  12. Rinse the pH electrode with distilled or deionized water and dry it gently.
  13. Immerse the electrode in a pH 10.01 buffer solution and stir briefly.
  14. Allow the reading to stabilize on the display.
  15. Finalize the third-point calibration by briefly pressing the calibration key again (pH 10.01 will flash).
  16. The meter will return to measurement mode, signifying successful calibration.

For Conductivity Calibration:

  1. Power on the meter using the power button.
  2. Connect the 2301T-S conductivity electrode to the meter.
  3. Enter calibration mode by briefly pressing the calibration key (cal will flash).
  4. Rinse the conductivity electrode with distilled or deionized water and dry it gently.
  5. Immerse the electrode in a 1413 μS standard solution and stir briefly.
  6. Allow the reading to stabilize on the display.
  7. Complete the calibration by briefly pressing the calibration key again (1413μS will flash).
  8. The meter will return to measurement mode, indicating the calibration is complete.

Always consult your APERA SX731 user manual for detailed instructions and specific model variations.

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