How to... dive a Shearwater Pursuit to +500m?

paulraymaekers · 4th October 2008, 17:05

Hi all

Had a 'thrilling' experience today at the rEvo test-center :-)

Purpose of the test today was to see what the real depth-limitation of the pursuit computer is, as no-one till now tested it VERY deep...

Test was carried out in our 500m DIVV (deep immersion video vessel). This is our test chamber where we can test housings up to 500m depth, while constantly monitoring what's happening, and video-taping all that goes on.

So once the test starte, the 'heartbeat' went high, waiting for the big 'BANG'!

going down.. 50m 100m 150m 200m... 250m... nothing happens, the unit keeps calculating deco and TTS, (at that time already > 2000 minutes :-)

...only at 255m the window start touching the LCD very softly..

...at 292m (in reality 302m, a bit more as the dept sensor is less correct above 200m) we reach the limit of the dept sensor (30 bar), all of a suddon telling me I'm at surface again.. so the display starts flashing that I missed my deco :-)

... test goes on... showing missed deco.. 350m... 400m.. the spot on the LCD gets bigger as the window touches it more and more..

.... 455m the window cracks the LCD but... the computer keeps working: it keeps flashing the backlight telling me missed deco...

.... 500m... (dept rating of the DIVV).. 520... 540... 560m: I stop the test! The pursuit keeps running, the housing does not implode....

I don't have to tell you I'm extremely satisfied with the test, althoug the goal (crashing the housing) was not reached!

no every one should know why it's called the 'DEEP pursuit'

paul

ps a 'you-tube' will follow :-)

4 pictures of the test : 246m 290m 380m 460m

mverick · 4th October 2008, 17:50

just wondering. do you know if it is warrantied to that depth. Maybe you can get the thing fixed under warranty....

I bet my HSExplorer could do that too. Heck you can drive a truck over it.

Of course since it's really never worked right. You can hit it with a sledge and it won't make it any worse of info...

paulraymaekers · 4th October 2008, 17:54

Quote: (Originally Posted by mverick)

just wondering. do you know if it is warrantied to that depth. Maybe you can get the thing fixed under warranty....

I bet my HSExplorer could do that too. Heck you can drive a truck over it.

Of course since it's really never worked right. You can hit it with a sledge and it won't make it any worse of info...

well, if you send me yourse... I'll give it a try

paul

Humuhumu · 4th October 2008, 19:48

Hi,

the Pursuit is a great computer even if you don't intend to go to 500 M, really a great product !

Cheers

Humuhumu

***jradomski*** · 4th October 2008, 22:23

Quote: (Originally Posted by mverick)

just wondering. do you know if it is warrantied to that depth. Maybe you can get the thing fixed under warranty....

I bet my HSExplorer could do that too. Heck you can drive a truck over it.

Of course since it's really never worked right. You can hit it with a sledge and it won't make it any worse of info...

nah....
limit of the depth sensor is about 200m.. Gene once told me that his original cases he has to over 1700fsw when empty (he was just testing the case integrity).. the current cases are proably softer as they changed the material to make it less brittle.. but once you fill them with oil they essentially become depth unlimited and only the range of the sensor is the limiting factor..

incidentally the intersema sensor is only rated to 14bar absolute working pressure, it has a rated burst pressure of 30bar (although they don't specifiy the number of cycles).. the a/d in the sensor is optimized for its working range and becomes less accurate the further you exceed the working range.. the absolute limit on the reading will vary sensor to sensor based on the calibration data..

J. V. · 4th October 2008, 22:24

Quote:

no every one should know why it's called the 'DEEP pursuit'

Ready for the Rocky's third wall !

Lancer4545 · 4th October 2008, 22:26

WOW......Very impressive and answered some of my earlier questions.

Lance

Chris at Silent World · 4th October 2008, 22:28

Awesome Paul, cant wait to give mine a try!

Please dont send me the test model though

paulraymaekers · 4th October 2008, 22:45

Quote: (Originally Posted by jradomski)

nah....
limit of the depth sensor is about 200m.. Gene once told me that his original cases he has to over 1700fsw when empty (he was just testing the case integrity).. the current cases are proably softer as they changed the material to make it less brittle.. but once you fill them with oil they essentially become depth unlimited and only the range of the sensor is the limiting factor..

incidentally the intersema sensor is only rated to 14bar absolute working pressure, it has a rated burst pressure of 30bar (although they don't specifiy the number of cycles).. the a/d in the sensor is optimized for its working range and becomes less accurate the further you exceed the working range.. the absolute limit on the reading will vary sensor to sensor based on the calibration data..

up to 100m it is within 1%, by 300m it the unit showed 290, and then the pressure sensor went out

youtube nearly ready :-)

paul

***jradomski*** · 4th October 2008, 23:02

Quote: (Originally Posted by paulraymaekers)

up to 100m it is within 1%, by 300m it the unit showed 290, and then the pressure sensor went out

youtube nearly ready :-)

paul

up to 130m it should be very accurate.. over tye normal operating range the accuracy should be -150mbar to +20mbar.. Thats pretty damn good.. (thats assuming 2nd order temp compensation)

the new version 5535c, has upgraded the esd protection and increased from a 15bit to 16bit adc..

4th October 2008, 17:50	#2 (permalink)
mverick ScubaPimp Current Rebreather/s: Megalodon Other CCR Home Build Other Rebreather/s: Other CCR Home Build Join Date: Aug 2005 Posts: 555	Re: How to... dive a Shearwater Pursuit to +500m? just wondering. do you know if it is warrantied to that depth. Maybe you can get the thing fixed under warranty.... I bet my HSExplorer could do that too. Heck you can drive a truck over it. Of course since it's really never worked right. You can hit it with a sledge and it won't make it any worse of info...
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4th October 2008, 17:54	#3 (permalink)
paulraymaekers rEvo's daddy Current Rebreather/s: rEvo Other CCR Home Build Other Rebreather/s: rEvo Other CCR Home Build Join Date: May 2005 Location: belgium Posts: 1,637	Re: How to... dive a Shearwater Pursuit to +500m? Quote: (Originally Posted by mverick) just wondering. do you know if it is warrantied to that depth. Maybe you can get the thing fixed under warranty.... I bet my HSExplorer could do that too. Heck you can drive a truck over it. Of course since it's really never worked right. You can hit it with a sledge and it won't make it any worse of info... well, if you send me yourse... I'll give it a try paul __________________ www.rEvo-rebreathers.com .... the earth is flat, Elvis is alive, and radial scrubbers give longer dwell time than axials...
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4th October 2008, 19:48	#4 (permalink)
Humuhumu Yellow Box Of Delight Current Rebreather/s: Inspiration Vision Other Rebreather/s: Not Bought Yet Join Date: Jan 2007 Location: Blue Planet Posts: 147	Re: How to... dive a Shearwater Pursuit to +500m? Hi, the Pursuit is a great computer even if you don't intend to go to 500 M, really a great product ! Cheers Humuhumu __________________ Humuhumu Nukunuku Apua'a
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4th October 2008, 22:23	#5 (permalink)
*jradomski* Moderator Current Rebreather/s: Inspiration Classic Sport Kiss Optima rEvo Other CCR Other Rebreather/s: Inspiration Vision Evolution Megalodon Classic Kiss rEvo Other CCR Join Date: Mar 2005 Location: "Da" Bronx Posts: 3,113	Re: How to... dive a Shearwater Pursuit to +500m? Quote: (Originally Posted by mverick) just wondering. do you know if it is warrantied to that depth. Maybe you can get the thing fixed under warranty.... I bet my HSExplorer could do that too. Heck you can drive a truck over it. Of course since it's really never worked right. You can hit it with a sledge and it won't make it any worse of info... nah.... limit of the depth sensor is about 200m.. Gene once told me that his original cases he has to over 1700fsw when empty (he was just testing the case integrity).. the current cases are proably softer as they changed the material to make it less brittle.. but once you fill them with oil they essentially become depth unlimited and only the range of the sensor is the limiting factor.. incidentally the intersema sensor is only rated to 14bar absolute working pressure, it has a rated burst pressure of 30bar (although they don't specifiy the number of cycles).. the a/d in the sensor is optimized for its working range and becomes less accurate the further you exceed the working range.. the absolute limit on the reading will vary sensor to sensor based on the calibration data.. __________________ Joe Radomski CCR Trimix Instructor Trainer ANDI Instructor Trainer Director #10 All posts are personal opinions and DO NOT reflect any affiliated agency unless specifically stated.
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4th October 2008, 22:24	#6 (permalink)
J. V. RBW Member Current Rebreather/s: rEvo Other Rebreather/s: Not Bought Yet rEvo Join Date: Mar 2006 Location: Lot & Savoie Posts: 249	Re: How to... dive a Shearwater Pursuit to +500m? Quote: no every one should know why it's called the 'DEEP pursuit' Ready for the Rocky's third wall ! __________________ -------------------- Jacques NPSFQQA-EDS IT # 007 (remué non agité)
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4th October 2008, 22:26	#7 (permalink)
Lancer4545 RBW Member Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Jun 2007 Location: Cairns QLD Australia Posts: 745	Re: How to... dive a Shearwater Pursuit to +500m? WOW......Very impressive and answered some of my earlier questions. Lance __________________ You can run but you can't hide! ISC Appointed Megalodon Dealer for East Australia http://www.closedcircuitdivers.com.au info@closedcircuitdivers.com.au
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4th October 2008, 22:28	#8 (permalink)
Chris at Silent World RBW Member Current Rebreather/s: rEvo Other Rebreather/s: rEvo Join Date: Jan 2008 Location: Key Largo Posts: 95	Re: How to... dive a Shearwater Pursuit to +500m? Awesome Paul, cant wait to give mine a try! Please dont send me the test model though __________________ Chris http://www.silentworldkeylargo.com
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4th October 2008, 22:45	#9 (permalink)
paulraymaekers rEvo's daddy Current Rebreather/s: rEvo Other CCR Home Build Other Rebreather/s: rEvo Other CCR Home Build Join Date: May 2005 Location: belgium Posts: 1,637	Re: How to... dive a Shearwater Pursuit to +500m? Quote: (Originally Posted by jradomski) nah.... limit of the depth sensor is about 200m.. Gene once told me that his original cases he has to over 1700fsw when empty (he was just testing the case integrity).. the current cases are proably softer as they changed the material to make it less brittle.. but once you fill them with oil they essentially become depth unlimited and only the range of the sensor is the limiting factor.. incidentally the intersema sensor is only rated to 14bar absolute working pressure, it has a rated burst pressure of 30bar (although they don't specifiy the number of cycles).. the a/d in the sensor is optimized for its working range and becomes less accurate the further you exceed the working range.. the absolute limit on the reading will vary sensor to sensor based on the calibration data.. up to 100m it is within 1%, by 300m it the unit showed 290, and then the pressure sensor went out youtube nearly ready :-) paul __________________ www.rEvo-rebreathers.com .... the earth is flat, Elvis is alive, and radial scrubbers give longer dwell time than axials...
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4th October 2008, 23:02	#10 (permalink)
*jradomski* Moderator Current Rebreather/s: Inspiration Classic Sport Kiss Optima rEvo Other CCR Other Rebreather/s: Inspiration Vision Evolution Megalodon Classic Kiss rEvo Other CCR Join Date: Mar 2005 Location: "Da" Bronx Posts: 3,113	Re: How to... dive a Shearwater Pursuit to +500m? Quote: (Originally Posted by paulraymaekers) up to 100m it is within 1%, by 300m it the unit showed 290, and then the pressure sensor went out youtube nearly ready :-) paul up to 130m it should be very accurate.. over tye normal operating range the accuracy should be -150mbar to +20mbar.. Thats pretty damn good.. (thats assuming 2nd order temp compensation) the new version 5535c, has upgraded the esd protection and increased from a 15bit to 16bit adc.. __________________ Joe Radomski CCR Trimix Instructor Trainer ANDI Instructor Trainer Director #10 All posts are personal opinions and DO NOT reflect any affiliated agency unless specifically stated.
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