pointy

My previous post contained an unstable link. Here is a link to my photo sets on Flickr. The relevant set is titled "Cheap vacuum leak check". If you click on any of the thumbnails, you can read details about Miso's simple valve, the altimeter used as a vacuum indicator, and my home-made vacuum pump. I hope this works better:

http://www.flickr.co...mccracken/sets/

John McCracken

Hello John,

 

Could you put the link to the chinese small digital barometer? I was also looking for one small enough...

Hello David, 

The cheap Chinese barometer was only good for telling the time inside my housing. I agree that a good barometer gives better information than the usual system of indicator lights - That was your thinking from an earlier thread.  I eventually got a "Sun Altimeter/barometer 202 M", which works well for me.

A simple, well made valve from Miso at Vivid Housing cost 60 Euros. The barometer cost $60. and a vacuum pump that I devised cost less than $20 to make. I tested my housing, with the valve on and vacuum applied, in the dive store's pressure tank at a simulated depth of 50 meters. There was no leak, so I feel good about using this fitting on my next trip.

I have included a link to this custom made system from my Flickr account.  

http://www.flickr.com/photos/pointymccracken/8723697445/in/set-72157633459277984/ 

John McCracken

Returned from Lembeh hours ago and have not yet contacted Miso.

There is a "0" ring seat design problem in the unit cover cap.and a similar one in the pump to unit threaded adapter.

This is easily corrected and I will be contacting him tomorrow. I had a slight leak in one of two units - just a drop or two.

This remains an excellent unit!

Hello Okuma,

I requested a spare cap because I worry about loosing small bits. Since I had two, I was able to spot a difference between them. I could feel the O ring of one of them make contact with the valve rim before it resisted further turning (as it should). The O-ring of the bad cap came to a sudden stop because the recess for the O ring was so deep that there was no seal at all against the rim.

This didn't cause a problem for me. With the good cap on, I tested my housing with vacuum applied in the dive store's pressure tank to a simulated depth of 50 meters. There was no leak. Anyway, I started to wonder: What would happen if water got past the cap? In your case, did the rubber valve prevent water from entering the housing? How deep did you go when you first noticed there was a problem with the cap?

Miso made a very simple valve for me, which I am very pleased with. I will describe it in another thread.

John McCracken

The strobe has been shipped out.

John McCracken

Hello John,

 

Could you put the link to the chinese small digital barometer? I was also looking for one small enough...

Sorry David,

The previous link didn't work. The one I ordered looks like this:

http://www.made-in-c...ass-SR106-.html

You can find them on ebay. It may be junk but it didn't seem like much of a risk for the price. It just might be perfect.