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bluetooth in-situ meat thermometer, has +275 degree C range!

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Winfield Hill
Guest

Fri Dec 28, 2018 1:45 pm   



https://www.indiegogo.com/products/meater-wireless-smart-meat-thermometer

RF telemetry to a wood storage/charging block, bluetooth from there to an app on
your phone. But wait, electronics running at 275 deg C !?? OK, there's a
secret. A great product idea, excellent implementation, I just ordered one for
$99.


--
Thanks,
- Win

Bob Engelhardt
Guest

Fri Dec 28, 2018 2:45 pm   



Anyone who wants to cook meat to 275C (527F) should re-think their
recipe. <G>


Guest

Fri Dec 28, 2018 2:45 pm   



On Friday, December 28, 2018 at 11:02:07 PM UTC+11, Winfield Hill wrote:
Quote:
https://www.indiegogo.com/products/meater-wireless-smart-meat-thermometer

RF telemetry to a wood storage/charging block, bluetooth from there to an app on
your phone. But wait, electronics running at 275 deg C !?? OK, there's a
secret. A great product idea, excellent implementation, I just ordered one for $99.


As secrets go, the idea that the active electronics will be embedded in the meat, and thus not get hotter than 100 degrees Celcius isn't all that well-concealed.

The downside is that if you get careless or absent minded and over-cook the meat until it has dried out, you've also over-cooked the thermometer.

My oven thermometer has thin leads that survive having the cooker door closed on them, and was a whole lot cheaper. And I haven't over-cooked it yet.

--
Bill Sloman, Sydney

amdx
Guest

Fri Dec 28, 2018 3:45 pm   



On 12/28/2018 7:23 AM, Bob Engelhardt wrote:
Quote:
Anyone who wants to cook meat to 275C (527F) should re-think their
recipe. <G


I had a boneless prime rib cooked sous vide at 133*F just before
Christmas. A quick broil at high temp to sear the outside, and it was
very good. 5 of us ate 4 lb with no leftovers!

Mikek

Chris
Guest

Fri Dec 28, 2018 7:45 pm   



On 12/28/18 14:07, amdx wrote:
Quote:
On 12/28/2018 7:23 AM, Bob Engelhardt wrote:
Anyone who wants to cook meat to 275C (527F) should re-think their
recipe. <G

I had a boneless prime rib cooked sous vide at 133*F just before
Christmas. A quick broil at high temp to sear the outside, and it was
very good. 5 of us ate 4 lb with no leftovers!

Mikek


Even a cheap tough joint of beef will slow cook fine to fall off
the bone using the low hundreds C for a few hours...

Winfield Hill
Guest

Fri Dec 28, 2018 7:45 pm   



bill.sloman_at_ieee.org wrote...
Quote:

The downside is that if you get careless or absent minded
and over-cook the meat until it has dried out, you've also
over-cooked the thermometer.


There is a bit of safety margin. In addition to the lag near
100 C, as moisture evaporates, the electronics can certainly
handle much higher temperatures. If they're smart, they'll
turn the thing off. It should be able to survive 175 to 200C.


--
Thanks,
- Win


Guest

Fri Dec 28, 2018 9:45 pm   



On Friday, 28 December 2018 18:06:29 UTC, Winfield Hill wrote:

Quote:
There is a bit of safety margin. In addition to the lag near
100 C, as moisture evaporates, the electronics can certainly
handle much higher temperatures. If they're smart, they'll
turn the thing off. It should be able to survive 175 to 200C.


But what sort of battery will survive such temperatures?

John

olaf
Guest

Fri Dec 28, 2018 10:45 pm   



jrwalliker_at_gmail.com wrote:


>But what sort of battery will survive such temperatures?

My guess: There is no battery. They use a capacitor and charge it inside
the woodblock.


Olaf


Guest

Fri Dec 28, 2018 11:45 pm   



On Friday, 28 December 2018 21:00:06 UTC, olaf wrote:
Quote:
jrwalliker_at_gmail.com wrote:


But what sort of battery will survive such temperatures?

My guess: There is no battery. They use a capacitor and charge it inside
the woodblock.


Olaf


They could also use a thermopile, though it won't.


NT

Jeff Liebermann
Guest

Sat Dec 29, 2018 12:45 am   



On Fri, 28 Dec 2018 15:21:40 -0800, Jeff Liebermann <jeffl_at_cruzio.com>
wrote:

Quote:
If you run the Meater instructional video, the inventor emphasizes the
"ambient temperature" end of the probe, as marked by an indentation
around the probe.
https://youtu.be/wlhfY8OriwU
https://www.youtube.com/c/meater
The video at 2:46 shows temperatures of:
internal 114c
target 135C
ambient 211C


Oops. The video and non-existent spec sheet does not show the units
of measure. Apparently, the video is in Farenheit, not Celcius.
<https://www.foodnetwork.com/recipes/bobby-flay/perfectly-grilled-steak-recipe-1973350>
The above should be:
<https://youtu.be/wlhfY8OriwU>
<https://www.youtube.com/c/meater>
The video at 2:46 shows temperatures of:
internal 114F (45.5C)
target 135F (57.2C)
ambient 211F (99.4C)

The rest of my speculation is just plain wrong and should be (mostly)
ignored.

--
Jeff Liebermann jeffl_at_cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

Jeff Liebermann
Guest

Sat Dec 29, 2018 12:45 am   



On Fri, 28 Dec 2018 12:17:44 -0800 (PST), jrwalliker_at_gmail.com wrote:

Quote:
On Friday, 28 December 2018 18:06:29 UTC, Winfield Hill wrote:

There is a bit of safety margin. In addition to the lag near
100 C, as moisture evaporates, the electronics can certainly
handle much higher temperatures. If they're smart, they'll
turn the thing off. It should be able to survive 175 to 200C.

But what sort of battery will survive such temperatures?
John


Borehole (oil well drilling) batteries:
<https://www.sciencedirect.com/science/article/abs/pii/S0378775304002915>
<https://www.sciencedirect.com/science/article/abs/pii/S0378775313011476>
However, these only go to 200C, which is probably acceptable since
they don't need to work higher than the internal temperature of the
steak.

If you run the Meater instructional video, the inventor emphasizes the
"ambient temperature" end of the probe, as marked by an indentation
around the probe.
<https://youtu.be/wlhfY8OriwU>
<https://www.youtube.com/c/meater>
The video at 2:46 shows temperatures of:
internal 114c
target 135C
ambient 211C
I would guess(tm) that the BT radio is in the internal region and that
something inside the device requires a temperature differential in
order to function.

A Peltier (Seebeck) effect thermopile could produce the necessary
power using the available 80C differential temperature, but I couldn't
think of a way to fit one into the probe or keep the cost within
reason.

It's probably not a supercap, which typically works to 70C with a few
types claiming 85C.
<http://www.kemet.com/Lists/FileStore/PartnerHub%20PTM%20Supercapacitors%20Rev%201%206.18.14.pdf>


--
Jeff Liebermann jeffl_at_cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

amdx
Guest

Sat Dec 29, 2018 12:45 am   



On 12/28/2018 12:14 PM, Chris wrote:
Quote:
On 12/28/18 14:07, amdx wrote:
On 12/28/2018 7:23 AM, Bob Engelhardt wrote:
Anyone who wants to cook meat to 275C (527F) should re-think their
recipe. <G

I had a boneless prime rib cooked sous vide at 133*F just before
Christmas. A quick broil at high temp to sear the outside, and it was
very good. 5 of us ate 4 lb with no leftovers!

Mikek

Even a cheap tough joint of beef will slow cook fine to fall off
the bone using the low hundreds C for a few hours...



133* F is 56* C not near low hundreds.

Mike Coon
Guest

Sat Dec 29, 2018 10:45 am   



In article <cf634831-a627-4a55-8daf-7649b6fc655e_at_googlegroups.com>,
tabbypurr_at_gmail.com says...
Quote:

On Friday, 28 December 2018 21:00:06 UTC, olaf wrote:
jrwalliker_at_gmail.com wrote:


But what sort of battery will survive such temperatures?

My guess: There is no battery. They use a capacitor and charge it inside
the woodblock.


Olaf

They could also use a thermopile, though it won't.


NT


But that would require a temperature difference for hot and cold
junctions...

Mike.


Guest

Sat Dec 29, 2018 1:45 pm   



On Saturday, 29 December 2018 08:54:51 UTC, Mike Coon wrote:
Quote:
In article <cf634831-a627-4a55-8daf-7649b6fc655e_at_googlegroups.com>,
tabbypurr says...
On Friday, 28 December 2018 21:00:06 UTC, olaf wrote:
jrwalliker_at_gmail.com wrote:


But what sort of battery will survive such temperatures?

My guess: There is no battery. They use a capacitor and charge it inside
the woodblock.


Olaf

They could also use a thermopile, though it won't.


NT

But that would require a temperature difference for hot and cold
junctions...

Mike.


which obviously it has. Did you think the inside of your roast joint gets to over 200C? It would be dry & burnt if it did.


NT

Tim Watts
Guest

Sat Dec 29, 2018 5:45 pm   



On 28/12/2018 13:23, Bob Engelhardt wrote:
Quote:
Anyone who wants to cook meat to 275C (527F) should re-think their
recipe. <G


That's the outside end (ambient) so I guess it is just possible to get
near that with a decent oven. Still quite impressive that they protected
the electronics from that high a temperature at one end, especially the
energy source (battery?)

I tend to roast at 180C - would be interested in looking at one for real...

--
Email does not work

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