meg solenoid firing times

tflaris · 22nd July 2008, 15:54

Being a current Evo diver and planning to take my Meg crossover in Sept. I am trying to understand the logic behind the firing on times of the solenoid. With the Evo it appears to be a short or long firing period and seems to be regulated by the amount of difference betwen the current setpoint and the desired setpoint and controller using an algorithm injects the desired amount of O2 to reach the desired setpoint.

With the Meg the users sets a desired firing time. Are there Diver's changing this at depth as the ANDI manaul suggests or do you find yourself choosing one over another.

The manual makes reference to choose the best firing sequence based on depth and workload. Are these guidelines stated or in print somewhere?

Thanks
Tony Flaris

netmage · 22nd July 2008, 16:49

Quote: (Originally Posted by tflaris)

Being a current Evo diver and planning to take my Meg crossover in Sept. I am trying to understand the logic behind the firing on times of the solenoid. With the Evo it appears to be a short or long firing period and seems to be regulated by the amount of difference betwen the current setpoint and the desired setpoint and controller using an algorithm injects the desired amount of O2 to reach the desired setpoint.

With the Meg the users sets a desired firing time. Are there Diver's changing this at depth as the ANDI manaul suggests or do you find yourself choosing one over another.

The manual makes reference to choose the best firing sequence based on depth and workload. Are these guidelines stated or in print somewhere?

Thanks
Tony Flaris

In the new software, ASP mode allows for adaption in the firing times as the seonsors detect deviance from setpoint, you set a min and max and the controller ratchets up the pO2 as needed until max is reached. This mode is intended for the rapid descent phase of the dive. At depth, you select normal setpoint.

During training one of our exercises was to swim full out boogie and see if the default injection rate can keep up with you... I think most find it can. The wattmeiser and jaksa solenoid variations have different sized orifaces, thus require a different firing/pause rate.

Other than the release notes, I don't think I've seen anything in print, and most folks I know use the default firing sequences.

tflaris · 23rd July 2008, 04:09

[quote=netmage;199286]In the new software, ASP mode allows for adaption in the firing times as the seonsors detect deviance from setpoint, you set a min and max and the controller ratchets up the pO2 as needed until max is reached. This mode is intended for the rapid descent phase of the dive. At depth, you select normal setpoint.

During training one of our exercises was to swim full out boogie and see if the default injection rate can keep up with you... I think most find it can. The wattmeiser and jaksa solenoid variations have different sized orifaces, thus require a different firing/pause rate.

Other than the release notes, I don't think I've seen anything in print, and most folks I know use the default firing sequences.[quote]

With the original software 2.0 are there firing options that work
better in high work situations? Or what was the intent of ISC when offering these variations in firing times.

snicks · 23rd July 2008, 05:23

I dont see ASP to modify firing times. The off-times are set in the menu and are not influenced by your setpoint (be it ASP or anything from MAN to 1.4).

The modification with 2.5 was the "Adaptive Injection Algorithm" which modifies firing duration in dependence "on the rate of response of current PO2 vs. desired PO2". I think that was different with the older APECS versions.

Have never changed my solenoid off-time, but Im a noob anyway

Greets
Dirk

**Fun Under Pressure** · 23rd July 2008, 18:08

I think ISC wont prevent O2 spikes on deeper dives. So you can change the pause beetween each solonid fire. I fly my unit manuelly and so don´t need this option at the time, but is nice to have.....

**Padipro** · 26th July 2008, 03:57

I don't use the default injection timing with my unit. I have the Jaksa solenoid with the timing set to 1.5 on with 6 seconds between firings. It usually fires twice in order to bring the PO2 up to the set point I've selected but it maintains the set point perfectly.

22nd July 2008, 15:54	#1 (permalink)
tflaris God save the Queen Current Rebreather/s: Evolution Megalodon Other Rebreather/s: Evolution Megalodon Join Date: Oct 2006 Location: Neptune Beach, Florida Posts: 274	meg solenoid firing times Being a current Evo diver and planning to take my Meg crossover in Sept. I am trying to understand the logic behind the firing on times of the solenoid. With the Evo it appears to be a short or long firing period and seems to be regulated by the amount of difference betwen the current setpoint and the desired setpoint and controller using an algorithm injects the desired amount of O2 to reach the desired setpoint. With the Meg the users sets a desired firing time. Are there Diver's changing this at depth as the ANDI manaul suggests or do you find yourself choosing one over another. The manual makes reference to choose the best firing sequence based on depth and workload. Are these guidelines stated or in print somewhere? Thanks Tony Flaris __________________ "Except for this one, I have come to the conclusion that all generalizations are false" -Jim Hayes
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22nd July 2008, 16:49	#2 (permalink)
netmage Tim Owens Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Dec 2005 Location: Coconut Creek, FL Posts: 704	Re: meg solenoid firing times Quote: (Originally Posted by tflaris) Being a current Evo diver and planning to take my Meg crossover in Sept. I am trying to understand the logic behind the firing on times of the solenoid. With the Evo it appears to be a short or long firing period and seems to be regulated by the amount of difference betwen the current setpoint and the desired setpoint and controller using an algorithm injects the desired amount of O2 to reach the desired setpoint. With the Meg the users sets a desired firing time. Are there Diver's changing this at depth as the ANDI manaul suggests or do you find yourself choosing one over another. The manual makes reference to choose the best firing sequence based on depth and workload. Are these guidelines stated or in print somewhere? Thanks Tony Flaris In the new software, ASP mode allows for adaption in the firing times as the seonsors detect deviance from setpoint, you set a min and max and the controller ratchets up the pO2 as needed until max is reached. This mode is intended for the rapid descent phase of the dive. At depth, you select normal setpoint. During training one of our exercises was to swim full out boogie and see if the default injection rate can keep up with you... I think most find it can. The wattmeiser and jaksa solenoid variations have different sized orifaces, thus require a different firing/pause rate. Other than the release notes, I don't think I've seen anything in print, and most folks I know use the default firing sequences.
(Online)

23rd July 2008, 04:09	#3 (permalink)
tflaris God save the Queen Current Rebreather/s: Evolution Megalodon Other Rebreather/s: Evolution Megalodon Join Date: Oct 2006 Location: Neptune Beach, Florida Posts: 274	Re: meg solenoid firing times [quote=netmage;199286]In the new software, ASP mode allows for adaption in the firing times as the seonsors detect deviance from setpoint, you set a min and max and the controller ratchets up the pO2 as needed until max is reached. This mode is intended for the rapid descent phase of the dive. At depth, you select normal setpoint. During training one of our exercises was to swim full out boogie and see if the default injection rate can keep up with you... I think most find it can. The wattmeiser and jaksa solenoid variations have different sized orifaces, thus require a different firing/pause rate. Other than the release notes, I don't think I've seen anything in print, and most folks I know use the default firing sequences.[quote] With the original software 2.0 are there firing options that work better in high work situations? Or what was the intent of ISC when offering these variations in firing times. __________________ "Except for this one, I have come to the conclusion that all generalizations are false" -Jim Hayes
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23rd July 2008, 05:23	#4 (permalink)
snicks RBW Member Current Rebreather/s: Megalodon Other Rebreather/s: Inspiration Classic Join Date: Jul 2006 Location: Germany Posts: 44	Re: meg solenoid firing times I dont see ASP to modify firing times. The off-times are set in the menu and are not influenced by your setpoint (be it ASP or anything from MAN to 1.4). The modification with 2.5 was the "Adaptive Injection Algorithm" which modifies firing duration in dependence "on the rate of response of current PO2 vs. desired PO2". I think that was different with the older APECS versions. Have never changed my solenoid off-time, but Im a noob anyway Greets Dirk __________________ Weltmacht mit drei Buchstaben? ICH!
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23rd July 2008, 18:08	#5 (permalink)
Fun Under Pressure Supporting Member Current Rebreather/s: Megalodon Other Rebreather/s: Inspiration Classic Join Date: Nov 2006 Location: Germany Posts: 805	Re: meg solenoid firing times I think ISC wont prevent O2 spikes on deeper dives. So you can change the pause beetween each solonid fire. I fly my unit manuelly and so don´t need this option at the time, but is nice to have..... __________________ Cheers Markku Meg # 773 Dive my dreams is my life-task
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26th July 2008, 03:57	#6 (permalink)
Padipro Supporting Member Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Nov 2006 Location: South Florida Posts: 252	Re: meg solenoid firing times I don't use the default injection timing with my unit. I have the Jaksa solenoid with the timing set to 1.5 on with 6 seconds between firings. It usually fires twice in order to bring the PO2 up to the set point I've selected but it maintains the set point perfectly. __________________ Scott IANTD Megalodon IANTD Trimix TDI Adv Nitrox and Deco PADI MSDT It could be that the sole purpose of your life is only to serve as a warning to others. Before you attempt to beat the odds, be sure you could survive the odds beating you.
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