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  電(dian)伴(ban)(ban)(ban)(ban)熱(re)(re)帶是由電(dian)能轉(zhuan)化為(wei)熱(re)(re)能對管道介質進行熱(re)(re)補(bu)償的(de)(de)一種保溫(wen)(wen)產品(pin)。應用(yong)區域十分(fen)廣泛(fan)，如電(dian)廠、化工(gong)、石油、消防(fang)、天然氣、建筑及民(min)用(yong)太陽能管道等(deng)，電(dian)伴(ban)(ban)(ban)(ban)熱(re)(re)帶作用(yong)防(fang)凍保溫(wen)(wen)，可分(fen)為(wei)自(zi)限溫(wen)(wen)電(dian)伴(ban)(ban)(ban)(ban)熱(re)(re)帶、恒功率(lv)電(dian)伴(ban)(ban)(ban)(ban)熱(re)(re)帶、MI加熱(re)(re)電(dian)纜和發(fa)(fa)熱(re)(re)電(dian)纜等(deng)四大類型，每一種電(dian)伴(ban)(ban)(ban)(ban)熱(re)(re)帶都有不同(tong)的(de)(de)功能和不同(tong)的(de)(de)用(yong)途，其(qi)發(fa)(fa)熱(re)(re)原理也(ye)是不同(tong)的(de)(de)，那(nei)么其(qi)中自(zi)限溫(wen)(wen)電(dian)伴(ban)(ban)(ban)(ban)熱(re)(re)帶的(de)(de)發(fa)(fa)熱(re)(re)原理是怎(zen)么樣的(de)(de)呢?

  自限溫(wen)電伴熱(re)(re)帶是利(li)用PTC發熱(re)(re)元件將電能轉(zhuan)化為熱(re)(re)能，正溫(wen)度系數的(de)(de)工作(zuo)原(yuan)理使得這(zhe)種電伴熱(re)(re)可(ke)以隨(sui)著溫(wen)度的(de)(de)變化而自我調節(jie)功率大小。從外觀上可(ke)以看(kan)到自限溫(wen)電伴熱(re)(re)帶真正的(de)(de)技術PTC是平行母(mu)線之間的(de)(de)黑色導電塑料層(ceng)，兩根母(mu)線只是起到一個導電的(de)(de)作(zuo)用。這(zhe)樣的(de)(de)特(te)點就決定了(le)自限溫(wen)電伴熱(re)(re)帶安裝可(ke)以進行重(zhong)疊交叉，并不(bu)會因為溫(wen)度過高而燒毀。

  在發熱(re)(re)(re)應用方面自(zi)限溫(wen)(wen)電(dian)(dian)(dian)伴熱(re)(re)(re)帶比其它(ta)電(dian)(dian)(dian)熱(re)(re)(re)產品要(yao)節能(neng)(neng)，有(you)自(zi)動(dong)調節功能(neng)(neng)，能(neng)(neng)隨被伴熱(re)(re)(re)介質的溫(wen)(wen)度變化(hua)自(zi)動(dong)調節輸出功率(lv)，而恒(heng)功率(lv)電(dian)(dian)(dian)伴熱(re)(re)(re)帶、MI加熱(re)(re)(re)電(dian)(dian)(dian)纜(lan)及發熱(re)(re)(re)電(dian)(dian)(dian)纜(lan)等產品是采用發熱(re)(re)(re)絲來(lai)將電(dian)(dian)(dian)能(neng)(neng)轉化(hua)為熱(re)(re)(re)能(neng)(neng)，無法自(zi)我調節溫(wen)(wen)度，必須使(shi)用溫(wen)(wen)控器來(lai)對其進行主動(dong)限溫(wen)(wen)，這也確定了安裝過程中需要(yao)考慮安全間距并且(qie)不能(neng)(neng)交叉重疊安裝。