[Hai-users] Any Resolution to HAI Temp Sensors?

[Brett Griffin]

Brent,

You have to be very diligent about placement of the sensor.  I have placed a
temp/humidity sensor in my basement, and on the second floor of the home I
live in, and the most part it worked ok.  

One trip away from home, I signed into weblink, to learn the temp in the
basement was 95 degrees. I thought there might be a fire in the basement.
Waiting 15 minutes it dropped back down to 68 degrees.   It typically stays
around 65 degrees as it is not a heated space. The problem was I mounted it
about 18" from a heating duct.

The other sensor is typically off by a couple degrees.  The problem was it
was mounted 9" directly above a electrical outlet.  Which was not the
problem.  The problem was I plug in a wall wart.  A wall wart transforms AC
to Dc for some device.  That conversion produces a small amount of heat.

So with these examples, and many other I heard when at HAI, most of the
issues were dealing with improper placement.  There was a long discussion
about a year ago on this board about this.  HAI determined two issues, one
there was a problem in a small batch of these sensors, and they fixed them.
The other thing was improper placement.  

For proper placement, you need to mount these out of direct sunlight
sheltered from rain.  On the board there is an arrow printed on the circuit
board and this needs to be point up, as the accuracy depends on circulation
of air based on convection.  (Chips at the top of the board produce some
heat and as the heat rises, outside air is pulled in from the bottom.) The
cover has vents these must be situated at the top and bottom, for the
convection process.

Lastly ensure there is no heat producing elements near by, especially
directly below the sensor. I.e. pavement, any dark material, mounted on the
inside of the roof, near a in-ceiling can light, dryer vent, etc.  there are
a thousand bad places in the home to mount a sensor.  

If after you have verified all of these items, it could be you bought a bad
sensor, and should call HAI, OnQ, or Aegis tech support for a bad-out-of-box
or in-warranty RMA for a replacement.

Brett Griffin, Technology Consultant

Archi . tech . tronics, Inc. 
high performance technology planningT
p. (610) 825.7018 f (215) 827.5484

**top 10 reasons to use Architechtronics, Inc. for your next project:
http://www.architechtronics.com/top10.html


-----Original Message-----
From: hai-users-bounces at tssi.com [mailto:hai-users-bounces at tssi.com] On
Behalf Of Rager, Brent A
Sent: Monday, April 04, 2005 9:03 AM
To: hai-users at tssi.com
Subject: [Hai-users] Any Resolution to HAI Temp Sensors?

Installed a Temp sensor in the attic and a Temp Humidity on a project
this weekend and both were 42F + over ambient temperature.  Was there
any fix for this?  The house is only about 90% done with no phone
service so I can't call in and see if whether the performance improves
over time.  

Brent Rager 

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