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guojinming金蟲 (正式寫手)
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[交流]
【請教】測量IR 爐子的測溫線（熱電偶）J型K型的區(qū)別？
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請問熱電偶，J型與K型的有什么區(qū)別？ 材質(zhì)不同？還是形狀不同？ 貌似材質(zhì)不同？測溫有區(qū)別嗎？ 多謝！ |
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hui_jun_li
木蟲 (正式寫手)
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mselxp(金幣+2,VIP+0):謝謝！ 5-23 17:51
mselxp(金幣+2,VIP+0):謝謝！ 5-23 17:51
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Type K (chromel–alumel) is the most common general purpose thermocouple. It is inexpensive and available in a wide variety of probes. They are available in the −200 °C to +1350 °C range. The type K was specified at a time when metallurgy was less advanced than it is today and, consequently, characteristics vary considerably between examples. Another potential problem arises in some situations since one of the constituent metals, nickel, is magnetic. One characteristic of thermocouples made with magnetic material is that they undergo a step change when the magnetic material reaches its Curie point. This occurs for this thermocouple at 354 °C. Sensitivity is approximately 41 µV/°C. Type J (iron–constantan) is less popular than type K due to its limited range (−40 to +750 °C). The Curie point of the iron (770 °C) causes an abrupt change to the characteristic and it is this that provides the upper temperature limit. Type J thermocouples have a sensitivity of about 50 µV/°C |
2樓2009-05-23 17:47:31
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