What is the correct connection for a passive transmitter?

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Study for the HART Protocol and 4–20 mA Loop Communication Test. Utilize flashcards and multiple-choice questions, with each question offering hints and explanations. Get ready for your exam!

Multiple Choice

What is the correct connection for a passive transmitter?

Explanation:
A passive transmitter does not source its own current; it is powered by the loop. In a 4–20 mA loop, the loop power supply provides the necessary current and voltage, while the transmitter modulates that current by changing its resistance to reflect the measured value. So the correct connection is the passive transmitter in series with an active loop power supply—the supply drives the loop, and the transmitter varies the current from 4 to 20 mA accordingly. The other options would imply powering the transmitter from the input or using a non-powered arrangement, which isn’t how a passive device operates in a 4–20 mA loop.

A passive transmitter does not source its own current; it is powered by the loop. In a 4–20 mA loop, the loop power supply provides the necessary current and voltage, while the transmitter modulates that current by changing its resistance to reflect the measured value. So the correct connection is the passive transmitter in series with an active loop power supply—the supply drives the loop, and the transmitter varies the current from 4 to 20 mA accordingly. The other options would imply powering the transmitter from the input or using a non-powered arrangement, which isn’t how a passive device operates in a 4–20 mA loop.

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