Joe,
Yes, GRT does have ready-made connector terminations for their EGT and CHT
sensors. They use a 20-ton press with a $6,000 tool head to crimp the pins
onto the thermocouple wires. When I bought my EIS 4000, they did not have
that option available. I don't have access to that tooling. I just have
the hand-operated ratchet crimper. The wires, I have now, do not have any
terminations on them. So, I am doing a work around to hookup what I have
now. I am going with the European barrier strips from Radio Shack to
terminate the thermocouple wires at the instrument panel, then use copper
wire to the D-sub connector. I will twist the wire pairs to help cut down
on radio frequency interference to the high impedance EIS 4000 front end.
Galvanometers are somewhat immune from rfi.
Solder on copper wires and brass works fine. Solder on iron and constantan
connections does create a thermocouple that will mess with the calibration
for the factory thermocouple.
Sid Wood
Tri-gear KR-2 N6242
Mechanicsville, MD, USA
smw...@md.metrocast.net
--
Guys,I am totally confused. I thought that the thermal couples that i
received from GRT (i.e. exhaust and head temp) were premade with ends
installed - They are not to be cut or modified in any way. The kit includes
extra terminals to cut and terminate the wires from the instrument to the
correct install length and then connect to the thermal couple wire. Why are
we talking about terminating the thermal couple wires, What did i miss?Joe
Horton,Coopersburg, PA.
-- Forwarded Message -
On 10/5/2011 8:46 AM, smwood wrote:
> Solder does not stick to well on them and even
> if you did solder the pins, you create a dissimilar metal joint that
> messes
> with the thermocouple calibration
Soldering does not create a dissimilar metal connection as such, but
creates an alloy at the junction of the two metals, which provides a
reliable conductive path. I have a hard time believing that the
calibration error introduced by this junction would be anywhere near
the error introduced by the galvanometer (meter movement) it is
normally displayed on (considering that there are solder joints along
the meter path INSIDE the unit). What is the accuracy of the
thermocouple itself, 2-5%? Perhaps less accurate?
--
Glenn Martin
Biloxi, MS
