nuckolls.bob(at)aeroelect
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 Posted: Sun Aug 07, 2022 10:56 am Post subject: "Engine Monitors" article |
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At 08:54 AM 8/7/2022, you wrote:
| Quote: | --> AeroElectric-List message posted by: "user9253" <fransew(at)gmail.com>
The September 2022 issue of Kitplanes Magazine has an article titled, "Engine Monitors".
On page 28 it says, "JPI uses "K" type or what is referred to as grounded probes. |
"K" and "grounded" are not synonymous.
You can ground ANY type of thermocouple wire . . . of which
there are perhaps a dozen.
| Quote: | | These are faster than "J" type or ungrounded probes." |
Response time is related to how well the active junction
of the thermocouple is thermally 'joined' with the
medium for which you have a curiosity as to temperature.
A grounded thermocouple is generally fabricated with
the t/c junction crimped or welded to the inside of
a metal tube which makes up the body of the probe.
Ungrounded are a bit fussy to fabricate for
responsive performance but not terribly so.
See https://tinyurl.com/2h3a4ajf
| Quote: | What does the type of metal have to do with whether or not the
probe is grounded? |
not a thing
| Quote: | | Is the "speed" of a thermocouple a concern? |
If one uses an EGT display to adjust mixture,
then a more responsive display is helpful. But
I can't imagine it being a show stopper should
one find a really good deal on some insulated
probes.
The act of fine-tuning mixture is an en-route
procedure where one is generally not in a hurry.
In any case, the differences are on order of
one or two seconds.
Scroll down in the url cited above for an
illustration of various t/c configurations.
Bob . . .
Un impeachable logic: George Carlin asked, "If black boxes
survive crashes, why don't they make the whole airplane
out of that stuff?"
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