RE: Re: DIY Heating Interface - Review

["Neil Ball" <neilball@xxxxxxxxxxxxxxx>]

Hi Frank

=20

You just need to make sure that the sensor is not affected by the material
it is mounted to =96 it needs to respond to air temperature, not the
furnit=
ure
or wall =96 so it needs to be isolated from its mounting to avoid thermal
conduction.=20

=20

Regarding the thimbles, we buy them in with the sensor ready mounted from
Sontay =96 see www.sontay.com <http://www.sontay.com/>  & click
on the
catalogue. The thimble sensors are at page 60. The thermistor bead sits in
near the top of the thimble behind the slots, so gets very good airflow. A
plastic tube is used as a conduit within the housing to ensure that the
thermistor cannot touch the housing. The rear is sealed with silicon to
avoid draughts entering from the wall cavity. The metal sensors are
machine=
d
from solid material while the plastic sensors are injection moulded. They
may be able to supply the basic housings as samples (not necessarily FOC)
i=
f
you want a few for testing with the Dallas sensors. The sensors will also
push fit into 20mm conduit tube if you use a few wraps of tape around the
threads =96 makes for a very neat installation without the need for a
drill=
ed
blank plate and back box.

=20

_____=20=20

From: ukha_d@xxxxxxx [mailto:ukha_d@xxxxxxx] On Behalf Of
Frank Mc Alinden
Sent: 15 August 2005 09:51
To: ukha_d@xxxxxxx
Subject: Re: [ukha_d] Re: DIY Heating Interface - Review

=20

Hi Neil
Thanks for the info , very interesting.....
I was going to embed some dallas temp sensors into furniture if i can
get=20
something like Steves button holders.....Should the dallas sensor be=20
immersed in some heat sink compound to help heat transfer ?? os is this
not=
=20
necessary... any suggestiond for a thimble type device to hold a dallas=20
sensor ???

Thanks again
Frank

----- Original Message -----=20
From: "Neil Ball" <neilball@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Monday, August 15, 2005 6:37 PM
Subject: RE: [ukha_d] Re: DIY Heating Interface - Review


Regarding the room temp sensor mounting, it might be worth bearing in mind
that the sensor element needs to be insulated from the metal housing to
avoid direct conduction from the housing/wall. It's also a good idea to
hav=
e
the sensor element sitting off the wall surface so it gets good airflow
across it - you can get a boundary effect at the wall surface that reduces
the accuracy of the reading otherwise. Finally make sure the cable entry to
the back of the sensor is sealed - the wall cavities in dry lined external
walls can be incredibly draughty places which can sometimes cause problems.
Having said that it's all relative, and in any case should be more
responsive than a bi-metallic thermostat.



In some tests with a button type sensor similar to that Steve describes
& a
thimble type sensor with the sensor element around 20mm from the wall, the
thimble gave a faster response and closer temperature reading to the
reference sensor. The differences were in tenths of a degree so not too
muc=
h
of a problem, and in the end it was the mechanical protection of the
thimbl=
e
housing that was a major factor in deciding to use them in preference to
th=
e
button sensor.



_____

From: ukha_d@xxxxxxx [mailto:ukha_d@xxxxxxx] On Behalf Of
steve_stealth2004
Sent: 13 August 2005 10:14
To: ukha_d@xxxxxxx
Subject: [ukha_d] Re: DIY Heating Interface - Review



--- In ukha_d@xxxxxxx, "Frank Mc Alinden" <frankmc@i...>
wrote:
> Hi Steve
>             Pic looks good are they both bullet shells ??

One of them is made from a brass clothing button cap with the shaft
of a Bic biro pen.  The other is encapsulated in an empty bullet
shell casing.

The button cap version was intended to be mounted flush in a interior
wall with just the brass button cap showing. (Approx size:- length =3D
25mm, black shaft =3D 6mm and button head is =3D 12mm x 1mm)    of course
it doesn't need to be brass you could choose one to suit your
d=E9cor..

The bullet shell is intended to be used outdoors and can be
submerged.  (Approx size:- length =3D 25mm, diameter is 10mm)

> where would you source empty bullet shells i wonder ??

I got mine from a gun shop,  the guy gave me a bag full,   must be
around 50-100 for =A34.  If you need some Frank,  I'll send you
some,
just let me know how many you may need.

Steve










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