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tamorgen · 28th April 2008, 14:30

Quote: (Originally Posted by Dinspiration)

Hi

I don't know what you mean with OC option. To use the VR3 with a SCR you will need to switch the VR3 into OC mode.

SCR calibration with VR3:

- Switch the VR3 via Gas Menu into the OC Mode
- Set XFunc to XO2
- Select O2
- Press both buttons to enter calibration mode
- Make sure, that the O2 Cell is in ambient air
- It will ask: Flush Cal Gas - in ambient air you can skip it
- After that it will display: Equalize - in ambient air you can skip it
- Next is: Stable reading. If you have an stable reading press both buttons short to calibrate the VR3 in air. AFTER the calibration the VR3 will display 21.0 % O2 in AIR correctly. Before the calibration it will display whatever is stored in the memory from the last calibration. It can be, that it will display something completly wrong. BUT as soon as you did the calibration it should update the Display with the correct values = 21.0 %.

That's all, what you have to do. This is exaclty how the calibration is done with the actual firmware 2007v.

DINspiration

By open circuit option, I mean calibrating the unit as per the open circuit directions on pages 50 & 51 of the manual. Those directions do not say anything about "FLUSH" and "EQUALISE", so I'm a bit perplexed. The method I wrote about above, appears to be the CCR method, which is on pages 52 & 53. It specifically says "Special Procedure for Closed Circuit VR3s". The more I think about it, I think this may be the way I have to do it. I think I have to put it into Closed Circuit to do the calibration, and set a calibration gas. I'm not using it for CCR, but I do have the CCR pin.

I did try the method you wrote (method for CCR VR3s), as I had already said, however it did not give me 21%. The method says "make sure you are in Closed Circuit mode and you see CLOSED CCT at the top of the screen"

After attempting to calibrate off of ambient air, it gave me 32% in air, 50% with my 37% mix (yes, I set me mix when I went to dive it). I don't have the 2007v firmware (I have V3.03aC). So, what could I possibly be doing wrong?

28th April 2008, 14:30	#8 (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 Dinspiration) Hi I don't know what you mean with OC option. To use the VR3 with a SCR you will need to switch the VR3 into OC mode. SCR calibration with VR3: - Switch the VR3 via Gas Menu into the OC Mode - Set XFunc to XO2 - Select O2 - Press both buttons to enter calibration mode - Make sure, that the O2 Cell is in ambient air - It will ask: Flush Cal Gas - in ambient air you can skip it - After that it will display: Equalize - in ambient air you can skip it - Next is: Stable reading. If you have an stable reading press both buttons short to calibrate the VR3 in air. AFTER the calibration the VR3 will display 21.0 % O2 in AIR correctly. Before the calibration it will display whatever is stored in the memory from the last calibration. It can be, that it will display something completly wrong. BUT as soon as you did the calibration it should update the Display with the correct values = 21.0 %. That's all, what you have to do. This is exaclty how the calibration is done with the actual firmware 2007v. DINspiration By open circuit option, I mean calibrating the unit as per the open circuit directions on pages 50 & 51 of the manual. Those directions do not say anything about "FLUSH" and "EQUALISE", so I'm a bit perplexed. The method I wrote about above, appears to be the CCR method, which is on pages 52 & 53. It specifically says "Special Procedure for Closed Circuit VR3s". The more I think about it, I think this may be the way I have to do it. I think I have to put it into Closed Circuit to do the calibration, and set a calibration gas. I'm not using it for CCR, but I do have the CCR pin. I did try the method you wrote (method for CCR VR3s), as I had already said, however it did not give me 21%. The method says "make sure you are in Closed Circuit mode and you see CLOSED CCT at the top of the screen" After attempting to calibrate off of ambient air, it gave me 32% in air, 50% with my 37% mix (yes, I set me mix when I went to dive it). I don't have the 2007v firmware (I have V3.03aC). So, what could I possibly be doing wrong? Last edited by tamorgen : 28th April 2008 at 14:59.
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