The post How to Compute Electronic Pressure Transmitter Output 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.
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
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