Question 555General Subjects - Assistant Engineer

The correct answer is C) 685 to 695 psig. The key is understanding the accuracy of the bourdon tube pressure gauge, which is given as plus or minus 0.5% of the span. The span is the full scale range of the gauge, which is 0 to 1000 psig, or 1000 psig. 0.5% of 1000 psig is 5 psig. Therefore, the measured pressure when the gauge indicates 690 psig would have a range of 690 psig +/- 5 psig, which is 685 to 695 psig. The other options are incorrect because they do not accurately reflect the 0.5% accuracy of the gauge. Option A) is too wide, Option B) is too narrow, and Option D) is overly precise given the 0.5% accuracy specification.