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email(at)jaredyates.com
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 Posted: Sat Jul 09, 2022 6:07 pm Post subject: OAT Probes for Garmin Transponder |
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I've been working with a Garmin GTX 335 transponder installation. There is an optional outside air temp probe that enables a handy density altitude feature.
I found one reference that says the transponder is looking for this:
OUTSIDE AIR TEMPERATURE PROBE STANDARD 2-WIRE THERMOCOUPLE WITH 1 MICRO-AMP PER 1 DEGREE KELVIN RESPONSE. SUITABLE MODELS ARE: EDMO 655 AND DAVTRON C307PS.
I tried an extra Dynon OAT probe that I had sitting around, and it indicated 175 degrees F. So I can rule out that one.
The extra transponder feature is cool but not really cool enough to spend $150 on one of the above probes. Does anyone know what kind of thermocouple will produce 1 microamp per degree kelvin? Seems like making something up might be a fun experiment.
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Ceengland
Joined: 11 Oct 2020
Posts: 391
Location: MS
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| Posted: Sat Jul 09, 2022 6:55 pm Post subject: OAT Probes for Garmin Transponder |
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On 7/9/2022 9:52 PM, Charlie England wrote:
| Quote: | On 7/9/2022 9:06 PM, Jared Yates wrote:
> I've been working with a Garmin GTX 335 transponder installation.
> There is an optional outside air temp probe that enables a handy
> density altitude feature.
>
> I found one reference that says the transponder is looking for this:
> OUTSIDE AIR TEMPERATURE PROBE STANDARD 2-WIRE THERMOCOUPLE WITH 1
> MICRO-AMP PER 1 DEGREE KELVIN RESPONSE. SUITABLE MODELS ARE: EDMO 655
> AND DAVTRON C307PS.
>
> I tried an extra Dynon OAT probe that I had sitting around, and it
> indicated 175 degrees F. So I can rule out that one.
>
> The extra transponder feature is cool but not really cool enough to
> spend $150 on one of the above probes. Does anyone know what kind of
> thermocouple will produce 1 microamp per degree kelvin? Seems like
> making something up might be a fun experiment.
According to this link:
https://www.davtron.com/product-detail.php?PROBE-12FT-WHT-C307PS-26
The actual device is an AD590.
<Attached is the datasheet for the device.> Scratch that; the server
won't accept a pdf file. If you want it, email me directly & I'll send
you a copy.
Here's a link to an ebay listing:
https://www.ebay.com/itm/122222526186
I bought a couple from that vendor, and used one with an AFS4500; it
works fine. I don't know whether the Dynon probe is the same as the
one AFS used with their older EFISs.
Hope the above info helps,
Charlie
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nuckolls.bob(at)aeroelect
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| Posted: Sun Jul 10, 2022 9:37 am Post subject: OAT Probes for Garmin Transponder |
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At 09:06 PM 7/9/2022, you wrote:
| Quote: | I've been working with a Garmin GTX 335 transponder installation. There is an optional outside air temp probe that enables a handy density altitude feature.
I found one reference that says the transponder is looking for this:
OUTSIDE AIR TEMPERATURE PROBE STANDARD 2-WIRE THERMOCOUPLE WITH 1 MICRO-AMP PER 1 DEGREE KELVIN RESPONSE. SUITABLE MODELS ARE: EDMO 655 AND DAVTRON C307PS.
I tried an extra Dynon OAT probe that I had sitting around, and it indicated 175 degrees F. So I can rule out that one.
The extra transponder feature is cool but not really cool enough to spend $150 on one of the above probes. Does anyone know what kind of thermocouple will produce 1 microamp per degree kelvin? Seems like making something up might be a fun experiment. |
I believe those probes are based on the Analog
Devices AD590 temperature to current sensor chip.
https://tinyurl.com/2mqyzbtj
You can probably craft a substitute probe from one
of these available from Digikey and elsewhere
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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andymeyer
Joined: 31 Mar 2015
Posts: 54
Location: SW MI
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| Posted: Sun Jul 10, 2022 12:02 pm Post subject: Re: OAT Probes for Garmin Transponder |
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Use this: AD592 from Mouser
https://www.mouser.com/ProductDetail/584-AD592CNZ or
https://www.mouser.com/ProductDetail/584-AD592ANZ
Much less expensive and higher accuracy component - newer version of the AD590. It has three terminals, but only two are used. I've used these with my GTX330ES and my uAvionix AV30E with excellent effect - both accuracy and weight of my wallet!
On my LongEZ, The probe is wrapped in 2 layers of heat shrink and RTV'd in the gear well with about 3/4" protrusion.
ANZ is +/- 2.5C, BNZ is +/- 1.0C and the CNZ is +/- .5C.
The Davtron probe is +/- 2.5C (AD590KH)
Andy
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email(at)jaredyates.com
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| Posted: Sun Jul 10, 2022 4:52 pm Post subject: OAT Probes for Garmin Transponder |
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Thanks everybody, this is a big help! I read further and found that the Dynon probe is resistive, whereas these little ICs are a current source.
On July 10, 2022 16:07:12 "andymeyer" <meyerkc135(at)gmail.com> wrote:
| Quote: | --> AeroElectric-List message posted by: "andymeyer" <meyerkc135(at)gmail.com>
Use this: AD592 from Mouser
https://www.mouser.com/ProductDetail/584-AD592CNZ or
https://www.mouser.com/ProductDetail/584-AD592ANZ
Much less expensive and higher accuracy component - newer version of the AD590. It has three terminals, but only two are used. I've used these with my GTX330ES and my uAvionix AV30E with excellent effect - both accuracy and weight of my wallet!
On my LongEZ, The probe is wrapped in 2 layers of heat shrink and RTV'd in the gear well with about 3/4" protrusion.
ANZ is +/- 2.5C, BNZ is +/- 1.0C and the CNZ is +/- .5C.
The Davtron probe is +/- 2.5C (AD590KH)
Andy
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=507438#507438
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