What does the drift fault of an online pH monitoring instrument mean?
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What does the drift fault of an online pH monitoring instrument mean? How does the failure rate of online pH monitoring instruments compare to that of pressure and temperature instruments? What should be done in situations where greater reliability is required?
Drift fault refers to zero-point drift; when the pH value is zero, the instrument reading is not zero.
If the PH value drifts to zero, pay attention to the usage period – the electrodes used for PH testing have a limited lifespan and need to be replaced in a timely manner； Pressure and temperature instruments are already well-developed products, such as those from EJA and Rosemount. In general, pressure instruments do not need to be calibrated every 5 years, while for temperature instruments, the lifespan depends on the operating conditions; those used in high-temperature or highly abrasive environments have a much shorter lifespan. If you are measuring temperatures of 100°C and do not cause any damage to the instrument, the annual temperature drift is only around 0.1%
All chemical analysis instruments tend to drift; there’s nothing stable about them. Chemistry is after all an unstable field of study, haha. The current measurement technique relies on this hanging sample; to achieve accuracy, frequent calibration is required. Do you understand?
PH electrodes need to be regularly maintained and calibrated to ensure the accuracy of their readings.
The electrodes need to be replaced regularly; we use Rosemont ones, roughly every year or so