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Formulansx · 2 February 2012, 04:15 PM

Im working on a theory to pressure test my datejust using a mityvac. Does anyone know what the pressure test specs are?? Pressure drop over time etc?? Thanks all.

Andad · 2 February 2012, 07:30 PM

You can't test pressure with a vacuum - in fact.

In theory if it holds -0.8 Bar it will be waterproof to 12000 metres.

'Theormitycreticaly'.

Scottish word - means 'no chance'.

MoBe · 2 February 2012, 10:28 PM

Too scientific for me.

I`d just let Rolex do it.

Rikki · 2 February 2012, 11:50 PM

Needed a good laugh this morning

Formulansx · 3 February 2012, 02:29 AM

The volume/chamber that you're pulling a vacuum on with the tool "mityvac" is being displaced as pressure out of the pressure port on the top of the unit since it is a closed system. Don't let the name of the tool fool you. Worst comes to worst I can calculate it myself if the information is not available.

dom_ · 3 February 2012, 04:25 AM

The machine I use at work (witschi proofmaster s) does a vacuum test before a pressure test only to make sure nothing is seriously wrong before the pressure comes in. So a loose glass or not fully on back stops the pressure crushing a glass in to the watch face for example.
With the standard 100m test it does a vacuum test of 0.7 bar, but obviously the vacuum pressure has nothing to do with the water resistance rating.

2 February 2012, 04:15 PM	#1
Formulansx "TRF" Member Join Date: Dec 2011 Real Name: Guy Gadbois Location: Norcal Watch: Rolex,Omega,Seiko Posts: 1,759	Pressure test specs Im working on a theory to pressure test my datejust using a mityvac. Does anyone know what the pressure test specs are?? Pressure drop over time etc?? Thanks all.

2 February 2012, 07:30 PM	#2
Andad 2024 SubLV41 Pledge Member Join Date: Nov 2006 Real Name: Eddie Location: Australia Watch: A few. Posts: 37,533	You can't test pressure with a vacuum - in fact. In theory if it holds -0.8 Bar it will be waterproof to 12000 metres. 'Theormitycreticaly'. Scottish word - means 'no chance'. __________________ E

2 February 2012, 11:50 PM	#4
Rikki TechXpert Join Date: Jun 2009 Real Name: Rik Dietel Location: Seminole Fla Watch: 5512 s/s Sub Posts: 1,818	Needed a good laugh this morning __________________ Century 21 Certified watchmaker Omega Service Provider Trained Omega OWME Certified. Rolex Parts Account Holder.

2 February 2012, 10:28 PM	#3
MoBe "TRF" Member Join Date: Sep 2011 Location: Canada Posts: 6,773	Too scientific for me. I`d just let Rolex do it.

3 February 2012, 02:29 AM	#5
Formulansx "TRF" Member Join Date: Dec 2011 Real Name: Guy Gadbois Location: Norcal Watch: Rolex,Omega,Seiko Posts: 1,759	The volume/chamber that you're pulling a vacuum on with the tool "mityvac" is being displaced as pressure out of the pressure port on the top of the unit since it is a closed system. Don't let the name of the tool fool you. Worst comes to worst I can calculate it myself if the information is not available.

3 February 2012, 04:25 AM	#6
dom_ "TRF" Member Join Date: Jan 2012 Location: England Posts: 134	The machine I use at work (witschi proofmaster s) does a vacuum test before a pressure test only to make sure nothing is seriously wrong before the pressure comes in. So a loose glass or not fully on back stops the pressure crushing a glass in to the watch face for example. With the standard 100m test it does a vacuum test of 0.7 bar, but obviously the vacuum pressure has nothing to do with the water resistance rating.

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