SOLAS Instrumentation Practice Questions - SOLAS Ireland Electrical Instrumentation Apprenticeship (Phase Exams) Exam

What does the HART protocol allow that a plain 4-20 mA loop does not?

It increases the current range to 4-40 mA It superimposes a digital signal on the 4-20 mA analogue signal for two-way communication It converts the signal to a pneumatic 3-15 psi output It removes the need for a power supply in the loop

Correct Answer:

It superimposes a digital signal on the 4-20 mA analogue signal for two-way communication

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