Shenzhen Grande Electronic Linkedin Page
Shenzhen Grande Electronic Co., Ltd logo
E-mail us for a Quote:
sales88@greattong.com
Call us now:
+86-755-83261869

Technical Article


PCB Assembly: How to attach a thermocouple to a target PCB?

Time:2017-05-22 13:52:38 Click:

It is important to monitor the temperature during the PCB Assembly SMT reflow process, especially for LEAD-Free processes. The components can suffer excessive thermal shock very easily. A thermocouple can be attached to a target circuit board to obtain real-time thermal-time data. 

In order to obtain reliable data from a thermocouple, the thermocouple junction must have direct and reliable thermal contact with the PCB surface, otherwise only hot air temperature is measured where there is a 2~10°C difference with actual board temperature. 

There are many ways to attach a thermocouple to a PCB such as, high-temperature solder, polyimide Kapton tape, aluminum tape and epoxy. 

High-Temperature (HT) Solder
In general, we need the melting point to exceed 290°C so that the solder will not melt (and thereby loosen the thermocouple) during the reflow process. This type of solder has good heat conductivity even when the thermocouple junction is slightly off the surface of the circuit board. It provides rigid mounting performance for the test circuit board. 

Kapton tape
High temperature adhesive tape, such as Kapton tape, can be easily used on any surface. But the tape will get loose when it attains a high temperature, so it is challenging to attach a thermocouple to board surface rigidly using Kapton tape. 

Aluminum tape 
Same as Kapton, but aluminum tape has better thermal conductivity. 

Epoxy
Epoxy is very good at securing thermocouple conductors to the profile board, but it is also much more difficult tto remove after the measuring has been completed. 

Overall, HT solder and Kapton tape are the better choices.

Previous:PCB Assembly: How the modern solder reflow oven works?

Next:How to create a Centroid File from Eagle, Altium and ORCAD/ALLEGRO?


Request an Official Quote

Questions

E-MAIL

File Upload

Upload a list of files

    Please upload your Gerber files and BOM. You can upload an unlimited number of files as long as the total size of all files does not exceed 20 MB. To ensure you receive your official quote in less than 24 hours, please include the quantity of circuit boards for which you would like a quote.

    If you require that we sign a Non-Disclosure Agreement (NDA), please send it to us prior to sending your files and we will be happy to accommodate.

     
    Home About us Services Quality Pb-Free News Contact us


    Copyright ® 2017,Shenzhen Grande Electronic Co., Ltd. All Rights Reserved. 中文站 Sitemap