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產(chǎn)品廣泛應(yīng)用于:石油、天熱氣煉油與開采,化工、輕工行業(yè),煉鋼、煉鐵,有色金屬熔煉,電站,電廠,機(jī)械制造,塑料模具及熱流道系統(tǒng),電子、玻璃真空鍍膜等行業(yè)和領(lǐng)域。

如何延長(zhǎng)熱電偶的使用壽命


  熱電偶是工業(yè)爐中測(cè)溫過程中的易損器件,合理選擇和使用以及維護(hù)可以有效的保護(hù)熱電偶,并且可以延長(zhǎng)它的使用壽命,從而節(jié)省生產(chǎn)開支。

  熱電偶是電阻爐中的重要器件,任何測(cè)溫實(shí)驗(yàn)中都需要它來測(cè)量爐內(nèi)的實(shí)時(shí)溫度。熱電偶有著性能穩(wěn)定、精度準(zhǔn)確、結(jié)構(gòu)簡(jiǎn)單、使用方便、測(cè)溫范圍廣、信號(hào)可遠(yuǎn)傳等優(yōu)點(diǎn),在工業(yè)生產(chǎn)和科學(xué)研究等領(lǐng)域中已成為應(yīng)用zui廣泛的感溫元件。但是頻繁的使用也會(huì)使其壽命損耗較快。合理的選擇不同材質(zhì)的熱電偶和增加熱電偶保護(hù)管是很有效的手段。

  熱電偶保護(hù)管主要有兩種用途,一是防止遭受機(jī)械損壞;二是保護(hù)熱電偶免受被測(cè)介質(zhì)化學(xué)腐蝕、不受氧化氣氛或還原氣氛的有害影響,使熱電偶盡可能處于接近其*氣氛中。從而合理的去選擇和使用各種特性的保護(hù)管材料,能夠是熱電偶測(cè)溫過程保持長(zhǎng)期溫度,使用壽命等性能的完善,使得熱電偶的損壞率降低,提高測(cè)溫質(zhì)量。

  保護(hù)管按其材質(zhì)可分為三種:

  1、金屬:機(jī)械強(qiáng)度高、導(dǎo)熱性能好、應(yīng)用非常廣泛。

  2、非金屬:多在1000℃以上溫度測(cè)量時(shí)采用,耐熱性能好,震性差、導(dǎo)熱性差。

  3、金屬陶瓷:由于金屬材料機(jī)械強(qiáng)度高,但不耐高溫;非金屬材料耐高溫,但機(jī)械強(qiáng)度低。用粉末冶金的方法制成金屬陶瓷保護(hù)管,即有耐高溫的性能又有較好的機(jī)械強(qiáng)度,有很好的應(yīng)用前景,可廣泛地用于鋼水、鐵水及高溫鹽浴爐等惡劣的環(huán)境。根據(jù)不同的使用環(huán)境,熱電偶有鋁水熱電偶,鋼水測(cè)溫?zé)犭娕?,銅水熱電偶,耐磨熱電偶,防腐熱電偶,以及真空爐熱電偶等,都是根據(jù)環(huán)境特性進(jìn)行選擇的,從而增加熱電偶?jí)勖?,減少成本。

  除此之外,我們還需要注意以下操作事項(xiàng):1、使用熱電偶前,需要檢查熱電偶的完整,連接補(bǔ)償導(dǎo)線時(shí)瓷板不能用力過大,導(dǎo)致瓷板碎裂,測(cè)溫時(shí)產(chǎn)生下墜,引起熱電偶損壞。2、熱電偶插入高溫爐子前需要進(jìn)行預(yù)熱,或者需要隨著爐子從溫度升至高溫,防止保護(hù)管冷熱溫差大容易致使熱電偶保護(hù)管破裂,引起爆炸。3、對(duì)于一些易碎的陶瓷管,注意測(cè)溫中的輕拿輕放,爐中的防止碰損4、同一爐子中插入至少兩根熱電偶測(cè)溫,以防一根出現(xiàn)故障后,無法判斷爐子溫度5、對(duì)于一些貴金屬,絲用后要可以收集,進(jìn)行回收,舊絲換新絲

相關(guān)新聞


熱電偶補(bǔ)償導(dǎo)線的選擇和分類

熱電偶用補(bǔ)償導(dǎo)線它是在一定溫度范圍內(nèi)(包括常溫)具有與所匹配的熱電偶的熱電動(dòng)勢(shì)的標(biāo)稱值相同的一對(duì)帶有絕緣層的導(dǎo)線,用它們連接熱電偶與測(cè)量裝置,以補(bǔ)償它們與熱電偶連接處的溫度變化所產(chǎn)生的誤差。分為延長(zhǎng)型和補(bǔ)償型兩種。


熱電偶的工作原理

熱電偶的工作原理是兩種不同成份的導(dǎo)體兩端接合成回路時(shí),當(dāng)兩接合點(diǎn)溫度不同時(shí),就會(huì)在回路內(nèi)產(chǎn)生熱電勢(shì)。如果熱電偶的測(cè)量端(感受被測(cè)溫度的端叫測(cè)量端)與參與端(處于已知溫度端叫參比端或叫冷端)存有溫差時(shí),顯示儀表將會(huì)顯示出熱電偶產(chǎn)生的熱電勢(shì)所對(duì)應(yīng)的溫度值。熱電偶的熱電勢(shì)將隨著測(cè)量端溫度的升高而增加。熱電勢(shì)的大小只和熱電偶導(dǎo)體材質(zhì)和兩端的溫差有關(guān),與熱電極的和長(zhǎng)度,直徑無關(guān)。


耐磨熱電偶產(chǎn)生抗干擾的原因

在現(xiàn)代化生產(chǎn)過程中,溫度傳感器發(fā)揮著重要的作用,耐磨熱電偶因具有測(cè)量溫度高、、耐用、熱響應(yīng)時(shí)間快等特點(diǎn),是zui常用的測(cè)度元件之一。但是我們有時(shí)在使用耐磨熱電偶在測(cè)量時(shí)會(huì)遇到一些來之外部的干擾。東臺(tái)市儀達(dá)儀器儀表有限公司從業(yè)多年的工程師詳細(xì)的講解下預(yù)防耐磨熱電偶受到干擾的有效措施。


如何延長(zhǎng)熱電偶的使用壽命

熱電偶是工業(yè)爐中測(cè)溫過程中的易損器件,合理選擇和使用以及維護(hù)可以有效的保護(hù)熱電偶,并且可以延長(zhǎng)它的使用壽命,從而節(jié)省生產(chǎn)開支。


高溫高壓熱電偶的核心部分工作原理和主要特點(diǎn)

高溫高壓熱電偶是一種溫度傳感器,在化學(xué)工業(yè)自控系統(tǒng)中應(yīng)用極廣,通過溫度傳感器,可將控制對(duì)象的溫度參數(shù)變成電信號(hào),傳遞給顯示、記錄和調(diào)節(jié)儀表,對(duì)系統(tǒng)實(shí)行檢測(cè)、調(diào)節(jié)和控制。使用在溫度較高的環(huán)境,因它們?cè)谥校蜏貐^(qū)時(shí)輸出熱電勢(shì)很小,當(dāng)電勢(shì)小時(shí),對(duì)抗干擾措施和二次表和要求很高,否則測(cè)量不準(zhǔn),還有,在較低的溫度區(qū)域,冷端溫度的變化和環(huán)境溫度的變化所引起的相對(duì)誤差就顯得很突出,不易得到全補(bǔ)償。

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