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1、热电偶经过一段时间的使用,由于热电极变质,热电势可能发生变化,判断热电偶变质的方法是:根据热电偶的色变程度就可以判断.例如铂铑-铂热电偶的热电极呈灰白色,有少量光泽,说明轻度变质,呈乳白色而没有光泽说明中度变色,呈黄色或硬化说明较严重变质,呈黄色,变脆,有麻面说明变质严重,由于铂铑-铂是贵重金属,对变质的电极可以用清洗和退火处理来回收使用.有例如镍铬-镍铝热电偶的热电极,变质时,由于程度不同,分别呈白色,黄色,绿色等颜色,对变质的镍铬-镍铝热电偶一般是剪去变质部分,重新焊接使用.若要看测量是否准确对照下列表格热电偶温度与热电势绝对毫伏数据对照表单位：毫伏(mV)温度(C)铂铑10铂S镍铬镍硅K
2、镍铬铜镍E铁铜镍J铜铜镍T铂铑30-铂铑6B0000000500.2992.0223.0472.5852.0350.0021000.6454.0956.1375.2684.2770.0331501.0296.1379.7878.0086.7020.0922001.4408.03713.41910.7779.2860.1782501.87310.15117.17813.53312.0110.2193002.32312.20721.03316.32514.8600.4313502.78614.29224.96119.08917.8600.5964003.26016.39528.94321.8462
3、0.8690.7864503.74318.51332.96024.6071.0025004.23420.64036.99927.3881.2415504.73222.77241.04530.2101.5056005.23724.99245.08533.0961.7916505.75127.02249.10936.0662.1007006.27429.12853.11039.1302.4307506.80531.21457.08342.2832.7828007.34533.27761.02245.4983.1548507.89235.31464.92448.7163.5469008.44837.
4、32568.78351.8753.9579509.01239.31072.59354.9484.38610009.58541.26976.35857.9424.833105010.15513.2025.297110010.75445.1085.777115011.34846.9856.273120011.94748.8286.783125012.55050.6337.308130013.15552.3987.845135013.76154.1258.393140014.3688.952145014.9739.519150015.57610.094155016.17610.674160016.77111.257170012.426180013.585导线颜色：SC红绿NC红黄KC红蓝KX红黑EX红棕JX红紫TX红白*红色都是正极
