Cable pressure-resistant / vs ambient

  • To produce cable pressure-resistance, considerable effort is required: Sealing the connectors and higher demands on the pressure resistance of the displays.
  • This results in a harness that is resistant to water and moisture, and is durable and resistant to corrosion on the conductors.


KBH radial vs axial

  • We prefer the axial design, which is simpler in construction and has proven itself.
  • The gas must flow through the entire scrubbing canister and has no way of "taking shortcuts", enhancing safety.
  • This method of gas diversion optimally uses the absorbant material.


KBH pre-fill cartridges vs granules

  • The advantages of pre-fill absorbers are that filling occurs at the manufacturer.The absorber manufacturer is legally responsible for any problems of inadequate filling .

Disadvantage of pre-fill absorbers:

  • High price
  • Poor or no availability in diving stations
  • Not compatible with other rebreathers.
  • Travel requires heavy items to be carried in the luggage at additional expense.

Advantage granules:

  • Inexpensive
  • Compatible
  • Available at all rebreather-diving stations


Breathing bag backmounted vs frontmounted over shoulder

Counterlungs over the shoulder and in front have the substantial disadvantage that they restrict the freedom of movement of the diver and have an adverse effect on the trim.

In Submatix rebreathers (except Combo2 SMS and 200) are the counter lungs mounted on the back. The lung counter goes over the complete surface of the frame, from the shoulder to the hip. There is only 5mm backplate between the counter lungs and the diver. The counter-lung is directly on the body of the diver. By this construction, optimal breathing values ​​are reached.

There are no motion disabling parts on the shoulders and in the front. Also can be dispensed with T blocks.

Which this system has proven itself shows, among other things in the current distribution at other rebreather manufacturers.


Sensor calibration with air vs oxygen  

Sensors calibrated only with oxygen are subject to error in many cases.

  • Oxygen is not always 100% oxygen. When a sensor is calibrated, for example, with 95% oxygen, there is a measurement error of 5% from the start.
  • If a sensor has no longer the full capacity after an oxygen calibration there is also a corresponding measurement error.
  • calibrated. Example: A sensor has 90% capacity. After calibration, there is a measurement error of 10%.

The diver doesn't receive information about the capacity.

  • The voltage (mV) does not give reliable information about the capacity.

Two-point calibration with air and oxygen:

  • The sensor is calibrated with air. (Air is 21% oxygen worldwide)
  • The sensor is tested with oxygen. Here the diver receives the information about the capacity of the sensor. (At least 95%)
  • The voltage (mV) does not give reliable information about the capacity.

Solenoid with flow nozzle

  • If you use a solenoid without a flow nozzle in a rebreather, in the event of an obstruction, there will be a rapid rise in ppO2.
  • Oxygen will be introduced into the loop with medium-pressure (usually 9 Bar).
  • Within a very sort time, there can be a fatal ppO2 in the loop, and the diver has a very short time to react.
  • However, if you use the solenoid in conjunction with a flow nozzle, in the event of obstruction, the ppO2 will gently rise, leaving the diver more time to react to ppO2 warnings.
  • Otherwise is a fklow nozzle a good solution to protect the solenoid from particals


Along pressure tight wires vs ambient pressure tight systems

In ambient systems, cables are laid in medium-pressure hoses. The complete Electronic is located in the ambient pressure of the corresponding depth. In semi-ambient systems cables are laid without MP hoses, the electronic befinddet is in  the ambient pressure of the current depth.

Advantage of this design: Housing for handsets, computers ect. do not have to withstand the ambient pressure.

Disadvantage: The existing moisture in the loop penetrates through the cable in the Electronic and destroys them over time through occurring corossion. Cable and battery contacts must be replaced regularly.

A further disadvantage of semi Ambient systems is the possibility of failure due to overpressure in the system. This problem may arise because the existing ambient pressure in the cables and in the system can not be removed quickly enough and it comes to explosive destruction of components or cables. (Electronic Deco accident)

Submatix used prints eights housing for all Electronic assemblies. All cables are molded into the screw longitudinal pressure sealing. All enclosures are tested at 15 bar pressure. This prevents the moisture and pressure in the Electronic System arrives.


Redundancy from electronic systems

Submatix used to establish a genuine redundancy  two separate systems.

Main system: SPX 42 dive computer  / 3 oxygen sensors / HUD / 3 separate power systems

Bail Out System: Oxyscan with separate oxygen sensor and separate power supply. The Oxyscan is mechanically and electrically completely separated from the mainn system.

In case of failure of the main system its possible to use the Oxyscan to finish the dive.