熱電偶的電療由兩根不同導體材質組成。當測量端與參比端存在溫差時,就會產生熱電勢,工作機表便顯示出熱電勢所對應的溫度值。
熱電阻是利用物質在溫度變化時,其電阻也隨著發生變化的特征來測量溫度的。當阻值變化時,工作機表便顯示出阻值所對應的溫度值
測量范圍及允差
型 號 | 分 度 號 | 允 差 等 級 | |||
I | II | ||||
允差值 | 測溫范圍°C | 允差值 | 測溫范圍°C | ||
WRN | K | ±1.5°C | -40~+375 | ±2.5 °C | -40~+333 |
±0.004ltl | 375~1000 | ±0.0075 ltl | 333~1200 | ||
WRM | N | ±1.5°C | -40~+375 | ±2.5°C | -40~+333 |
±0.004 ltl | 375~1000 | ±0.0075 ltl | 333~1200 | ||
WRE | E | ±1.5°C | -40~+375 | ±1.5°C | -40~+333 |
±0.004 ltl | 375~800 | ±0.004 ltl | 333~900 | ||
WRF | J | ±1.5°C | -40~+375 | ±1.5°C | -40~+333 |
±0.004 ltl | 375~750 | ±0.004 ltl | 333~750 | ||
WRC | T | ±1.5°C | -40~+125 | ±1°C | -40~+133 |
±0.004 ltl | 125~350 | ±0.0075 ltl | 133~350 |
5、常溫絕緣電阻
熱電阻在環境溫度為15—35°C,相對濕度不大於80%,試驗電壓為10—100V(直流)電療與外套管之間的絕緣電阻>100MΩ。
熱電偶在環境溫度為20±15°C,相對濕度不大於80%,試驗電壓為500±50V(直流)電療與外套管之間的絕緣電阻>1000Ω.m![](http://i04.c.aliimg.com/img/ibank/2013/336/643/1082346633_1638804843.jpg)
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新手教學
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