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概述工业生产中经常会遇到这样的问题,要求测量设备或管道二点的温差,而且范围很小。目前仪表厂生产定型的电动或气动温差变送器,由于其量程较窄,(温差△t变化相应的电阻要求变化△Rt≥1.5Ω)而无法使用。天津碱厂氯化铵车间外冷器进出口液体温差△t=1℃,折合成分度号G的铜热电阻电阻变化值△R=0.23Ω,分度号B_(A_2)的铂热电阻电阻变化值△R=0.4Ω,很显然,现有仪表不能胜任。吉林化学工业公司仪表厂在DBW—T型温度变送器基础上,桥路部分作了适当改造,用于工业生产流程,为电阻型小量程温差变送器的推广使用,开创了一条切实可行的道路。
Overview Often encountered in industrial production such problems require measuring equipment or pipe two temperature differences, and a small range. The current factory production stereotypes of electric or pneumatic temperature transmitter, due to its narrow range (temperature change △ t corresponding changes in resistance requirements △ Rt ≥ 1.5Ω) and can not be used. Import and export liquid temperature difference △ t = 1 ℃, equivalent to the composition of the degree of resistance G of the resistance value of copper resistance △ R = 0.23Ω, sub-degree number B_ (A_2) of the platinum RTD resistance The change in value ΔR = 0.4Ω, it is clear that the existing instruments can not do it. Based on the DBW-T temperature transmitter, the instrument factory of Jilin Chemical Industry Co., Ltd. has made suitable modifications to the bridge part for the industrial production process and has created a practical application for the popularization and application of the resistance-type small-range temperature difference transmitter path of.