AutoQuiz: How Do You Compute Electronic Pressure Transmitter Output?

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.

Discount Alert: ISA is offering a one-time only special for the Extreme Instrumentality course at 40% off regular pricing. This special is for the pilot course offering only.

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

 

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.

 

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