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Industry Information
Application Principles About Thermal Resistance
2011-10-9 9:49:36

热电阻 是中低温区最常用的一种温度检测器。 Generally speaking, the thermal resistance is the most commonly used type of temperature detector in the low and medium temperature areas. Its main features are high measurement accuracy and stable performance. 其中 铂热电阻的测量精确度是最高的,它不仅 广泛应用于工业测温,而且 被制成标准的基准仪。 The measurement accuracy of platinum thermal resistance is the highest. It is not only widely used in industrial temperature measurement, but also made into a standard reference instrument.
1 . Thermal resistance temperature measurement principle and material
,它会 随温度的增加而增加这一特性来进行温度测量的。 Thermal resistance temperature measurement is based on the resistance value of the metal conductor , which will increase the temperature as the temperature increases. 部分是 由纯金属材料制成 ,目前应用最多的是铂和铜, 但是 现在已开始采用甸、镍、锰和铑等材料 制造热电阻 Most of the thermal resistors are made of pure metal materials. Platinum and copper are currently the most widely used , but materials such as copper , nickel, manganese, and rhodium have been used to make thermal resistors .
2 . Structure of thermal resistance
常用热电阻感温元件的结构及特点。 (1) Proficient thermal resistance: The structure and characteristics of thermal resistance temperature sensing elements commonly used in industry . ,被测温度的变化 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。 It can be known from the temperature measurement principle of the thermal resistance that the change of the measured temperature will be directly measured by the change of the resistance value of the thermal resistance. Therefore, changes in the resistance of various wires such as the lead wire of the thermal resistance body will give the temperature measurement band To influence. 消除引线电阻的影响 般采用三线制或 四线制。 In order to eliminate the influence of the lead resistance, a three-wire system or a four-wire system is generally used .
:铠装热电阻是由感温元件、引线、绝缘材料、不锈钢套管组合而成的坚实体,它的外径一般为 Φ 2 - Φ 8mm (2) Armored thermal resistance : Armored thermal resistance is a solid body composed of a temperature sensing element, a lead, an insulating material, and a stainless steel sleeve. Its outer diameter is generally Φ 2 - Φ 8mm .

以下 优点: Compared with ordinary thermal resistance, it has the following advantages:
没有 空气隙,热惯性上,测量滞后小; ①Small volume, no air gap inside , small measurement hysteresis in thermal inertia;
Good mechanical properties, vibration resistance and impact resistance;
弯曲,便于安装 Can be bent for easy installation ;
Long service life.
感温元件 由特殊处理的电阻丝材 绕制 而成的 ,紧贴在温度计端面。 (3) End surface thermal resistance: The temperature sensing element of the end surface thermal resistance is wound from the specially processed resistance wire material , and it is closely attached to the end surface of the thermometer. 一般 轴向热电阻相比,能 更正确 和快速 反映被测端面的实际温度,适用于测量轴瓦和其他机件的端面温度。 Compared with the general axial thermal resistance, it can more accurately and quickly reflect the actual temperature of the measured end face, and is suitable for measuring the end face temperature of the bearing pad and other parts.
通过特殊结构的接线盒, 将它的 外壳内部爆炸性混合气体因受到火花或 电弧等影响而发生的爆炸局限在接线盒内,生产现场不会引 爆炸。 (4) Explosion-proof thermal resistance: Explosion-proof thermal resistance is a junction box with a special structure. The explosion of the explosive mixed gas inside its casing is limited to the junction box due to the influence of sparks or arcs. The production site Does not cause an explosion. - B3c 级区内具有爆炸 危险场所的温度测量。 Flameproof thermal resistance can be used for temperature measurement in explosive hazardous areas in Bla - B3c class area . 如果 采用焊接修理,焊后要校验合格后才能使用。 It is necessary to change the length of the resistance wire to affect the resistance value of the resistor body for the open circuit repair. Therefore, it is better to replace the new resistor body. If welding repair is used, it can only be used after verification after welding.

3 Composition of thermal resistance temperature measurement system
测温系统一般由热电阻、连接导线和显示仪表等 部分 组成。 (1) Thermal resistance German temperature measurement system generally consists of thermal resistance, connecting wires and display instruments . 必须注意以下两点: You must pay attention to the following two points when using :
的分度号 和显示仪表的分度号必须一致 ① The graduation number of the thermal resistance and the graduation number of the display instrument must be the same
In order to eliminate the influence of the resistance change of the connecting wire, a three-wire connection method must be used.