Yorkshire Divers

Dive Life Dive Shop - Manchester
Go Back   YD Scuba Diving Forums > Dive Kit and Equipment > Regulators and Cylinders
pressure gauge question pressure gauge question
User Name
Password

Welcome to the YD Scuba forums.

You are currently viewing our boards as a guest which gives you limited access to view most discussions, articles and access our other FREE features. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload your own photos and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!

If you have any problems with the registration process or your account login, please contact contact support.

Regulators and Cylinders: Discuss pressure gauge question in the Dive Kit and Equipment forums: hi folks, my sunnto pressure gauge face has a crack across the middle approx 1 cm starting from the central ...

Reply
 
LinkBack Thread Tools Display Modes
  #1 (permalink)  
Old 30-09-07, 02:06 AM
frisky fraser's Avatar
New Member
  

Join Date: Oct 2003
Location: central scotland
Posts: 140
frisky fraser can find the seaside on a mapfrisky fraser can find the seaside on a mapfrisky fraser can find the seaside on a mapfrisky fraser can find the seaside on a mapfrisky fraser can find the seaside on a map
pressure gauge question
hi folks,
my sunnto pressure gauge face has a crack across the middle approx 1 cm starting from the central brass pin for the needle,now my question is this,as i have used it prior to noticing this,can i presume,that there must be an internal "face",which is pressurised,and the one that has the small crack,is a protective "face" only.
cheers,
Fraser.
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!
Reply With Quote
  #2 (permalink)  
Old 30-09-07, 02:12 AM
Richard Mason's Avatar
YDs Most Southerly Monkey
  

Join Date: Feb 2006
Location: Hobart, Tasmania, Australia
Posts: 4,374
Richard Mason is never out of the waterRichard Mason is never out of the waterRichard Mason is never out of the waterRichard Mason is never out of the waterRichard Mason is never out of the waterRichard Mason is never out of the waterRichard Mason is never out of the waterRichard Mason is never out of the waterRichard Mason is never out of the waterRichard Mason is never out of the waterRichard Mason is never out of the water
Quote:
Originally Posted by frisky fraser
hi folks,
my sunnto pressure gauge face has a crack across the middle approx 1 cm starting from the central brass pin for the needle,now my question is this,as i have used it prior to noticing this,can i presume,that there must be an internal "face",which is pressurised,and the one that has the small crack,is a protective "face" only.
cheers,
Fraser.
Yes. They'd be pretty brave to put 230 Bar+ behind a bit of glass.

If you think about it, a couple of square inches of glass with that pressure behind it would be resisting (or trying to resist) around 6000 lbs, or about 2.7 tonnes of force.

Conventional SPGs (ie not air-int computers) are simply a bourdon tube, a thin copper tube in a 3/4 circle. When you apply pressure to the internal surfaces via the HP hose, it straightens out a bit, which pushes the spodrod against the giggle pin (making this bit up) which deflecxts the needle. You read the pressure indicated on the card.

BACK

FRONT (this reads both pressure & vacuum but the principles the same)

If the copper tube ruptures, the face could, I always reckon, blow out, which is why I still hold it away from anywhere sensitive when I turn the air on.

Seeing how simple it is makes you realise why you should only trust em to + or - 10 Bars.
__________________
Doing It Richard

As I got older, I thought it was good that I seemed to be getting more patient; but it actually turns out that I just don't give a sh!t.

"Earth First!!!" - (We can log the other planets later)
Last edited by Richard Mason : 30-09-07 at 02:31 AM.
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!
Reply With Quote
  #3 (permalink)  
Old 30-09-07, 02:18 AM
Rob Dobson's Avatar
Sponsored by The Betty Ford Clinic and Prozac
  

Join Date: Jul 2005
Location: Oxford - missing the east end
Posts: 1,916
Rob Dobson is a scuba diver - cold waterRob Dobson is a scuba diver - cold waterRob Dobson is a scuba diver - cold waterRob Dobson is a scuba diver - cold waterRob Dobson is a scuba diver - cold waterRob Dobson is a scuba diver - cold waterRob Dobson is a scuba diver - cold waterRob Dobson is a scuba diver - cold waterRob Dobson is a scuba diver - cold waterRob Dobson is a scuba diver - cold waterRob Dobson is a scuba diver - cold water
There's the glass and then the space where the needle moves over the dial (unpressuried). The glass is strong enough (in theory) to protect the air space behind it to a certain (stated) pressure. If your glass is cracked then the strength of the glass is compromised and I'd suggest you replace it.

You could get several years of service out of it but I personally wouldn't chance it.

HTH
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!
Reply With Quote
  #4 (permalink)  
Old 30-09-07, 08:38 AM
quoggle's Avatar
never odd or even
  

Join Date: May 2006
Location: Gateway to Gower
Posts: 228
quoggle is a snorkellerquoggle is a snorkellerquoggle is a snorkellerquoggle is a snorkellerquoggle is a snorkellerquoggle is a snorkellerquoggle is a snorkellerquoggle is a snorkellerquoggle is a snorkellerquoggle is a snorkellerquoggle is a snorkeller
better safe than sorry,
If sea water ever gets in and corrodes the copper....
__________________
Sentio aliquos togatos contra me conspirare.

Cofio Cilmeri

Hostes alienigeni me abduxerunt.
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!
Reply With Quote
Reply

« wont fit? | twinverted »

Thread Tools
Display Modes
Linear Mode Linear Mode

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Sponsored Links

Yorkshire Divers - RSS Feed
All times are GMT +1. The time now is 12:08 PM.
Powered by vBulletin
Copyright ©2000 - 2008, Jelsoft Enterprises Ltd.
Content Relevant URLs by vBSEO 3.2.0
Trademark and all rights reserved : © YD.com Ltd (2006)
YD.com Ltd (Registered in England - 05886696)
Other sites : Golf Clubs | New Premiership Football Kits | MP3 Portable Players | MP3 Players For Sale | Replica Football Kits | Cheap Football Boots

Advertise - Contact Us - Yorkshire Divers - Sitemap - Privacy Statement - Terms & Conditions - Top
Forums Directory