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Recent Posts by Dan Warkander

What’s All the Fuss about CO2 in Breathing Gas?

February 28, 2018

What’s All the Fuss about CO2 in Breathing Gas?

The acceptable level of inspired carbon dioxide (CO2) in diving gear is a controversial topic. Some current standards1,2 permit up to 20 mBar (2 kPa, 2% SEV) as the average inspired CO2 partial pressure, while []

The CO2 Scrubber in a Diver’s Rebreather

June 26, 2017

The CO2 Scrubber in a Diver’s Rebreather

How long a CO2 scrubber lasts during a dive depends on many factors. I will mention some of the ways that CO2 can be removed from the breathing gas. I will also discuss ways to measure how long a scrubber will last (called the endurance time) and some of the factors that change it, but first will discuss why it is necessary at all.

Control of O2 Levels in a Diver's Rebreather

April 21, 2017

Control of O2 Levels in a Diver's Rebreather

There are several methods in use for controlling the O2 level. The difficulty is to a find solution that is relatively simple and that maintains acceptable levels of O2 even when depths and diver workloads change.

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