From: Spehro Pefhany
Subject: Re: Humidity sensor - peculiar behavior
References: <firstname.lastname@example.org> <email@example.com>
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Date: Wed, 08 Jan 2003 13:26:17 GMT
NNTP-Posting-Date: Wed, 08 Jan 2003 08:26:17 EST
On Wed, 8 Jan 2003 09:37:17 +0000, the renowned John Woodgate
>I read in sci.electronics.design that Steve Turner
> wrote (in firstname.lastname@example.org>) about 'Humidity sensor - peculiar behavior', on Wed, 8 Jan
>>But what its temperature
>>is -- sheesh, I don't know.
>You can measure it with a fine wire thermocouple. 'Fine wire' to
>minimise its response time. You can make your own copper-constantan
>couples cheaply if you can find a source of the constantan wire, which
>should not be difficult. 40 uV per kelvin.
Though if you are the fussy sort, remember that there are at least
two common alloys called Constantan used in thermocouples in North
America, and the copper should be nice electrolytic stuff too.
>Alternatively, a humidity sensor makes an excellent thermometer. (;-)
Apparently. 8-( Just about everything is.
Is there some authoritative reference on making calibration cells
for humidity sensors? It must be a common problem, uncalibrated
sensors are much more common and cheaper than calibrated ones.
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