Lower- and Upper Range values abbreviated LRV and URV, respectively are the values of process measurement deemed to be 0% and 100% of a transmitter’s calibrated range. For example, if a temperature transmitter is calibrated to measure a range of temperature starting at 300 degrees Celsius and ending at 500 degrees Celsius, its LRV would be 300 °C and its URV would be 500 °C
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Reference and Further Reading: Basics of Industrial Instrumentation Handbook