Pil Detection Technology; Introduction - Emerson Rosemount 3051S Series Reference Manual

Advanced Pressure Diagnostics
October 2016
Figure 6-15. Trend of Standard Deviation in DeltaV Process History View
Finally, when the SPM data is trended in DeltaV, it is possible to configure HI and/or LO alarms on the
mean or standard deviation via the AI Block. This can be done by right clicking on the AI Function Block in
Control Studio, and selecting Assign Alarm. The Block Alarm configuration window will let you set up
desired alarm limits. Refer to the DeltaV books online for detailed information on configuring alarms.
6.4

PIL detection technology

6.4.1

Introduction

Pressure transmitters are used in pressure, level, and flow measurement applications. Regardless of
application, the transmitter is rarely connected directly to the pipe or vessel. Small diameter tubes or
pipes commonly called impulse lines are used to transmit the pressure signal from the process to the
transmitter. In some applications, these impulse lines can become plugged with solids or frozen fluid in
cold environments, effectively blocking the pressure signals
know that the blockage has occurred. Because the pressure at the time of the plug is trapped, the
transmitter may continue to provide the same signal as before the plug. Only after the actual process
changes and the pressure transmitter's output remains the same may someone recognize that plugging
has occurred. This is a typical problem for pressure measurement, and users recognize the need for a
plugged impulse line diagnostic for this condition.
84
Reference Manual
00809-0200-4801, Rev DA
(Figure 6-16). The user typically does not
Advanced Pressure Diagnostics