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涟浚analysis of the causes of frequent failure of differential pressure transmitters in steam flow measurement
In the boiler steam flow measurement inside the differential pressure transmitter damage is very frequent, replacement of multiple products, the fault still exists, after troubleshooting the product measured by the medium temperature does not exceed 85 °C, and the measured steam temperature up to 400 °C In the normal measurement, because of the function of the condenser, the direct contact with the transmitter is condensed water instead of the measured high temperature steam. Therefore, the temperature of the transmitter is not very high and does not exceed the transmitter. The measurement limit, but in the sewage, because the condensate is drained, the high-temperature steam will lead directly to the pressure chamber of the transmitter, causing the transmitter to over-temperature damage, think at this time, installed on the same boiler The water-supply flow transmitter has stable operation for many years without failure, so the main cause of transmitter damage is due to the high temperature of the measured medium.
A diaphragm isolator is installed on the pipelines of the three-transmitter of the transmitter. The pressure of the measured high-temperature medium acts on the isolation diaphragm and passes through the medium-high-temperature silicone oil to the measurement diaphragm of the transmitter. The conversion circuit is poor. The pressure variation is converted into an electrical signal output. In this way, the high-temperature medium will not directly touch the transmitter, and the pressure will be transmitted to the transmitter through the isolation diaphragm and the sealing liquid. Even if the continuous sewage or the leakage valve leaks, it will not cause super. Temperature, or the use of a diaphragm-sealed transmitter, is used to prevent the media inside the pipe from directly entering the pressure sensor assembly in the differential pressure transmitter. The capillary connection between the transmitter and the fluid is avoided. The media is in direct contact with the diaphragm and seal material of the pressure transmitter.
After the above improvements, all differential pressure transmitters that measure steam have never been damaged and have run very smoothly.
Shanghai Sheng Engineering Equipment Co., Ltd. is currently the agent of LABOM China, focusing on the marketing and sales of imported sensors, transmitters, flowmeters and other instrumentation, and sticking to the development direction of multi-species, multi-brand, differentiated and enthusiastic service. Since its establishment, the company has provided customers with high-quality, high-performance imported automation products with perfect management and sincere professional services. In the face of the chaotic accessories market, Shanghai Sheng Engineering Equipment Co., Ltd. will establish the brand image of the industry and devote itself to To provide customers with the world's best meter, the most complete solution, the products provided by the majority of professional manufacturers trust and choice. Users are welcome to negotiate.