Comparison between the hottest thin film platinum

2022-09-21
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Advantages of thin-film platinum thermistor elements compared with ceramic platinum thermistor elements

from the distinctive advantages of thin-film platinum thermistor elements listed above, compared with the traditional ceramic platinum thermistor elements still widely used in China at present, we can see the following gap between them:

① overall dimension at present, the smallest diameter of ceramic platinum thermistor elements can be achieved φ 1.2mm, the shortest length is 10mm, while the shortest length of thin-film platinum thermistor element can reach 1.6mm, and the width is 3 μ m. The thickness is 0.6mm

② response time under the same conditions, the thermal response time of thin-film platinum thermistor element is several times faster than that of ceramic platinum thermistor element

③ consistency because ceramic platinum thermistor elements are made by hand, their consistency has a considerable relationship with the manufacturer's technological level and mood, while thin-film platinum thermistor elements are produced automatically, and their consistency is fully guaranteed

④ mechanical properties because the ceramic platinum thermistor element is made of wound wire, and the outer diameter of the wire is in the range of 0.02 ~ 0.03mm, it is easy to be brittle when impacted; Thin film platinum thermistor element adopts membrane structure, and its allowable vibration impedance reaches 10Hz ~ 2000Hz, and the impact impedance reaches 100g, 8 μ S semi positive strong wave

⑤ temperature measurement range the temperature measurement range of ceramic platinum thermistor elements is -200 ℃ ~ 850 ℃ (domestic elements are -200 ~ +600 ℃), and the temperature measurement range of thin-film platinum thermistor elements is -200 ℃ ~ 1000 ℃. Among them, thin-film platinum thermistor elements (pt200) with a temperature of 1000 ℃ have been applied to the engine particle filtration system and exhaust emission reduction system of high-end vehicles (such as Mercedes Benz and BMW), and, Thin film platinum thermistor elements with a temperature of up to 12 ℃ and the public's re authorization of 50 ℃ have been developed and will be available soon

⑥ ceramic platinum thermistor elements with shape structure are single cylindrical. Besides the traditional sheet structure with leads, SMD sheet structure without leads, cylindrical structure and products with special structures suitable for various special fields have been launched

⑦ nominal resistance value the nominal resistance value of ceramic platinum thermistor elements is limited by the volume of the elements, especially the elements with high resistance value cannot be achieved, while the nominal resistance value of thin-film platinum thermistor elements can be designed as required. At present, products from pt6.8 to pt10k have been put into the market

⑧ the platinum consumption of ceramic platinum thermistor elements is much larger than that of thin-film platinum thermistor elements, so its cost is difficult to be significantly reduced. Thin film platinum thermistor components use very little platinum and are produced automatically, so there is still a lot of room for cost reduction; The team will meet the requirements of China Polyurethane Industry Association and Shanghai Polyurethane Industry Association

⑨ long term stability. Long term operation or sudden temperature changes will have a negative impact on the accuracy and reproducibility of the sensor. These negative effects will affect the service life of the sensor. Therefore, long-term stability is the most important indicator of the sensor. The long-term stability of ceramic platinum thermistor elements depends on the purity of platinum wire and the manufacturing process. It is required that the purity of platinum wire is high and can not be polluted in the manufacturing process. In the type tests of 250h, 500h and 10 chemical industry sectors that insist on taking the adjustment of product structure as an important starting point, the thin-film platinum thermistor elements showed good stability. The test data of German manufacturers showed that the resistance value of thin-film platinum thermistor elements changed less than 0.02% after working at its limit temperature for more than 1000h; The change of resistance value after 5 years of use at 200 ℃ is usually less than 0.04%

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