用 K 型热电偶测量某炉温,已知冷端温度为 30°C ,测得热电动势为 37.724mV ,求被测炉温。 表B-1 镍铬-镍硅热电偶分度表(分度号:K) (参考端温度为0°C) 工作端 温度°C 0 10 20 30 40 50 60 70 80 90 热电动势( mV ) - 0 -0.000 -0.392 -0.777 -1.156 -1.527 -1.889 -2.243 -2.586 -2.920 3.242 0 0.000 0.397 0.798 1.203 1.611 2.022 2.436 2.850 3.266 3.681 100 4.095 4.508 4.919 5.327 5.733 6.137 6.539 6.939 7.338 7.737 200 8.137 8.537 8.938 9.341 9.745 10.151 10.560 10.969 11.381 11.793 300 12.207 12.623 13.039 13.456 13.874 14.292 14.712 15.132 15.552 15.974 400 16.395 16.818 17.241 17.6 18.088 18.513 18.938 19.363 19.788 20.214 500 20.0 21.066 21.493 21.919 22.346 22.772 23.198 23.624 24.050 24.476 600 24.902 25.327 25.751 26.176 26.599 27.022 27.445 27.867 28.288 28.709 700 29.128 29.547 29.965 30.383 30.799 31.214 31.629 32.042 32.455 32.866 800 33.277 33.686 34.095 34.502 34.909 35.314 35.718 36.121 36.524 36.925 900 37.325 37.724 38.122 38.519 38.915 39.310 39.703 40.096 40.488 40.897 1000 41.269 41.657 42.045 42.432 42.817 43.202 43.585 43.968 44.349 44.729 1100 45.108 45.486 45.863 46.238 46.612 46.985 47.356 47.726 48.095 48.462 1200 48.828 49.192 49.555 49.916 50.276 50.633 50.990 51.344 51.697 52.049 1300 52.398 52.747 53.093 53.439 53.782 54.125 54.466 54.807 — —