Problems with humidity sensors

	Problems with humidity sensors

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Subject

Author

Date

Problems with humidity sensors

Dave M.

07-05-2006

Re: Problems with humidity sensors

DIDO

07-06-2006

Re: Problems with humidity sensors

Dave M.

07-06-2006

Re: Problems with humidity sensors

DIDO

07-08-2006

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Posted by Dave M. on July 5, 2006, 11:24 pm

Last year I bought and returned 5 dehumidifiers. As I tried each one for
a time in the
basement, they eventually failed. The failure was the readout value and
functionality of the humidistat in all but one unit, which simply rattled
too much. Something had to be wrong with the environment, right? Well,
this
year, using a soap solution, I found four slow natural gas leaks at the
black pipe, all of which I then fixed. I bought another Dehumidifier (a
GE
unit). "Knock-on-wood" this dehumidifier has not failed.

I think the Natural gas was the source of pollution that permeated the
humidity sensors polymer substrate in each dehumidifier.

A search yielded this text:

Chemical vapors may interfere with materials used for the humidity
sensor.
The diffusion of chemicals into the sensor's polymer may cause a shift in
both offset and sensitivity. In a clean environment the contaminants will
slowly dissipate. High levels of pollutants may cause permanent damage to
the humidity sensor's polymer.

Has anyone experienced repeated dehumidifier failures like I have?

Thanks,

Dave M.

Posted by DIDO on July 6, 2006, 2:34 pm

Dave you want good quality RH meter
get industrial grade made by Vaisala ,Rotronics and HyCal
These are the manufacture however they also put some other
name on.
Good luck Dido

> Last year I bought and returned 5 dehumidifiers. As I tried each one for

> a time in the

> basement, they eventually failed. The failure was the readout value and

> functionality of the humidistat in all but one unit, which simply rattled

> too much. Something had to be wrong with the environment, right? Well,

> this

> year, using a soap solution, I found four slow natural gas leaks at the

> black pipe, all of which I then fixed. I bought another Dehumidifier (a

> GE

> unit). "Knock-on-wood" this dehumidifier has not failed.

> I think the Natural gas was the source of pollution that permeated the

> humidity sensors polymer substrate in each dehumidifier.

> A search yielded this text:

> Chemical vapors may interfere with materials used for the humidity

> sensor.

> The diffusion of chemicals into the sensor's polymer may cause a shift in

> both offset and sensitivity. In a clean environment the contaminants will

> slowly dissipate. High levels of pollutants may cause permanent damage to

> the humidity sensor's polymer.

> Has anyone experienced repeated dehumidifier failures like I have?

> Thanks,

> Dave M.

Posted by Dave M. on July 6, 2006, 9:32 pm

> Dave you want good quality RH meter

> get industrial grade made by Vaisala ,Rotronics and HyCal

> These are the manufacture however they also put some other

> name on.

> Good luck Dido

>> Last year I bought and returned 5 dehumidifiers. As I tried each one

>> for a time in the

>> basement, they eventually failed. The failure was the readout value

>> and functionality of the humidistat in all but one unit, which simply

>> rattled too much. Something had to be wrong with the environment,

>> right? Well, this

>> year, using a soap solution, I found four slow natural gas leaks at

>> the black pipe, all of which I then fixed. I bought another

>> Dehumidifier (a GE

>> unit). "Knock-on-wood" this dehumidifier has not failed.

>> I think the Natural gas was the source of pollution that permeated

>> the humidity sensors polymer substrate in each dehumidifier.

>> A search yielded this text:

>> Chemical vapors may interfere with materials used for the humidity

>> sensor.

>> The diffusion of chemicals into the sensor's polymer may cause a

>> shift in both offset and sensitivity. In a clean environment the

>> contaminants will slowly dissipate. High levels of pollutants may

>> cause permanent damage to the humidity sensor's polymer.

>> Has anyone experienced repeated dehumidifier failures like I have?

>> Thanks,

>> Dave M.

Dido,

What I have been doing is use three humidity meters. One that is digital
, a wet bulb hygrometer and an analog hygrometer (that I calibrated
against the wet bulb hygrometer). The wet bulb hygrometer is accurate and
repeatable when used properly.

... but the main problem is that the humidistat has failed on each
dehumidifier. I'm trying to find someone who has had multiple
dehumidifier failures due to the failure of the humidistat sensor and did
that person find out there was a polution source causing that failure.

Dave M.

Posted by DIDO on July 8, 2006, 9:49 pm

>> Dave you want good quality RH meter

>> get industrial grade made by Vaisala ,Rotronics and HyCal

>> These are the manufacture however they also put some other

>> name on.

>> Good luck Dido

>>> Last year I bought and returned 5 dehumidifiers. As I tried each one

>>> for a time in the

>>> basement, they eventually failed. The failure was the readout value

>>> and functionality of the humidistat in all but one unit, which simply

>>> rattled too much. Something had to be wrong with the environment,

>>> right? Well, this

>>> year, using a soap solution, I found four slow natural gas leaks at

>>> the black pipe, all of which I then fixed. I bought another

>>> Dehumidifier (a GE

>>> unit). "Knock-on-wood" this dehumidifier has not failed.

>>>

>>> I think the Natural gas was the source of pollution that permeated

>>> the humidity sensors polymer substrate in each dehumidifier.

>>>

>>> A search yielded this text:

>>>

>>> Chemical vapors may interfere with materials used for the humidity

>>> sensor.

>>> The diffusion of chemicals into the sensor's polymer may cause a

>>> shift in both offset and sensitivity. In a clean environment the

>>> contaminants will slowly dissipate. High levels of pollutants may

>>> cause permanent damage to the humidity sensor's polymer.

>>>

>>> Has anyone experienced repeated dehumidifier failures like I have?

>>>

>>> Thanks,

>>>

>>> Dave M.

>>>

> Dido,

> What I have been doing is use three humidity meters. One that is digital

> , a wet bulb hygrometer and an analog hygrometer (that I calibrated

> against the wet bulb hygrometer). The wet bulb hygrometer is accurate and

> repeatable when used properly.

> ... but the main problem is that the humidistat has failed on each

> dehumidifier. I'm trying to find someone who has had multiple

> dehumidifier failures due to the failure of the humidistat sensor and did

> that person find out there was a polution source causing that failure.

> Dave M.

Sorry can not help you there
Dido

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