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RE: GSBN:Compact/Inexpensive Temperature & Relative Humidity Sensor

<x-charset iso-8859-1>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

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.


-----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

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)


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