Today's Message Index:
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1. 10:29 AM - Re: Re: Thermocouples: grounded or ungrounded (Robert L. Nuckolls, III)
2. 03:57 PM - Re: Re: Thermocouples: grounded or ungrounded (Paul Eckenroth)
3. 07:14 PM - Re: Re: Thermocouples: grounded or ungrounded (Robert L. Nuckolls, III)
Message 1
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| Subject: | Re: Thermocouples: grounded or ungrounded |
> Have you considered a single instrument and rotary
> selector switch to manually scan through the
> array of thermocouples?
. . . an option:
here's a rotary switch, 2 pole, 6 position
made by folks who used to set the gold standard
for consumer grade rotary switches
https://tinyurl.com/23fhurmc
here's a lot of 5, prefabricated thermocouples
3 meters each in length . . . price is
right.
https://tinyurl.com/7vjvny2d
Make your own grounded couples by crimping a PIDG
terminal on the business end. Cut the connector
off the other end so you can run the bundle through
the firewall.
Install crimp d-sub pins on the instrument end
with mating connector on your switch assembly.
If you need to pull the thermocouples back through
the firewall, just extract the pins from the
d-sub connector.
This array of materials combined a k-reading
instrument will give you access to 6 points
of interest in a minimum of space and $
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 2
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| Subject: | Re: Thermocouples: grounded or ungrounded |
Plan to attach two thermocouples to the stator with the stator attachment
bolts. There is also a thermocouple imbedded in one of the generator coils
by Revmaster, but the lead wires are solid and extremely thin so I'm not
anticipating a long life. I will also attach a thermocouple to the voltage
regulator. The most important temperature readings will be of the stator.
Unfortunately since I can't run the readings through the EFIS, I will not
have an alarm.I will look into a rotary switch. The grounds on my plane
are all connected to 2 forest of tabs fore and aft on the firewall with a
#4 wire to the engine, so I think that connecting the reader ground to this
grounding point would be the same as connecting directly to the engine.
Thanks for the comments.
Paul
On Tue, Jul 5, 2022 at 8:20 PM Robert L. Nuckolls, III <
nuckolls.bob@aeroelectric.com> wrote:
> At 03:53 PM 7/5/2022, you wrote:
>
> Bob, here are the links:
>
> Probes:=C3=82 =C3=82
> https://cdn.automationdirect.com/static/specs/psthermoprobebors.pdf
>
> Reader:=C3=82 =C3=82
> https://www.amazon.com/PEMENOL-Fahrenheit-Temperature-76F-999F-Thermocoup
le/dp/B07X37WH5Z/ref=asc_df_B07X37WH5Z/?tag=&linkCode=df0&hvadid=38
6775205645&hvpos=&hvnetw=g&hvrand=7435587142193397440&hvpone=&hvptw
o=&hvqmt=&hvdev=c&hvdvcmdl=&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 3
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| Subject: | Re: Thermocouples: grounded or ungrounded |
At 05:30 PM 7/6/2022, you wrote:
>Plan to attach two thermocouples to the stator
>with the stator attachment bolts.=C2 There is
>also a thermocouple imbedded in one of the
>generator coils by Revmaster, but the lead wires
>are solid and extremely thin so I'm not
>anticipating a long life.=C2 I will also attach a
>thermocouple to the voltage regulator.=C2 The
>most important temperature readings will be of
>the stator.=C2 Unfortunately since I can't run
>the readings through the EFIS, I will not have
>an alarm.I will look into a rotary switch.=C2 The
>grounds on my plane are all connected to 2
>forest of tabs fore and aft on the firewall with
>a #4 wire to the engine, so I think that
>connecting the reader ground to this grounding
>point would be the same as connecting=C2 directly to the engine.=C2 =C2
Suggestion attached . . .
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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