ENDRESS+HAUSER 's TopCal S system for hygienic applications enables pH electrodes to be automatically cleaned and buffered without shutting the process.
TopCal S enables more accurate and reliable pH monitoring of processes, extends electrode life and reduces maintenance requirements.
The system is fully automated to user-defined specifications. It is based around a fully automated, pH electrode retraction assembly, made of stainless steel and designed to meet all FDA, 3A and EHEDG (European Hygienic Engineering & Design Group) hygiene requirements for measuring instruments.
The assembly is mounted to the side of the vessel, where it supports the electrode in the process and pneumatically retracts it into a sealed cleaning chamber when scheduled.
Within the chamber the electrode is hygienically washed and buffered before being returned to the process.
The slope of the electrode is automatically checked each time it is buffered, and a maintenance warning message is sent to the operators when it nears the end of its life.
Where continuous pH readings are not needed, the electrode is held in a neutral state within the chamber for a user-defined period, significantly extending its longevity.
Where Endress+Hauser IsFET (glass-free) solid-state electrodes are used, the chamber provides protection from caustic solutions during cleaning cycles.
The TopCal S system also comprises a fully programmable control unit containing cleaning and buffering fluids, and a transmitter with 4-20mA, HART and Profibus interfaces.
Endress+Hauser's user-friendly Readwin software provides fixed and user-definable programs. The units can be operated remotely or on-site, and cleaning cycles are triggered automatically.
The system also provides maintenance request indicators and audit trails for quality assurance.
The simple, modular design minimises installation costs and maintenance requirements, making TopCal S a cost-effective choice for any plant where pH measurements are critical.
TopCal S is already installed in several Australian food processing sites, and feedback from process engineers on accuracy and cost-effectiveness has been positive.