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test_equipment:soldering_thermo_couples [2013/01/08 19:00] (current) |
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+ | ====== Soldering Thermo Couples ====== | ||
+ | Let's talk a little about thermocouple wire alloys: | ||
+ | |||
+ | There are about 6 principal thermocouple pairs in common use: | ||
+ | |||
+ | * Type E - CR-CN | ||
+ | * Type J - Fe-CN | ||
+ | * Type K - CR-AL | ||
+ | * Type R - Pt/13/Rh-Pt | ||
+ | * Type S - Pt/10/Rh-Pt | ||
+ | * Type T - Cu-CN | ||
+ | |||
+ | Where, | ||
+ | |||
+ | * Cu == Copper | ||
+ | * CR == Chromel | ||
+ | * CN == Constantan (53%Cu, 45%Ni) | ||
+ | * Al == Alumel | ||
+ | * Fe == Iron | ||
+ | * Pt/10/Rh == Platinum + 10% Rhodium | ||
+ | * Pt/13/Rh == Platinum + 13% Rhodium | ||
+ | * Pt == Platinum | ||
+ | |||
+ | Each of these alloy combinations makes a dandy thermocouple, but each also has unique characteristics relative to soldering with conventional tin/lead solders, or welding. | ||
+ | |||
+ | * Type E won't solder | ||
+ | * Type J solders nicely | ||
+ | * Type K won't solder | ||
+ | * Type R won't solder | ||
+ | * Type S won't solder | ||
+ | * Type T solders nicely | ||
+ | |||
+ | Basically any alloy that has significant quantities of Chromium, Platinum, Rhodium, or Aluminum will be difficult to solder. | ||
+ | |||
+ | Copper solders nicely, iron solders nicely, nickel pretty well.., | ||
+ | |||
+ | -Chuck Harris |