Patent Document ID: 8712731
Application ID: 13243018
Patent Flag: 1

Claim One:
1. A method of detecting a plugged impulse line in a process measuring device, the method comprising: detecting a pressure in a process flow line, and generating a pressure signal indicative of the pressure; calculating mean values of sampled values of the pressure signal collected over predefined sample windows; calculating standard deviation values of sampled values of the pressure signal collected over the predefined sample windows; creating a model of standard deviation values of the pressure signal as a function of mean values of the pressure signal; predicting standard deviation values of the pressure signal based on mean values of the pressure signal and the model; comparing predicted standard deviation values of the pressure signal to calculated standard deviation values of the pressure signal; and detecting a plugged impulse line when a predicted standard deviation value of the pressure signal differs from a corresponding calculated value of the standard deviation of the pressure signal by more than a predefined amount.