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From: Rich Webb on 11 Jun 2010 11:25
On Fri, 11 Jun 2010 10:56:13 -0400, Tony <tony.miklos(a)gmail.com> wrote:

>vjp2.at(a)at.BioStrategist.dot.dot.com wrote:
>> I've seen $250 humidity detecting fans (Broan?). I have a timer on my bath
>> fans, and motion detectors on my hallway lights (installed when my dad was
>> dying), so I can't believe they can't make a wall switch which detects
>> humidity. ANyone see one? Couldn't find one with google. Besides the
>> bathrooms, I'd wonder if I can't have one for the house when I'm away and
>> don't want to have the heat or cool on just to prevent mildew. I hadn't used
>> cooling in years and the upstairs duct perspired onto my ceiling.
>
>I bought 2 army surplus one years ago, high quality stuff! I used it to
>totally rebuild a donut proofing box because none of the original parts
>were available. (the donut proofing box circulates warm humid air
>around the raw donuts so they rise without drying out). A fan, a
>stainless steel container like in a salad bar with a generic water
>heating element installed in it, the humidistat, and a larger container
>of water to siphon water in the small "boiler". Sorry I can't recall
>where I bought them.

To *measure* humidity, the easiest I've found are the HIH-4000 series
from Honeywell. Vout is very nearly linear against percent relative
humidity (a second-order fit improves it a little at the cost of some
computations). Feed it 5 VDC, read with an ADC, simple.

For a setpoint, though, the GE HS12 or HS15 are cheaper. They must be
driven by AC (no DC bias allowed) and the impedance range is over 4
decades, so it is not just a simple ADC hookup. But just to get a trip
point reading would be fairly straightforward.

--
Rich Webb Norfolk, VA
From: GregS on 11 Jun 2010 16:01
In article <87f14aF1dpU1(a)mid.individual.net>, Tony <tony.miklos(a)gmail.com> wrote:
>vjp2.at(a)at.BioStrategist.dot.dot.com wrote:
>> I've seen $250 humidity detecting fans (Broan?). I have a timer on my bath
>> fans, and motion detectors on my hallway lights (installed when my dad was
>> dying), so I can't believe they can't make a wall switch which detects
>> humidity. ANyone see one? Couldn't find one with google. Besides the
>> bathrooms, I'd wonder if I can't have one for the house when I'm away and
>> don't want to have the heat or cool on just to prevent mildew. I hadn't used
>> cooling in years and the upstairs duct perspired onto my ceiling.
>
>I bought 2 army surplus one years ago, high quality stuff! I used it to
>totally rebuild a donut proofing box because none of the original parts
>were available. (the donut proofing box circulates warm humid air
>around the raw donuts so they rise without drying out). A fan, a
>stainless steel container like in a salad bar with a generic water
>heating element installed in it, the humidistat, and a larger container
>of water to siphon water in the small "boiler". Sorry I can't recall
>where I bought them.

Yes I probably bought the same ones years ago. Wrapped in sealed
bags. I just tried using one in my bathroom.
They are not reliable near the extremes. You cannot set it to 80 % hummidity.
The horse hair mechanism is too critical up there. I was able to set it
to about 60%, and one rainy day it just came on. i mounted it uo in the air
box which I had taken out the fan and used an in-line fan for noise control.Its
works OK with the Dew Stop condensation sensor,
but I really need more CFM.
Most mechanical sensors have the wrong connection for fan use.

greg
From: Grumpy on 11 Jun 2010 20:29
In my opinion you are all wet, at temperature you have outline Humidistat
would be useless unless you have Dehumidifier run at all times,
and at 57 Deg. F not likely that you will get below 50% rh
so all you doing is wasting your time but lots luck.

"Dave Plowman (News)" <dave(a)davenoise.co.uk> wrote in message
news:512533a0f9dave(a)davenoise.co.uk...
> In article <huql06$s0r$1(a)reader1.panix.com>,
> <vjp2.at(a)at.BioStrategist.dot.dot.com> wrote:
>> I've seen $250 humidity detecting fans (Broan?). I have a timer on my
>> bath fans, and motion detectors on my hallway lights (installed when my
>> dad was dying), so I can't believe they can't make a wall switch which
>> detects humidity. ANyone see one? Couldn't find one with google.
>> Besides the bathrooms, I'd wonder if I can't have one for the house when
>> I'm away and don't want to have the heat or cool on just to prevent
>> mildew. I hadn't used cooling in years and the upstairs duct perspired
>> onto my ceiling.
>
> Google on Humidistat.
>
> --
> *Change is inevitable, except from a vending machine*
>
> Dave Plowman dave(a)davenoise.co.uk London SW
> To e-mail, change noise into sound.


From: Jerry Avins on 12 Jun 2010 08:40
On 6/11/2010 4:01 PM, GregS wrote:

...

> Most mechanical sensors have the wrong connection for fan use.

I posted a link to one with a relay that sells for $40. Why won't that do?

Jerry
--
Engineering is the art of making what you want from things you can get.
�����������������������������������������������������������������������
From: Frank L on 13 Jun 2010 15:13
On Jun 10, 8:15 am, vjp2...(a)at.BioStrategist.dot.dot.com wrote:
> I've seen $250 humidity detecting fans (Broan?). I have a timer on my bath
> fans, and motion detectors on my hallway lights (installed when my dad was

snip.

I have seen a humidty switch with a central AC theromstat. It was in
an older home. I am not sure if they still offer them. It was either
Broan or Honeywell.

Frank Lardino
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