Today's Message Index:
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1. 06:54 AM - "Engine Monitors" article (user9253)
2. 11:56 AM - Re: "Engine Monitors" article (Robert L. Nuckolls, III)
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| Subject: | "Engine Monitors" article |
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.
These are faster than "J" type or ungrounded probes."
What does the type of metal have to do with whether or not the probe is grounded?
Is the "speed" of a thermocouple a concern?
There seems to be some misconceptions about grounding in the article also.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=507621#507621
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| Subject: | Re: "Engine Monitors" article |
At 08:54 AM 8/7/2022, you wrote:
>
>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.
>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
>What does the type of metal have to do with whether or not the
>probe is grounded?
not a thing
>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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