i am trying to join the ends of the thermocouple wire and glue it to
the nitinol wire...the material used to join it should be able to
withstand the temeperature passing through the nitinol wire...we get
fused end thermocouple but its costly...can anyone help me with this
Virginia Commonwealth University
The theromcouple welder is very simple. You should be able to design and
build one yourself. In principal it works this way:
Connect the instrument side of the thermocouple wire to a large
capacitor, perhaps 50 MFd, and then charge it to say 200 Volts. Then
disconnect the charger.
At the sensing end, move the two thermocouple wires together until they
touch. The resulting spark melts the wires together and, voila, a
Of course, do a good engineering job on your mechanism so you don't
blind yourself or electrocute yourself.
The value of the capacitor and the voltage level can be determined by
experiment to make a nice weld on the size and type of thermocouple wire
On Thu, 05 Jan 2006 21:02:53 GMT, Al Gave us:
Then, one should still create a calibration chart using an already
calibrated standard. That way, one knows what one's offsets are at
any given temperature.
In addition to what others have said, also keep in mind how the *other* end
of the thermocouple wire is to be connected. Just connecting to a terminal
board creates, in effect, two other thermocouples. The temperature at that
junction needs to be known and adjusted for.
Some direct-reading thermocouple meters will do this for you internally.
But if using 'generic' mvolt metering, the 'cold junction' temperature needs
to be considered.