What The Hell Is That?!

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Speaking of hair dryers, that switching cycle rating might be entirely adequate for its application. Funny thing with safety / protection stuff is that high MTBF is more P2, while 'failing safe' is more P1.

Anyway, after I use my hair dryer lately, a few seconds after I set it down, I hear a distinct 'click'. If I remain, I'll soon hear another 'click'. It's operating too hot, and when the forced air cooling is shut down, the heat rise trips the OT thermal cutout switch, which then resets after just a bit of natural convection cooling. The intake grille is obstructed by dust accumulation, and I need to get off my rear and take it outside and clean the grille. The cobbler's kids got no shoes;-)
Oh I hear ya, aznsx. My hair dryer does the same thing. I usually run it on high fan with no heat for a few moments after I'm done using it to help with the cool-down. And I've had the thermal cutoff activate a couple of times. It's good to know that it's in there.
 
A hair dryer?! What the hell is that?! 🤓

Oh yeah, now I remember. I haven't used one of those for probably going on 15 years now. :yellowlaugh:

Ya'll quit bragging on still needing a hair dryer. :D
Man saves a small fortune on shampoo every year...

**aerodynamics for top down weather driving.
 
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Dang CG, you're cookin' on the front burner today;-)

'NO' is usually the minority app for such components (vs 'NC'), as components of this sort are most often used to protect something in an out of bounds condition rather than control something operating normally (in the interest of 'failing safe' / failing 'open'), but they do make 'em. I note that the 'switching cycles' spec ain't that high either. As you alluded to PW, whatever the something is, it could also be a defective something, and it may never change state again;-)
One use for a NO sensor is controlling a fuel flow. If the flame goes out, the burner cools, the sensor opens, which releases the solenoid holding the fuel valve open.
 
Speaking of hair dryers, that switching cycle rating might be entirely adequate for its application. Funny thing with safety / protection stuff is that high MTBF is more P2, while 'failing safe' is more P1.

Anyway, after I use my hair dryer lately, a few seconds after I set it down, I hear a distinct 'click'. If I remain, I'll soon hear another 'click'. It's operating too hot, and when the forced air cooling is shut down, the heat rise trips the OT thermal cutout switch, which then resets after just a bit of natural convection cooling. The intake grille is obstructed by dust accumulation, and I need to get off my rear and take it outside and clean the grille. The cobbler's kids got no shoes;-)
Whenever I go to a hotel or motel I check the screens on the hair dryer and through the wall HVAC. The majority of the time they're clogged up. A quick pick off of the dryer screen crud, rinse it off in the sink, then wash the HVAC screens off in the shower.

They work much better without the restricted airflow. Most of those places only clean those when they're to the point of not working at all.
 
One use for a NO sensor is controlling a fuel flow. If the flame goes out, the burner cools, the sensor opens, which releases the solenoid holding the fuel valve open.
Sounds like my prior life with large industrial multi-zone gas-fired ovens and furnaces. Any glitch from a burner 'flame rod' signal and those Honeywell controllers start slammin' gas valves closed. I hate that sound. It usually meant my night wasn't going well;-)
 
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Once again, it's time to play - What The Hell Is That!?

I found this on our kitchen table.
 
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