blowing the sensor with diluant

**jmurba** · 18th November 2007, 20:04

Hi all
I read on the web that some divers are blowing diluant on the sensors in order to get rid of the vapor/films and to check the sensors. : Inspration Modification
Has anybody tried that here down ?
Does it works ?
isnt' it harmfull for the sensors ?
regards
jean mi

ardhill · 18th November 2007, 21:44

Hi

Isn't this what the Pelagian does?
Oxygen sensor validation - Pelagian DCCCR closed circuit rebreather

Maybe ask on that part of the forum, you may get some helpful information?

Mark Chase · 18th November 2007, 21:49

Quote: (Originally Posted by jmurba)

Hi all
I read on the web that some divers are blowing diluant on the sensors in order to get rid of the vapor/films and to check the sensors. : Inspration Modification
Has anybody tried that here down ?
Does it works ?
isnt' it harmful for the sensors ?
regards
jean mi

Its an old mod they did to blow water off the face off the cells and get a better cell reaction reading. Then AP started putting hydrophobic membranes on the cell faces and it kind of lost favor.

There was also some concern about the jet of air blasting the water through the cell membrane.

I haven't read about anyone doing it recently

ATB

Mark

**Dave Sutton** · 18th November 2007, 22:42

Being the one who did what was cited in the article by the first poster:

This was first done on the CIS's to allow the diver to verify the sensor dynamics. It's a good thing to be able to do. I did the one that the article was written about at the request of Chris Gregory for his Inspiration during a period in which Inspiration divers were dropping like flies. The one I did for him worked great, and had only sufficient volume to gently "puff" the sensor. Anyone who was "concerned" about damage to the sensors never saw the system.

This is still a very valid safety tool, and ought to be studied.

Dave

ChristianM · 19th November 2007, 07:09

Also the new Poseidon MKVI is doing this to ensure a dry sensor and to validate the readings.

Cheers!
Christian

**jmurba** · 19th November 2007, 08:42

Mark dave and others
Thanks for info,
I wonder if the gas blown is actually drying the sensor face or moving the vapor/film away ?
how hard is the gas "jet" ?
regards
jean mi

**jmurba** · 19th November 2007, 13:13

Quote: (Originally Posted by ardhill)

Hi

Isn't this what the Pelagian does?
Oxygen sensor validation - Pelagian DCCCR closed circuit rebreather

Maybe ask on that part of the forum, you may get some helpful information?

it would be great if a pelagian rebreather diver could tell us if it works good and if these injections are not bad for the sensors.

**Dave Sutton** · 19th November 2007, 15:12

Quote: (Originally Posted by jmurba)

Mark dave and others
Thanks for info,
I wonder if the gas blown is actually drying the sensor face or moving the vapor/film away ?
how hard is the gas "jet" ?
regards
jean mi

It's doing both... drying and validating.

The velocity was low and the flow was low... I never measured it, but maximim perhaps 4 litres per minute? It's the velocity that is the issue for a sensor, and that was fairly low due to the rather large orifices in the nozzle at the sensor faces. In addition, the nozzle was about 2.5 CM from the sensors.

There is *zero doubt* that this system works. That's not suject to debate. It does not harm the sensors. Is it needed? That's the only question.

Dave

**jmurba** · 19th November 2007, 18:51

Quote: (Originally Posted by Dave Sutton)

It's doing both... drying and validating.

The velocity was low and the flow was low... I never measured it, but maximim perhaps 4 litres per minute? It's the velocity that is the issue for a sensor, and that was fairly low due to the rather large orifices in the nozzle at the sensor faces. In addition, the nozzle was about 2.5 CM from the sensors.

There is *zero doubt* that this system works. That's not suject to debate. It does not harm the sensors. Is it needed? That's the only question.

Dave

Hi dave
if there is zero doubt then sûre it is needed, it replaces a big flush of the circuit, and save dil that can b useful for oc bail out and other uses.
did u use a fixed MP reg or a normal reg to feed the "blower ?
regards
jean mi

**Dave Sutton** · 19th November 2007, 20:56

Quote: (Originally Posted by jmurba)

Hi dave
if there is zero doubt then sûre it is needed, it replaces a big flush of the circuit, and save dil that can b useful for oc bail out and other uses.
did u use a fixed MP reg or a normal reg to feed the "blower ?
regards
jean mi

I simply tapped into the existing Inspiration diluent manifold, so it was using the normal first stage gas provided by the onboard regulator.

Not that it really makes a huge difference, but the system I built used the standard modified wings inflator for adding gas, and I retained the quick connect. Theoretically, any gas could be plugged in there, and as it's a completely redundant gas addition pathway, could be used as a substitute manual add valve if the main rig manual add valve failed. Either diluent or 02 could be fed to that port.

Dave

18th November 2007, 20:04	#1 (permalink)
jmurba wet bear Current Rebreather/s: Home Build Other Rebreather/s: Home Build Join Date: May 2006 Location: cannes france Posts: 659	blowing the sensor with diluant Hi all I read on the web that some divers are blowing diluant on the sensors in order to get rid of the vapor/films and to check the sensors. : Inspration Modification Has anybody tried that here down ? Does it works ? isnt' it harmfull for the sensors ? regards jean mi __________________ when will I be able to think about something else then spending hours underwater, when will I be normal ? http://web.mac.com/jmurba/Site_2/home.html http://web.mac.com/jmurba/Site_3/home.html
(Online)

18th November 2007, 21:44	#2 (permalink)
ardhill New Member Current Rebreather/s: Not Bought Yet Other Rebreather/s: Not Bought Yet Join Date: Feb 2007 Location: Belfast, Northern Ireland Posts: 46	Re: blowing the sensor with diluant Hi Isn't this what the Pelagian does? Oxygen sensor validation - Pelagian DCCCR closed circuit rebreather Maybe ask on that part of the forum, you may get some helpful information? __________________ Paul (Note: I currently don't dive a Rebreather, but dive OC. So if anything I say about breathers sounds suspect - it probably is)
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18th November 2007, 21:49	#3 (permalink)
Mark Chase I go down for ages Current Rebreather/s: Classic Kiss Other CCR Other Rebreather/s: Inspiration Classic Other CCR Join Date: Jan 2005 Location: Kent Posts: 2,410	Re: blowing the sensor with diluant Quote: (Originally Posted by jmurba) Hi all I read on the web that some divers are blowing diluant on the sensors in order to get rid of the vapor/films and to check the sensors. : Inspration Modification Has anybody tried that here down ? Does it works ? isnt' it harmful for the sensors ? regards jean mi Its an old mod they did to blow water off the face off the cells and get a better cell reaction reading. Then AP started putting hydrophobic membranes on the cell faces and it kind of lost favor. There was also some concern about the jet of air blasting the water through the cell membrane. I haven't read about anyone doing it recently ATB Mark __________________ Is it supposed to make that noise ? I took my unit to the dive shop and demanded they bolt on every thing that would fit. Join my elite diving teem and get a Tshirt "Doing It Chasey"Hammerhead Eccr Advanced Diving System
(Online)

18th November 2007, 22:42	#4 (permalink)
Dave Sutton Living on Animal Farm Current Rebreather/s: Sport Kiss MK 15.X rEvo Other CCR Azimuth Home Build Other Rebreather/s: Classic Kiss rEvo Other CCR Azimuth Home Build Join Date: Jun 2006 Location: Narragansett, Rhode Island and Hackettstown, New Jersey Posts: 2,450	Re: blowing the sensor with diluant Being the one who did what was cited in the article by the first poster: This was first done on the CIS's to allow the diver to verify the sensor dynamics. It's a good thing to be able to do. I did the one that the article was written about at the request of Chris Gregory for his Inspiration during a period in which Inspiration divers were dropping like flies. The one I did for him worked great, and had only sufficient volume to gently "puff" the sensor. Anyone who was "concerned" about damage to the sensors never saw the system. This is still a very valid safety tool, and ought to be studied. Dave __________________ . "All animals are equal, but some animals are more equal than others" Professional Small Boy: Never Successfully Cubicled.
(Offline)

19th November 2007, 07:09	#5 (permalink)
ChristianM New Member Current Rebreather/s: Dolphin Home Build Other Rebreather/s: Dolphin Home Build Join Date: Sep 2005 Location: Germany Posts: 44	Re: blowing the sensor with diluant Also the new Poseidon MKVI is doing this to ensure a dry sensor and to validate the readings. Cheers! Christian
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19th November 2007, 08:42	#6 (permalink)
jmurba wet bear Current Rebreather/s: Home Build Other Rebreather/s: Home Build Join Date: May 2006 Location: cannes france Posts: 659	Re: blowing the sensor with diluant Mark dave and others Thanks for info, I wonder if the gas blown is actually drying the sensor face or moving the vapor/film away ? how hard is the gas "jet" ? regards jean mi __________________ when will I be able to think about something else then spending hours underwater, when will I be normal ? http://web.mac.com/jmurba/Site_2/home.html http://web.mac.com/jmurba/Site_3/home.html
(Online)

19th November 2007, 13:13	#7 (permalink)
jmurba wet bear Current Rebreather/s: Home Build Other Rebreather/s: Home Build Join Date: May 2006 Location: cannes france Posts: 659	Re: blowing the sensor with diluant Quote: (Originally Posted by ardhill) Hi Isn't this what the Pelagian does? Oxygen sensor validation - Pelagian DCCCR closed circuit rebreather Maybe ask on that part of the forum, you may get some helpful information? it would be great if a pelagian rebreather diver could tell us if it works good and if these injections are not bad for the sensors. __________________ when will I be able to think about something else then spending hours underwater, when will I be normal ? http://web.mac.com/jmurba/Site_2/home.html http://web.mac.com/jmurba/Site_3/home.html
(Online)

19th November 2007, 15:12	#8 (permalink)
Dave Sutton Living on Animal Farm Current Rebreather/s: Sport Kiss MK 15.X rEvo Other CCR Azimuth Home Build Other Rebreather/s: Classic Kiss rEvo Other CCR Azimuth Home Build Join Date: Jun 2006 Location: Narragansett, Rhode Island and Hackettstown, New Jersey Posts: 2,450	Re: blowing the sensor with diluant Quote: (Originally Posted by jmurba) Mark dave and others Thanks for info, I wonder if the gas blown is actually drying the sensor face or moving the vapor/film away ? how hard is the gas "jet" ? regards jean mi It's doing both... drying and validating. The velocity was low and the flow was low... I never measured it, but maximim perhaps 4 litres per minute? It's the velocity that is the issue for a sensor, and that was fairly low due to the rather large orifices in the nozzle at the sensor faces. In addition, the nozzle was about 2.5 CM from the sensors. There is zero doubt that this system works. That's not suject to debate. It does not harm the sensors. Is it needed? That's the only question. Dave __________________ . "All animals are equal, but some animals are more equal than others" Professional Small Boy: Never Successfully Cubicled.
(Offline)

19th November 2007, 18:51	#9 (permalink)
jmurba wet bear Current Rebreather/s: Home Build Other Rebreather/s: Home Build Join Date: May 2006 Location: cannes france Posts: 659	Re: blowing the sensor with diluant Quote: (Originally Posted by Dave Sutton) It's doing both... drying and validating. The velocity was low and the flow was low... I never measured it, but maximim perhaps 4 litres per minute? It's the velocity that is the issue for a sensor, and that was fairly low due to the rather large orifices in the nozzle at the sensor faces. In addition, the nozzle was about 2.5 CM from the sensors. There is zero doubt that this system works. That's not suject to debate. It does not harm the sensors. Is it needed? That's the only question. Dave Hi dave if there is zero doubt then sûre it is needed, it replaces a big flush of the circuit, and save dil that can b useful for oc bail out and other uses. did u use a fixed MP reg or a normal reg to feed the "blower ? regards jean mi __________________ when will I be able to think about something else then spending hours underwater, when will I be normal ? http://web.mac.com/jmurba/Site_2/home.html http://web.mac.com/jmurba/Site_3/home.html
(Online)

19th November 2007, 20:56	#10 (permalink)
Dave Sutton Living on Animal Farm Current Rebreather/s: Sport Kiss MK 15.X rEvo Other CCR Azimuth Home Build Other Rebreather/s: Classic Kiss rEvo Other CCR Azimuth Home Build Join Date: Jun 2006 Location: Narragansett, Rhode Island and Hackettstown, New Jersey Posts: 2,450	Re: blowing the sensor with diluant Quote: (Originally Posted by jmurba) Hi dave if there is zero doubt then sûre it is needed, it replaces a big flush of the circuit, and save dil that can b useful for oc bail out and other uses. did u use a fixed MP reg or a normal reg to feed the "blower ? regards jean mi I simply tapped into the existing Inspiration diluent manifold, so it was using the normal first stage gas provided by the onboard regulator. Not that it really makes a huge difference, but the system I built used the standard modified wings inflator for adding gas, and I retained the quick connect. Theoretically, any gas could be plugged in there, and as it's a completely redundant gas addition pathway, could be used as a substitute manual add valve if the main rig manual add valve failed. Either diluent or 02 could be fed to that port. Dave __________________ . "All animals are equal, but some animals are more equal than others" Professional Small Boy: Never Successfully Cubicled.
(Offline)

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