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GSBN: Digest for 5/7/02



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-> RE: GSBN:Compact/Inexpensive Temperature & Relative Humidity Sensor
     by jfstraube@...


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Date: 7 May 2002 21:12:30 -0500
From: jfstraube@...
Subject: RE: GSBN:Compact/Inexpensive Temperature & Relative Humidity Sensor

THe IRC is merely reporting on RH/T sensors we have built here at UW since
1994 or 1995.  I have used about 200 of these in the last 2 years alone.
Instead of the RTD, we using a Fenwall or YSI precision themistor, which
costs less than $10 to make a small $50 accurate RH/T sensor.  They require
a precise 5V power supply (e.g. you must know the voltage within 0.1 V
accuracy) for at least 5 minutes before you read them, a good mulitmeter to
read the results, and then a simple calculaitons.  We do this all with a
$2-5000 data logging system. To build them requires a bit of finesse and
experience with electronics.

Dr John Straube
165 Albert St., Waterloo, ON, Canada
phone 519 741 7920
fax 519 888 6197
jfstraube@...
www.buildingsolutions.ca

Anyone interested in details can email me directly and I will send you the
data sheet in pdf and a photo and installation guide.
We have recently installed 70 of these in a large SB building and have just
started monitoring.  Results may be availbale in 6 months.

Cheers


- -----Original Message-----
From: GSBN [mailto:GSBN@...]On Behalf Of Rob Tom
Sent: Friday, May 03, 2002 12:38 PM
To: gsbn@...
Subject: GSBN:Compact/Inexpensive Temperature & Relative Humidity Sensor


This item might be of interest to the gizmologists/FungalFans amongst us.

>From a cursory glance, it looks like a simple, reliable, inexpensive design
which will allow one to acquire accurate, simultaneous temperature &
relative humidity readings from a herd of locations (ie @ the inside &
outside skins of a SB wall and any number of points in between), something
that heretofore had required our friends in the SB community [ie Shawna
Henderson (aka the SeaBale Hag-with-the-amazing-spore-sniffing-snout), Habib
Gonzalez (mad bush pilot/ringleader of the Merry Mud Men) , (the
sartorially-resplendent) Rob Jolly]  a whole lot of futzing around in order
to accomplish in their moisture-monitoring/data-gathering adventures back in
the Olde Days of the previous millennium.

The individual, multi-function sensors appear to be no bigger than the tip
of a pen and it appears that a hundred or more of them can be controlled by
a ~$30 integrated circuit which then takes all the info and sends it to
one's computer so that it can do the book-keeping. It may even make peanut
butter and banana sandwiches too for all I know ?

And I'll bet that a hard-core gizmologist like the Derelict-in-the-Rough
could find a way to cannibalise the platinum sensor parts from any one of
the old 486's that he's using for doorstops. Me ? I have trouble just
reading a thermometer.


- ---------- Forwarded Message ----------

New Publications
Institute for Research in Construction
National Research Council Canada
[snip]

Maref, W.; Tardiff, Y.; Booth, D.G. Assembly and Calibration of a Compact
Temperature and Relative Humidity Sensor, Internal Report, Institute for
Research in Construction, National Research Council Canada, 849,  pp.
50,2002 (IR-849)
http://www.nrc.ca/irc/fulltext/ir849/

[snip]



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