User Manual Q&AAnswer
Feb 23, 2025 - 11:18 PM
To calibrate the HOBO MX pH and Temperature Logger MX2501, follow these steps:
1. Gather the required items: deionized or distilled water, squirt bottle, calibration solutions (pH 4.01, 7.00, and 10.00), and the logger with the pH electrode installed.
2. Unscrew the clear storage cap from the logger and replace it with a closure cap.
3. Open the HOBOconnect app on your mobile device or computer and connect to the logger.
4. Tap on the logger tile in the app to connect to the logger.
5. If prompted, tap on "Calibrate" to start the calibration process.
6. Use the squirt bottle to rinse the pH sensor with deionized or distilled water.
7. Place the sensor end of the logger in the pH 7 solution and tap "Start". Make sure the sensor end cap, temperature sensor, and closure cap are submerged in the solution. Once the pH reading is stable, tap "Confirm".
8. Rinse the pH sensor with deionized or distilled water.
9. If you are using the pH 4 buffer, place the sensor end in the pH 4 solution and tap "Start". If not, tap "Skip" and proceed to step 12.
10. Once the pH reading is stable, tap "Confirm". Rinse the pH sensor with deionized or distilled water.
11. If you are using the pH 10 buffer, place the sensor end in the pH 10 solution and tap "Start". Once the pH reading is stable, tap "Confirm". If not, tap "Skip".
12. Verify that the slope and offset values are acceptable and tap "Save". If the values are not acceptable, tap the back arrow and repeat the calibration steps as needed.
13. Rinse the pH sensor with deionized or distilled water again.
14. If you are not deploying the logger immediately, place the pH electrode in storage solution. Unscrew the sensor end cap and pour storage solution into the clear storage cap to the marked fill line. Carefully xxxx the clear cap with storage solution onto the logger. Only use storage solution in the clear cap; do not use water. Do not use the copper guard when the pH electrode is in storage solution.
Note: It is important to keep the pH sensor in storage solution when not being calibrated or deployed in water. The hydration layer surrounding the sensor starts to break down after 10 minutes if the pH sensor is not submerged in storage solution or calibration solution, or deployed in water.
For more detailed instructions and information, refer to the HOBO MX pH and Temperature Logger MX2501 Instruction Manual.
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