pH and ORP Applications with Coating Problems

For industrial applications and particularly for automatic process measurements it is of the greatest importance that the sensitive part of a glass electrode and the diaphragm of a reference electrode are kept clean. Often it is not practical to interrupt a process for cleaning the electrodes, an accurate indication is required over a long period, replacing the electrodes is difficult, etc. Then an automatic cleaning mechanism may be the solution.

  • Designed for in-line electrode cleaning in flow fittings, immersion fittings and pneumatic retractable fittings of Yokogawa.
  • Restricts sediment formation on the electrodes and increases the period between calibrations.
  • Optimum cleaning effect.
  • Standardized dimensions for mounting in an electrode hole of a fitting


Traditional Inline Cleaning Mechanism

cb fc20Yokogawa manufactures a chemical cleaning systems for pH and/or ORP (Redox) measurements that works with the combination sensors. The cleaning elements have standardised dimensions formounting in flow-, insertion and immersion fittings. This clenaing appartus can be used with the All-in-One style sensors (FU20/FU24/PH20) or with individual 12mm sensors (SC21/SC29). 

The retractable holder EXAtrac RF20 (Extract 810 and 820) available in plastic, stainless steel and Alloy C22; is made for installation of 12mm sensors on tanks or pipelines where the sensor has to be removed without interruptions or shutdowns and in the hash applications where frequent cleaning is of vital importance for a good pH measurement. The control unit RF20C (EXmatic 460) can fully and automatically control and supervise the measuring- and cleaning cycles of a pneumatic retractable fitting. The cleaning- and measuring intervals, starting signals can be set and changed to the process requirements. The RF20M (EXmatic 450) is a pneumatic control unit for retractable fittings such as the RF20H (EXtract 810 and 820). It is Suitable for hazardous area

Current trend for increasing mercury awareness throughout the public sector has caused the government to take action. Recently, the Environmental Protection Agency (EPA) has focused their efforts on controlling mercury levels produced in various coal fired power plants. Based on information from several case studies, the EPA developed the Mercury and Air Toxics Standards to cut back mercury emissions. The most popular technology utilized by coal plants to meet the new standards is a scrubber which cleans the off gas from the combustion process. ORP sensors can further monitor the effluent from these scrubbers to ensure optimal mercury emission levels are achieved. By closely monitoring the mercury concentrations in the effluent, plant managers will be able to easily confirm their plants are meeting the EPA's standards.


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