Re: 1 Wire Mounting options

["John Andrews" <groups@xxxxxxxxxxxxxxxx>]

Nigel

Very interesting point about the mount point - I had not really thought
about temperature variations.
Most were going to be mounted at around 2 metres from the floor as I have
kit that requires 3 x cat5 points mounted on the wall.
Other rooms - where there is a convenient spare cat5 socket.

My sensors at the moment are all mounted on the ceiling, and these I use to
control the thermostat of the central heating - I will bear that in mind
when I change over.

This year is CAT5 year at home, nothing will have a discreet wire.

----- Original Message -----
From: "Nigel Giddings" <nigel@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Sunday, January 16, 2005 11:42 AM
Subject: RE: [ukha_d] 1 Wire Mounting options


>
> John,
>
> What height do you intend to mount these in your rooms ?
>
> I have run a long term comparison between a 1 wire temperature sensor
at
> about 1.5M and another directly above at about 2.4M. The room is not
> heated at the moment, it is a basement room which will eventually have
> UFH. Both probes read the same temperature with the door closed and no
> heat source, this is somewhere between 8 and 10 degrees C. However if
I
> vent my Node 0 into the room with air temperature between 20 and 25
> degrees C then the temperature of the probe at 1.5m is pretty stable
but
> the probe mounted higher is affected by the in rush of warmer air (at
that
> height?).
>
> This variation may be able to be compensated for in S/W although it is
not
> linear and does depend on air movement more than the absolute
temperature.
> The question really is which more closely reflects the feeling of
comfort
> perceived by a human...
>
> I had hoped to place the sensors high in the room but I am concerned
that
> this will not manage the temperature where we, as humans, want it
between
> 1 and 2 metres from the floor.
>
> Nigel