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 PTDR systems are driven by proprietary, state-of-the-art instrumentation and computerized control systems. The Human Machine
Interface (HMI) system is the process control system that provides a
graphics-based visualization of the system control and monitoring
system. The HMI communicates with the process logic control system
integrated within a PTDR system. The control system obtains inputs from
all of the process subsystems to achieve total overall control of the
system. Safety, interlocking features and emergency shut-down aspects
specific to each subsystem are incorporated to assure safety features
are not compromised.
While the operations can be monitored and controlled using the HMI
system, the operator is also provided with a Supervisory Control And
Data Acquisition (SCADA) system – a distributed measurement and control
system, which includes hardware and software components. Each subsystem
has customized interface screens. The SCADA system monitors critical
input and output parameters and prompts the operator to make
appropriate adjustments (or makes automatic adjustments for critical
safety-related conditions) to the waste feed rate, plasma reactor
temperature, oxidant input (if required), and the gas cleaning and
conditioning system to ensure that the system operates to meet
prescribed environmental requirements. The SCADA system also records
and logs all events onto a hard disk, which can be printed for further
assessment.
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