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为了解决合金钢蠕变试验时炉子临界温度的控制问题,国外试制成M.226型温度控制器。据称这是唯一能用作在几个月内于1000℃以上温度下将温度波动范围控制在±0.25℃以内的工业用仪器。已有56个原型仪器连续使用了三年,其间总共只因维修停歇了3小时。铂电阻温度计是由一个交流威斯顿(Wheatstone)电桥形成的。电桥的预设定臂由一个分成4000级、每级0.25℃的1000欧姆电位计组成。电桥的不平衡电压用一个两段放大器放大2000倍。电压不平衡度由具有两级灵敏度的“电眼”指示器显示。放大的输出也送到一个灵敏电桥上,后者根据炉内温度低于或高于正
In order to solve the control problem of the critical temperature of the furnace in the creep test of alloy steel, the M.226 temperature controller was manufactured in foreign countries. This is said to be the only industrial instrument that can be used to control temperature fluctuations within ± 0.25 ° C at temperatures above 1000 ° C in a matter of months. Fifty-six prototypes have been used for three consecutive years, with a total of only three hours of rest for maintenance. The platinum resistance thermometer is formed from an AC Wheatstone bridge. The bridge’s preset arm consists of a 1000-ohm potentiometer divided into 4,000 steps of 0.25 ° C each. The bridge’s unbalanced voltage is magnified 2000 times with a two-stage amplifier. Voltage unbalance is indicated by a “power eye” indicator with two levels of sensitivity. The amplified output is also sent to a sensitive bridge, the latter based on the furnace temperature is lower or higher than positive