Pressure Membrane Fouling Detection Using Process Micropulsations
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing pressure measuring devices lack a method to detect coatings and adhesions on the outside of their measurement membranes, which can affect the deflection behavior and sensitivity, necessitating empirical cleaning cycles without visual inspection.
Innovation Solution
The method involves detecting micropulsations induced by specific operating states of the process facility, storing these as setpoint values, and comparing actual values to these setpoints to generate an alarm when deviations occur, allowing timely cleaning initiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pressure measuring devices are used in hermetically sealed process facilities, then reliable pressure measurement is achieved, but regular inspection to determine cleaning needs becomes impossible
Solution Approach 1:
The pressure measuring device monitors its own measurement membrane condition by detecting micropulsations generated during specific operating states. The evaluation unit compares actual micropulsation values against stored setpoint values to determine when the measurement membrane requires cleaning, enabling self-diagnosis without external inspection.
2Ease of operation
If cleaning is performed according to empirical specifications, then maintenance is simplified, but timely detection of measurement membrane contamination is lost
Solution Approach 1:
The system continuously monitors micropulsation characteristics and provides feedback about the measurement membrane's condition. When contamination is detected through comparison of actual values with setpoint values, the system generates an alarm signal that triggers timely cleaning, replacing empirical schedules with condition-based maintenance.
3Difficulty of detecting and measuring
If additional detection structures are added to the pressure measuring device, then coating detection capability is improved, but device complexity increases
Solution Approach 1:
The pressure measuring device uses its existing measurement membrane and evaluation unit to detect coatings. The measurement membrane itself serves as the sensing element, and the existing evaluation unit processes micropulsation signals to detect contamination, avoiding additional detection structures.
4Measurement precision
If measurement membrane deflection behavior changes due to coatings, then sensitivity is affected, but no detection mechanism exists
Solution Approach 1:
The system detects micropulsations - mechanical vibrations - generated during specific operating states of the process facility. Changes in the measurement membrane's response to these micropulsations indicate coating formation, allowing detection of contamination before it significantly impacts measurement sensitivity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables timely cleaning procedures by self-monitoring the pressure measuring device, preventing metrological failure due to coatings without additional structures, ensuring continued sensitivity and accuracy.
Implementation Method 1
Electrodes are provided in each case on the lower side of the membrane and on the opposite upper side of the base body, which together form a measurement capacitor. A deformation of the membrane occurs due to pressure action, which results in a capacitance change of the measurement capacitor.
Implementation Method 2
the pressure measuring device detects a micropulsation superimposed on the static pressure as an actual value, wherein the micropulsations result from specific operating states of the process facility
Data Source
AI summary
A method for recognizing deposits and/or adhesions on the outside of a measurement membrane of a pressure measuring device within a process facility is disclosed. The pressure measuring device includes a pressure measuring cell comprising a measurement membrane to detect pressure of a medium in a container. The outside of the measurement membrane is at least partially in contact with the medium its second side facing away from the medium includes means for detecting deflection of the measurement membrane. The pressure measuring device detects a micropulsation superimposed on the static pressure as an actual value. Micropulsations result from specific operating states of the process facility. Micropulsation conditions typical of specific operating states have been stored beforehand as setpoint values in an equalization procedure. The detected actual values are compared to the specified setpoint values, and an alarm signal is generated if they exceed and/or fall below the specified values.