aBex pH probe
Maintenance of the pH probe and lifespan
The pH probe does not need to be calibrated. It is only used as a reference electrode, but it must be in good condition, connected and in it´s place. If it is not submerged in the same liquid as the ion probe the measurements will be wrong.
If all the sensor values start to go wrong, the problem could be the pH probe. It could be a dirt problem or end of lifespan. Normally a pH probe lasts between 6 months and 2 years.
Cleaning the probe
Clean the probe. With use, adhesions are deposited on the electrode. To clean the probe, it is recommended to put it under the tap and use a kitchen towel or soft cloth to remove the deposits. Clean and dry the probe connector. If the probe connectors to the aBex are dirty or wet they will transmit the voltage incorrectly, and consequently the readings will be incorrect. Clean and dry both connectors thoroughly.
Checking the condition of the probe
You can check the probe by performing a calibration in autoBalance. Once the calibration is done, inside the “System Info” section in settings, you will find the calibration voltages V4 and V7, the value of v4 should be around 2.0. The v7 value should be around 1.5, and the difference between them should be around 0.5. If this is not the case, it is possible that the probe is not in good condition and needs to be replaced.
- V4 normal: 1.9 – 2.1
- V7 normal: 1.4 – 1.6
- Difference between V4 and V7: 0.44 – 0.56