Analytical vs Teledyne O2 sensors for VR3

Henry · 28th May 2005, 08:25

I am not sure if this has been address in the past. If so, please forgive the repost otherswise I hope this information will save someone else a lot of wasted time.

I own a sport KISS (#53)and dive a VR3. Jetsam normally uses Teledyne O2 sensors in their units but the latest batch came with Analytical sensors instead. The story is that there was a screw up at Teledyne, so Jetsam sent their specs to Analytical and had new sensors built.

When I first dove the unit, there was no problems at all. Recently I enable the VR3 onboard O2 reading function and I couldn't get a reading. My dive screen said XPP 0.000 and the calabration screen read 0.00% as well.

I swapped the 3 Analytical sensors back and forth to make sure I didn't have a faulty sensor and that didn't help. Then I took the whole thing to Jetsam to troubleshoot the cable to make all the wiring was ok and that wasn't it either.

I then phoned Delpta P thinking maybe I didn't know how to use the VR3. That wasn't it either. I was doing everything fine. The Delta P people then pointed out that they had some compatability issues with an Analytical sensor once and they couldn't get a reading off it.

So I went back to Jetsam and found a Teledyne O2 sensor. Tossed it in and VOILA! It works!

So that was one called dive, two drives out to Jetsam (thank god I live in the same city), one 1-hour long distance call to U.k. and a lot of late night head scratching while staring at my VR3.

The only difference I could see was the 1.5mV diffence in the sensor output on the low end while they both topped out at 13mV. The specs for each sensor can be found here:

http://www.aii1.com/
http://www.vandagraph.co.uk/

So if anyone else is having problems getting a reading from their VR3 while using an Analytical sensor. This might help.

Thanks
Henry

Scuba_Vixen · 28th May 2005, 13:48

It may have something to do with the internal resistance of the VR3 input circuit. Some sensors work properly into a 10k ohm load. The VR3 may be a much higher (200,000 ohm or so) impedance.

Try putting a 10k resistor across the cell output and see if it becomes VR3 friendly.

Darlene

***jradomski*** · 28th May 2005, 23:42

Quote: (Originally Posted by Henry)

I am not sure if this has been address in the past. If so, please forgive the repost otherswise I hope this information will save someone else a lot of wasted time.

I own a sport KISS (#53)and dive a VR3. Jetsam normally uses Teledyne O2 sensors in their units but the latest batch came with Analytical sensors instead. The story is that there was a screw up at Teledyne, so Jetsam sent their specs to Analytical and had new sensors built.

When I first dove the unit, there was no problems at all. Recently I enable the VR3 onboard O2 reading function and I couldn't get a reading. My dive screen said XPP 0.000 and the calabration screen read 0.00% as well.

I swapped the 3 Analytical sensors back and forth to make sure I didn't have a faulty sensor and that didn't help. Then I took the whole thing to Jetsam to troubleshoot the cable to make all the wiring was ok and that wasn't it either.

I then phoned Delpta P thinking maybe I didn't know how to use the VR3. That wasn't it either. I was doing everything fine. The Delta P people then pointed out that they had some compatability issues with an Analytical sensor once and they couldn't get a reading off it.

So I went back to Jetsam and found a Teledyne O2 sensor. Tossed it in and VOILA! It works!

So that was one called dive, two drives out to Jetsam (thank god I live in the same city), one 1-hour long distance call to U.k. and a lot of late night head scratching while staring at my VR3.

The only difference I could see was the 1.5mV diffence in the sensor output on the low end while they both topped out at 13mV. The specs for each sensor can be found here:

http://www.aii1.com/
http://www.vandagraph.co.uk/

So if anyone else is having problems getting a reading from their VR3 while using an Analytical sensor. This might help.

Thanks
Henry

I has a long email discussion with AI (I dont remember the gentlemans name) a while ago, he disagreed with my findings (shorter life than AI and were much more likely to go non linear at higher levels).. I explained my method and I was told he would do his own testing and see how valid my complaints were... After that he never emailed me again.. I guess he verified my findings since he was positive I was originally wrong..

The AI sensors seem to stay ok up to around 1.0 but really start slacking off at the upper end... at one point I had an older teledyne cell reading 1.6 whie the AI cell barely registered 1.3..

While they are new they seem to perform acceptlably..

28th May 2005, 08:25	#1 (permalink)
Henry New Member Current Rebreather/s: Sport Kiss Other Rebreather/s: Join Date: May 2005 Location: Vancouver, BC Canada Posts: 11	Analytical vs Teledyne O2 sensors for VR3 I am not sure if this has been address in the past. If so, please forgive the repost otherswise I hope this information will save someone else a lot of wasted time. I own a sport KISS (#53)and dive a VR3. Jetsam normally uses Teledyne O2 sensors in their units but the latest batch came with Analytical sensors instead. The story is that there was a screw up at Teledyne, so Jetsam sent their specs to Analytical and had new sensors built. When I first dove the unit, there was no problems at all. Recently I enable the VR3 onboard O2 reading function and I couldn't get a reading. My dive screen said XPP 0.000 and the calabration screen read 0.00% as well. I swapped the 3 Analytical sensors back and forth to make sure I didn't have a faulty sensor and that didn't help. Then I took the whole thing to Jetsam to troubleshoot the cable to make all the wiring was ok and that wasn't it either. I then phoned Delpta P thinking maybe I didn't know how to use the VR3. That wasn't it either. I was doing everything fine. The Delta P people then pointed out that they had some compatability issues with an Analytical sensor once and they couldn't get a reading off it. So I went back to Jetsam and found a Teledyne O2 sensor. Tossed it in and VOILA! It works! So that was one called dive, two drives out to Jetsam (thank god I live in the same city), one 1-hour long distance call to U.k. and a lot of late night head scratching while staring at my VR3. The only difference I could see was the 1.5mV diffence in the sensor output on the low end while they both topped out at 13mV. The specs for each sensor can be found here: http://www.aii1.com/ http://www.vandagraph.co.uk/ So if anyone else is having problems getting a reading from their VR3 while using an Analytical sensor. This might help. Thanks Henry
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28th May 2005, 13:48	#2 (permalink)
Scuba_Vixen e/mCCR Dolphin Pilot Current Rebreather/s: Other CCR Home Build Other Rebreather/s: Other CCR Home Build Join Date: May 2005 Location: St. Croix USVI Posts: 557	It may have something to do with the internal resistance of the VR3 input circuit. Some sensors work properly into a 10k ohm load. The VR3 may be a much higher (200,000 ohm or so) impedance. Try putting a 10k resistor across the cell output and see if it becomes VR3 friendly. Darlene
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28th May 2005, 23:42	#3 (permalink)
*jradomski* Moderator Current Rebreather/s: Inspiration Classic Sport Kiss Optima rEvo Other CCR Home Build Other Rebreather/s: Inspiration Vision Evolution Megalodon Classic Kiss rEvo Other CCR Home Build Join Date: Mar 2005 Location: "Da" Bronx Posts: 2,849	Quote: (Originally Posted by Henry) I am not sure if this has been address in the past. If so, please forgive the repost otherswise I hope this information will save someone else a lot of wasted time. I own a sport KISS (#53)and dive a VR3. Jetsam normally uses Teledyne O2 sensors in their units but the latest batch came with Analytical sensors instead. The story is that there was a screw up at Teledyne, so Jetsam sent their specs to Analytical and had new sensors built. When I first dove the unit, there was no problems at all. Recently I enable the VR3 onboard O2 reading function and I couldn't get a reading. My dive screen said XPP 0.000 and the calabration screen read 0.00% as well. I swapped the 3 Analytical sensors back and forth to make sure I didn't have a faulty sensor and that didn't help. Then I took the whole thing to Jetsam to troubleshoot the cable to make all the wiring was ok and that wasn't it either. I then phoned Delpta P thinking maybe I didn't know how to use the VR3. That wasn't it either. I was doing everything fine. The Delta P people then pointed out that they had some compatability issues with an Analytical sensor once and they couldn't get a reading off it. So I went back to Jetsam and found a Teledyne O2 sensor. Tossed it in and VOILA! It works! So that was one called dive, two drives out to Jetsam (thank god I live in the same city), one 1-hour long distance call to U.k. and a lot of late night head scratching while staring at my VR3. The only difference I could see was the 1.5mV diffence in the sensor output on the low end while they both topped out at 13mV. The specs for each sensor can be found here: http://www.aii1.com/ http://www.vandagraph.co.uk/ So if anyone else is having problems getting a reading from their VR3 while using an Analytical sensor. This might help. Thanks Henry I has a long email discussion with AI (I dont remember the gentlemans name) a while ago, he disagreed with my findings (shorter life than AI and were much more likely to go non linear at higher levels).. I explained my method and I was told he would do his own testing and see how valid my complaints were... After that he never emailed me again.. I guess he verified my findings since he was positive I was originally wrong.. The AI sensors seem to stay ok up to around 1.0 but really start slacking off at the upper end... at one point I had an older teledyne cell reading 1.6 whie the AI cell barely registered 1.3.. While they are new they seem to perform acceptlably.. __________________ 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.
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