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我厂热处理车间,距电炉0.5m处安装了与镍铬-镍硅热电偶配套的EWY-1002型电子电位差计(称仪表),该仪表周围存在很强的电磁场,因而受到很大的干扰。我们采取在仪表中加装双T滤波器等措施后,大大提高了仪表抗横向干扰的能力。但对来自电炉内产生的纵向干扰,还未解决。通过观察和实验了解到,电炉的温度高于700℃以后,耐火砖的绝缘性能便开始下降,其泄漏电流随温度升高而增大,经电炉丝-耐火砖-热电偶保护管-热
I plant heat treatment plant, 0.5m away from the furnace installed with nickel-chromium - nickel silicon thermocouple supporting EWY-1002-type electronic potentiometer (called instrument), there is a strong electromagnetic field around the instrument, which was a lot of interference . We take measures such as installing double T filters in the instrument, which greatly enhances the ability of the instrument to resist lateral interference. However, the vertical interference generated from the electric furnace has not been solved yet. Through observation and experiment, it is learned that after the temperature of the electric furnace is higher than 700 ° C, the insulation performance of refractory bricks begins to decline, and the leakage current increases with the increase of temperature. The electric furnace wire - refractory bricks - thermocouple protection tube - hot