Discuss Can i use a Reed switch to detect if my motor is spinning? in the Electrical Forum area at ElectriciansForums.net

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I will have to guess,then,that these are solid fuel or wood burners?

If so,this limits the extent of action,on having a fan fail,to input air restriction,audible or visual warning,on account of the complexities,of fitting a Halon system :cool:
 
Maybe then, you best bet is to find a fan with a built in hall sensor.
These fans have 3 wires. 2 for power and one generates pulses while the fan is rotating.
You could monitor these pulses to see if the fan has stopped or is not running at speed.
 
I will have to guess,then,that these are solid fuel or wood burners?

If so,this limits the extent of action,on having a fan fail,to input air restriction,audible or visual warning,on account of the complexities,of fitting a Halon system :cool:
PEG if I had to guess it would be gas
 
Maybe then, you best bet is to find a fan with a built in hall sensor.
These fans have 3 wires. 2 for power and one generates pulses while the fan is rotating.
You could monitor these pulses to see if the fan has stopped or is not running at speed.
good idea, ill talk to our fan manufacturer. they have to be a class 4 fan so they can withstand the heat
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I will have to guess,then,that these are solid fuel or wood burners?

If so,this limits the extent of action,on having a fan fail,to input air restriction,audible or visual warning,on account of the complexities,of fitting a Halon system :cool:
natural gas & propane
 
good idea, ill talk to our fan manufacturer. they have to be a class 4 fan so they can withstand the heat
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natural gas & propane

Ahhh,groovy,you have at least the shut-down or modulation option?

Just in case,you thought i was a bit mr.safety....we have a shoot-hut,with a woodstove,made,ironically,from an old propane cylinder,and last week,the wind got up a bit,and even though we shut the air-damper tight,the bottom third was glowing bright red ?
 
Ahhh,groovy,you have at least the shut-down or modulation option?

Just in case,you thought i was a bit mr.safety....we have a shoot-hut,with a woodstove,made,ironically,from an old propane cylinder,and last week,the wind got up a bit,and even though we shut the air-damper tight,the bottom third was glowing bright red ?
must have been nice and toasty!!! when we make wood stove we purpose fully over fire the crap out of them. external fans on them. ALLLL the wood. same with the gas stoves we purposefully find just before the air/gas saturation point and explode them multiple times.......... its the best bit about my job! :) the gas stoves have electronic valves with remotes and built in safety systems....
 
Reeds are very delicate temprametal mechanical devices ,
that require the correct actuating field for reliable operation.
Hall effect devices have no moving parts .
Mixing electronics and heat is a specialist design situation.
(Will my grill stay lit with no electricity for its cooling fan..)
 
We're not engineering a solution, we're responding with some food for thought for the OP rather than simply answering a flat 'No' to his original question. Benz had to discover how to make a car go, before quantifying the risks involved if it wouldn't then stop!

That's great. Unfortunately it has precisely zero relevance to machinery or product design in a modern, litigious world.

Engineers are a nightmare in risk assessment meetings. Always desperate to engineer the solution before you even know what you are trying to protect against. I should know, I am one.
 
Yes, easily, either as a go/no go signal or speed proportional voltage etc.
 
It's a simple job for whoever is designing the analog side of things. E.g. an F-to-V can be implemented by triggering a monostable with the pulses and rectifying and LPF'ing the output. But as SheffSimon points out, before getting to this level of detail one needs a lot more info on what it is trying to achieve, which isn't really practical on an open forum. We can knock ideas about at a conceptual level though .
 
With a view to keeping things simple again, might you look into a fan with an integral or attached centrifugal switch which closes when it is running at a high enough speed? Connect the contacts (Normally Open) on each fan and wire them in series and use this combined switch (Logical AND) to confirm all fans are running to cool the glass; and as the safety logic in the control of power to a gas valve for the burner? If any fan drops below speed or stops the gas is cut off.

https://www.google.com/search?q=fan....1.69i57j0.13861j0j8&sourceid=chrome&ie=UTF-8
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I'd also include a thermal trip device (my #7) in series with the power supply to the gas valve.
 
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