Hammerhead Electronics Design Notes

Juegensen Marine is the manufacture of the most advanced eCCR Electronics on the planet. Since it’s inception, Juergensen Marine has developed no less that 7 models of the eCCR controller and 4 vibrating HUDs, each one more advanced and feature packed than the last.

The current range of diving electronics in service are:


All of our current eCCR controller housings are machined form a solid block Delrin. The viewing window is cut from ¼” Lexan sheets and the entire housing is fastened with stainless steel hardware. The current DIVA line is comprised of 316 stainless steel bodies, Lexan lenses and Swaglok water tight cable fittings. These materials have been chosen based on requirements of the divers, the aquatic environment and years of trial and error.

Switches – We outfit all of wrist units with stainless steel housed Piezo Crystal switches. Selected for their reliability and ease of use, these switchs work flawlessly wet or dry and even while wearing heavy gloves. We have spent years of testing and countless iterations to prove these switches to be the best available on the market.

We believe these combinations to be the best and most cost effective way to produce safe units. That’s not to say we aren’t always in search of the next best thing, we make it a point to investigate new materials and ideas as soon as they become viable.


As we said in the eCCR section we have no electronics in the breathing loop. This is to protect the electronics from corrosion that might cause transient or complete bridging within the electronics. As we have found even when potted in epoxies or submersed in oils, water can still find its way in and slowly create issues.  All electronics found in a Hammerhead eCCR systems are located inside their own 1 ATM housing and connected to the rest of the system via Juergensen water block conductor.

Automatic Transmission” is the term we use for the automatic Set-Point change-over algorithms built into every electronics set we sell. Juergensen Marine first pioneered and refined this feature which is now become an industry standard in the rebreathing world.

How it works – Select your set point at anything 1.0 or below, and the Hammerhead will raise your loop ppO2 to that point. Set it to anything above, and it goes into “Automatic” mode, whereby:

  • At the Surface, it holds ppO2 to .4
  • At 1 m it switches to 1.0 pp02
  • At 3 m it switches to selected Set Point pp02

Divided operations – As a standard electronics set up we believe it is a safer options to divide the necessary wrist unit operations between the primary and secondary battery supplies. Meaning the primary battery is only responsible for the primary display and firing the solenoid. The DIVA falls to the secondary’s battery supply. We pride ourselves on the limited battery consumption our units have and with that we still wish to maximize our efficiency.  It is also with out saying two are better then one, if one side of the control system should fail the entire system won’t become compromised.