What is used for sensing humidity?
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From: JosephKK on 27 Mar 2010 08:28 On Tue, 23 Mar 2010 15:12:12 GMT, 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. Have you considered adding an occupancy sensor so that it can only run while someone is there and continuing about 15 minutes afterward? >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: JosephKK on 27 Mar 2010 08:33 On Tue, 23 Mar 2010 08:53:43 -0700, Jim Thompson <To-Email-Use-The-Envelope-Icon(a)On-My-Web-Site.com> wrote: >On Tue, 23 Mar 2010 11:26:38 -0400, Spehro Pefhany ><speffSNIP(a)interlogDOTyou.knowwhat> wrote: > >>On Tue, 23 Mar 2010 07:37:33 -0700, Jim Thompson >><To-Email-Use-The-Envelope-Icon(a)On-My-Web-Site.com> wrote: >> >>>On Tue, 23 Mar 2010 15:17:14 GMT, zekfrivo(a)zekfrivolous.com (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 >>> >>>Just measure light reflection from a mirror ?:-) >>> >>> ...Jim Thompson >> >>Servo the mirror temperature to control the condensation and you can >>directly measure dew point. > >Yep. As I posted _earlier_ today :-) > > ...Jim Thompson True, but that system bay be maintenance intensive. Contaminants will accumulate on the mirror. I know, had some "gotcha" moments in the lab.
From: Jim Thompson on 27 Mar 2010 11:27 On Sat, 27 Mar 2010 05:33:50 -0700, "JosephKK"<quiettechblue(a)yahoo.com> wrote: >On Tue, 23 Mar 2010 08:53:43 -0700, Jim Thompson <To-Email-Use-The-Envelope-Icon(a)On-My-Web-Site.com> wrote: > >>On Tue, 23 Mar 2010 11:26:38 -0400, Spehro Pefhany >><speffSNIP(a)interlogDOTyou.knowwhat> wrote: >> >>>On Tue, 23 Mar 2010 07:37:33 -0700, Jim Thompson >>><To-Email-Use-The-Envelope-Icon(a)On-My-Web-Site.com> wrote: >>> >>>>On Tue, 23 Mar 2010 15:17:14 GMT, zekfrivo(a)zekfrivolous.com (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 >>>> >>>>Just measure light reflection from a mirror ?:-) >>>> >>>> ...Jim Thompson >>> >>>Servo the mirror temperature to control the condensation and you can >>>directly measure dew point. >> >>Yep. As I posted _earlier_ today :-) >> >> ...Jim Thompson > >True, but that system bay be maintenance intensive. Contaminants will >accumulate on the mirror. I know, had some "gotcha" moments in the lab. But the whole "system" isn't needed. All you do is run the fan when you get condensation on the mirror with, perhaps, a timer to have it run for some time after the condensation disappears. Or simply a door switch. Door closed, fan runs, for X minutes after door opens. ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | The only thing bipartisan in this country is hypocrisy
From: JosephKK on 28 Mar 2010 10:58 On Sat, 27 Mar 2010 08:27:21 -0700, Jim Thompson <To-Email-Use-The-Envelope-Icon(a)On-My-Web-Site.com> wrote: >On Sat, 27 Mar 2010 05:33:50 -0700, >"JosephKK"<quiettechblue(a)yahoo.com> wrote: > >>On Tue, 23 Mar 2010 08:53:43 -0700, Jim Thompson <To-Email-Use-The-Envelope-Icon(a)On-My-Web-Site.com> wrote: >> >>>On Tue, 23 Mar 2010 11:26:38 -0400, Spehro Pefhany >>><speffSNIP(a)interlogDOTyou.knowwhat> wrote: >>> >>>>On Tue, 23 Mar 2010 07:37:33 -0700, Jim Thompson >>>><To-Email-Use-The-Envelope-Icon(a)On-My-Web-Site.com> wrote: >>>> >>>>>On Tue, 23 Mar 2010 15:17:14 GMT, zekfrivo(a)zekfrivolous.com (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 >>>>> >>>>>Just measure light reflection from a mirror ?:-) >>>>> >>>>> ...Jim Thompson >>>> >>>>Servo the mirror temperature to control the condensation and you can >>>>directly measure dew point. >>> >>>Yep. As I posted _earlier_ today :-) >>> >>> ...Jim Thompson >> >>True, but that system bay be maintenance intensive. Contaminants will >>accumulate on the mirror. I know, had some "gotcha" moments in the lab. > >But the whole "system" isn't needed. All you do is run the fan when >you get condensation on the mirror with, perhaps, a timer to have it >run for some time after the condensation disappears. > >Or simply a door switch. Door closed, fan runs, for X minutes after >door opens. > > ...Jim Thompson That still does not stop the mirror from getting dirty. It will only slow it down a little. Consider the rest of the mirrors and glass in your house, and the regular cleaning applied there.
From: Jim Thompson on 28 Mar 2010 11:06
On Sun, 28 Mar 2010 07:58:46 -0700, "JosephKK"<quiettechblue(a)yahoo.com> wrote: >On Sat, 27 Mar 2010 08:27:21 -0700, Jim Thompson <To-Email-Use-The-Envelope-Icon(a)On-My-Web-Site.com> wrote: > >>On Sat, 27 Mar 2010 05:33:50 -0700, >>"JosephKK"<quiettechblue(a)yahoo.com> wrote: >> >>>On Tue, 23 Mar 2010 08:53:43 -0700, Jim Thompson <To-Email-Use-The-Envelope-Icon(a)On-My-Web-Site.com> wrote: >>> >>>>On Tue, 23 Mar 2010 11:26:38 -0400, Spehro Pefhany >>>><speffSNIP(a)interlogDOTyou.knowwhat> wrote: >>>> >>>>>On Tue, 23 Mar 2010 07:37:33 -0700, Jim Thompson >>>>><To-Email-Use-The-Envelope-Icon(a)On-My-Web-Site.com> wrote: >>>>> >>>>>>On Tue, 23 Mar 2010 15:17:14 GMT, zekfrivo(a)zekfrivolous.com (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 >>>>>> >>>>>>Just measure light reflection from a mirror ?:-) >>>>>> >>>>>> ...Jim Thompson >>>>> >>>>>Servo the mirror temperature to control the condensation and you can >>>>>directly measure dew point. >>>> >>>>Yep. As I posted _earlier_ today :-) >>>> >>>> ...Jim Thompson >>> >>>True, but that system bay be maintenance intensive. Contaminants will >>>accumulate on the mirror. I know, had some "gotcha" moments in the lab. >> >>But the whole "system" isn't needed. All you do is run the fan when >>you get condensation on the mirror with, perhaps, a timer to have it >>run for some time after the condensation disappears. >> >>Or simply a door switch. Door closed, fan runs, for X minutes after >>door opens. >> >> ...Jim Thompson > >That still does not stop the mirror from getting dirty. It will only >slow it down a little. Consider the rest of the mirrors and glass in >your house, and the regular cleaning applied there. Yep. Every two weeks the cleaning lady comes with her three sisters and they swarm thru the house cleaning everything that doesn't bite :-) ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | The only thing bipartisan in this country is hypocrisy |