Author Topic: Humidifier-Stopped working, no mist! how to test Piezo?  (Read 700 times)

0 Members and 1 Guest are viewing this topic.

Offline Aakash

  • Contributor
  • Posts: 11
  • Country: us
Humidifier-Stopped working, no mist! how to test Piezo?
« on: December 01, 2021, 05:12:01 pm »
My humidifier stopped working, there is no mist coming out of it. I can hear the fan is running.

Can anybody let me know how can I check if the piezo is working or if I should replace the piezo.

Any suggestions please help.
 

Offline Haenk

  • Frequent Contributor
  • **
  • Posts: 595
  • Country: de
Re: Humidifier-Stopped working, no mist! how to test Piezo?
« Reply #1 on: December 03, 2021, 11:17:04 am »
Not sure if this works, but maybe use a laserpointer and the piezo element as a "mirror" and project the laser dot. If the projected dot gets broader, when the cleaner is switched on, the piezo is working.
 

Online wraper

  • Supporter
  • ****
  • Posts: 14226
  • Country: lv
Re: Humidifier-Stopped working, no mist! how to test Piezo?
« Reply #2 on: December 03, 2021, 11:27:28 am »
Replacing transducer most likely won't help since the problem most likely is in electronics which are driving it. Unless it's electrically shorted or has visually observable damage, not likely there is anything wrong with it.
 

Offline Xenon

  • Contributor
  • Posts: 19
  • Country: nl
Re: Humidifier-Stopped working, no mist! how to test Piezo?
« Reply #3 on: December 03, 2021, 04:31:00 pm »
Those piezo thingies are also used in medical humidifiers. They fail when they run dry because of overheating (they are driven hard).
Often the failure is visible on the piezo surface. It has a discoloration in the center or the surface peels off (tiny blisters).
Do you see anything similar?
 

Offline Aakash

  • Contributor
  • Posts: 11
  • Country: us
Re: Humidifier-Stopped working, no mist! how to test Piezo?
« Reply #4 on: December 03, 2021, 06:06:30 pm »
There is no discoloration that I see of, is there any way to drive it externally with a function generator and get to know if it's working fine?
 

Offline james_s

  • Super Contributor
  • ***
  • Posts: 17417
  • Country: us
Re: Humidifier-Stopped working, no mist! how to test Piezo?
« Reply #5 on: December 03, 2021, 06:17:04 pm »
You could connect it to an audio amplifier, piezo elements are very commonly used as inexpensive tweeters.
 
The following users thanked this post: Aakash

Offline Aakash

  • Contributor
  • Posts: 11
  • Country: us
Re: Humidifier-Stopped working, no mist! how to test Piezo?
« Reply #6 on: December 03, 2021, 08:23:59 pm »
I don't have any idea to build an audio amplifier, do you have any base circuit that I can build?
 

Offline james_s

  • Super Contributor
  • ***
  • Posts: 17417
  • Country: us
Re: Humidifier-Stopped working, no mist! how to test Piezo?
« Reply #7 on: December 03, 2021, 08:56:29 pm »
Build? If you take 10 seconds to search with google you will find numerous circuits, but surely you already have some kind of audio device around? Or just buy a small amplifier module, you can get them for a few dollars or less.
 
The following users thanked this post: Aakash

Offline Renate

  • Super Contributor
  • ***
  • Posts: 1462
  • Country: us
Re: Humidifier-Stopped working, no mist! how to test Piezo?
« Reply #8 on: December 04, 2021, 01:36:42 pm »
I say that if it looks good, connect it to your scope and tap it lightly. You should see plenty of volts.
 


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf