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tamorgen · 28th April 2008, 18:14

Quote: (Originally Posted by sdussault)

I use the VR3 with my Dolphin. I must admit it took awhile to get everything working OK. First and foremost do you have NEW O2 cell? Having more than one cell is a good idea. My early problems were do to bad cells. When you calibrate with air the output of the cell should be between 9mV - 13mV. I typically see about 10mV. Make sure there is no corrosion / discoloration on the connector. If so clean the connections and try again. I just came back from a week long diving trip where the VR3 with Dolphin worked flawlessly.

Regards,

Steve

Hi Steve,
I just had bought 2 new sensors before diving this weekend. I had tried them both. As I discovered, the problem wasn't the sensors, it was getting it calibrated correctly. Since I bought the VR3 with the C4 code, I discovered today that you must calibrate it as if you are calibrating it in CCR mode, and set the calibration gas. If you only have the C1 or C2 code, you can calibrate it in OC mode, and it defaults to Air for the calibration gas. The problem is that the VR3 manual just isn't written very well, and it may say things, but only in shades of grey. You really have to read between the lines to figure this sort of thing out. Now that I know, I don't expect to have any further issues.

28th April 2008, 18:14	#15 (permalink)
tamorgen Gadget guru extrordinaire Current Rebreather/s: Dolphin Other Rebreather/s: Dolphin Join Date: Apr 2006 Location: Columbia, MD Posts: 183	Re: Calibrating the VR3 O2 Sensor Quote: (Originally Posted by sdussault) I use the VR3 with my Dolphin. I must admit it took awhile to get everything working OK. First and foremost do you have NEW O2 cell? Having more than one cell is a good idea. My early problems were do to bad cells. When you calibrate with air the output of the cell should be between 9mV - 13mV. I typically see about 10mV. Make sure there is no corrosion / discoloration on the connector. If so clean the connections and try again. I just came back from a week long diving trip where the VR3 with Dolphin worked flawlessly. Regards, Steve Hi Steve, I just had bought 2 new sensors before diving this weekend. I had tried them both. As I discovered, the problem wasn't the sensors, it was getting it calibrated correctly. Since I bought the VR3 with the C4 code, I discovered today that you must calibrate it as if you are calibrating it in CCR mode, and set the calibration gas. If you only have the C1 or C2 code, you can calibrate it in OC mode, and it defaults to Air for the calibration gas. The problem is that the VR3 manual just isn't written very well, and it may say things, but only in shades of grey. You really have to read between the lines to figure this sort of thing out. Now that I know, I don't expect to have any further issues.
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