What is used for sensing humidity?
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From: Hammy on 23 Mar 2010 09:58 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.
From: GregS on 23 Mar 2010 11:12 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
From: GregS on 23 Mar 2010 11:17 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
From: Greg Neill on 23 Mar 2010 10:18 Hammy 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. Humidistat. Check out the Honeywell H8908B1002 carried by Home Depot ($26.97): http://www.homedepot.com/webapp/wcs/stores/servlet/ProductDisplay?storeId=10051&langId=-1&catalogId=10053&productId=100476731&N=10000003+90401+502315 An applications sheet at: http://www.honeywell-thermostat.com/manuals/h8908b1002.pdf
From: Spehro Pefhany on 23 Mar 2010 10:31
On Tue, 23 Mar 2010 09:58:51 -0400, 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? They don't use "sensors" in cheap humidifiers. Try searching for "humidistat". They're electromechanical devices. In the old days, horsehair was used, nowadays a hygroscopic polymer (eg. Nylon aka polyamide) is used. >I'm considering rigging a switch to control a bathroom exhaust fan in >my downstairs bathroom. |