An O2 sensor pressure pot finally available

cedricverdier · 21st November 2006, 03:14

Hi all,

Thanks to this forum, almost all the rebreather divers are aware of the current-limited O2 sensors and how it could affect the pO2 reading.
Unfortunately some accidents in a recent past, show that it's definitely an issue, even with new sensors. Just changing sensors every 18 months is not enough and a friend of mine had some faulty cells fresh from their package.

People have been discussing since a while about how to test the sensors at an O2 pressure higher then 1.0 at the surface (preferably higher than 1.6). Most of the rebreather divers don't have access to a pressure pot (quite expensive). And even if they have, they don't pressure test their sensors on a regular basis.

I was glad to see at DEMA that Ron Micjian, one of the Rebreather World most active members, came up with a very nice portable (and affordable!) pressure pot to test 3 sensors at the same time. Sounds to me like a must!

It's small and light, and extremely easy to use. You connect it to an analyzer, increase the pressure. Voila! The analyzer is used as a display for the sensors.

Depending on how often you dive with your rebreather, testing the sensors should be part of a monthly routine. Sensors decay over time and their inability to read high pO2 should be the main reason to discard them. Age doesn't mean a lot.

Good job, Ron. Wearing a tuxedo at the Rebreather World party was already impressive. But designing this pressure pot is even better.

Keep on having some good ideas like that. It definitely improves safety for the rebreather divers. You'll maybe get a Rebreather World Award for that next year!

Cheers

**wedivebc** · 21st November 2006, 04:09

We have debated the merits of training/technique vs throwing equipment at a problem ad nauseum but my friend, a non rebreather diver put it best when looking at this problem from an outsiders point of view. "Why wouldn't you want to know if your sensors were current limited before you packed all your gear, hired a boat and dived to 20ft only to realize a sensor pooched" ?
Seems to me a bench tester for sensors make a lot of sense. I for one will be using Ron's sensor gizmo.

NickK · 21st November 2006, 05:03

Quote: (Originally Posted by wedivebc)

................ "Why wouldn't you want to know if your sensors were current limited before you packed all your gear, hired a boat and dived to 20ft only to realize a sensor pooched" ?
Seems to me a bench tester for sensors make a lot of sense. I for one will be using Ron's sensor gizmo.

Well said. 100% agree.

Nick

PacketSniffer · 21st November 2006, 13:40

Quote: (Originally Posted by wedivebc)

"Why wouldn't you want to know if your sensors were current limited before you packed all your gear, hired a boat and dived to 20ft only to realize a sensor pooched" ?

From all of the discussion, this is the conclusion I have come to as well. I'll be using a pressure pot to test cells before heading out on a trip. Then, I'll spike the cells, on every dive, at 20fsw with O2 to ensure they will go above my intended dive set point. Avoiding the pressure pot test could waste a lot of money. Avoiding the test at 20fsw could waste a life.

***schford*** · 21st November 2006, 15:06

you can see ron explaing the tester on video here

tflaris · 21st November 2006, 16:38

Does anyone have a link to where this POT can be purchased or pre-oredered?

Nicholas von Rosen · 21st November 2006, 17:01

Quote: (Originally Posted by tflaris)

Does anyone have a link to where this POT can be purchased or pre-oredered?

And a price ?

Nick

PacketSniffer · 21st November 2006, 17:07

Ron's pressure pot is not available yet. I *thought* he said it would be ready in a couple of months. Retail price is USD$375. This includes the pressure pot, gauge, a BC inflator hose adapter and O2 meter.

Ron's site is here: TMIShop

Edit1: It's not on the site yet (at least not when I was there last). But, I gave the link so you knew where to get it from.

Edit2: I just noticed on the flyer he states availability in January.

***schford*** · 21st November 2006, 17:07

I am sure Ron will be along shortly.....

RonMicjan · 23rd November 2006, 00:27

is it shortly yet?
Thanks for the kudos Cedric, ( i will be sending you that $5.00 soon : ) hehe

the introductory price is 375, however if a few of y'all would help me with first batch costs, I will sell the first 20 pre-orders for only $300, paypal me 300 to ron@tmishop.com. I can also take a visa or MC over the phone or via email. My machinist has stated that Jan 1st he will have 10 done, and then more materials will be coming in and a batch of 50 should be available in the middle of feb.(I am in mexico diving and training from 10jan to 3 feb, so wont get anything done then) The system will come with the pot, interconnect cable, flow restrictor, tubing, and an analyser with a remote sensor port.

thanks for the interest folks

21st November 2006, 03:14	#1 (permalink)
cedricverdier S21 M.I.B. Current Rebreather/s: Evolution Megalodon Other Rebreather/s: Not Bought Yet Inspiration Classic Inspiration Vision Sport Kiss Classic Kiss Join Date: Apr 2005 Location: Worldwide! Posts: 488	An O2 sensor pressure pot finally available Hi all, Thanks to this forum, almost all the rebreather divers are aware of the current-limited O2 sensors and how it could affect the pO2 reading. Unfortunately some accidents in a recent past, show that it's definitely an issue, even with new sensors. Just changing sensors every 18 months is not enough and a friend of mine had some faulty cells fresh from their package. People have been discussing since a while about how to test the sensors at an O2 pressure higher then 1.0 at the surface (preferably higher than 1.6). Most of the rebreather divers don't have access to a pressure pot (quite expensive). And even if they have, they don't pressure test their sensors on a regular basis. I was glad to see at DEMA that Ron Micjian, one of the Rebreather World most active members, came up with a very nice portable (and affordable!) pressure pot to test 3 sensors at the same time. Sounds to me like a must! It's small and light, and extremely easy to use. You connect it to an analyzer, increase the pressure. Voila! The analyzer is used as a display for the sensors. Depending on how often you dive with your rebreather, testing the sensors should be part of a monthly routine. Sensors decay over time and their inability to read high pO2 should be the main reason to discard them. Age doesn't mean a lot. Good job, Ron. Wearing a tuxedo at the Rebreather World party was already impressive. But designing this pressure pot is even better. Keep on having some good ideas like that. It definitely improves safety for the rebreather divers. You'll maybe get a Rebreather World Award for that next year! Cheers __________________ Cedric Verdier PADI Course Director, ANDI-IANTD-PSAI-TDI-DSAT-DAN-NAUI-CMAS Instructor Trainer Trimix (CCR and OC) and Cave Diving Instructor Trainer www.CedricVerdier.com DIRrebreather member
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21st November 2006, 04:09	#2 (permalink)
wedivebc FIGJAM Current Rebreather/s: Megalodon Other CCR Other Rebreather/s: Not Bought Yet Inspiration Classic Sport Kiss Other CCR Join Date: Feb 2005 Location: Vancouver Island BC Canada Posts: 1,358	Re: An O2 sensor pressure pot finally available We have debated the merits of training/technique vs throwing equipment at a problem ad nauseum but my friend, a non rebreather diver put it best when looking at this problem from an outsiders point of view. "Why wouldn't you want to know if your sensors were current limited before you packed all your gear, hired a boat and dived to 20ft only to realize a sensor pooched" ? Seems to me a bench tester for sensors make a lot of sense. I for one will be using Ron's sensor gizmo. __________________ Cheers, Dave.... Man is the only animal burdened with the knowledge he will eventually die
(Online)

21st November 2006, 05:03	#3 (permalink)
NickK New Member Current Rebreather/s: Evolution Other Rebreather/s: Join Date: Nov 2005 Posts: 83	Re: An O2 sensor pressure pot finally available Quote: (Originally Posted by wedivebc) ................ "Why wouldn't you want to know if your sensors were current limited before you packed all your gear, hired a boat and dived to 20ft only to realize a sensor pooched" ? Seems to me a bench tester for sensors make a lot of sense. I for one will be using Ron's sensor gizmo. Well said. 100% agree. Nick
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21st November 2006, 13:40	#4 (permalink)
PacketSniffer ~~~~~ #417 ~~~~~ Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Jun 2006 Location: Houston Posts: 414	Re: An O2 sensor pressure pot finally available Quote: (Originally Posted by wedivebc) "Why wouldn't you want to know if your sensors were current limited before you packed all your gear, hired a boat and dived to 20ft only to realize a sensor pooched" ? From all of the discussion, this is the conclusion I have come to as well. I'll be using a pressure pot to test cells before heading out on a trip. Then, I'll spike the cells, on every dive, at 20fsw with O2 to ensure they will go above my intended dive set point. Avoiding the pressure pot test could waste a lot of money. Avoiding the test at 20fsw could waste a life. __________________ Far better it is to dare mighty things, to win glorious triumphs, even though checked by failure, than to take rank with those poor spirits who neither enjoy much nor suffer much, because they live in the gray twilight that knows not victory or defeat.
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21st November 2006, 15:06	#5 (permalink)
*schford* Despotic Overlord Current Rebreather/s: Megalodon Sport Kiss Other Rebreather/s: Join Date: Jan 2005 Location: London, UK Posts: 3,662	Re: An O2 sensor pressure pot finally available you can see ron explaing the tester on video here __________________ Bailout and Kit Management account for Murphy's Law The only bad question is one you did not ask and later wish you had. Use of Rebreather World is subject to the Rebreather World Terms & Conditions of Use
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21st November 2006, 16:38	#6 (permalink)
tflaris Custom Title Allowed! Current Rebreather/s: Evolution Other Rebreather/s: Join Date: Oct 2006 Location: Neptune Beach, Florida Posts: 225	Re: An O2 sensor pressure pot finally available Does anyone have a link to where this POT can be purchased or pre-oredered? __________________ "Except for this one, I have come to the conclusion that all generalizations are false" -Jim Hayes
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21st November 2006, 17:01	#7 (permalink)
Nicholas von Rosen Custom Title Allowed! Current Rebreather/s: Inspiration Vision Other Rebreather/s: Inspiration Classic Join Date: Jul 2005 Location: Helsingoer, Denmark Posts: 152	Re: An O2 sensor pressure pot finally available Quote: (Originally Posted by tflaris) Does anyone have a link to where this POT can be purchased or pre-oredered? And a price ? Nick __________________ NICK
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21st November 2006, 17:07	#8 (permalink)
PacketSniffer ~~~~~ #417 ~~~~~ Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Jun 2006 Location: Houston Posts: 414	Re: An O2 sensor pressure pot finally available Ron's pressure pot is not available yet. I thought he said it would be ready in a couple of months. Retail price is USD$375. This includes the pressure pot, gauge, a BC inflator hose adapter and O2 meter. Ron's site is here: TMIShop Edit1: It's not on the site yet (at least not when I was there last). But, I gave the link so you knew where to get it from. Edit2: I just noticed on the flyer he states availability in January. __________________ Far better it is to dare mighty things, to win glorious triumphs, even though checked by failure, than to take rank with those poor spirits who neither enjoy much nor suffer much, because they live in the gray twilight that knows not victory or defeat. Last edited by PacketSniffer : 21st November 2006 at 17:12. Reason: Update with info.
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21st November 2006, 17:07	#9 (permalink)
*schford* Despotic Overlord Current Rebreather/s: Megalodon Sport Kiss Other Rebreather/s: Join Date: Jan 2005 Location: London, UK Posts: 3,662	Re: An O2 sensor pressure pot finally available I am sure Ron will be along shortly..... __________________ Bailout and Kit Management account for Murphy's Law The only bad question is one you did not ask and later wish you had. Use of Rebreather World is subject to the Rebreather World Terms & Conditions of Use
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23rd November 2006, 00:27	#10 (permalink)
RonMicjan Cap Ron scourge of the NW Current Rebreather/s: Megalodon Dolphin Home Build Other Rebreather/s: Sport Kiss Classic Kiss Dolphin Home Build Join Date: Feb 2005 Location: Cape Disapointment, The Graveyard of the Pacific Posts: 1,082	Re: An O2 sensor pressure pot finally available is it shortly yet? Thanks for the kudos Cedric, ( i will be sending you that $5.00 soon : ) hehe the introductory price is 375, however if a few of y'all would help me with first batch costs, I will sell the first 20 pre-orders for only $300, paypal me 300 to ron@tmishop.com. I can also take a visa or MC over the phone or via email. My machinist has stated that Jan 1st he will have 10 done, and then more materials will be coming in and a batch of 50 should be available in the middle of feb.(I am in mexico diving and training from 10jan to 3 feb, so wont get anything done then) The system will come with the pot, interconnect cable, flow restrictor, tubing, and an analyser with a remote sensor port. thanks for the interest folks __________________ Ron "Life is pain princess, anyone who tells you different, is selling something", The Dread Pirate Wesley. www.tmishop.com Diving bits etc.
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