What are the problems encountered when using an industrial pH meter?
pH measurement is widely used in food, chemical, pharmaceutical, and wastewater treatment. With the development of chemical industry, especially the rapid development of coal chemical industry, pH measurement becomes an important process indicator. In order to meet the needs of chemical production, on-line industrial pH detection has become the main way of working.
At present, most of the pH meters use composite glass electrodes, which have accurate measurement results and small measurement errors. However, the composite glass electrode is still very demanding on the working environment. Such as ambient temperature, process media temperature, process pipeline pressure, process media flow rate. If the selection, installation method and other aspects are not well considered, the following problems will occur.
(1) installed in the process pipeline pH meter, the pressure is too large, pH flow cell does not play a role in reducing the pressure, resulting in glass tube electrode damage, or electrode into the liquid.
(2) pH meter installed in the field environment temperature difference, protection is not in place or missing, resulting in pH meter by the ambient temperature and can not be stable measurement.
(3) pH meter installed in the process pipeline, the temperature of the medium is high, not enough protection and relative temperature compensation, resulting in pH meter measurement value is not stable and accurate.
(4) pH meter installed in the liquid-solid two-phase flow, resulting in a film on the glass tube electrode by the serious scouring and damage.
(5) pH meter fixed installation in the depth of solution, resulting in electrode cable immersed in liquid for a long time, resulting in cable damage, electrode transmission of millivolts of weak signals are seriously interfered with.
(6) in the process of production stop working, pH meter electrode in the long-term lack of liquid exposure, resulting in electrode attached to the film dry crack aging, or material adhesion package, contact with air and other states, maintenance and protection is not timely, not in place.
