What are the problems that occur during the use of industrial pH meters
PH measurement has been widely used in food, chemical, pharmaceutical, sewage treatment and other fields. With the development of the chemical industry, especially the rapid development of the coal chemical industry, pH measurement has become an important process indicator. To meet the needs of chemical production, online industrial pH detection has become the main working method.
At present, most pH meters use composite glass electrodes, which have accurate measurement results and small measurement errors. However, composite glass electrodes still have high requirements for the working environment. Such as ambient temperature, process medium temperature, process pipeline pressure, process medium flow rate, etc. If the selection and installation methods are not carefully considered, the following problems may occur.
(1) The pH meter installed on the process pipeline is subjected to excessive pressure, and the pH circulation pool does not have a pressure reducing effect, resulting in damage to the glass tube electrode or electrode inflow.
(2) The pH meter is installed in a field environment with large temperature differences, inadequate or missing protection, resulting in the pH meter being affected by environmental temperature and unable to measure stably.
(3) The pH meter is installed in the process pipeline, and the temperature of the medium is high, without sufficient protection and relative temperature compensation, resulting in unstable and inaccurate pH meter measurements.
(4) The pH meter is installed in liquid-solid two-phase flow, causing severe erosion and damage to the membrane on the glass tube electrode.
(5) The pH meter is fixedly installed in a deep solution, causing the electrode cable to be immersed in the liquid for a long time, resulting in cable damage and severe interference to the weak millivolt signal transmitted by the electrode.
(6) When the process production stops working, the pH meter electrode is exposed for a long time due to a lack of liquid, causing the electrode film to dry, crack and age, or the material to adhere and wrap, and come into contact with air. The maintenance and protection are not timely and in place.
