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Re: Relative Humidity Sensors
Look at Honeywell - they make a sensor with a linear amplified output - part
number is something like HIH-3605-A. They claim that they are
interchangeable, which means no calibration.
----- Original Message -----
From: Tom Droege <firstname.lastname@example.org>
Sent: 12 May 2000 00:16
Subject: Relative Humidity Sensors
> It looks like the basic scheme for measuring relative humidity is to use a
> capacitor sanwidch made up of two plates with a special polymer in
> As the polymer absorbes moisture, it's dielectric constant changes, and
> thus the capacity of the device. Unfortunately I am set up to measure
> voltage, not capacity. I know how to do deal with this type of device,
> not in the Mark IV. So the best suggestion is that of jamie who said go
> Radio Shack and buy their device. Unfortunately it has a digital meter on
> it. The hope would be that I can find inside where they have a voltage
> proportional to the RH. Hmmm! This is beginning to look like a bigger
> project than I would want.
> BTW, those interested can look at:
> and see that Bob Dubner's light on a mirror device is actually a
> Why to most of my search efforts for RH end up in Vantaa, Finland? The
> Vaisala Co. has a page showing their relative humidity in real time.
> like in Finland you discuss relative humidity instead of the Bulls.
> Tom Droege