Brief Analysis of Quality Judgment for Industrial On-Line pH Meters
1. Accuracy: Industrial online pH meters without accuracy have no practical value. The way to judge is to use high-precision instruments to assess the stability of the online pH meter. The same industrial online pH meter can be placed in a stable solution for a long time to see if the value changes and the magnitude of the change; On the other hand, the stability of multiple industrial online pH meters can be improved by placing several calibrated industrial pH meters of the same model in the same stable solution to check if the readings are consistent and how much error there is. If stability cannot be guaranteed between several industrial online pH meters of the same model, it is difficult to ensure the accuracy and stability of each instrument.
2. Common error adjustment: Temperature is the most significant factor causing pH errors, and the presence or absence of temperature probes, as well as the sensitivity of temperature probes, also affect the use of industrial online pH meters.
3. Easy to operate and aesthetically pleasing interface: Users can easily judge this aspect. Some old-fashioned industrial online pH meters use analog switches, which makes calibration difficult and small changes difficult to detect, leading to fatal system errors. On the other hand, considering cost and technological reasons, many instruments use LED digital tubes, which do not display rich content. Of course, some manufacturers have also made up for this disadvantage through certain means. At present, the commonly used interface for convenient operation is generally an LCD liquid crystal display keyboard type humidity sensor probe, stainless steel electric heating tube, PT100 sensor, fluid solenoid valve, cast aluminum heater, and heating coil.
4. The advantages and disadvantages of PH electrodes: There is no doubt that the performance of electrodes directly affects some technical indicators of industrial online PH meters. Even the most superior industrial online PH meter is equipped with inferior electrodes, which is useless.
5. Safety: In recent years, more and more customers have begun to pay attention to operational safety. A well-designed industrial online pH meter using a lower safety voltage input can greatly improve safety performance.
