How to wire VR3 into one of three original unit sensors?

Drmike · 28th August 2007, 02:36

I want to wire my VR3 into one of the original 3 sensors on my homebuild.

The 3 cells are wired into a Hammerhead secondary with HUD (which works great BTW)

What I want to do it to T into one of the cells so it can also feed a VR3 to give me real time deco and independant ppo2 display.

I guess its a case of wiring in some resistors?

Can anyone advise where they go (I presume one in each wire coming off the original cell wires to the vr3?_) and what size resistors to use?

Cheers
Mike

jhaaja · 28th August 2007, 05:22

I don´t know why you would need any resistors. I think VR3 has a proper load on the computer side for the cell to work... Maybe...

JH

Stephane · 28th August 2007, 06:09

Hello Mike,

The cell that you will use for both HH and VR3 will see two resistor loads in parallel. I guess it will work OK but manufacturer specifications will change a little bit. Ask Teledyne (or AI) if those changes will be important.
Otherwise, just wire the VR3 on the Molex (or jack) connector of the cell.

Drmike · 28th August 2007, 09:12

thanks for the replys so far . I thought Id need some resistors in there so as to isolate the effect of one monitor going down from effecting the other - but now I thinka bout it that shouldnt be a prob as its not eccr and the other 2 cells are independant.

so, can I just T into the original sensor wires? Nothing else needed?

Dave Sutton · 28th August 2007, 09:15

Quote: (Originally Posted by Drmike)

thanks for the replys so far . I thought Id need some resistors in there so as to isolate the effect of one monitor going down from effecting the other - but now I thinka bout it that shouldnt be a prob as its not eccr and the other 2 cells are independant.

so, can I just T into the original sensor wires? Nothing else needed?

Works so far here on a rEvodream and VR-3 combo.... so try it.

Dave

jhaaja · 28th August 2007, 09:16

Quote: (Originally Posted by Drmike)

thanks for the replys so far . I thought Id need some resistors in there so as to isolate the effect of one monitor going down from effecting the other - but now I thinka bout it that shouldnt be a prob as its not eccr and the other 2 cells are independant.

so, can I just T into the original sensor wires? Nothing else needed?

Should work simply by making a parallel connection. There isn´t really any wasy way to isolate those ppO2 meters if they share a cell.

JH

PeteS · 28th August 2007, 21:15

I'd use a couple of Op-Amps as buffers.

28th August 2007, 02:36	#1 (permalink)
Drmike Custom Title Allowed! Current Rebreather/s: MK 15.X Ouroboros Other CCR Home Build Other Rebreather/s: Inspiration Classic Other CCR Home Build Join Date: Feb 2005 Posts: 3,157	How to wire VR3 into one of three original unit sensors? I want to wire my VR3 into one of the original 3 sensors on my homebuild. The 3 cells are wired into a Hammerhead secondary with HUD (which works great BTW) What I want to do it to T into one of the cells so it can also feed a VR3 to give me real time deco and independant ppo2 display. I guess its a case of wiring in some resistors? Can anyone advise where they go (I presume one in each wire coming off the original cell wires to the vr3?_) and what size resistors to use? Cheers Mike __________________ Cave diving is a sport Wreck diving is a sport Diving in general is a sport 'Rebreather diving' is not a sport its the delusional obsession with a highly dangerous and often inappropriate piece of equipment
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28th August 2007, 05:22	#2 (permalink)
jhaaja Custom Title Allowed! Current Rebreather/s: Inspiration Classic Other Rebreather/s: Join Date: Mar 2005 Location: Finland Posts: 884	Re: How to wire VR3 into one of three original unit sensors? I don´t know why you would need any resistors. I think VR3 has a proper load on the computer side for the cell to work... Maybe... JH
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28th August 2007, 06:09	#3 (permalink)
Stephane Hey! Ho! Let's go! Current Rebreather/s: rEvo Other Rebreather/s: rEvo Join Date: Nov 2005 Location: Nantes - France Posts: 742	Re: How to wire VR3 into one of three original unit sensors? Hello Mike, The cell that you will use for both HH and VR3 will see two resistor loads in parallel. I guess it will work OK but manufacturer specifications will change a little bit. Ask Teledyne (or AI) if those changes will be important. Otherwise, just wire the VR3 on the Molex (or jack) connector of the cell. __________________ Stéphane Hammer-rEvo powered!
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28th August 2007, 09:12	#4 (permalink)
Drmike Custom Title Allowed! Current Rebreather/s: MK 15.X Ouroboros Other CCR Home Build Other Rebreather/s: Inspiration Classic Other CCR Home Build Join Date: Feb 2005 Posts: 3,157	Re: How to wire VR3 into one of three original unit sensors? thanks for the replys so far . I thought Id need some resistors in there so as to isolate the effect of one monitor going down from effecting the other - but now I thinka bout it that shouldnt be a prob as its not eccr and the other 2 cells are independant. so, can I just T into the original sensor wires? Nothing else needed? __________________ Cave diving is a sport Wreck diving is a sport Diving in general is a sport 'Rebreather diving' is not a sport its the delusional obsession with a highly dangerous and often inappropriate piece of equipment
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28th August 2007, 09:15	#5 (permalink)
Dave Sutton Membership Cancelled Current Rebreather/s: Sport Kiss MK 15.X rEvo Other CCR Azimuth Home Build Other Rebreather/s: Classic Kiss rEvo Other CCR Azimuth Home Build Join Date: Jun 2006 Location: Narragansett, Rhode Island and Hackettstown, New Jersey Posts: 2,637	Re: How to wire VR3 into one of three original unit sensors? Quote: (Originally Posted by Drmike) thanks for the replys so far . I thought Id need some resistors in there so as to isolate the effect of one monitor going down from effecting the other - but now I thinka bout it that shouldnt be a prob as its not eccr and the other 2 cells are independant. so, can I just T into the original sensor wires? Nothing else needed? Works so far here on a rEvodream and VR-3 combo.... so try it. Dave
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28th August 2007, 09:16	#6 (permalink)
jhaaja Custom Title Allowed! Current Rebreather/s: Inspiration Classic Other Rebreather/s: Join Date: Mar 2005 Location: Finland Posts: 884	Re: How to wire VR3 into one of three original unit sensors? Quote: (Originally Posted by Drmike) thanks for the replys so far . I thought Id need some resistors in there so as to isolate the effect of one monitor going down from effecting the other - but now I thinka bout it that shouldnt be a prob as its not eccr and the other 2 cells are independant. so, can I just T into the original sensor wires? Nothing else needed? Should work simply by making a parallel connection. There isn´t really any wasy way to isolate those ppO2 meters if they share a cell. JH
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28th August 2007, 21:15	#7 (permalink)
PeteS Consent Issued! Current Rebreather/s: Inspiration Classic Inspiration Vision Other Rebreather/s: Join Date: Jun 2005 Location: New Zealand Posts: 515	Re: How to wire VR3 into one of three original unit sensors? I'd use a couple of Op-Amps as buffers. __________________ Pete S. http://www.steggle.co.nz Every silver lining has a cloud
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