VR3 Musings - Gas Blending -VR3 Possible use as Pressure Gauge ?

Deepthought_reloaded · 10th November 2006, 18:14

I know the VR3 has an option to do gas blending calculations BUT

I was looking at a blending hose with a transducer and a very nice but very expensive digital pressure gauge and a thought struck me;-

How about using a setup like the HP sender that the VR3 uses for tank contents and reading the pressure from the VR3

It would mean the blending hose wouldnt need its own seperate pressure gauge so one less thing required for excess baggage.

I know this is one of the cheaper PINs for the VR3 (the value is in the cable and transducer) but does anyone know what transducers are used by DeltaP and how it's wired ? Sometimes see pressure transducers on ebay going for way less than a suitable analoge bourdon gauge - could be an interesting winter project

Just a thought...

Hey maybe DP might want to make a commercial version and integrate the pressure sensor and the blending calculator...
If so, all donations gratefully received.

abowie · 10th November 2006, 19:18

Easier and a lot cheaper to just buy yourself an old air integrated computer like a Suunto Eon off Ebay.

Dutchy · 10th November 2006, 20:39

Pressure transducers are cheap. That is if you can afford to be 10 bar off the mark. For calculating SAC rates it's not a problem as long as the deviation is consistent but for blending? I'd like to know how precise it is before buying. The fact that it displays up to 1/10th of a Bar (resolution) doesn't mean it's precise to 10 Bar (accuracy)

Fort Collins Bob · 10th November 2006, 21:38

I heard that the vr3 was coming out w/ pressure transducer device.

Deepthought_reloaded · 11th November 2006, 03:27

Quote: (Originally Posted by Fort Collins Bob)

I heard that the vr3 was coming out w/ pressure transducer device.

They refer to it as C31 - fischer plug, wire and transducer which screws into HP port on the 1st stage... I was thinking about saving a little cash as for blending - no need for waterproof

I really like the idea but it looks like you cant use it at the same time as an O2 cell...

there was a coment about a little triangular metal box on the DP stand at NEC with three fischers in... or perhaps a second feature connector could be fitted?

I agree with dutchy about the accuracy issue - there's ways round it

***Beanie*** · 11th November 2006, 07:17

Quote: (Originally Posted by Deepthought_reloaded)

there was a coment about a little triangular metal box on the DP stand at NEC with three fischers in... or perhaps a second feature connector could be fitted?

Yep three ports into the VR£ one O2 and to HP although there is a rumor it could also support 3 O2 cells
see Stefan's NEC report for more info and a photo

10th November 2006, 18:14	#1 (permalink)
Deepthought_reloaded New Member Current Rebreather/s: Azimuth Other Rebreather/s: Azimuth Join Date: Oct 2006 Location: York Posts: 59	VR3 Musings - Gas Blending -VR3 Possible use as Pressure Gauge ? I know the VR3 has an option to do gas blending calculations BUT I was looking at a blending hose with a transducer and a very nice but very expensive digital pressure gauge and a thought struck me;- How about using a setup like the HP sender that the VR3 uses for tank contents and reading the pressure from the VR3 It would mean the blending hose wouldnt need its own seperate pressure gauge so one less thing required for excess baggage. I know this is one of the cheaper PINs for the VR3 (the value is in the cable and transducer) but does anyone know what transducers are used by DeltaP and how it's wired ? Sometimes see pressure transducers on ebay going for way less than a suitable analoge bourdon gauge - could be an interesting winter project Just a thought... Hey maybe DP might want to make a commercial version and integrate the pressure sensor and the blending calculator... If so, all donations gratefully received.
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10th November 2006, 19:18	#2 (permalink)
abowie Fighting Girl Current Rebreather/s: Sport Kiss Other Rebreather/s: Join Date: May 2005 Location: Land of Oz Posts: 574	Re: VR3 Musings - Gas Blending -VR3 Possible use as Pressure Gauge ? Easier and a lot cheaper to just buy yourself an old air integrated computer like a Suunto Eon off Ebay. __________________ Andrew Bowie Rebreather-friendly Buddy
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10th November 2006, 20:39	#3 (permalink)
Dutchy Rene Warries Current Rebreather/s: Sport Kiss Other Rebreather/s: Join Date: Apr 2006 Location: Nieuwegein (The Netherlands) Posts: 770	Re: VR3 Musings - Gas Blending -VR3 Possible use as Pressure Gauge ? Pressure transducers are cheap. That is if you can afford to be 10 bar off the mark. For calculating SAC rates it's not a problem as long as the deviation is consistent but for blending? I'd like to know how precise it is before buying. The fact that it displays up to 1/10th of a Bar (resolution) doesn't mean it's precise to 10 Bar (accuracy) __________________ = This post is environmentally friendly. It is composed of 100% recycled electrons only. =
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10th November 2006, 21:38	#4 (permalink)
Fort Collins Bob Always Learning. Current Rebreather/s: Ouroboros Other Rebreather/s: Join Date: Apr 2006 Location: Fort Collins Colorado Posts: 112	Re: VR3 Musings - Gas Blending -VR3 Possible use as Pressure Gauge ? I heard that the vr3 was coming out w/ pressure transducer device. __________________ Best Regards all ------------------------------------------- Bob Fridell Ouroboros #46 Fort Collins, Colorado
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11th November 2006, 03:27	#5 (permalink)
Deepthought_reloaded New Member Current Rebreather/s: Azimuth Other Rebreather/s: Azimuth Join Date: Oct 2006 Location: York Posts: 59	Re: VR3 Musings - Gas Blending -VR3 Possible use as Pressure Gauge ? Quote: (Originally Posted by Fort Collins Bob) I heard that the vr3 was coming out w/ pressure transducer device. They refer to it as C31 - fischer plug, wire and transducer which screws into HP port on the 1st stage... I was thinking about saving a little cash as for blending - no need for waterproof I really like the idea but it looks like you cant use it at the same time as an O2 cell... there was a coment about a little triangular metal box on the DP stand at NEC with three fischers in... or perhaps a second feature connector could be fitted? I agree with dutchy about the accuracy issue - there's ways round it
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11th November 2006, 07:17	#6 (permalink)
*Beanie* give a man an inch....... Current Rebreather/s: Inspiration Classic Other Rebreather/s: Inspiration Vision Join Date: Jan 2005 Location: In da house! yeah baby! Posts: 3,174	Re: VR3 Musings - Gas Blending -VR3 Possible use as Pressure Gauge ? Quote: (Originally Posted by Deepthought_reloaded) there was a coment about a little triangular metal box on the DP stand at NEC with three fischers in... or perhaps a second feature connector could be fitted? Yep three ports into the VR£ one O2 and to HP although there is a rumor it could also support 3 O2 cells see Stefan's NEC report for more info and a photo __________________ Beanie Gallery Admin & Library Assistant. www.outlawdivers.org.uk www.beandiving.co.uk www.beanengineering.co.uk
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