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Nuclear-grade pressure transmitters are unfamiliar to most instrument technicians, as few of them have the opportunity to work with them. In this article, Changhui Instruments provides an introductory overview of the performance of nuclear-grade pressure transmitters, aiming to give readers a basic understanding of these devices. Nuclear-grade pressure transmitters are used in nuclear power plants and nuclear industry process control systems to continuously measure process parameters such as the differential pressure, pressure, absolute pressure, and liquid level of gases, liquids, and vapors, converting these measurements into 4-20mA output signals. Did everyone notice? It’s a 4-20mA signal, with no various bus communications! For the reason, please read on. Changhui Instruments will explain below the differences between nuclear-grade pressure transmitters and conventional pressure transmitters: http://yunrun.com.cn/upload/201903/04/201903040251507802.png 1. Nuclear safety technical performance ◆ Radiation resistance Nuclear-grade pressure transmitters are subjected to radiation tests with a cumulative dose of 6×105 Gy; during and after these tests, their basic error remains within ±8% of the maximum range. ◆Seismic performance: Nuclear-grade pressure transmitters are subjected to three-axis seismic tests with vibration frequencies of 2–35 Hz and accelerations of 39.2 m/s2 (i.e., 4g). Both during and after these tests, the basic error remains within ±1% of the maximum range (0.25 grade). ◆Resistance to steam, high temperature, high pressure, and chemical spraying: Nuclear-grade pressure transmitters can withstand exposure to steam at 159°C and 0.55 MPa for 8 hours ； 129°C, 0.17 MPa, held for 56 hours (with chemical spraying) ； At 100°C, after being held for 10 days, its basic error is not greater than ±8% of the maximum range (0.25 grade). 2. Analog electronic circuit technology ensures reliable and safe measurements. ◆ Nuclear-grade pressure transmitters utilize analog electronic circuits only, with no digital or microprocessor-based components; this gives them superior resistance to interference in nuclear power plants and other nuclear industry environments. Additionally, there is no need for the various bus communications used in conventional transmitters. ◆ This eliminates network security threats and reduces operational risks. ◆ Nuclear-grade pressure transmitters exhibit excellent performance in different application conditions. http://yunrun.com.cn/upload/201903/04/201903040236452326.png 3. Industry-leading quality and reliability designs are applied to these sensors. ◆ Fast dynamic response times. ◆ Advanced sensor technology. ◆ Performance that can withstand harsh environmental conditions. http://yunrun.com.cn/upload/201903/04/201903040238051034.png 4. Remote-flange transmitters. ◆ Suitable for harsh environments. ◆ Particularly suitable for continuous measurement of parameters such as level, interface, and flow rate, especially when dealing with viscous, radioactive, sedimentable, or crystallizable liquids. 5. Price of nuclear-grade pressure transmitters. Nuclear-grade pressure transmitters are expensive, costing roughly 10 times more than conventional pressure transmitters. 6. It is necessary to pass the performance tests required for nuclear safety levels. Nuclear-grade pressure transmitters must undergo various verification tests for nuclear-grade instruments, in order to meet the requirements of nuclear industry standards as well as the conditions of the application environments specific to the users. Currently, Shanghai Automation Instrument Co., Ltd. (Automation Instrument Plant No. 1) in China is producing nuclear-grade pressure transmitters. Source: Technical Library http://yunrun.com.cn/tech/