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希尔思仪表公司研究开发了新款插入型热式质量流量计VA 450。相比于在过去的5年中被广泛应用在各类工厂气体供应系统中的VA 400系列流量计。VA 450在以下几个方面有了新的突破:
Hill Instruments Inc. has developed a new plug-in thermal mass flow meter VA 450. Compared to the VA 400 Series flowmeters that have been widely used in various types of factory gas supply systems for the past five years. VA 450 in the following areas have made new breakthroughs: