Today's Message Index:
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1. 04:29 AM - Re: CHT/EGT connectors (racerjerry)
2. 07:28 AM - Re: CHT/EGT connectors (rsmith52)
3. 08:45 AM - Re: CHT/EGT connectors (Eric Page)
4. 05:19 PM - Re: CHT/EGT connectors (Robert L. Nuckolls, III)
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| Subject: | Re: CHT/EGT connectors |
I'm no expert, but I guess the A & P was speaking about errors introduced by an
extra "cold junction" introduced into the system. My GUESS is that the error
would be insignificant as long as the "junction" temperature was not too far
from ambient.
Might be interesting to do a side by side experiment .
We are generally not too interested in absolute accuracy with CHT / EGT readings.
--------
Jerry King
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| Subject: | Re: CHT/EGT connectors |
This is on my Experimental. I have no idea what brand of PIDG Alcor used. The ones
I purchased look identical. The A/P said these connectors are used on all
new planes.
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| Subject: | Re: CHT/EGT connectors |
rsmith52 wrote:
> I have no idea what brand of PIDG Alcor used. The ones I purchased look identical.
PIDG (Pre-Insulated Diamond Grip) (https://www.te.com/usa-en/products/brands/pidg.html?tab=pgp-story) is a trademark of TE Connectivity. They're the only manufacturer of genuine PIDG terminals.
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| Subject: | Re: CHT/EGT connectors |
At 09:45 AM 12/9/2023, you wrote:
>
>There is a local A/P that insists that special connectors are needed
>for CHT/EGT probes to prevent dissimilar metal problems affecting
>the readings. My Alcor probes have PIDG ring terminals and I
>purchased PIDG ring terminals for making connections to the
>thermocouple wires, with the provided screws and nuts. The PIDG
>terminals all look like they are made from the same material. I'm
>thinking I don't need to spend about a $100 for these special
>Prosense Type K Thermocouple connectors.
You're right. If you're not needing ease of de-mating
for maintenance, the PIDG/nut-n-screw will produce
error free performance. You could also consider PIDG/
M-F FastOn terminals. Of course, the junctions should
be covered with heat-shrink. This is why you can take
a thermocuple pair through a 'generic' connector (4-quad
crimped pins preferred.
To be sure, you're mechanic is half right . . . dissimilar
metals used in the thermocouple conductor WILL generate
parasitic, thermally dependent couples which CAN generate
errors in measurement of the TARGET couple on the engine.
However, the parasites can be arranged in PAIRS and
electrically polarized to oppose each other;
the errors are washed out. This presumes that
your t/c wire on BOTH sides of the joint.
No 'special' connectors necessary. However, there
ARE inexpensive connectors specifically designed
to mate T/C wire runs.
https://tinyurl.com/ymjvhnhw
Widely available from electronics and instrument
supply houses. These can be secured with an
short hunk of heatshrink.
Bob . . .
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