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How to Compute Electronic Pressure Transmitter Output

The post How to Compute Electronic Pressure Transmitter Output first appeared on the ISA Interchange blog site.

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

AutoQuiz20150814Today’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.

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If a standard electronic pressure transmitter has a range of 50 to 250 psig (345 to 1724 kPa gage), and the pressure is 150 psig (1034 kPa gage), what is the output in mA?

A) 4.0 mA
B) 12.0 mA
C) 13.6 mA
D) 50.0 mA
E) None of the above


<span class="collapseomatic " id="id982" tabindex="0" title="Click Here to Reveal the Answer“>Click Here to Reveal the Answer

Here is the method for converting milliamps to English units:

% span mA = % span eng units

(Reading mA– LRV mA)/(Span mA) = % Span

% Span X (Spaneng ) + LRVeng

Act reading mA – 4 ÷ 16 x spaneng + LRVeng = Readingeng

The correct answer is B.


Source: ISA News