VR3 PO2 problems please help

Rhino_Portland_Oregon

I have a VR3 hooked up to the 3rd sensor on my kiss sport. When I try to calibrate , it comes up with .253 for the PO2. I have read the manual several times and there has to be something that I am missing.

Can you manually put in the .209 for a calibration, or are you stuck with what the computer comes up with in a flush...

Please help with some step by step instructions.

Thanks !!

Abbo

I agree, the explanation in the manual is written in gobbledigook.
With my Meg, I calibrate the two Meg sensors at the same time. Then I use their estimate of the PO2 to input the DIL for calibrating the 4th cell to which the VR3 is attached. The primary and secondary Meg bricks tend to tell me the PO2 is around 0.97 when I am ready to calibrate the VR3: the trouble is that you are asked for ambient pressure, and doubtless a little air gets in when I open the loop to equalise. The good thing is that you can calibrate the VR3 cell with O2 or air or anything inbetween: the bad thing is that it has only a one point calibration.

Once you get the pig to work, you have 3 handsets to check for the whole of your dive. If the difference between the Meg sets and the VR3 gets too large (eg 1.4 versus 1.2) I switch the VR3 cell monitoring off by turning XDec off. Then, it assumes I am on the constant setpoint that I have programed in: I set that at 1.25 to allow for a margin for error when diving 1.3.
Clear as mud?
Oh, and don't forget to set the dil back to whatever dil you are diving with once you have finished the calibration.

tecdivertraining

Try This

Enter Calibration menu.

1.long hold both buttons to enter calibration.
2. it says flush bag, hit confirm.
3. stable reading hit confirm
4. your vr3 should now read 20.8 in ambient

All the above steps are don with the cell attached and just exposed to ambient air.

5.Then hold the cell against on O2 tank and your VR should reed 99 if the o2 is good.

6.fix it to your unit

7.Flush your unit 3 times and check handsets against Vr3

8. Spike it on descent to insure its not limited.

Hope that helps.

Matt

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Lancer4545

Hi,

I have just got a new cell for my VR3 analyzer as the one I had was quite old and still working although when trying to analyse 99.5% O2 it was coming up with a reading of around 109.8%.

I did what any one else would have done, went out, bought a new cell and came up with exactally the same readings.

I got onto Al at Delta P and told him of the problem and within a couple of hours I had the programming to fix it up.

The reason I am going through all this is it sounds as though you may have a similar problem. Like Matt said, calibrate the unit in air and then check it against a "KNOWN" percentage O2 and see what you come up with. If it's within 1.5% (which is what Delta P say is alright) you are good.

If not then there's your problem. You'll need to contact Delta P and they will get you going in no time.

I also strongly recommend this procedure to any one using the VR3 with a PO2 monitoring cell as there is no high point calibration so you are relying on the internal algorithym to calculate an accurate high point. If it's wrong and you're relying on you're in trouble!!

Regards,

Lance

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Mark Chase

Have you set the calibration gas to 99%?


GO to gas list turn off all gas except 99% and set it as the calibration gas. (see options at bottom of screen) Then calibrate again and see how you get on.

ATB

Mark Chase

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Dave Sutton

Uhh.....

Mark is right. You can set any gas as the cal gas. I use 99% (what the VR-3 uses to delineate pure 02) and calibrate in 02. The VR-3 reads dead-on in air after I do this.

You need to go to the gas menu, display 99% as the gas, and then select "cal gas" and it's set. That's a rough version, without the darned thing in my hand I cannot tell you the exact button pushes, but it's a piece of cake. Reading the manual is always advised...

Mark, you do not need to turn off all of the other gases, just set 99 as cal gas and calibrate away. You don't even need 99% selected as a usable gas when you calibrate, not only does it not need to be selected, it does not even need to be "on". Once it's set to "Cal gas" it's a done deal.



Dave

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