"Gord Beaman" wrote in message
...
Jim Yanik wrote:

(B2431) wrote in
:

Jim Yanik wrote:

"Well,then it violates basic physics.If you have two voltage sources
of
slightly different voltages,currents DO flow between them.That's a
basic principle. And bimetal TCs are simply millivolt voltage
sources."

Yes Jim, what you say is true but it's 'allowed' in this (and
other) cases because the voltage output, although in the
millivolt range, is 'soft'. so the current is extremely low, they
merely 'average' themselves.

You certainly couldn't parallel two different voltage sources IF
they were 'hard' because huge currents would flow. So on a T-56
engine they do indeed parallel many thermocouples. (I forget how
many now, but there's a bunch) Half are used for the FCU and half
for the Temperature Datum System.
--

-Gord.

18 thermocouples, 3 in each can, each thermocouple has 4 wires connected to
it, 2 white, 2 green. 2 wires send signals to the TD amp, the other 2 to the
TIT gauge in the flight station via a terminal block.

Scet