Modular Differential Pressure Measurement with Galvanic Isolation
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Solution Overview
Problem
Existing differential pressure measuring devices face challenges due to extensive cabling and interference issues, particularly when the evaluation module is distant from pressure transducer modules, leading to malfunctions and accessibility problems, especially in harsh environments.
Innovation Solution
A modular measuring device comprising separate pressure transducer modules and an evaluation module, connected via cable connections, with a mapping unit in the second pressure transducer module to process and transmit signals, and a galvanically isolating interface for immunity to interference, allowing for efficient calculation and output of differential pressure signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the evaluation module is positioned at a large distance from the pressure transducer modules, then the measurement can be performed in harsh environments away from the process opening, but the cabling complexity increases and interference immunity deteriorates
Solution Approach 1:
The measuring device is divided into separate modules: pressure transducer modules (PTM1, PTM2) that can be positioned near the process opening and an evaluation module (EV1) that can be located in a more accessible position. These modules are connected via cable connections (K1, K2), allowing spatial separation while maintaining functional integration. This segmentation resolves the contradiction by enabling the evaluation module to be positioned away from harsh environments without requiring excessive cabling complexity, as each module handles local signal processing independently.
2Ease of operation
If the evaluation module is positioned at a large distance from the pressure transducer modules, then the measurement can be performed in harsh environments away from the process opening, but interference immunity deteriorates leading to malfunctions
Solution Approach 1:
A mapping unit (M1) is introduced as an intermediary component within the second pressure transducer module (PTM2). This mapping unit receives signals from both pressure transducer modules, performs signal processing and combination, and transmits the processed data to the evaluation module. By placing this intelligent intermediary at the PTM2 location (near the process opening), the system achieves better interference immunity locally while still allowing the evaluation module to be positioned in a more accessible location, thus resolving the contradiction between accessibility and reliability.
3Adaptability or versatility
If separate pressure transducer modules are used with remote signal transmission, then the differential pressure measurement can be performed with distributed sensing, but the device complexity and cabling requirements increase
Solution Approach 1:
The mapping unit (M1) in the second pressure transducer module (PTM2) merges the signals from both pressure transducer modules by receiving and combining the first measured pressure value from PTM1 and the second measured pressure value from PTM2. This signal merging function consolidates the data transmission requirements, allowing the system to achieve distributed sensing capabilities while reducing overall cabling complexity compared to completely separate signal paths. The combined signal processing at PTM2 reduces the burden on remote cabling.
Data Source
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AI summary
The invention relates to a measuring device for outputting a measurement signal representing the difference between a first pressure and a second pressure. The measuring device comprises a first pressure transducer module (1) for outputting a sequence of first signals representing the first pressure; a second pressure transducer module (2) for generating a sequence of second signals representing the pressure; an evaluation module (3) for determining a sequence of differential values between the two pressure values and for outputting a sequence of fourth signals representing the respective difference; a first cable connection (14) between the first and the second pressure transducer module; and a second cable connection (28) between the second pressure transducer module and the evaluation module; the modules being spatially separate from each other; the second pressure transducer module (2) having an imaging unit (24) which is provided for receiving the sequences of first and second signals and for outputting, via the second cable connection (28), a sequence of third signals containing the respective pressure values to the evaluation module (3).