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
