Today's Message Index:
----------------------
1. 10:54 AM - Re: 4 light wig-wag (Eric M. Jones)
2. 06:37 PM - Re: CHT challenge . . . (Bill Bear)
3. 06:39 PM - Re: CHT challenge . . . (Bill Bear)
Message 1
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| Subject: | Re: 4 light wig-wag |
I supply Wig-Wags for four-light systems, but usually where (for example) two 75W
lamps on each wing. The problem is that two lamps in parallel on each wing
are half the cold resistance, so a surge suppressor has to be used on each lamp.
But I also supply Wig-Wags for single light Europas and other single front- lighted
systems. This is done by powering only one lamp while doubling the frequency.
When I first tried this, I doubled it would work because of warm-up and cool-down
delays but it seems to work quite well. The FDA has no guidelines for
this.
One thing should be mentioned regarding Wig-Wags...They are the very best protection
against birdstrikes (a study has determined).
Regarding LEDs...use them now! If you don't want to spend the money with aviation
suppliers, use the auto and off-road vendors. There are plenty of lower cost
suppliers. and plenty of plug-and-play units.
As for wig-wagging lamp that are very close together, it is hard to do, but some
locomotives use one lamp and just swing it to and fro. Seems to work.
--------
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones(at)charter.net
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=462008#462008
Message 2
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| Subject: | Re: CHT challenge . . . |
Thanks, Bob,
Your discussion cleared up my concern - very helpful.
Bill
On Oct 31, 2016, at 9:42, Robert L. Nuckolls, III
<nuckolls.bob@aeroelectric.com> wrote:
> At 01:45 AM 10/31/2016, you wrote:
> Hi Bob,
>
> I found your discussion on building your own sensors
> in AeroElectric Connection very informative, however,
> it raises a question: Can any CHT sensor be used with
> any CHT gauge as long as the temp ranges are the same
> for both devices?
>
> Theoretically possible but as a practical
> matter, maybe not. A thermocouple is a
> voltage versus temperature SOURCE. As long
> as the instrument reading the voltage draws
> ZERO current from the source, then that gage
> may be sued with any thermocouple of the
> right voltage/temperature curve. Most CHT
> couples are type K . . . but there ARE a few
> type J devices out there to.
>
> As a practical matter, you can parallel any
> number of electronic instrumentation systems
> onto a single thermocouple . . . electronic
> gages have a very high input impedance and do
> no 'pollute' the thermocouple's data.
>
> But ALL un-powered temperature displays
> place some demand on the thermocouple
> making it necessary to MATCH a gage with
> a thermocouple based on wire type (J,K,E,T)
> and resistance of the thermocouple lead-wire.
>
> I have installed a C90-12F on my Zenith CH750 project and want to hook
up at least one CHT sensor until I can confirm nominal temps within the
experimental cowl that is provided. And I don=92t want to spend
hundreds of bucks if not necessary.
>
> A local acft used parts shop has a couple of used CHT gauges available
at very reasonable prices but without sensors and wiring.
>
> Acft Spruce provides a sensor CP131 CHT Probe 18m, part number
10-01440. This sensor will fit under one of my selected cylinder spark
plugs.
>
> Would such a sensor work properly with a used CHT gauge? The used
gauge I have in mind reads to 600 F and has two leads which I assume
connect to the appropriate two leads from the sensor.
>
> The Aircraft Spruce catalog speaks to the use of type E
> thermocouple wire on their spark plug gasket offering.
> Here are excerpts from the data tables on the three popular
> thermocouple types.
>
>
> Type E
>
>
>
> Tyoe J
>
>
>
> Type K
>
>
>
> As you can see, type E has a lot more output
> that J and K. The tough nut is that any gage
> used with this particular produce must be
> MATCHED to the wire.
>
> The answer to your question is bounded by two
> points: (1) match gage to type of thermocouple
> wire and (2) finding an 18mm spark-plug gasket
> fitted wire appropriate to the gage.
>
>
>
> Bob . . .
>
Message 3
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| Subject: | Re: CHT challenge . . . |
Thanks, Bob,
Your discussion cleared up my concern - very helpful.
Bill
On Oct 31, 2016, at 9:42, Robert L. Nuckolls, III
<nuckolls.bob@aeroelectric.com> wrote:
> At 01:45 AM 10/31/2016, you wrote:
> Hi Bob,
>
> I found your discussion on building your own sensors
> in AeroElectric Connection very informative, however,
> it raises a question: Can any CHT sensor be used with
> any CHT gauge as long as the temp ranges are the same
> for both devices?
>
> Theoretically possible but as a practical
> matter, maybe not. A thermocouple is a
> voltage versus temperature SOURCE. As long
> as the instrument reading the voltage draws
> ZERO current from the source, then that gage
> may be sued with any thermocouple of the
> right voltage/temperature curve. Most CHT
> couples are type K . . . but there ARE a few
> type J devices out there to.
>
> As a practical matter, you can parallel any
> number of electronic instrumentation systems
> onto a single thermocouple . . . electronic
> gages have a very high input impedance and do
> no 'pollute' the thermocouple's data.
>
> But ALL un-powered temperature displays
> place some demand on the thermocouple
> making it necessary to MATCH a gage with
> a thermocouple based on wire type (J,K,E,T)
> and resistance of the thermocouple lead-wire.
>
> I have installed a C90-12F on my Zenith CH750 project and want to hook
up at least one CHT sensor until I can confirm nominal temps within the
experimental cowl that is provided. And I don=92t want to spend
hundreds of bucks if not necessary.
>
> A local acft used parts shop has a couple of used CHT gauges available
at very reasonable prices but without sensors and wiring.
>
> Acft Spruce provides a sensor CP131 CHT Probe 18m, part number
10-01440. This sensor will fit under one of my selected cylinder spark
plugs.
>
> Would such a sensor work properly with a used CHT gauge? The used
gauge I have in mind reads to 600 F and has two leads which I assume
connect to the appropriate two leads from the sensor.
>
> The Aircraft Spruce catalog speaks to the use of type E
> thermocouple wire on their spark plug gasket offering.
> Here are excerpts from the data tables on the three popular
> thermocouple types.
>
>
> Type E
>
>
>
> Tyoe J
>
>
>
> Type K
>
>
>
> As you can see, type E has a lot more output
> that J and K. The tough nut is that any gage
> used with this particular produce must be
> MATCHED to the wire.
>
> The answer to your question is bounded by two
> points: (1) match gage to type of thermocouple
> wire and (2) finding an 18mm spark-plug gasket
> fitted wire appropriate to the gage.
>
>
>
> Bob . . .
>
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