jjccr negative pressure test

marco73 · July 14th, 2012, 09:27 AM

Hello all

I've tried negative test pressure on my new jjccr (200 min of dive) for all night (12 hours) but does not pass.

The negative test pass only after about 30 mins - 45 mins.

How many time I can consider secure the negative pressure test?

have a nice dive :D

MArco

***Clare*** · July 14th, 2012, 09:58 AM

I'd be content with that.

marco73 · July 14th, 2012, 10:08 AM

Quote: (Originally Posted by Clare)

I'd be content with that.

5 min 10min 30 min is enought?

**Mark Chase** · July 14th, 2012, 10:49 AM

Quote: (Originally Posted by marco73)

5 min 10min 30 min is enought?

5 mins is about 4 mins longer than i usualy do

I became prety relaxed about Neg testing when i baught a KISS. You cant do a neg on those for long without dammaging the ADV

On my old Inspo I could hold a neg overnight no problem at all. i dont know why a JJ cant do this but it cant.

One of the things i beleive is a problem is the spring type clamps on the breathing loop. I dont beleive they provide a seel that will stand up to the presure of a neg test

My units neg teast have improved since i got the Drager connectors for my Golum BOV.

ATB

Mark

Johan Isaksson · July 14th, 2012, 11:23 AM

I usually do somewhere between 3-5 minutes, whenever I forget it and leave it for 15-30 minutes it fails. It doesn't seem to matter much, my unit is always bone dry anyway.

matt · July 14th, 2012, 04:53 PM

On my inspo big leaks will show immediately, you will not get any time on negative.

Smaller leaks do not show for 3 minutes, I do 5-10 mins where I want rock solid for 5 mins and "decent" for 10.

I do not do longer as it is not showing me anything and can cause issues for the ADV diaphragm.

Tiny leaks (shown after 10 mins) do not ingress water IMHO.

I do the same for positive.

Matt.

packeteer · July 15th, 2012, 02:26 AM

yeah, my JJ has never held neg more than about 5 mins

but it's always dry

***tecdiverdude*** · July 15th, 2012, 05:48 AM

Check the rubber disk in the opv .. Could be facing in a little bit.. They do that every now and then after sucking too much of a negative...my JJ holds a neg or a pos overnight easy... Can sometimes hold a neg for days

Remco · July 15th, 2012, 08:23 AM

mine can also get easy hours............ ( DSV .. i do not have a BOV.. )
After i changed the hose connections in tyraps .

I often prepare the unit at home, stick it in the car.
then i drive to dive site and....
Often it is still negative when i arrive on site and get it out the car.

Mark Davies · July 15th, 2012, 10:52 AM

Mine was good until it was 2 years old then it started failing pos and neg tests.

Solution was binning the split rings and going for stainless steel tongued cable ties as recommended by NickB. Holds pos and neg tests indefinitely now.

July 14th, 2012, 09:27 AM	#1 (permalink)
marco73 New Member Join Date: Apr 2012 Location: Genova Posts: 14 Thanks: 0 Thanked 0 Times in 0 Posts	jjccr negative pressure test Hello all I've tried negative test pressure on my new jjccr (200 min of dive) for all night (12 hours) but does not pass. The negative test pass only after about 30 mins - 45 mins. How many time I can consider secure the negative pressure test? have a nice dive :D MArco
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July 14th, 2012, 09:58 AM	#2 (permalink)
*Clare* Retired - going diving Join Date: Nov 2005 Location: UK Posts: 457 Thanks: 74 Thanked 178 Times in 39 Posts	I'd be content with that. __________________ Clare . "Keep away from people who try to belittle your ambitions....Small people always do that, but the really great make you feel that you too can become great." Interested in dive training? Always happy to chat/answer questions so get in touch via PM or visit www.techdiver.co.uk
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July 14th, 2012, 10:08 AM	#3 (permalink)
marco73 New Member Join Date: Apr 2012 Location: Genova Posts: 14 Thanks: 0 Thanked 0 Times in 0 Posts	Quote: (Originally Posted by Clare) I'd be content with that. 5 min 10min 30 min is enought?
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July 14th, 2012, 10:49 AM	#4 (permalink)
Mark Chase ATB=AlwaysTalkingBollocks Join Date: Mar 2012 Location: Kent England Posts: 484 Thanks: 62 Thanked 163 Times in 67 Posts	Quote: (Originally Posted by marco73) 5 min 10min 30 min is enought? 5 mins is about 4 mins longer than i usualy do I became prety relaxed about Neg testing when i baught a KISS. You cant do a neg on those for long without dammaging the ADV On my old Inspo I could hold a neg overnight no problem at all. i dont know why a JJ cant do this but it cant. One of the things i beleive is a problem is the spring type clamps on the breathing loop. I dont beleive they provide a seel that will stand up to the presure of a neg test My units neg teast have improved since i got the Drager connectors for my Golum BOV. ATB Mark
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July 14th, 2012, 11:23 AM	#5 (permalink)
Johan Isaksson New Member Join Date: Mar 2012 Location: Sweden Posts: 68 Thanks: 20 Thanked 16 Times in 8 Posts	I usually do somewhere between 3-5 minutes, whenever I forget it and leave it for 15-30 minutes it fails. It doesn't seem to matter much, my unit is always bone dry anyway.
(Online)

July 14th, 2012, 04:53 PM	#6 (permalink)
matt New Member Join Date: Apr 2012 Location: London Posts: 1,541 Thanks: 168 Thanked 74 Times in 60 Posts	On my inspo big leaks will show immediately, you will not get any time on negative. Smaller leaks do not show for 3 minutes, I do 5-10 mins where I want rock solid for 5 mins and "decent" for 10. I do not do longer as it is not showing me anything and can cause issues for the ADV diaphragm. Tiny leaks (shown after 10 mins) do not ingress water IMHO. I do the same for positive. Matt.
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July 15th, 2012, 02:26 AM	#7 (permalink)
packeteer Big Member Join Date: Mar 2012 Location: Sydney, AU Posts: 68 Thanks: 1 Thanked 2 Times in 1 Post	yeah, my JJ has never held neg more than about 5 mins but it's always dry
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July 15th, 2012, 05:48 AM	#8 (permalink)
*tecdiverdude* Southern Moderation Join Date: Mar 2012 Location: Australia Posts: 424 Thanks: 58 Thanked 30 Times in 17 Posts	Check the rubber disk in the opv .. Could be facing in a little bit.. They do that every now and then after sucking too much of a negative...my JJ holds a neg or a pos overnight easy... Can sometimes hold a neg for days __________________ "DREAM as though you'll live forever LIVE as though you'll die tomorrow"
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July 15th, 2012, 08:23 AM	#9 (permalink)
Remco New Member Join Date: Apr 2012 Location: Netherlands Posts: 161 Thanks: 0 Thanked 0 Times in 0 Posts	mine can also get easy hours............ ( DSV .. i do not have a BOV.. ) After i changed the hose connections in tyraps . I often prepare the unit at home, stick it in the car. then i drive to dive site and.... Often it is still negative when i arrive on site and get it out the car.
(Offline)

July 15th, 2012, 10:52 AM	#10 (permalink)
Mark Davies CCRX Supporter Join Date: Mar 2012 Location: Carmarthenshire Posts: 87 Thanks: 0 Thanked 0 Times in 0 Posts	Mine was good until it was 2 years old then it started failing pos and neg tests. Solution was binning the split rings and going for stainless steel tongued cable ties as recommended by NickB. Holds pos and neg tests indefinitely now.
(Offline)