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

[Rager, Brent A]

Brett,

The temperature sensor in the house was mounted to a wall adjacent to
the attice 12 feet up short of the ceiling by 8 foot and I was careful
to orient the sensor up.  I expect the placement would result in a 2-5
degrees warmer than the 6 foot level what I found was a temp readin of
119F vs 77F on my Fluke temp sensor.  The attic was reading 126F vs 84F
on the Fluke, placement in the attice was 36inch from the floor in the
center of the attic and more than 20ft from any vent, again I was
watching the placement error carefully.

I'll call my customer (cousin) to check the readings again in a day or
two.  The sensors are from HAI.

Thanks for the tips, I'll see about moving the sensors to see if it
makes and significant difference.

Brent 

-----Original Message-----
From: Brett Griffin [mailto:brett.griffin at comcast.net] 
Sent: Monday, April 04, 2005 12:01 PM
To: Rager, Brent A; hai-users at tssi.com
Subject: RE: [Hai-users] Any Resolution to HAI Temp Sensors?

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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