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Food&Fish
PostPosted: Jan 11th, '08, 14:42 
Seriously, this cant be healthy.
Seriously, this cant be healthy.
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What do they use for water level on washing machines And dishwashers we have never had a flood in 40 years
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Sleepe
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PostPosted: Jan 11th, '08, 14:42 
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What about temps though?

And please KP go to Boris's thread and help convince him.
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KudaPucat
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PostPosted: Jan 11th, '08, 14:52 
Seriously, this cant be healthy.
Seriously, this cant be healthy.
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Sleepe, I did already :-)

F&F they would use a float I am sure, behind a nice filter to make sure it could never get gummed up.
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heka
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PostPosted: Jan 11th, '08, 14:55 
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TimC wrote:
Just thought I'd post my electronic version of the water level sensor.

It uses a MPX2010DP differential pressure sensor. This component is the size of a fifty cent piece. You connect a piece of flexible black airline to the pressure sensor and the other end is fixed near the bottom of the GB. As the GB fills up the pressure of the air increases in the tube. Using a simple circuit you can compare the pressure in the tube with that of the open air and then determine how full the GB is. A few calculations could actually tell you the depth of water in centimetres.

Pumps or valves can then be controlled or alarms set if any issues arise.


Differental (water) pressure sensors are used in top loading washing mashines. Some have 3 settings low/medium/high.
You could possible pull one out of an old washing machine.
heka
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KudaPucat
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PostPosted: Jan 11th, '08, 14:58 
Seriously, this cant be healthy.
Seriously, this cant be healthy.
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Cheers Heka, I didn't know that.
Hey, they'd be already rigged to run a 240V pump, albeit a small one... hmmmmmmmm
so add a contactor or a relay if we're being cheap and voila.
Nice.
So... how many people are going to be raiding the tip? F&F for sure... :-D
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heka
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PostPosted: Jan 11th, '08, 15:00 
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TimC wrote:
Just thought I'd post my electronic version of the water level sensor.

It uses a MPX2010DP differential pressure sensor. This component is the size of a fifty cent piece. You connect a piece of flexible black airline to the pressure sensor and the other end is fixed near the bottom of the GB. As the GB fills up the pressure of the air increases in the tube. Using a simple circuit you can compare the pressure in the tube with that of the open air and then determine how full the GB is. A few calculations could actually tell you the depth of water in centimetres.

Pumps or valves can then be controlled or alarms set if any issues arise.


Differental (water) pressure sensors are used in top loading washing mashines. Some have 3 settings low/medium/high.
You could possible pull one out of an old washing machine.
heka
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Sleepe
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PostPosted: Jan 11th, '08, 15:03 
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Neat Heka,

Think there's one in the shed. One more thing to pull out of broken machines :wink:
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steem
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PostPosted: Jan 11th, '08, 15:26 
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hmmm
highest pressure on the charts atm is 1025 hPa, out west of perth and in NZ.
victoria 2005 got down to 990:
http://www.bom.gov.au/announcements/sev ... ndex.shtml
TC Helen this year 975 (although you'd be wondering where your system went, or it would be flooded):
http://www.bom.gov.au/announcements/sev ... 1231.shtml

so a range of 30 hPa would not be overly conservative...that's 3%!

Edit: wow, I'm slow...obviously water pressure relative to atmosphere is easy to deal with, and the absolute atmospheric pressure is irrelevant :)
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KudaPucat
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PostPosted: Jan 11th, '08, 15:31 
Seriously, this cant be healthy.
Seriously, this cant be healthy.
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yes... hmmm
however heka posted the following:
heka wrote:
differential pressure sensor.

hence it compares the pressure of the water to whatever the ambient is now. It measures the differential, not the absolute against a constant.
This makes a lot more sense. I don't know why I didn't think of it when I posted those figures.... And I call myself an Engineer :oops:
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steem
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PostPosted: Jan 11th, '08, 15:37 
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Quote:
hence it compares the pressure of the water to whatever the ambient is now. It measures the differential, not the absolute against a constant.


...and hence my edit :)

at least you wouldn't have done course after mind-numbing (but interesting) course on hydraulics :oops:
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Sleepe
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PostPosted: Jan 11th, '08, 15:47 
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BTW Thanks Jimmy even though this has gone 'somewhat' off track its always nice to have new ideas.
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heka
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PostPosted: Jan 11th, '08, 15:54 
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Hi KudaP re: washing machine waterlevel (pressure sensor) >> in the washing machine it is attached to a microswitch (240v) you could use the same switch or install a 12v switch instead
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Stuart Chignell
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PostPosted: Jan 11th, '08, 16:44 
Seriously, this cant be healthy.
Seriously, this cant be healthy.
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10 meters of water is roughly equivalent to air pressure.


Do you mean by that KP that if I were 10m underwater I'd be experiencing double the pressure at the surface?
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veggie boy
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PostPosted: Jan 11th, '08, 21:19 
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I don't understand some of what you lot are saying - and maybe you are saying what I am about to say - but I believe that the way the washing machine ones work is that a tube goes into the water zone. As the water rises - the air in the tube pressurises and activates the switch.
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KudaPucat
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PostPosted: Jan 12th, '08, 00:30 
Seriously, this cant be healthy.
Seriously, this cant be healthy.
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Stuart Chignell wrote:
Do you mean by that KP that if I were 10m underwater I'd be experiencing double the pressure at the surface?

Exactly, and 20m under it will be tripple, and 30, quadrupal etc
At 40m it will be 5 times, giving nitrogen a partial pressure of ~2 which makes it a very strong inebriating agent. - the advantage is instant sobriety as you go shallower than 30m
At 100m it will be 11 times, giving oxygen a partial pressure of ~2, and you will die within minutes if exposed to that kind of atmosphere.

hmmm I went a touch off topic huh?

Would 'yes' have been good enough Stuart?
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