Dive Rite cells on other CCR

OxyCheq · 15th July 2007, 13:02

Quote: (Originally Posted by wedivebc)

Patrick, you may or may not be aware that the sensors in a meg form the barrier between the unscrubbed and scrubbed gas. The back of the sensors are exposed to unscrubbed gas and a leak through the sensors can cause a scrubber bypass. A positive and negative pressure check is part of a meg predive to check the integrity of the sensor carrier (and sensors)
I spoke with a tech at teledyne and he said you could not generate enough pressure with your lungs to damage a sensor so the test should not harm sensors.

Dave,

All Galvanic sensors (not just Teledyne) that I know of are made the exact same way I mentioned previously and they have been made like that for quite some time.

Not even sure putting epoxy in the inside of the shell to hold the sub assembly would always ensure the desired results. As I said, tape is the only thing stopping any gas blowing by it.

If you ever have an old sensor, use a wooden dowel to pop it out and you will be able to see how they are constructed. If anyone is interested, I can post some photos.

Typically, when you design a product, you build around the other products you are going to use in it. It is just like designing the electronics around the output limitations or range of the sensor.

Not sure why the Meg is designed like that, I am sure Leon had his reasons.

Will call one of the engineers at Teledyne next week and verify the pressure.

Best regards,

Patrick
OxyCheq
http://oxycheq.com

**wedivebc** · 15th July 2007, 23:11

Quote: (Originally Posted by OxyCheq)

Dave,

All Galvanic sensors (not just Teledyne) that I know of are made the exact same way I mentioned previously and they have been made like that for quite some time.

Not even sure putting epoxy in the inside of the shell to hold the sub assembly would always ensure the desired results. As I said, tape is the only thing stopping any gas blowing by it.

If you ever have an old sensor, use a wooden dowel to pop it out and you will be able to see how they are constructed. If anyone is interested, I can post some photos.

Typically, when you design a product, you build around the other products you are going to use in it. It is just like designing the electronics around the output limitations or range of the sensor.

Not sure why the Meg is designed like that, I am sure Leoon had his reasons.

Will call one of the engineers at Teledyne next week and verify the pressure.

Best regards,

Patrick
OxyCheq
http://oxycheq.com

I was concerned about the pressure difference when doing pos / neg test on sensor carriage. That prompted me to call teledyne. I am not sure I was able to explain why we subjected these sensors to this test in a way the engineer could understand so if you get a different reply from teledyne please let us know.

15th July 2007, 13:02	#11 (permalink)
OxyCheq New Member Current Rebreather/s: Inspiration Classic Sport Kiss MK 15.X Other CCR Dolphin Other Rebreather/s: Other CCR Dolphin Join Date: Jan 2006 Location: Marianna FL USA Posts: 17	Re: Dive Rite cells on other CCR Quote: (Originally Posted by wedivebc) Patrick, you may or may not be aware that the sensors in a meg form the barrier between the unscrubbed and scrubbed gas. The back of the sensors are exposed to unscrubbed gas and a leak through the sensors can cause a scrubber bypass. A positive and negative pressure check is part of a meg predive to check the integrity of the sensor carrier (and sensors) I spoke with a tech at teledyne and he said you could not generate enough pressure with your lungs to damage a sensor so the test should not harm sensors. Dave, All Galvanic sensors (not just Teledyne) that I know of are made the exact same way I mentioned previously and they have been made like that for quite some time. Not even sure putting epoxy in the inside of the shell to hold the sub assembly would always ensure the desired results. As I said, tape is the only thing stopping any gas blowing by it. If you ever have an old sensor, use a wooden dowel to pop it out and you will be able to see how they are constructed. If anyone is interested, I can post some photos. Typically, when you design a product, you build around the other products you are going to use in it. It is just like designing the electronics around the output limitations or range of the sensor. Not sure why the Meg is designed like that, I am sure Leon had his reasons. Will call one of the engineers at Teledyne next week and verify the pressure. Best regards, Patrick OxyCheq http://oxycheq.com __________________ OxyCheq ... the diver's source for analytical instruments, wings and other tech diving equipment "Just because someone takes a dump once a day does not qualify them as a proctologist." P. Duffy Last edited by OxyCheq : 16th July 2007 at 00:04.
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15th July 2007, 23:11	#12 (permalink)
wedivebc Dave Tomblin 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: 1,444	Re: Dive Rite cells on other CCR Quote: (Originally Posted by OxyCheq) Dave, All Galvanic sensors (not just Teledyne) that I know of are made the exact same way I mentioned previously and they have been made like that for quite some time. Not even sure putting epoxy in the inside of the shell to hold the sub assembly would always ensure the desired results. As I said, tape is the only thing stopping any gas blowing by it. If you ever have an old sensor, use a wooden dowel to pop it out and you will be able to see how they are constructed. If anyone is interested, I can post some photos. Typically, when you design a product, you build around the other products you are going to use in it. It is just like designing the electronics around the output limitations or range of the sensor. Not sure why the Meg is designed like that, I am sure Leoon had his reasons. Will call one of the engineers at Teledyne next week and verify the pressure. Best regards, Patrick OxyCheq http://oxycheq.com I was concerned about the pressure difference when doing pos / neg test on sensor carriage. That prompted me to call teledyne. I am not sure I was able to explain why we subjected these sensors to this test in a way the engineer could understand so if you get a different reply from teledyne please let us know. __________________ Cheers, Dave.... Man is the only animal burdened with the knowledge he will eventually die
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