Electronics International MVP-50T - Manual (Page 46)

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thermocouple wire. A pull test can be performed to test the crimp. A ratcheting crimp tool from Tyco
(P/N: 91503-1) will crimp both TC and Tin Copper Wire. All crimps must pass a 3 to 4 pound pull test
to be considered reliable.
To install a D-sub pin onto a 20 ga. Tin Copper Wire, perform the following steps:
A. Strip the insulation back 1/8.” Be careful not to knick the wire.
B. Insert the pin into the 24 ga. D-sub Pin Crimper. The crimpers
have two cavities; the smaller one is used to crimp the bare wire
and the slightly larger one is used to crimp around the insulation.
Check that the pin is inserted into the crimpers properly. Also, the
ears on the pin must be facing into the center of the crimp tool
cavity to produce a good crimp. If the pin rotates even a little
during crimping, the connection will be unreliable.
C. Insert the wire into the pin. Check that the insulation is in the
strain relief crimp area but not in the bare wire crimp area. Crimp
the pin onto the wire. A good crimp is very important. Poor
crimps will cause jumpy readings and are the biggest source
of problems.
D. Pull Test: Pull (approximately 3 to 4 pounds) on the wire near the connector with one hand while
holding the connector with the other hand. If the wire pulls out of the connector, you must start over
using a new connector.
E. A well soldered connection at the crimp can be reliable. Soldering a TC wire requires a lot of heat
to produce a good solder connection. Also, when soldering a TC wire each wire should be scraped
with a knife to expose fresh metal just before crimping and applying solder. Fluxing the TC wire can
also help. Do not use acid core solder or acid flux.
Crimp Cavity
Pin Ears face Down
End View
of
the D-sub Pin in the Crimp Tool
Insulation
E.I. D-sub Pin
Bare Wire