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OAT Probes for Garmin Transponder

 
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email(at)jaredyates.com
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PostPosted: Sat Jul 09, 2022 6:07 pm    Post subject: OAT Probes for Garmin Transponder Reply with 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.


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Ceengland



Joined: 11 Oct 2020
Posts: 378
Location: MS

PostPosted: Sat Jul 09, 2022 6:55 pm    Post subject: OAT Probes for Garmin Transponder Reply with quote

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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PostPosted: Sun Jul 10, 2022 9:37 am    Post subject: OAT Probes for Garmin Transponder Reply with quote

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

PostPosted: Sun Jul 10, 2022 12:02 pm    Post subject: Re: OAT Probes for Garmin Transponder Reply with quote

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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PostPosted: Sun Jul 10, 2022 4:52 pm    Post subject: OAT Probes for Garmin Transponder Reply with quote

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








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