Quote: (Originally Posted by
peter)
Have you started to ship units to customers yet?
If not, when do you expect to start ship units?
We have a component or two which we want to change out and are awaiting the suppliers. There are a few software changes being made which will make the unit simpler to use and then we need formal testing done in line with EN14143. This may take a month or two. Once this is complete, we will take orders.
At the expense of maximising sales from the announcement, we at Narkedat90 have taken the decision not to take orders until we are satisfied that the user will have no issues. In the long run, we think this approach will be better for us and the users.
Quote: (Originally Posted by
Soren Thomsen)
Hi there,
In the first chart I notice a drop in 0.1 PPO2 drop during a 10m or so accent. Is this drop caused by the solenoid being psysical unable to deliver more O2 or the firing algorithme?
Is the algorithm/solenoid able to maintain life substaining PPO2 during an uncontrolable accent with any given setpoint?
I don't know much about this so I can't tell if your chart is good or same as others, so please bare with me.
Cheers
Soren
Soren,
Thankyou for taking the time to look at our data. The firmware was changed between dive 1 and the others on the post. The firmware is indicated on the bottom of the graph, the third graph is indicative of the PO2 maintennance upon ascent.
Injection from our solenoid gives about 15ltr/min, the injection timing can be altered by a gain setting in the software. The DP will be able to maintain life substaining PPO2 during an uncontrolable accent to a point. Defining an uncontrollable ascent could mean 100m/min, that would likely be impossible to acheive, but we will meet the requirements of the standard.
The quotes below are from EN14143.
5.7.2 Oxygen partial pressure setpoint maintenance
In apparatus with a fixed oxygen partial pressure setpoint the inspired partial pressure of oxygen shall be maintained within +/-
0,10 bar during constant depth phases of the dive.
During the ascent phase the inspired partial pressure of oxygen may reduce to a minimum of 0,5 bar below the set point but shall regain steady state set point within 1 min of halting an ascent.
6.7 Inspired oxygen level
When testing inspired oxygen levels, the dive profile shall be conducted with a descent rate of 30 m min-1 and an ascent rate of 20 m min-1.