Hollis Prism 2 Rebreather - In stock at TAL Scuba Dorset, CE Approved CCR
Hollis Prism 2 CE Approved - In stock at TAL Scuba Ltd
We are please to say we have just received our first shipment of the NEW CE approved Hollis Prism 2 CCRs,
We have 4 NEW Prism 2 CCRs looking for a new owner... Order yours now as they will sell fast!
Pop in the shop and take a look!
We offer a full range of training with PADI, RAID, IART and TDI, both user and Instructor levels.
"The Hollis Prism 2 is an awesome rebreather that I have been diving and teaching this unit for some 6-7 year now. Now we have CE approval we are going to see a lot of these great units. Now available in both Front Mounted Counter lungs and now also available with Back Mounted Counter Lung. Which one do you prefer?" - Trevor A Leyland
The PRISM family of rebreathers has a long and illustrious history
it is considered one of the foundation platforms of the modern day electronically controlled “sport” rebreather. The PRISM 2, like its predecessor the PRISM Topaz, is a digitally controlled electronic closed circuit rebreather with split Front-Mounted Counterlungs (FMCL) or Back-Mounted Counterlungs (BMCL). It incorporates a radial design scrubber for the best possible duration and work-of-breathing. All gas delivery systems on the PRISM 2 have both automatic and manual function.
Hollis Prism 2 CCR - MANUAL CONTROL OR COMPUTER CONTROL?
One of the ongoing debates when discussing rebreather safety is whether manually controlled or electronically controlled rebreathers are safer. From the day in 1995 when PRISM Topaz class #1 was held in Hermosa Beach, CA, students were taught to “fly” their rebreathers manually by watching their secondary analog displays and manually injecting oxygen and diluent as needed.
From day one, PRISM students were taught that the primary control system was always the divers brain. It wasn’t until the last dive of the last day of class that students were told, “OK, you can turn on your electronics and experience a computer controlled dive”. Diving with the computer monitoring the oxygen and the user keeping an eye on everything with (at that time) a Heads Up Display primary and a wrist-mounted analog secondary sure kept
us busy, but we quickly realised that the computer was a LOT better at closely maintaining a setpoint! We also realised that our instructor had trained us to be manually controlled rebreather divers with the safety of “computer over-watch”.
Why two independent monitoring systems in the Hollis Prism 2 CE Approved CCR rebreather?
Simply put, electronics, batteries and wiring combined with salt water (or even fresh water) do not get along well together. While we can seal circuit boards and wiring interfaces against water intrusion, rebreathers should have
a diver accessible compartment to change batteries, and because of this need for accessibility, flooding can occur.
This is the Achilles heel of rebreathers with on-board electronics. Any time an O-ring sealed Compartment is unsealed, the potential for debris to get on the O-ring and cause the compartment to flood during the next dive is increased.
So, with two separate systems onboard with separate battery compartments, if one battery compartment floods and destroys the battery, we simply switch to the other monitoring system to safely end the dive. When our dive is over, we dispose of the wiring harness and battery, clean the compartment and put in a fresh battery and new O-ring(s).
The PRISM 2 Comes with a choice of either a Front Mounted split counterlung design or a Back Mounted counterlung design.
We also sell conversion kits to convert from BMCL to FMCL and we can supply parts to go the other way to.
Hollis Prism 2 loop gas flow
The gas flows through the loop from left to right shoulder in both designs, which has become a standard in the recreational rebreather market. Figure 1.1a shows the Front-Mounted Counterlung design.
What to know more about the Hollis Prism 2 CCR rebreather
Find out more Download the Hollis Prism 2 Manual
Order yours now[product id="12154"]