热电阻测量电阻值为112,对应的温度是多少

2025-01-21 05:16:47
推荐回答(3个)
回答1:

热电阻测量电阻值为112,对应的温度大约是30℃。

热电阻的测温原理基于导体或半导体的电阻值随温度变化而变化这一特性来测量温度及与温度有关的参数。

热电阻大都由纯金属材料制成,应用最多的是铂和铜,现在已开始采用镍、锰和铑等材料制造热电阻。热电阻通常需要把电阻信号通过引线传递到计算机控制装置或者其它二次仪表上。

从热电阻的测温原理可知,被测温度的变化是直接通过热电阻阻值的变化来测量的,因此,热电阻体的引出线等各种导线电阻的变化会给温度测量带来影响。

扩展资料:

热电阻的测温原理与热电偶的测温原理不同的是,热电阻是基于电阻的热效应进行温度测量的,电阻体的阻值随温度的变化而变化的特性。

因此,只要测量出感温热电阻的阻值变化,就可以测量出温度。主要有金属热电阻和半导体热敏电阻两类。

工业上常用金属热电阻从电阻随温度的变化来看,大部分金属导体都有这个性质,但并不是都能用作测温热电阻。

参考资料来源:百度百科-热电阻

回答2:

“热电阻”这个概念比较广泛,如果热电阻是标准的PT100电阻,这个温度大约30摄氏度。
pt100温度传感器是一种常用的将温度变量转换为可传送的标准化输出信号的仪表。主要用于工业过程温度参数的测量和控制。带传感器的变送器通常由两部分组成:传感器和信号转换器。传感器主要是热电偶或热电阻;信号转换器主要由测量单元、信号处理和转换单元组成(由于工业用热电阻和热电偶分度表是标准化的,因此信号转换器作为独立产品时也称为变送器),有些变送器增加了显示单元,有些还具有现场总线功能。
PT100分度表:
-50度 80.31欧姆
-40度 84.27欧姆
-30度 88.22欧姆
-20度 92.16欧姆
-10度 96.09欧姆
0度 100.00欧姆
10度 103.90欧姆
20度 107.79欧姆
30度 111.67欧姆
40度 115.54欧姆
50度 119.40欧姆
60度 123.24欧姆
70度 127.08欧姆
80度 130.90欧姆
90度 134.71欧姆
100度 138.51欧姆
110度 142.29欧姆
120度 146.07欧姆
130度 149.83欧姆
140度 153.58欧姆
150度 157.33欧姆
160度 161.05欧姆
170度 164.77欧姆
180度 168.48欧姆
190度 172.17欧姆
200度 175.86欧姆

回答3:

热电阻基本是以1℃的温度变化对应电阻的0.4Ω阻值i变化,对于Pt100的热电阻,当其电阻值为112Ω时,其对应的温度是:t=(112-100)/0.4=30(℃)。由于热电阻对应温度变化的阻值并非完全线性的,这个计算只是一个比较接近的估算。

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