Digital bionaire calibration

ccpyue

I have a digital bionaire for humidity monitoring. I found it is around 18% lower than the actual relative humidity in my house. Can anyone tell me how can I adjust it by moving the digit forward? I have attached photos on this bionaire, it front and back. Thank you.

Attached Thumbnails

   

bob22

Anything that looks like a screw head that can be turned (potentiometer)? Perhaps on the side of the tan screw block in second picture?

ccpyue

Look through the whole circuit board, front, back and sides, nothing can be manually adjust.

jlmran

How did you verify the inaccuracy? Just curious.

Also, Does this unit use a dry and wet bulb which is serviceable?

ccpyue

http://www.ehow.com/how_6075865_test...ty-levels.html

Learn from above site.


No dry/wet bulb. It use something like a sensor. No manual adjustable can be found.

Jackofall1

There really is only one tried and true way to verify humidity and that is the comparison of wet and dry bulb temperatures.

A simple sling psychrometer is the best a most reliable instrument to do comparitive calibraition of electronic instrumentation.

It appears that the unit that you are looking at is not capable of calibration.

Mark

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ccpyue

This is only a home use gauge. As long as it close enought to tell me the humidity will be alright. But now, it is 16% lower than the actual one (or +/- actual one), so I wish to adjust my gauge to or close to that.

Jackofall1

Off from the actual one, what is the actual one and is it accurate? Hence the suggestion for a sling psychrometer.

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