Printed Circuit Board Assembly & PCB Design SMT Electronics Assembly Manufacturing Forum

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Thermo couple attachment

#33275

Thermo couple attachment | 18 March, 2005

Does anyone know of any studies that have been done on different types of thermo couple attachment?

In particular I am interested in the temperature differences that are seen with the different methods of attachment.

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KEN

#33279

Thermo couple attachment | 18 March, 2005

KIC Thermal Its on the web site (just root around)

There is an excellent white paper on comparisons of the major attachment methods. Solder, kapton, epoxy etc.

Cameron S. is the author.

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ams

#33304

Thermo couple attachment | 21 March, 2005

I have done few thermocouples using high lead solder, silver epoxy that is used for die attach purposes and some X - non conductive material. Though all materials show a slight variation in temperatures (3 to 5 degree C), the dwell time at peak is quite significant for all the materials. Material X being highest and high lead solder being lowest for the same reflow furnace settings. I guess we may accept the temperature variation of 5 degree C and fix the spec limits for T. But we can not fix the spec limit for the dwell time should you have a situation to apply all the materials for TC assembly. I strongly recommend using high lead solder for the TC joints. Also you need to secure the TC firmly, so that repair works are avoided. Temperaature and other readigs are not the same as before after repair. AMSTech

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py (france)

#33324

Thermo couple attachment | 21 March, 2005

two ways to attach a thermocouple first with hig temperature alloy (for example Sn Pb90) it's not very easy to inclose the thermocouple in the solder because the wetability of the thermocouple is awfull. the second one: attach the wire of the thermocouple with epoxy smt glue, and keep your classical alloy .

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bman

#33330

Thermo couple attachment | 21 March, 2005

Where are people getting their high temp solder? I've found it before, but the price and minimum quantities were ridiculous.

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#33331

Thermo couple attachment | 21 March, 2005

Doesn't everyone get it from their regular paste supplier?

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#33332

Thermo couple attachment | 21 March, 2005

Try Radio Shack

We have no significant financial interest/arrangement or affiliation with any organization/institution whose products or services are being discussed in this thread.

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KEN

#33335

Thermo couple attachment | 21 March, 2005

Let's examine some scenarios: What if...

...No solder sample available and you must profile a "live" board (rules out epoxy). ...Lead free build (rules out lead bearing alloys)

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Guest

#33458

Thermo couple attachment | 30 March, 2005

Aluminium tape adheres quite well and is not intrusive. I believe it's mentioned in KIC's articles as a good alternative to high-temp solder.

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URL

#33460

Thermo couple attachment | 30 March, 2005

Someone sells the T-couples that are in a rigid tube and the base attaches to the edge of the bord. They have an adjustment nut on em you can adjust to spring load the T-couple on the are you need. They do produce a wavey profile from the part expanding, but gives you a quick way to measure without destroying a board.

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