Smart Transmitters LRV & URV

The advent of “smart” field instruments containing microprocessors has been a great advance for industrial instrumentation. These devices have built-in diagnostic ability, greater accuracy (due to digital compensation of sensor nonlinearities), and the ability to communicate digitally with host devices for reporting of various parameters. A simplified block diagram of a “smart” pressure transmitter looks something like this: It is important to note all the adjustments within this device, and how this compares to the relative simplicity of an all-analog pressure transmitter: Note how the only calibration adjustments available in the analog transmitter are the “zero” and “span” settings. This is