Measuring Diaphragm Decouples Sensor from Process Fluid
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Solution Overview
Problem
Existing process fluid measurement technologies face challenges in accurately measuring volumetric flow and pressure while preventing contamination and maintaining measurement precision, especially in applications with aggressive media or high temperatures, due to material interactions and interference from pressure and temperature changes.
Innovation Solution
A measuring device with a modular design featuring a shell body, a measuring diaphragm, and a sensor system that decouples the sensor from the process fluid, using a clamping mechanism and elastic elements to maintain sealing and positioning, and a device for adjusting volumetric flow with sensors at different points to manage pressure and temperature effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sensor is directly exposed to the process fluid for measurement, then measurement precision is improved, but the sensor becomes susceptible to contamination and material degradation from aggressive media
Solution Approach 1:
A measuring diaphragm is introduced as an intermediary element between the sensor and the process fluid. The diaphragm transmits pressure and temperature from the fluid to the sensor while preventing direct contact, thus protecting the sensor from contamination and material degradation while maintaining measurement accuracy.
Solution Approach 2:
The measuring device is divided into separate functional sections: a fluid-exposed measuring chamber and a sensor protection chamber. The measuring diaphragm creates a boundary between these sections, allowing the sensor to remain in a protected environment while still measuring fluid properties through the diaphragm.
2Reliability
If the sensor is protected from direct fluid contact, then sensor reliability is improved, but measurement precision deteriorates due to material interactions and interference
Solution Approach 1:
The measuring diaphragm is designed as a thin, flexible film that efficiently transmits pressure and temperature from the process fluid to the sensor. This thin-film structure minimizes measurement interference while maintaining sensor protection, resolving the contradiction between reliability and precision.
3Adaptability or versatility
If a modular design with decoupled sensor is used, then adaptability to different applications is improved, but device complexity increases
Solution Approach 1:
The measuring device employs standardized interfaces and a modular architecture that allow the same basic design to be adapted for different applications by changing the fluid chamber geometry or sensor type, rather than designing entirely separate devices for each application.
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
The solution provides precise measurement of process fluid properties, prevents contamination, and extends the service life of the measuring device by decoupling material interactions, while allowing for flexible design and application in various environments.
Implementation Method 1
an elastic element is arranged in a force path between the clamping means and the measuring diaphragm, in particular between the clamping means and the sensor, and is under pressure. Advantageously, flow processes of the material and different temperature expansions can be compensated for by the elastic element, and the clamping and sealing effect is maintained.
Data Source
AI summary
The invention describes a device (100) for adjusting a volumetric flow of a process fluid. Said device comprises a valve arrangement (400), which is designed to adjust, by means of a drive (402), in particular by means of an electric motor, a position of a shut-off body (442), which interacts with a valve seat (142), within an adjusting portion (140) of the fluid duct (102) depending on an activation signal (S #400). A control device (500) is designed to determine the activation signal (S #400) depending on a first and a second sensor signal (S #200, S #300).