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Many people start recording everything down in their log book as taught by their instructor, but in many cases over time they become forgetful or lazy or just simply run out of space and don’t get a new log book.
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Launching later this year is the Beuchat VR200 Evolution regulator, featuring cold/temperate water design, diaphragm first stage, 2 HP ports & 4 MP ports. The second stage has adjustable airflow (venturi and sensitivity adjustment) and a supersoft woven MP hose for added comfort.
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The oxygen analyzer used by divers to measure the percentage of oxygen in their diving gas is a pretty simple instrument (see my previous post). A few months ago I have the brain wave of making it little clever; hence my Advanced O2 Analyzer.
It’s powered by an ATMEL Mega128 micro controller, and uses the typical Teledyne Galvanic O2 cell. The clever bit is the software that you can write for the ATMEL, reading the output from the O2 cell and using it for anything.
As a recreational Nitrox instructor and a keen tech diver, I understood the need for a simple no fuss O2 analyzer; but also there is a need to perform certain calculations such as MOD (Maximum Operating Depth) and EAD (Equivalent Air Depth) both of which are dependant on the PO2 you decide to use.
Hence my device does the following:
Auto calibration in air or 100% O2
Monitoring of O2 cell, auto shut down on error
Battery monitoring
Adjustable PO2 (1.0 to 2.0)
Automatic calculation of MOD & EAD
Battery or main powered
O2 % from 1 to 99.9%
It is all housed in an Otterbox, firstly to keep it dry on the dive boat but also to reduce the exposure of the O2 cell to oxygen which can shorten its life!
I have done some quick tests, and its measuring pretty accurately; however I want to do some more detailed comparative tests between this and a commercial unit. I will update the post once I have more data.
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The Smit Madura (Smit Lloyd 35) is a dive supply tug which sunk in nearly 50 meters of water about 10 years ago. She is sitting upright, and although now draped in some fishing nets is a great wreck to explore. Visited by many large fish like Barracuda, and schools of Batfish it’s a great wreck.
Thanks to Jacob Versteeg, for his important information on the correct name for the wreck. 26 Nov 2008
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