Hi,
I'm trying to make a humidity control circuit for a greenhouse but i am unable to find a datasheet for the philips 2322-691-90001 humidity sensor or the meggitt HIS02 humidity sensor. Please help!!
thank you

 

Here is the philips sensor

Link

 

so all this is is a capaictor who's capacitance varies with respect to humidity correct?

can someone draw up a simple schematic showing me how this would be used to put out some sort of voltage.

What if i wanted to put out an analog dc voltage with respect to the current humidity. How would i do this.

Also why should it not be exposed to aceton or chlorine? What if you put this device outside next to a swimming pool and the chlorine vapors from the pool got on it. Would it immediatley stop working or would it gradually breakdown over time.

How sensitive is it?
if i wanted to use it to control a switch. For example if i was running a de-humidifier and wanted it to turn off a switch when the humidity reached less than 1%. Would it be able to determin if there is humidity 3 feet in front of it.

Humidity is the amount of moisture in the air right?

 

Yes, many humidity sensors act as capacitors in a circuit. There are some more expensive "integrated" ones such as the sensiron parts. You can use the sensor in most any circuit that could use a capacitor. A simple example would be to build an oscillator with a 555 using the sensor to vary the frequency (and as a result the pulse width). Then trigger another 555 in monostable mode, you can just lowpass filter the output of the second 555 and there is your analog voltage.

 

Hi, I am trying to use a philips 691-90001 humidity sensor to create a humidity control system of design paper. However, I dun have much information on it, so if anyone who can help or provide me information, feel free to leave me message.
Thank you

 

I believe this is the same part that began this thread .... I posted a link to the datasheet a few posts back.

 

Also you can try out this great temperature/humidity sensor:

http://www.sensirion.com/en/sensors/...ty/default.htm