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修改鉑電阻溫度變送器範圍的方法

返回列表 來源：京儀股份发布日期：2020-06-23 11:12

本文修改鉑電阻溫度變送器範圍的方法資料由優質變送器生産報價廠家爲您提供。

　

修改鉑電阻溫度變送器範圍的方法

根據變送器本身的特性，鉑電阻溫度變送器範圍的變化將影響4和20mA檢查點。如果變送器的計算是基于真實零點(真實零點是理論輸出電流爲零點的溫度值)，變送器的校准將非常簡單:根據要求的量程範圍計算量程範圍和真實零點(TRUE-ZERO)的溫度值，然後查閱溫度值對應範圍和真實零點表，根據表中的要求短路對應的焊點，根據校准步驟將變送器調整到要求的範圍。

1.准备一个电阻箱(精度为0.01欧姆)、一个4位半数字电流表(精度在0-20mA范围内为0.05%)和一个DC DC24V电源

2.確定所需範圍，TH=範圍上限(20mA輸出時的溫度值)和Tlo=範圍下限(4mA輸出時的溫度值)

3.計算量程範圍:量程範圍=量程上限-量程下限=TH-Tlo

4.計算真零點:真零點=範圍下限-範圍÷4=Tlo-(量程範圍/4)

5、檢查溫度值對應範圍和實際零點表

6.打開外殼的底蓋，使用需要短路的焊線短路板上的焊點，並移除先前焊接的焊點，以確保它們處于開路狀態。注:變送器電路板上有8組焊點:a、b、c、d變化量程範圍；w，x，y，z改變真零。

7.輸入與Pt100變送器輸出相對應的Pt100鉑電阻的等效電阻值(4mA)，調整Z(零電位計)，使輸出等于4mA±0.01mA。

8.输入Pt100变送器20mA输出对应的Pt100铂电阻的等效电阻值，调整S(零电位计)使输出等于20mA 0.01mA毫安

9.重複步驟7和8，直到變送器的零點和量程被校准。注意:範圍和零點調整會相互影響，必須重複調整。

10.關閉電源並斷開接線。

11.重新創建Pt100溫度變送器新標記。欲了解更多信息，請訪問公司官方網站yb1518/.，轉載時請保留此鏈接！

　

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