[chbot] Suitable Epoxy

[Mark Beckett]

Folks
I went through a similar exercise when dealing with the temperature 
detection on a vehicle for controlling electric fans.


1.     You can get High temperature RTV that goes to 260 deg C
2.     If you're dealing with pressure then sealing is an issue.
3.     I prefer the already encased DS18x20 range of one Wire devices, 
which can be run over a long distance (don't use parasitic power, run 
three wires)
4.     The spa pool controllers I repaired used a stainless sleeve, with 
the TMP35?  device inside the sleeve, and a blob of heatsink transfer 
compound.
            They had no pressure and used a compression gland to seal it.

In the end I used a simple Automotive resitive sender available locally 
and priced about $17.
It screwed into a standard fitting, and therefore sealed against leak 
and pressure.
I mapped the ADC reading against the temperature.

If you want more details let me know.


Mark



Jasper Mackenzie wrote:
> Mark,
> ... Did you notice anything about the water level?
>  Baths are full of Eureka
> Winston,
>  Have you used J B Weld submerged in hot water?
>
> Good points all.
>
> Thanks.
>
> Jasper
>
> On 20 October 2014 13:18, Mark Atherton <markaren1 at xtra.co.nz 
> <mailto:markaren1 at xtra.co.nz>> wrote:
>
>     Just been thinking about this in the bath...
>
>     you may need to watch out for differential expansion issues with a
>     hard adhesive
>
>     basically if the substrate, IC, and adhesive expand at different
>     rates with temperature, the adhesive might damage one of the other
>     two.
>
>     you may be able to offset this issue by curing the adhesive at
>     60c, so only 40c to room temp and 40c to 100c
>
>     -mark
>
>
>
>     At 12:34 p.m. 20/10/2014, you wrote:
>
>         Jaycar have J B Weld - Heat resistance: 260 degrees Celsius,
>         Contents: 25ml : $17.00
>         http://tinyurl.com/ljgljpy
>
>         At 12:04 p.m. 20/10/2014, you wrote:
>
>             I'd suggest Shoe goo. it will be superior to araldite for
>             this application in many ways. Available from sports stores.
>
>             On Mon, Oct 20, 2014 at 12:00 PM, Jasper Mackenzie
>             <<mailto:jasper.mackenzie at gmail.com
>             <mailto:jasper.mackenzie at gmail.com>>jasper.mackenzie at gmail.com
>             <mailto:jasper.mackenzie at gmail.com>> wrote:
>             I have a few temperature sensors (SOIC8) to keep submerged
>             in water up to boiling temperature.
>             Â So far I have had a whole load of failures keeping them
>             healthy and dry.
>
>             My next plan is to solder wires to them then encase them
>             in Araldite.
>             Is there anything wrong with this? Will I discover that
>             Araldite is not rated to 100deg.
>             Â If not, suggestions please.
>
>             All this in my bid to prove Mark wrong regarding how far
>             IIC can go reliably (so far he has been right... still
>             suprised 8)
>
>             Jasper
>
>
>
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