Cis-Lunar
Encyclopedia
Cis-Lunar is a firm that made computer-controlled closed-circuit automatic rebreather
Rebreather
A rebreather is a type of breathing set that provides a breathing gas containing oxygen and recycled exhaled gas. This recycling reduces the volume of breathing gas used, making a rebreather lighter and more compact than an open-circuit breathing set for the same duration in environments where...

s for scuba diving
Scuba diving
Scuba diving is a form of underwater diving in which a diver uses a scuba set to breathe underwater....

. Some of their production models were in a streamlined casing. The firm's first plan was to develop spacesuit kit. The dot.com crash in early 2000 prevented Cis-Lunar from financing mass production of the MK5 rebreather. The MK5 included design elements aimed at preventing system and mission failures. Support for the original Cis-Lunar rebreathers is now being done by Juergensen Marine
Juergensen Marine
Juergensen Marine Inc. is a USA rebreather gear manufacturer. It was founded in 1996 by Kevin Juergensen. It is an important maker of modern diving rebreathers including modern electronic-controlled fully closed-circuit rebreathers.-Kevin Juergensen:...

.

The word cis-lunar came from Latin
Latin
Latin is an Italic language originally spoken in Latium and Ancient Rome. It, along with most European languages, is a descendant of the ancient Proto-Indo-European language. Although it is considered a dead language, a number of scholars and members of the Christian clergy speak it fluently, and...

 and means "on this side of the moon" or "not beyond the moon", and may refer to the scuba sets described here, or it may refer generically to space travel
Spaceflight
Spaceflight is the act of travelling into or through outer space. Spaceflight can occur with spacecraft which may, or may not, have humans on board. Examples of human spaceflight include the Russian Soyuz program, the U.S. Space shuttle program, as well as the ongoing International Space Station...

 or astronomy
Astronomy
Astronomy is a natural science that deals with the study of celestial objects and phenomena that originate outside the atmosphere of Earth...

.

In 2005, Poseidon, a Swedish diving equipment manufacturer that is a wholly owned subsidiary of DP Scandinavia, acquired Cis-Lunar and retained its founder, Bill Stone
William Stone (caver)
William Stone , known as Bill Stone, is an American caver and explorer, known for exploring deep caves, sometimes with remotely operated vehicles...

of Stone Aerospace, to lead an international engineering team to design a new closed circuit rebreather, the Cis-Lunar Mark VI Discovery.

The Cis-Lunar Mark VI rebreather employs many revolutionary design elements, such as discarding the customary three oxygen sensors and their voting logic in favor of a primary oxygen sensor with constant auto-cell validation and auto-calibration through the entire dive envelope, with a secondary oxygen sensor for redundancy. The Mark VI also utilizes a four computer design that correlates data over its digital communications network to its controlling resource algorithm to monitor such data like exact values, gas cylinder low or excessive consumption or metabolic rates, sensor values, calculated derivative sensor values, calculated response data values, etc.

Bill Stone of Cis-Lunar and Richard Pyle have been interviewed by ScubaMagazine to explain the design philosophy behind the Mark VI and its operation; the interview has been made available as a downloadable video.

External links

  • http://www.nwdesigns.com/rebreathers/CisLunar.htm (Mk VP images)
  • http://photosub.dk/stock_specials_CIS.htm (images)
The source of this article is wikipedia, the free encyclopedia.  The text of this article is licensed under the GFDL.
 
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