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技術文章 / article 您的位置:網(wǎng)站首頁 > 技術文章 > WRN-421 熱電偶防霜配件的作用是什么

WRN-421 熱電偶防霜配件的作用是什么

更新時間:2025-09-02  點擊次數(shù): 40次

熱電偶防霜配件用于防止低溫環(huán)境中水汽在熱電偶接線盒、保護套管表面凝結成霜或結冰,避免絕緣性能下降與配件損壞,其作用、適用場景及安裝方法如下:

一、核心作用

防止結冰損壞:低溫環(huán)境中(如 - 10℃以下),空氣中的水汽接觸熱電偶低溫部件(如接線盒)會凝結成霜,進一步降溫會結冰,結冰體積膨脹可能導致接線盒開裂、密封墊片損壞;防霜配件可阻止水汽凝結,保護配件結構完整。

維持絕緣性能:霜或冰具有導電性,會使熱電偶絕緣電阻大幅下降(如從 100MΩ 降至 1MΩ 以下),導致測溫誤差增加(誤差可達 ±5℃以上);防霜配件可保持部件干燥,確保絕緣電阻穩(wěn)定在≥10MΩ。

保障信號穩(wěn)定:結冰可能壓迫熱電偶絲或補償導線,導致線路接觸不良,信號中斷;防霜配件可避免結冰,確保信號持續(xù)穩(wěn)定傳輸。

二、適用低溫場景

食品冷藏與冷凍場景:如冷庫(溫度 - 20~-5℃)、冷凍食品生產(chǎn)線(溫度 - 30~-10℃),熱電偶用于監(jiān)測冷庫溫度或食品加工溫度,環(huán)境濕度高(通常 60%-80%),易結霜結冰,需安裝防霜配件。

低溫實驗環(huán)境:如實驗室低溫箱(溫度 - 80~-20℃)、超導實驗裝置(溫度 - 270~-100℃),熱電偶用于測溫,環(huán)境濕度雖低,但部件冷熱交替(如從常溫放入低溫箱)時,表面易凝結水汽,需防霜保護。

戶外低溫場景:如北方冬季戶外設備(溫度 - 30~0℃,如管道、儲罐測溫),雨雪天氣后水汽易在熱電偶表面凍結,導致配件損壞與測溫不準,需加裝防霜配件。

三、正確安裝使用方法

配件選型:根據(jù)低溫程度選擇防霜配件類型,①-5~-20℃場景:選用加熱型防霜接線盒(內(nèi)置 10-20W 加熱片,溫度控制在 5-10℃);②-20~-80℃場景:選用保溫 + 加熱組合防霜套件(保溫層為聚氨酯泡沫,厚度 20-30mm,加熱片功率 30-50W);③-80℃以下超低溫場景:選用真空絕熱防霜套管(利用真空層阻斷熱交換,配合低溫絕熱材料,如玻璃纖維棉)。

安裝要點:①加熱型接線盒需緊貼熱電偶接線盒安裝,確保加熱片與接線盒外殼良好接觸(可涂抹導熱硅脂提升熱傳導),電源線需選用耐低溫電纜(如聚四氟乙烯絕緣電纜,耐溫 - 60℃);②保溫層需完整包裹保護套管與接線盒,接口處用膠帶密封(選用耐低溫膠帶,如聚酰亞胺膠帶),避免縫隙進水汽;③真空絕熱套管安裝時需避免碰撞,防止真空層破損(破損后保溫效果下降 50% 以上),安裝后需檢查真空度(用真空壓力表測量,真空度應≤1Pa)。

使用維護:①定期檢查加熱片工作狀態(tài)(用萬用表測量加熱片電阻,如 10W 加熱片電阻應約 576Ω,偏差超 ±10% 需更換);②每 3 個月檢查保溫層是否破損、受潮(受潮后保溫性能下降,需更換干燥保溫層);③超低溫場景中,每 6 個月檢測真空絕熱套管的真空度,若真空度下降,需重新抽真空或更換套管。


聯(lián)


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