Towel rack redbox

The instability of many thermocouples is caused by the oxidation of the filaments. Copper-constantan, iron-constantan, nickel-chromium-nickel-silicon and other products can all have oxidation reactions. If the hot electrode is averagely oxidized, the impact may be small; if there is preferential oxidation, the impact is very serious. At low oxygen partial pressure, the chromium in the nickel-chromium electrode will produce preferential oxidation and change