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Instrumentation is shown in process diagrams usually called :

  • P & I, Piping and Instrumentation, or;
  • PID, Piping Instrumentation Diagram.

The instruments or their functions are designated using the general symbols shown in figure 50 featuring functional identification in their upper section.

instrumentation symbolsSecured image
Figure 50. General instrumentation symbols
formula: instrumentation - AIT, locally installed pH analyser transmitter