The post What is the Proper Configuration of an Instrument Current Loop? first appeared on the ISA Interchange blog site.
Today’s automation industry quiz question comes from ISA’s new course, Extreme Instrumentality: Electrical to Instrumentation Cross Training Boot Camp. The class, which is offered from September 29 to October 2, focuses on the knowledge and skill sets required to function as an instrument maintenance technician. Process measurement techniques, measurement and control equipment, calibrations techniques and calibration equipment will be discussed and utilized in numerous hands-on lab sessions. Knowledge gained from this course is designed to train you to be a key asset to an I&E maintenance team.
You are calibrating an electronic D/P transmitter. The positive terminal of the transmitter should be connected to the:
A) Negative terminal of the power supply
B) Positive terminal of the power supply
C) Positive terminal of the multimeter
D) Positive terminal of an ohmmeter
E) None of the above
This illustrates a series loop. In practice, engineers rarely wire devices in a series as any failure could fail loop and/or loop resistance would be too high.
The correct answer is B.
Source: ISA News
