Thermal resistance is the use of platinum wire resistance changes as the temperature of the basic principles of design and production, according to 0 ℃, the resistance value R (℃) in size divided into 10 ohms (indexing number Pt10) and 100 ohms (indexing number Pt100), etc., temperature range is -200 ~ 850 ℃ .10 ohm platinum resistance temperature is the original thick platinum wire around the system, the heat resistance is better than 100 ohm platinum resistance, as long as used for temperature above 650 ℃: 100 ohm platinum RTD is mainly used for temperature below 650 ℃, though can also be used above 650 ℃ temperature, but temperature does not allow more than 650 ℃ have A-level error. 100 ohm platinum resistance resolution than 10-ohm platinum resistance is 10 times the resolution, the requirements of the secondary instrument corresponding to an order of magnitude, so the temperature below 650 ℃ temperature should try to use 100 ohm platinum RTD .
Thermal resistance can be divided into industrial platinum resistance and sheathed platinum resistance. Industrial platinum resistance thermometers, also called the assembly platinum thermal resistance, that is, platinum resistance temperature sensing element assembly of welding on the lead metal tube closed at one end or ceramic tube, and then install the junction box is made; sheathed platinum resistance is platinum thermal resistance elements, the transition leads, insulated stainless steel tube powder assembled in the mold and then by pulling the overall implementation, with a solid, seismic, and orbit, diameter small, and easy to use installation.
热电阻是利用铂丝的电阻值随着温度的变化而变化这一基本原理设计和制作的，按0℃时的电阻值R(℃)的大小分为10欧姆（分度号为Pt10）和100欧姆（分度号为Pt100）等，测温范围均为-200~850℃.10欧姆铂热电阻的感温原件是用较粗的铂丝绕制而成，耐温性能明显优于100欧姆的铂热电阻，只要用于650℃以上的温区：100欧姆铂热电阻主要用于650℃以下的温区，虽也可用于650℃以上温区，但在650℃以上温区不允许有A级误差。100欧姆铂热电阻的的分辨率比10欧姆铂热电阻的分辨率大10倍，对二次仪表的要求相应地一个数量级，因此在650℃以下温区测温应尽量选用100欧姆铂热电阻。
热电阻可以分为工业铂热电阻和铠装铂热电阻。工业铂热电阻也叫装配铂热电阻，即是将铂热电阻感温元件焊上引线组装在一端封闭的金属管或陶瓷管内，再安装上接线盒而成；铠装铂热电阻是将铂热电阻元件，过渡引线，绝缘粉组装在不锈钢管内再经模具拉实的整体，具有坚实，抗震，可绕，线径小，使用安装方便等优点。
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Resistanse wire
