What is used for sensing humidity?
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From: Don Lancaster on 23 Mar 2010 23:04 GregS wrote: > In article <u6ihq51fct66e4reaeh6nodj2kicte43qi(a)4ax.com>, Hammy <spam(a)spam.com> wrote: >> I've been goggling and all I've been finding is $50 to $100 plus, full >> modules what is just the sensor used in for example dehumidifiers? >> >> I'm considering rigging a switch to control a bathroom exhaust fan in >> my downstairs bathroom. > > I installed a bathroom fan. The fan is in the attic for reduced noise. All you hear is > sssshhhhh. I installed a hair humidstat in the old fan housing. I could not really set it > properly. On humid days it would just stay on. I was also looking for another wall > mounted unit that fits in a wall box. Currently I also have a timer controlling > the fan in parallel with the humidstat. The best solution is a condensation > sensor near the ceiling somewhere. I am also reconsidering how the fan exits > through the roof. i would like to keep that air in the house, and run it downwstairs, > especially since I have high radon levels with negative pressure. > > greg Horsehair. Or UNWASHED blond hair. -- Many thanks, Don Lancaster voice phone: (928)428-4073 Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552 rss: http://www.tinaja.com/whtnu.xml email: don(a)tinaja.com Please visit my GURU's LAIR web site at http://www.tinaja.com
From: mike on 24 Mar 2010 14:49 GregS wrote: > In article <hoai8d$5hu$1(a)usenet01.srv.cis.pitt.edu>, zekfrivo(a)zekfrivolous.com (GregS) wrote: >> In article <u6ihq51fct66e4reaeh6nodj2kicte43qi(a)4ax.com>, Hammy <spam(a)spam.com> >> wrote: >>> I've been goggling and all I've been finding is $50 to $100 plus, full >>> modules what is just the sensor used in for example dehumidifiers? >>> >>> I'm considering rigging a switch to control a bathroom exhaust fan in >>> my downstairs bathroom. >> I installed a bathroom fan. The fan is in the attic for reduced noise. All you >> hear is >> sssshhhhh. I installed a hair humidstat in the old fan housing. I could not >> really set it >> properly. On humid days it would just stay on. I was also looking for another >> wall >> mounted unit that fits in a wall box. Currently I also have a timer controlling >> the fan in parallel with the humidstat. The best solution is a condensation >> sensor near the ceiling somewhere. I am also reconsidering how the fan exits >> through the roof. i would like to keep that air in the house, and run it >> downwstairs, >> especially since I have high radon levels with negative pressure. >> > > I may have found what I wanted.......... > > http://www.dewstop.com/dewstop_bathroom_fan_switches.html > Looks like this turns on the fan when condensation starts to form on the walls. Isn't it too late by then?
From: Spehro Pefhany on 24 Mar 2010 20:59 On Tue, 23 Mar 2010 20:04:22 -0700, the renowned Don Lancaster <don(a)tinaja.com> wrote: >GregS wrote: >> In article <u6ihq51fct66e4reaeh6nodj2kicte43qi(a)4ax.com>, Hammy <spam(a)spam.com> wrote: >>> I've been goggling and all I've been finding is $50 to $100 plus, full >>> modules what is just the sensor used in for example dehumidifiers? >>> >>> I'm considering rigging a switch to control a bathroom exhaust fan in >>> my downstairs bathroom. >> >> I installed a bathroom fan. The fan is in the attic for reduced noise. All you hear is >> sssshhhhh. I installed a hair humidstat in the old fan housing. I could not really set it >> properly. On humid days it would just stay on. I was also looking for another wall >> mounted unit that fits in a wall box. Currently I also have a timer controlling >> the fan in parallel with the humidstat. The best solution is a condensation >> sensor near the ceiling somewhere. I am also reconsidering how the fan exits >> through the roof. i would like to keep that air in the house, and run it downwstairs, >> especially since I have high radon levels with negative pressure. >> >> greg > > >Horsehair. >Or UNWASHED blond hair. aka horsehair with a "W". Best regards, Spehro Pefhany -- "it's the network..." "The Journey is the reward" speff(a)interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com
From: GregS on 25 Mar 2010 10:00 In article <hodmrl$qp$2(a)news.eternal-september.org>, spamme0(a)go.com wrote: >GregS wrote: >> In article <hoai8d$5hu$1(a)usenet01.srv.cis.pitt.edu>, > zekfrivo(a)zekfrivolous.com (GregS) wrote: >>> In article <u6ihq51fct66e4reaeh6nodj2kicte43qi(a)4ax.com>, Hammy > <spam(a)spam.com> >>> wrote: >>>> I've been goggling and all I've been finding is $50 to $100 plus, full >>>> modules what is just the sensor used in for example dehumidifiers? >>>> >>>> I'm considering rigging a switch to control a bathroom exhaust fan in >>>> my downstairs bathroom. >>> I installed a bathroom fan. The fan is in the attic for reduced noise. All > you >>> hear is >>> sssshhhhh. I installed a hair humidstat in the old fan housing. I could not >>> really set it >>> properly. On humid days it would just stay on. I was also looking for > another >>> wall >>> mounted unit that fits in a wall box. Currently I also have a timer > controlling >>> the fan in parallel with the humidstat. The best solution is a condensation >>> sensor near the ceiling somewhere. I am also reconsidering how the fan exits >>> through the roof. i would like to keep that air in the house, and run it >>> downwstairs, >>> especially since I have high radon levels with negative pressure. >>> >> >> I may have found what I wanted.......... >> >> http://www.dewstop.com/dewstop_bathroom_fan_switches.html >> > >Looks like this turns on the fan when condensation starts to form on the >walls. >Isn't it too late by then? But if you have a dummy guest in the house and they forget to turn the fan on, then you have some relief. greg
From: Hammy on 25 Mar 2010 09:16
On Thu, 25 Mar 2010 14:00:34 GMT, zekfrivo(a)zekfrivolous.com (GregS) wrote: > >But if you have a dummy guest in the house and they >forget to turn the fan on, then you have some relief. > >greg This looks like it would be the best solutions. The output is conditioned and fairly linear. You could use a comparator to flip a relay or SSR at a set voltage level/ RH. http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=480-3166-1-ND Fortunately I found a way to get a wire to where the light switch is requiring only a small amount of drywall to be cut out. So I can just wire it normally to a switch by the door. I'm just pulling the staples out along the wall stud and attaching 4 conductor awg14 to the existing wiring and pulling it through the holes in the ceiling joist to the light and the fan. Works for me only one small vertical cut of drywall needs to be patched in and the smallest wall repainted. Can you tell I really hate drywall. Actually not the drywall part its the sanding, that fine dust gets all through the house and ductwork its a PITA. |