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由节流装置和差压变送器(或靶式流量变送器),压力变送器,乘法器和开方积算器(或流量积算器)以及单针指示仪等组成的饱和蒸汽流量测量系统,在工况压力变化时,可以实现对蒸汽密度的自动修正。该系统的自动修正由压力变送器和乘法器来实现,修正系数的大小为(?)(I 为压力变送器的输出电流)。节流装置(或靶式流量变送器)的密度修正系数大小为(?)、(ρ_H、ρ分别为设计、实际工况的密度)。这样,在仅考虑密度修正的情况下,其密度与压力变送器输出电流的关系为式(1):
By the throttling device and differential pressure transmitter (or target flow transmitter), pressure transmitter, multiplier and square totalizer (or flow totalizer), and single needle indicator composed of saturated steam Flow measurement system, in the working pressure changes, you can achieve automatic correction of steam density. Automatic correction of the system by the pressure transmitter and multiplier to achieve, the size of the correction factor (?) (I for the pressure transmitter output current). The throttling device (or target flow transmitter) density correction coefficient size (?), (Ρ_H, ρ are the design, the actual operating conditions of the density). Thus, in the case of only considering the density correction, the relationship between the density and the output current of the pressure transmitter is formula (1):