出,不易得到全補(bǔ)償。這時(shí)在中低溫度時(shí),一般使用熱電阻測(cè)溫范圍為一200~~500,甚至還可測(cè)更低的溫度(如用碳電阻可測(cè)到1K左右的低溫).現(xiàn)在正常使用鉑熱電阻Pt100,(也有Pt50、100和50代表熱電阻在0度時(shí)的阻值。在舊分度號(hào)中用BA1,BA2來(lái)表示,BA1在0度時(shí)阻值為46歐姆,在工業(yè)上也有用銅電阻,
熱電偶有正負(fù)極、補(bǔ)償導(dǎo)線(xiàn)也有正負(fù)之分,首先保證連接,配置確.在運(yùn)行中。常見(jiàn)的有短路,斷路,接觸不良(有萬(wàn)用表可判斷)和變質(zhì)(根據(jù)表面顏色來(lái)鑒別)。檢查時(shí),要使熱電偶與二次表分開(kāi),用工具短接二次表上的補(bǔ)償線(xiàn),表指示室溫再短接熱電偶接線(xiàn)端子,表批示熱電偶所在的環(huán)境溫度(不是,補(bǔ)償線(xiàn)有故障),再用萬(wàn)用表mv檔大體估量熱電偶的熱電勢(shì)(如正常,請(qǐng)檢查工藝)。
熱電阻短路和斷路用萬(wàn)用表可判斷,在運(yùn)行中,懷疑短路,只要將電阻端拆下一個(gè)線(xiàn)頭看顯示儀表,如到大,熱電阻短路回零,導(dǎo)線(xiàn)短路,保證正常連接和配置時(shí),表值顯示低或不穩(wěn),保護(hù)管可能性進(jìn)水了顯示大,熱電阻斷路顯示小短路。
第三、從材料上分,熱阻是一種金屬材料,具有溫度敏感變化的金屬材料,熱電偶是雙金屬材料,既兩種不同的金屬,由于溫度的變化,在兩個(gè)不同金屬絲的兩端產(chǎn)生電勢(shì)差。
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