RE: Sensor locations ...

["Neil Ball" <neilball@xxxxxxxxxxxxxxx>]

Regarding temperature, the best measurement would be as close to where
you
are in the room or failing that then a good rule of thumb is to wall mount
at your normal light switch height, at this height you do not have to worry
about what kind of heating is used. If you have underfloor heating then you
need to make sure you do not use the ceiling or high mounting as the air
does not rise or circulate as it would with radiators as there are no high
temperature surfaces to drive the convection currents.  Discrete sensors
are
fine providing the sensor housing allows good airflow over the thermistor
or
other measuring element, and make sure they are sealed at the back to avoid
cool air from the wall cavity passing into the sensor. Obviously you need
to
avoid direct sunlight, heat from equipment in the room and avoid dead air -
don't place furniture or furnishings over the sensor. In many cases the
sensor location is a compromise of one kind or another so don't be too hung
up on the absolute value you control to, use whatever feels comfortable to
you.



Neil B.





_____

From: ukha_d@xxxxxxx [mailto:ukha_d@xxxxxxx] On Behalf Of
Chris Hunter
Sent: 25 August 2007 19:04
To: ukha_d@xxxxxxx
Subject: [ukha_d] Sensor locations ...



for good & effective HA, 'seems we'll be needing lots of sensors ...
PIR, temp', humidity, CCTV, etc, and plenty of them ... but where to
mount them ... wall, ceiling ... perhaps even in light-fittings, and
on the sides of cupboards ... but, 'wondered if anyone had found any
one better than any other ... or, better-still, if anyone had worked-
out any good guidelines, or things to avoid ... and how to keep SWMBO
on-side - aesthetics being the issue - ceiling-mounting would be
good, but 'not sure SWMBO would be keen !

Chris





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