科学和制药进展方面越来越多的研究都依赖于对细胞生长和复杂生化反应的了解和控制。在以上过程中实现气体精确和可追踪的监测和控制很有必要。对诸如二氧化碳、氮气、空气等气体的测定与控制已经可以通过一个简单的可变截面流量计成功实现。但可变截面流量计在精确度、可追踪性和最大允许压力等方面仍然具有明显的局限性。本文所介绍的热式质量流量计和控制系统为流量测定和控制提供了更高的准确度和直接的可追溯性,且此准确度和追溯性几乎不受压力和温度变化的影响。%As more research in science and pharmaceutical development is dependent on understanding and controlling the growth of cells and complex biochemical reactions, accurate and traceable measurement and control of the gases used in these processes are needed. Measuring or controlling gases such as carbon dioxide, nitrogen, and air has typically been done using simple variable-area flowmeters, which have limitations in regard to accuracy, traceability, and maximum allowable pressure. The thermal mass flowmeters and controllers described in this article offer higher accuracy and direct traceability of flow measurement or control that is not hampered and is minimally impacted by changes in pressure or temperature.
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