Today's Message Index:
----------------------
1. 09:14 AM - Re: Thermocouples: grounded or ungrounded (Paul Eckenroth)
2. 10:52 AM - Re: Re: Thermocouples: grounded or ungrounded (Robert L. Nuckolls, III)
3. 04:00 PM - Re: Re: Thermocouples: grounded or ungrounded (Paul Eckenroth)
4. 05:17 PM - Re: Re: Thermocouples: grounded or ungrounded (Robert L. Nuckolls, III)
5. 05:31 PM - Re: Re: Thermocouples: grounded or ungrounded (Charles Kuss)
Message 1
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| Subject: | Re: Thermocouples: grounded or ungrounded |
Thanks for the reply Bob. Unfortunately my GRT EFIS cannot read Thermocouples
except as used for EGT and CHT. Therefore I am using small inexpensive readers
off Amazon. I seriously doubt if they have any specialized circuitry other
than that require to give a basic reading of the thermocouple. Does the ground
loop have the potential of rendering the reading totally unusable or is it more
like a 5% loss of accuracy. The ungrounded probes are around twice as expensive
as the grounded probes. I would certainly be willing to consider a better
reader if it can be had in a small format. The Onex is a single seat very
small plane with limited panel space. Thanks for your help.
Paul
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=507411#507411
Message 2
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| Subject: | Re: Thermocouples: grounded or ungrounded |
At 11:13 AM 7/5/2022, you wrote:
>
>Thanks for the reply Bob. Unfortunately my GRT EFIS cannot read
>Thermocouples except as used for EGT and CHT. Therefore I am using
>small inexpensive readers off Amazon. I seriously doubt if they
>have any specialized circuitry other than that require to give a
>basic reading of the thermocouple. Does the ground loop have the
>potential of rendering the reading totally unusable or is it more
>like a 5% loss of accuracy. The ungrounded probes are around twice
>as expensive as the grounded probes. I would certainly be willing
>to consider a better reader if it can be had in a small format. The
>Onex is a single seat very small plane with limited panel
>space. Thanks for your help.
Okay, best bet is go grounded thermocouples PLUS
take your power ground wire for the instrument(s)
out to some handy spot on engine.
Got a link for these probes?
Bob . . .
Un impeachable logic: George Carlin asked, "If black boxes
survive crashes, why don't they make the whole airplane
out of that stuff?"
Message 3
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| Subject: | Re: Thermocouples: grounded or ungrounded |
Bob, here are the links:
Probes:
https://cdn.automationdirect.com/static/specs/psthermoprobebors.pdf
Reader:
https://www.amazon.com/PEMENOL-Fahrenheit-Temperature-76F-999F-Thermocouple
/dp/B07X37WH5Z/ref=asc_df_B07X37WH5Z/?tag=&linkCode=df0&hvadid=3867
75205645&hvpos=&hvnetw=g&hvrand=7435587142193397440&hvpone=&hvptwo
=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9006641&hvtargid
=pla-841393864259&ref=&adgrpid=77847887454&th=1
Thanks
Paul
On Tue, Jul 5, 2022 at 1:55 PM Robert L. Nuckolls, III <
nuckolls.bob@aeroelectric.com> wrote:
> At 11:13 AM 7/5/2022, you wrote:
>
> jeckenroth@nbn.net>
>
> Thanks for the reply Bob. Unfortunately my GRT EFIS cannot read
> Thermocouples except as used for EGT and CHT. Therefore I am using small
> inexpensive readers off Amazon. I seriously doubt if they have any
> specialized circuitry other than that require to give a basic reading of
> the thermocouple. Does the ground loop have the potential of rendering t
he
> reading totally unusable or is it more like a 5% loss of accuracy. The
> ungrounded probes are around twice as expensive as the grounded probes.
I
> would certainly be willing to consider a better reader if it can be had i
n
> a small format. The Onex is a single seat very small plane with limited
> panel space. Thanks for your help.
>
>
> Okay, best bet is go grounded thermocouples PLUS
> take your power ground wire for the instrument(s)
> out to some handy spot on engine.
>
> Got a link for these probes?
>
> Bob . . .
>
> Un impeachable logic: George Carlin asked, "If black boxes
> survive crashes, why don't they make the whole airplane
> out of that stuff?"
>
Message 4
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| Subject: | Re: Thermocouples: grounded or ungrounded |
At 03:53 PM 7/5/2022, you wrote:
>Bob, here are the links:
>
>Probes:=C2 =C2
><https://cdn.automationdirect.com/static/specs/psthermoprobebors.pdf>https:
//cdn.automationdirect.com/static/specs/psthermoprobebors.pdf
>
>Reader:=C2 =C2
><https://www.amazon.com/PEMENOL-Fahrenheit-Temperature-76F-999F-Thermocoupl
e/dp/B07X37WH5Z/ref=asc_df_B07X37WH5Z/?tag=&linkCode=df0&hvadid=3867
75205645&hvpos=&hvnetw=g&hvrand=7435587142193397440&hvpone=&hvptwo
=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9006641&hvtargid
=pla-841393864259&ref=&adgrpid=77847887454&th=1>https://www.amazon.c
om/PEMENOL-Fahrenheit-Temperature-76F-999F-Thermocouple/dp/B07X37WH5Z/ref=
asc_df_B07X37WH5Z/?tag=&linkCode=df0&hvadid=386775205645&hvpos=&hvne
tw=g&hvrand=7435587142193397440&hvpone=&hvptwo=&hvqmt=&hvdev=c&h
vdvcmdl=&hvlocint=&hvlocphy=9006641&hvtargid=pla-841393864259&ref=
&adgrpid=77847887454&th=1
Okay, how do you plan to attach the probes to the
stator . . . bolts? We used to weasel small t/c
wires under the stator windings of a motor.
How many total points to you plan to monitor?
Have you considered a single instrument and rotary
selector switch to manually scan through the
array of thermocouples?
Bob . . .
Un impeachable logic: George Carlin asked, "If black boxes
survive crashes, why don't they make the whole airplane
out of that stuff?"
Message 5
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| Subject: | Re: Thermocouples: grounded or ungrounded |
Paul, do you have a GRT EIS to go with your EFIS? If so, the EIS has the ca
pability to have auxiliary inputs added. You can hook additional thermocoup
les to take temperature of other items on the aircraft using those auxiliar
y inputs.
Sent from Yahoo Mail on Android
On Tue, Jul 5, 2022 at 6:11 PM, Robert L. Nuckolls, III<nuckolls.bob@aero
electric.com> wrote: At 11:13 AM 7/5/2022, you wrote:
--> AeroElectric-List messageposted by: "Paul Eckenroth" <jeckenroth@nbn.ne
t>
Thanks for the reply Bob.=C2- Unfortunately my GRT EFIS cannot readThermo
couples except as used for EGT and CHT.=C2- Therefore I am usingsmall ine
xpensive readers off Amazon.=C2- I seriously doubt if theyhave any specia
lized circuitry other than that require to give a basicreading of the therm
ocouple.=C2- Does the ground loop have thepotential of rendering the read
ing totally unusable or is it more like a5% loss of accuracy.=C2- The ung
rounded probes are around twice asexpensive as the grounded probes.=C2- I
would certainly be willing toconsider a better reader if it can be had in
a small format.=C2- TheOnex is a single seat very small plane with limite
d panel space.=C2-Thanks for your help.
=C2- Okay, best bet is go grounded thermocouples PLUS
=C2- take your power ground wire for the instrument(s)
=C2- out to some handy spot on engine.
=C2- Got a link for these probes?
=C2- Bob . . .
=C2- Un impeachable logic: George Carlin asked, "If blackboxes
=C2- survive crashes, why don't they make the whole airplane
=C2- out of that stuff?"
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