Sensor question.

Joe · 18th September 2006, 18:03

As we all know when the sensors get moist they read lower. Does anyone know if that error is linear throughout the range, or is it geometric (? correct term - not a mathematician).

Some crude testing seems to indicate that the error increases as the po2 rises. If this is so, has anyone come up with a way to account for this error?
Or am I being too picky here?

Thanks.

Joe

Gibbon · 18th September 2006, 22:33

Quote: (Originally Posted by Joe)

As we all know when the sensors get moist they read lower. Does anyone know if that error is linear throughout the range, or is it geometric (? correct term - not a mathematician).

Some crude testing seems to indicate that the error increases as the po2 rises. If this is so, has anyone come up with a way to account for this error?
Or am I being too picky here?

Thanks.

Joe

Joe,

Look at this thread
http://www.rebreatherworld.com/megal...onitoring.html

There is a difference between getting water (condensation) on the hydrophobic membrane and having a high humidity on the wrong side of the membrane.

It seems to be worse in warm water diving than cold due to the higher humidity achieved.

I was told that there are some tables to make a manual correction to cell readings for humidity - perhaps someone can provide a link to those tables in the other thread??

Joe · 18th September 2006, 23:37

Thanks Gibbon!

After looking at it I recall seeing the thread. If my memory is correct the result was somewhat inconclusive. I'll re read it tonight and see if I missed anything.

Thanks again!

Quote: (Originally Posted by Gibbon)

Joe,

Look at this thread
http://www.rebreatherworld.com/megal...onitoring.html

There is a difference between getting water (condensation) on the hydrophobic membrane and having a high humidity on the wrong side of the membrane.

It seems to be worse in warm water diving than cold due to the higher humidity achieved.

I was told that there are some tables to make a manual correction to cell readings for humidity - perhaps someone can provide a link to those tables in the other thread??

18th September 2006, 18:03	#1 (permalink)
Joe Custom Title Allowed! Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Oct 2005 Location: Florida, USA Posts: 240	Sensor question. As we all know when the sensors get moist they read lower. Does anyone know if that error is linear throughout the range, or is it geometric (? correct term - not a mathematician). Some crude testing seems to indicate that the error increases as the po2 rises. If this is so, has anyone come up with a way to account for this error? Or am I being too picky here? Thanks. Joe
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18th September 2006, 22:33	#2 (permalink)
Gibbon Southern Monkey Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Aug 2005 Location: East Devon Posts: 226	Re: Sensor question. Quote: (Originally Posted by Joe) As we all know when the sensors get moist they read lower. Does anyone know if that error is linear throughout the range, or is it geometric (? correct term - not a mathematician). Some crude testing seems to indicate that the error increases as the po2 rises. If this is so, has anyone come up with a way to account for this error? Or am I being too picky here? Thanks. Joe Joe, Look at this thread http://www.rebreatherworld.com/megal...onitoring.html There is a difference between getting water (condensation) on the hydrophobic membrane and having a high humidity on the wrong side of the membrane. It seems to be worse in warm water diving than cold due to the higher humidity achieved. I was told that there are some tables to make a manual correction to cell readings for humidity - perhaps someone can provide a link to those tables in the other thread??
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18th September 2006, 23:37	#3 (permalink)
Joe Custom Title Allowed! Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Oct 2005 Location: Florida, USA Posts: 240	Re: Sensor question. Thanks Gibbon! After looking at it I recall seeing the thread. If my memory is correct the result was somewhat inconclusive. I'll re read it tonight and see if I missed anything. Thanks again! Quote: (Originally Posted by Gibbon) Joe, Look at this thread http://www.rebreatherworld.com/megal...onitoring.html There is a difference between getting water (condensation) on the hydrophobic membrane and having a high humidity on the wrong side of the membrane. It seems to be worse in warm water diving than cold due to the higher humidity achieved. I was told that there are some tables to make a manual correction to cell readings for humidity - perhaps someone can provide a link to those tables in the other thread??
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