Are there any online pH meters in use?
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This post was last edited by zbx on 2010-6-16 at 19:15. This thing often has problems; does it also give inaccurate readings frequently for everyone? ?
The online pH meter used in our facility is quite good; it detected immediately when there was a leak of acid in the cooler.
It’s better to calibrate each time it’s used; otherwise, the data will be only approximate
Online pH meters are used for the monitoring and control of many industrial processes, but the effectiveness of their use depends heavily on the supplier’s experience in this area, as well as on whether the person responsible for selecting them understands the characteristics of the process media involved. The sale of many online analyzers is actually related to the seller’s application experience and sense of responsibility. For different application scenarios, the configuration and selection of online pH meters vary as well, especially for some specialized and highly specific uses. These applications include: 1. Conventional water treatment, 2. Sewage treatment, 3. High-purity water treatment, 4. Use in chemical media, 5. Applications in high-temperature and high-pressure environments, 6. Applications in severely polluted/specially polluted conditions, 7. Use in organic solvent media
An online pH meter is a very important online instrument in production, and it is greatly affected by external conditions (temperature, medium). It is important to ensure proper operation and daily maintenance. 1. Monitor the flow rate, pressure, and temperature of the sampling system daily, ensuring that the sample flow rate remains within the normal range. Because if the flow rate is too low, the instrument responds slowly ； When the flow rate is too high, the instrument readings will fluctuate. In normal-pressure systems, the pressure should be kept below 0.5 Mpa; in high-temperature environments, the sample temperature must not exceed 80°C. 2. Calibrate the instrument with a standard solution once every 3 months. 3. Pay attention to checking the insulation and heating conditions of the sampling pipelines and instrument panels during winter. 4. When cleaning the counter electrode, pay attention to the disassembly method and be careful not to cause any collisions. 5. The dust and dirt on the outer surface of the transmitter can be wiped off using a damp, lint-free cloth. If necessary, various household cleaners can also be used.
Our recirculating water system uses online pH monitoring
Many different PH levels were used; personally, I think Yokogawa’s PH is better. Generally, online pH meters have temperature compensation but not pressure compensation; sometimes they give accurate readings when calibrated using a buffer, but the readings differ from those obtained in actual process pipelines.
There are many online pH meters, such as Yokogawa, GF, Rosemount, ............................................................
Online pH meters must be calibrated regularly
Online pH meters from Yokogawa, Emerson, Hach, and E+H all perform well; there are many successful applications of them in the field. Does the person asking have any issues with making a selection? For example, is the material of the electrode not chosen appropriately? Or is it due to inadequate maintenance work, or insufficient and timely calibration of the standard buffer solutions?