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XC系列配热电偶的仪表起始点都从0℃开始。一般连续加热的设备低温段都不用或不常用。在弧长110mm的刻度盘上,刻度很窄,不能反应微小变化,给操作者读数和要求较高条件的调节带来一定困难。为提高仪表灵敏度,在测温所需范围内,把刻度展宽,我们做了如下实验: 热电偶的分度值及配套仪表的示值是在热电偶冷端温度为O℃时标定的。使用中为补偿热电偶冷端温度变化带来的误差,可采用冷端补偿法。如附图所示,图中R_1R_2R_G为锰铜丝电阻,Rw为铜电阻,设电桥在0℃时平衡。R_1·R_G=R_2·Rw(O℃)如Rw与热电偶冷端置于同一环境中,利用Rw随温度升高而增大在
XC series with thermocouple instrument starting point from 0 ℃ start. General continuous heating of low temperature equipment are not or not commonly used. In the arc length of 110mm dial, the scale is very narrow, can not respond to small changes to the operator readings and conditions require higher regulation of certain difficulties. In order to increase the sensitivity of the instrument, we broaden the scale within the range required for temperature measurement. The following experiments were performed: The division values of the thermocouple and the corresponding instrumentation are calibrated when the cold junction temperature of the thermocouple is 0 ° C. In use to compensate for the error caused by changes in the thermocouple cold junction temperature, cold junction compensation method can be used. As shown in the figure, R_1R_2R_G in the figure is a manganese copper wire resistance, Rw is a copper resistance, and the bridge is balanced at 0 ° C. R_1 · R_G = R_2 · Rw (O ℃) If Rw is placed in the same environment as the cold junction of the thermocouple and increases with Rw as the temperature increases