Re: Outside/Inside Temperature Sensor location

[Ben McCormack <yahoogroup@xxxxxxxxxxxxxxxxxxx>]

I have been thinking about this.

You are saying the delta remains the same through the temp range for
different temperatures.

What about purchasing 1 certified/calibrated temp sensor and then
setting the offset for all your other sensors from this?

Ben

On 3 Feb 2009, at  09:03, Nigel Giddings wrote:

> Neil,
>
> I have a number of 1-Wire temp sensors around my house used to measure
> room temperatures for control of the heating.
>
> I have the sensors on the ground floor and 1st floor located in the
> light switches, with sensors in the basement (2.8M high ceilings)
> 400mm
> from the ceiling, hanging from tray work...
>
> I also have a couple located in the Loft. They are both located next
> to
> each other on a breadboard yet they show different temperatures. As
> you
> say they work +-0.5 degrees. What I have found is they track each
> other
> with the delta remaining the same.
>
> I use Homeseer/Temp05 to collect the data with the mcsTemperature
> plugin. I have also started to use the Ultra1wire plugin with my
> recently purchased HA7NET 1wire hub which I would highly recommend. I
> could if I wanted add a fixed offset in the mcsTemperature plugin so
> the
> two devices read exactly the same but would it be the right
> temperature?
>
> I find the sensors very good for control of the UFH but as mentioned
> different heating systems may react differently.
>
> I have uploaded an image to the files area of UKHA_D in the file
> Corbenic which shows the two loft sensors measuring temperatures in
> the
> last 72 hours.
>
> HTH
>
> Nigel
>
>
>
> -----Original Message-----
> From: ukha_d@xxxxxxx [mailto:ukha_d@xxxxxxx] On Behalf
> Of Neil Wrightson
> Sent: 30 January 2009 20:09
> To: ukha_d@xxxxxxx
> Subject: [ukha_d] Outside/Inside Temperature Sensor location
>
> Hi,
>
> I'm looking at putting some 1wire/ibutton temperature sensors in and
> I'm
> wondering where is the best location for the sensors.
>
> Outside
>
> Just mounting on the side of the house or garage wall would not do due
> to
> the possible heating or cooling effect of the brickwork.
>
> Even putting it a short distance i.e.300mm of the brick work. It would
> still
> be affected by radiated heat.
>
> Putting it in the middle of the yard where there is no shade sounds ok
> but
> then how? Sky hook? And it also would then be affected by the direct
> radiated heat from the sun, making it feel hotter than it actually is.
>
> Inside
>
> Same problem with inside, picking up the ambient room temperature
> without
> being affected by the internal wall temperatures, sometimes the actual
> walls
> can be substantially cooler/hotter than the air temp. Also what
> height,
> again there can be quite a few degree's C difference between the
> temperature
> 300mm of the floor to 300mm of the ceiling.
>
> Where is the ambient temperature?
>
> Regards,
>
> Neil Wrightson.
>
> <http://geo.yahoo.com/serv?s=97359714/grpId=1109639/grpspId=1705041992/m
> sgId
> <http://geo.yahoo.com/serv?s=97359714/grpId=1109639/grpspId=1705041992/m
> sgId>
> =155223/stime=1233342910/nc1=4025373/nc2=5349274/nc3=5170420>
>
>
> [Non-text portions of this message have been removed]
>
>
>
> [Non-text portions of this message have been removed]
>
>
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