Suppose that a standard remote reading bourdon tube thermometer has a scale of 40 to 240oF. If the accuracy of the thermometer is plus or minus 1% of the span, what would the range of measured temperature be if the thermometer indicates 180oF?

Correct Answer: Option B — 178 to 182oF

The span is 200 degrees (240 minus 40). A 1% accuracy of the span equals 2 degrees. Therefore, the measurement error is plus or minus 2 degrees. At an indicated 180 degrees, the actual temperature range is 178 to 182 degrees Fahrenheit, accounting for the instrument's specified tolerance.