RE: Re: DIY Heating Interface - Review

["Neil Ball" <neilball@xxxxxxxxxxxxxxx>]

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=92s also a good idea to
h=
ave
the sensor element sitting off the wall surface so it gets good airflow
across it =96 you can get a boundary effect at the wall surface that
reduce=
s
the accuracy of the reading otherwise. Finally make sure the cable entry to
the back of the sensor is sealed =96 the wall cavities in dry lined
externa=
l
walls can be incredibly draughty places which can sometimes cause problems.
Having said that it=92s all relative, and in any case should be more
responsive than a bi-metallic thermostat.

=20

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.

=20

_____=20=20

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

=20

--- In ukha_d@xxxxxxx, "Frank Mc Alinden" <frankmc@i...>=20
wrote:
> Hi Steve
>             Pic looks good are they both bullet shells ??=20=20

One of them is made from a brass clothing button cap with the shaft=20
of a Bic biro pen.  The other is encapsulated in an empty bullet=20
shell casing.

The button cap version was intended to be mounted flush in a interior=20
wall with just the brass button cap showing. (Approx size:- length =3D=20
25mm, black shaft =3D 6mm and button head is =3D 12mm x 1mm)    of
course=20
it doesn't need to be brass you could choose one to suit your
d=E9cor=85.

The bullet shell is intended to be used outdoors and can be=20
submerged.  (Approx size:- length =3D 25mm, diameter is 10mm)=20

> 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=20
around 50-100 for =A34=85  If you need some Frank,  I'll send you
some,=20
just let me know how many you may need=85

Steve










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