如熱電偶絕緣了，保護(hù)管和拉線板污垢或鹽渣過多致使熱電偶極間與爐壁間絕緣不良，在高溫下更為嚴(yán)重，這不僅會(huì)引起熱電勢(shì)的損耗而且還會(huì)引入干擾，由此引起的誤差有時(shí)可達(dá)上
上海祥樹ETA1610-21-5A
由于熱電偶的熱惰性使儀表的指示值落后于被測(cè)溫度的變化， 在進(jìn)行快速測(cè)量時(shí)這種影響尤為突出。所以應(yīng)盡可能采用熱電極較細(xì)、保護(hù)管直徑較小的熱電偶。測(cè)溫環(huán)境許可時(shí)，甚至可將保護(hù)管取去。由于存在測(cè)量滯后，用熱電偶檢測(cè)出的溫度波動(dòng)的振幅較爐溫波動(dòng)的振幅小。測(cè)量滯后越大，熱電偶波動(dòng)的振幅就越小，與實(shí)際爐溫的差別也就越大。當(dāng)用時(shí)間常數(shù)大的熱電偶測(cè)溫或控溫時(shí)，儀表顯示的溫度雖然波動(dòng)很小，但實(shí)際爐溫的波動(dòng)可能很大。為了準(zhǔn)確的測(cè)量溫度，應(yīng)當(dāng)選擇時(shí)間常數(shù)小的熱電偶。時(shí)間常數(shù)與傳熱系數(shù)成反比，與熱電偶熱端的直徑、材料的密度及比熱成正比，如要減小時(shí)間常數(shù)，除增加傳熱系數(shù)以外，有效的辦法是盡量減小熱端的尺寸。使用中，通常采用導(dǎo)熱性能好的材料，管壁薄、內(nèi)徑小的保護(hù)套管。在較精密的溫度測(cè)量中，使用無保護(hù)套管的裸絲熱電偶，但熱電偶容易損壞，應(yīng)及時(shí)校正及更換。
上海祥樹ETA1610-21-5A
上海祥樹ETA1610-21-5A
NORD SK71S/4 14851690
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HBM HBM AE101
Hydroscand 5552-23-12
