AutoQuiz: What Does a Symbol Depicting a Circle Inside a Box Represent?

AutoQuiz is edited by Joel Don, ISA’s social media community manager.

Today’s automation industry quiz question comes from the ISA Certified Control Systems Technician (CCST) program. Certified Control System Technicians calibrate, document, troubleshoot, and repair/replace instrumentation for systems that measure and control level, AutoQuiz20150417temperature, pressure, flow, and other process variables. This question reflects those in the Level I study guide, Domain 2, loop checking. Level I represents a professional who has a five-year total of education, training, and/or experience.

The function symbol below indicates what kind of field-mounted industrial element?

a) programmable logic controller
b) computer function
c) shared display, shared control
d) discrete instrument
e) none of the above

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Click Here to Reveal the Answer
The correct answer is c, “shared display, shared control”.

The circle symbol usually represents an instrument. Here are some symbols that represent other types of instruments. (These instrument symbols are standard according to ISA S5.1).

  • Field-mounted (discrete) instrument
    jan72
  • Panel-mounted instrument
    jan73
  • Behind panel-mounted instrument, normally inaccessible to operator
    jan74
  • Auxiliary mounted instrument, normally accessible to operator
    jan75
  • Computer-controlled function
    jan76
  • Programmable logic control
    jan77
  • Shared display, shared control
    jan78
  • Shared display, shared control in primary location
    jan79
  • Computer function, primary location
    jan80
  • Programmable logic control, primary location
    jan81

 

 

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