Oxygen injection solenoid

divetheworld

We are working towards a truely 61508 compliant head, leaky valve would be key to this. So, the answer is yes. The problem is making a solution that John and I are happy with, most integrations seem to have some kind of compromise and as you know, we dont like doing that. even if it is expensive, it should be right.
I have tested this solenoid beyond its manufacturers spec and had no bypass at 11.1 bar above ambient, I have often run mine upto 9 for extended testing but there is no need as it flows 17ltr/min at 7.
NOTE:
This design of valve is held shut by the spring diaphram so excessive IP will open it. the right IP setting and first stage is part of the safety of the system and should not be overlooked.

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JonnyB

Which current rebreathers will it fit?

/Jonny

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A quote from Crazyduck - In remembering our own Rob Davies.
"Outbound flight 777 heavy you are cleared for flight
Due west into that warm red Texas sunset
You have angels on your wings and divers memories on your six."

Rest In Peace

http://www.divetekcyprus.com
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jradomski

what is the orifice size, its not listed...

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Joe Radomski
CCR Trimix Instructor Trainer
ANDI Instructor Trainer Director #10

All posts are personal opinions and DO NOT reflect any affiliated agency unless specifically stated.

iain-hsm

Brent.
Beautifully made and with a very professional clean clear and concise data sheet. This will do well, I guess 6000 ADP rebreathers times 2? LOL.

I have one small question, as I don’t understand you fully on the lubrication.
Although as I speed read, I first read it as “Do not lubricate (with) any other lubricant and not “Do not lubricate any other component.” You do say strongly use only Fomblin18.

On one hand the 0-rings you specified are fluorocarbon and I can see this for low temp flow and pressure drop performance (in a dynamic condition) etc. However you specify only Fomblin18 as the only lubricant allowed. Yet the rings are in static condition, Why?

With your fluorocarbon polymer choice I would have thought that the standard scuba Christo-lube MCG III would have been your preferred choice, also most divers and dive shops (I guess) use it. I’m just intrigued why Fomblin 18 and no other lubricant. iain

divetheworld

Iain,

A good point well put. We hope it does do well, but there will always be those who prefer to buy the cheap alternative because it has a factory sticker on it.
I really hadnt had time to look into any great detail at other lubricants. I will amend the manual to reflect your suggestion to read "or equivelant".
Many thanks for bringing this up.

Jonny,

We are loathed to quote any other until we have properly tested it in other units, but we will in time. Yes, the Meg is top of the list!!

Brent

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JonnyB

When you say in time, could you tell me an estimate

/Jonny

__________________
A quote from Crazyduck - In remembering our own Rob Davies.
"Outbound flight 777 heavy you are cleared for flight
Due west into that warm red Texas sunset
You have angels on your wings and divers memories on your six."

Rest In Peace

http://www.divetekcyprus.com
http://www.diveccr.com

divetheworld

Firstly, I would like to give my thanks to Joe Radomski for helping out with some vital information.

The Meg firing algorithm does not alow a duty cycle that will flow enough O2 through our solenoid to be safe. The off time is too great and our flow is lower than the Jaksa.
Other controllers such as ours, do not have such off times.

Short answer, it appears no to the Meg unless it has been fitted with another controller.


Brent

p.s. We're overwhelmed by the constructive feedback we are getting. Thanks everyone.

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jradomski

Brent,
You will need to have a meg diver figure out the max on times for the latest software (2.05/2.6) as this might have a high enough duty cycles..
The min time off can now be set at 4 seconds.. but I am not sure what the max on time is.. to get it to the recommended 12lpm you would need a pretty long on time (about 70% duty cycle), but with at least 4 seconds on, it will have a flow that can cover most ascents.. to get the 12lpm you need about 11 seconds on..

__________________
Joe Radomski
CCR Trimix Instructor Trainer
ANDI Instructor Trainer Director #10

All posts are personal opinions and DO NOT reflect any affiliated agency unless specifically stated.

UWSojourner

Sorry, my currency is not in "duty cycles". How long would the solenoid need to be on to get 12l of O2 added?

divetheworld

The solenoid flows 17ltrs/min @ 7bar. You need 12ltrs min for safety. without changing the IP to a highr pressure, you need to ensure that in one minute the solenoid can be opened for 41 secs when at max gain.
In English, if you are waaaaaaay off setpoint and the controller is trying its hardest to get back to setpoint, its on and off cycles must equate to being on for 41secs out of every minute.

Sooo, if a Meg pilot puts his head on a bench in air and sets a 1.3 setpoint he can time how long it is on for in a minute. If it equates to 41 secs or more then your in business.


Brent

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