Electronics > Metrology

Proper way of connecting thin film PT1000 sensors

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miro123:
I'm strugling to get decent& long term stable  electrical connection of PT100/1000 sensors.

https://nl.mouser.com/datasheet/2/619/Heraeus_Ni_LeadExtension_EN-2936545.pdf

Is seems that their end in Nickel wire
- Soldering with aggressive flux seems to me the wrong way - I've achieved  some result - but the solder connection lock bad - I have doubt about long term stability, What will be the connection resistance  after several years?
 - I did not tried any press-fit connection
My question is - what is the proper way to make a wire connection with those sensors? Is there any application note on this subject

thm_w:
The ones I've used are silver or gold plated: https://www.te.com/commerce/DocumentDelivery/DDEController?Action=showdoc&DocId=Data+Sheet%7FPTF-FAMILY%7FA3%7Fpdf%7FEnglish%7FENG_DS_PTF-FAMILY_A3.pdf%7FNB-PTCO-045

If you want to solder to nickel then yes you need to use a very aggressive flux, maybe try another type or get plated leads.

TUMEMBER:
Pt100/Pt1000 sensors are generally bonded by electric arc welding. The remelting of the weld is then the most durable and there is no problem with the "solderability" of materials.

mzzj:

--- Quote from: TUMEMBER on December 03, 2022, 06:30:15 am ---Pt100/Pt1000 sensors are generally bonded by electric arc welding. The remelting of the weld is then the most durable and there is no problem with the "solderability" of materials.

--- End quote ---
Or laser. Not very practical for home use.  ::)

Electric arc welding against carbon(graphite) electrode is pretty easy at home shop if you have enough wire lenght on the sensor and can "live with" twisted T splice joint.
All you need is suitable power supply and piece of graphite(carbon brush from electric motor or carbon rod from welding store)
Some of the commercial thermocouple welders are just that. https://fi.farnell.com/labfacility/xf-1250-far/thermocouple-welder-5-10-min-250vac/dp/2897470

branadic:
The answer is, it depends ;)
First question to answer is, at what temperatures you want to operate the temperature sensor. Note that in case of soldering the melting point of your solder should be 100 K above maximum operating temperature for reliability reasons. Leaded solder is available with a melting point of around 300 °C, so your maximum continuous operating temperature is 200 °C here.
Beyond that soldering is no longer the way to go, without special solder and equipment. In such cases welding is most commonly used, since crimping/clamping tends to loose contact force over time and temperature.

-branadic-

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