Operation & Maintenance of Power Plants
Fig. 3. The Bürkert transmitter Type 8202 (left) is a compact and modular device specially designed for measuring the pH or O.R.P. value of fluids while the Type 8222 conductivity transmitter has three cell constant options for diverse applications.
Te flexible control and easy adaptation to processes made possible by the 8620 controller are the result of a high-level software architecture, which enables all standard modules to be easily loaded by SD Card, serial interface or remote modem. Alternatively, the future possibility of Ethernet can be used to configure and set the parameters on the controller or down load historical data saved on the SD card. Local manual interface is also available where an operator can simply set and display all important variables and parameters via five soft-touch keys. Once this is achieved, sophisticated electronics and state-of-the-art control algorithms ensure that optimum process control is maintained at all times with minimal operator intervention. Moreover, operating security can be tailored to individual applications, with three levels of human-machine interface available: Open Access, Operator Only Access, or Specialist Access. Te key to this high level, automated control is a 32-bit micro-process controller, supported by an integrated 512 kB flash memory for parameter storage and additional languages. Tis enables the mxCONTROL to support up to a maximum of eight active control loops with minimum sample periods of 100ms (50ms for four active loops). Tis could involve simultaneously processing of up to four analogue, two RTD and eight digital inputs, as well as five relay outputs, four transistor outputs
and four analogue outputs. In addition, data logging and parameterisation uploading and downloading is possible via an SD memory card that fits into the front of the controller via an SD card slot. Safeguarding the continuous operation of the mxCONTROL against the elements is IP65 (NEMA 4X) ingress protection: this is effective when the door of the unit is closed. l
Burkert Fluid Control Systems is based in Ingelfingen, Germany.
www.buerkert.com
Circle 17 or ✔ at
www.engineerlive.com/ipe
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