tips on attaching thermocouples - malcom...tips on attaching thermocouples if conductive here, the...
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![Page 1: Tips on attaching thermocouples - MALCOM...Tips on attaching thermocouples If conductive here, the spot (shown in red color) cannot be measured properly. An output of thermal profiling](https://reader030.vdocument.in/reader030/viewer/2022040111/5e3ff43a6e754e278479be1d/html5/thumbnails/1.jpg)
Tips on attaching thermocouples
Malcom Co., Ltd.
![Page 2: Tips on attaching thermocouples - MALCOM...Tips on attaching thermocouples If conductive here, the spot (shown in red color) cannot be measured properly. An output of thermal profiling](https://reader030.vdocument.in/reader030/viewer/2022040111/5e3ff43a6e754e278479be1d/html5/thumbnails/2.jpg)
The purpose of thermal profiling
●The difference of heat capacity of electronic components may
cause the temperature variation of soldering joints in soldering
process. As the lead-free solder paste tends to have higher
soldering temperature, precise control of each solder joint is
required.
● Monitoring the re-melting of reflowed solder joints on PCBs
![Page 3: Tips on attaching thermocouples - MALCOM...Tips on attaching thermocouples If conductive here, the spot (shown in red color) cannot be measured properly. An output of thermal profiling](https://reader030.vdocument.in/reader030/viewer/2022040111/5e3ff43a6e754e278479be1d/html5/thumbnails/3.jpg)
In the case of Wave soldering process
![Page 4: Tips on attaching thermocouples - MALCOM...Tips on attaching thermocouples If conductive here, the spot (shown in red color) cannot be measured properly. An output of thermal profiling](https://reader030.vdocument.in/reader030/viewer/2022040111/5e3ff43a6e754e278479be1d/html5/thumbnails/4.jpg)
(Set temperature ) (Melting point )
☆Eutectic solder 250℃~183℃=67℃
☆Sn-Ag-Cu Solder 250℃~217℃=33℃
☆Sn-Cu Solder 250℃~227℃=23℃
Temperature difference between solder bath and solder melting point
Narrower temperature window
compared with eutectic solders.
![Page 5: Tips on attaching thermocouples - MALCOM...Tips on attaching thermocouples If conductive here, the spot (shown in red color) cannot be measured properly. An output of thermal profiling](https://reader030.vdocument.in/reader030/viewer/2022040111/5e3ff43a6e754e278479be1d/html5/thumbnails/5.jpg)
How to attach thermocouples
Thermocouples are attached here.
![Page 6: Tips on attaching thermocouples - MALCOM...Tips on attaching thermocouples If conductive here, the spot (shown in red color) cannot be measured properly. An output of thermal profiling](https://reader030.vdocument.in/reader030/viewer/2022040111/5e3ff43a6e754e278479be1d/html5/thumbnails/6.jpg)
Tips on attaching thermocouples with
adhesive
Heat-
insulated
adhesive
TC
sensors
lead
High temperature solder is preferable to adhesive
![Page 7: Tips on attaching thermocouples - MALCOM...Tips on attaching thermocouples If conductive here, the spot (shown in red color) cannot be measured properly. An output of thermal profiling](https://reader030.vdocument.in/reader030/viewer/2022040111/5e3ff43a6e754e278479be1d/html5/thumbnails/7.jpg)
Tips on attaching thermocouples
Solder
Cupper sheet (to
fasten)
TC sensors
Fasten all with metallic material
![Page 8: Tips on attaching thermocouples - MALCOM...Tips on attaching thermocouples If conductive here, the spot (shown in red color) cannot be measured properly. An output of thermal profiling](https://reader030.vdocument.in/reader030/viewer/2022040111/5e3ff43a6e754e278479be1d/html5/thumbnails/8.jpg)
Ideal thermocouples
0.1φTC sensor 0.2tcopper
sheet
Spot-welded
sensors
![Page 9: Tips on attaching thermocouples - MALCOM...Tips on attaching thermocouples If conductive here, the spot (shown in red color) cannot be measured properly. An output of thermal profiling](https://reader030.vdocument.in/reader030/viewer/2022040111/5e3ff43a6e754e278479be1d/html5/thumbnails/9.jpg)
Tips on attaching thermocouples
If conductive here, the
spot (shown in red color)
cannot be measured
properly.
![Page 10: Tips on attaching thermocouples - MALCOM...Tips on attaching thermocouples If conductive here, the spot (shown in red color) cannot be measured properly. An output of thermal profiling](https://reader030.vdocument.in/reader030/viewer/2022040111/5e3ff43a6e754e278479be1d/html5/thumbnails/10.jpg)
An output of thermal profiling with the RC-50 -1
not solidified up to
here
![Page 11: Tips on attaching thermocouples - MALCOM...Tips on attaching thermocouples If conductive here, the spot (shown in red color) cannot be measured properly. An output of thermal profiling](https://reader030.vdocument.in/reader030/viewer/2022040111/5e3ff43a6e754e278479be1d/html5/thumbnails/11.jpg)
An output of thermal profiling with the RC-50 -2
![Page 12: Tips on attaching thermocouples - MALCOM...Tips on attaching thermocouples If conductive here, the spot (shown in red color) cannot be measured properly. An output of thermal profiling](https://reader030.vdocument.in/reader030/viewer/2022040111/5e3ff43a6e754e278479be1d/html5/thumbnails/12.jpg)
In the case of Reflow soldering process
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QFP
A B C
D
E
Probe holder
epoxy-acrylic resin
Silicone
Heat resistant
grease
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A measurement Output
![Page 15: Tips on attaching thermocouples - MALCOM...Tips on attaching thermocouples If conductive here, the spot (shown in red color) cannot be measured properly. An output of thermal profiling](https://reader030.vdocument.in/reader030/viewer/2022040111/5e3ff43a6e754e278479be1d/html5/thumbnails/15.jpg)
Enlarged data output Incorrect TC
attachment with a gap Heat
resistant
grease