sensor linearity on HH

zmcave · 11th July 2006, 21:10

Hi guys,

so, after the first weekend of diving with my new Optima everything is looking almost good. The unit performed well but I had a little bit of buoyancy issues sunday when in shalow sea water (surge, etc). I liked it better when diving saturday on the quarry and in fresh water...
One issue though... The HH rebooted u/w on saturday at the end of the dive when I was doing my safety stop (some 80' in water). On the second day I went for a local reef, first to some 15 meters (45') and everything went fine. After that I went for a 5 meter area for the second dive and the unit went off after 30 minutes, since I havent changed batteries (using regular duracell) all weekend I assumed that was it (I wanted to see how long they last). After it died u/w I pressed the buton and it came back for some 5 seconds and off again. I used the same ExtendAir all weekend (almost 3 hour if you add pre-breathing and stuff).
So, lessons so far, duracells last 2 hours on the primary HH, and I guess I really need that conductive grease (I already ordered it and a friend will bring it to me after his CDTC at Padi HQ).

Now, the linearity issue is with my boss optima.
Reading this in mV:

primary air 9 11 9 O2 42 57 43
secondary air 8 12 9 O2 41 57 43

Is sensor #2 off the expected linearity?
Should he change it?

thank you,

Zé.

Tecdiverfl · 12th July 2006, 00:03

Don't assume its the batteries. Mine is back at Jurgensen for the same problem. You should not have a problem doing a total of 3 hours on a set of new batteries.

***ScubaDadMiami*** · 12th July 2006, 00:18

I get anywhere from lower 40s to about 53 with O2, and about the same as you on air.

The alkaline batteries are said to be good for about as long as a catridge. When I use those, I change them everyday or whenever I change the cartridge, whichever comes first.

sensor330 · 12th July 2006, 00:46

Quote: (Originally Posted by zmcave)

Hi guys,

so, after the first weekend of diving with my new Optima everything is looking almost good. The unit performed well but I had a little bit of buoyancy issues sunday when in shalow sea water (surge, etc). I liked it better when diving saturday on the quarry and in fresh water...
One issue though... The HH rebooted u/w on saturday at the end of the dive when I was doing my safety stop (some 80' in water). On the second day I went for a local reef, first to some 15 meters (45') and everything went fine. After that I went for a 5 meter area for the second dive and the unit went off after 30 minutes, since I havent changed batteries (using regular duracell) all weekend I assumed that was it (I wanted to see how long they last). After it died u/w I pressed the buton and it came back for some 5 seconds and off again. I used the same ExtendAir all weekend (almost 3 hour if you add pre-breathing and stuff).
So, lessons so far, duracells last 2 hours on the primary HH, and I guess I really need that conductive grease (I already ordered it and a friend will bring it to me after his CDTC at Padi HQ).

Now, the linearity issue is with my boss optima.
Reading this in mV:

primary air 9 11 9 O2 42 57 43
secondary air 8 12 9 O2 41 57 43

Is sensor #2 off the expected linearity?
Should he change it?

thank you,

Zé.

I've had this problem before and found that:

a) the cap need to be needs to be screwed down really frigging tight;
b) the cap and connections need to be cleaned on a regular basis; and
c) it helps if you file the threads on the cap.

As far as your linearity it's normal. Check your cells on the meter that rounds to three decimal points and and you'll probably discover that sensor 2 is very close, and if you switch the meter to two decimal point it will probably round up.

Scott

***jradomski*** · 12th July 2006, 04:44

Quote: (Originally Posted by zmcave)

Hi guys,

so, after the first weekend of diving with my new Optima everything is looking almost good. The unit performed well but I had a little bit of buoyancy issues sunday when in shalow sea water (surge, etc). I liked it better when diving saturday on the quarry and in fresh water...
One issue though... The HH rebooted u/w on saturday at the end of the dive when I was doing my safety stop (some 80' in water). On the second day I went for a local reef, first to some 15 meters (45') and everything went fine. After that I went for a 5 meter area for the second dive and the unit went off after 30 minutes, since I havent changed batteries (using regular duracell) all weekend I assumed that was it (I wanted to see how long they last). After it died u/w I pressed the buton and it came back for some 5 seconds and off again. I used the same ExtendAir all weekend (almost 3 hour if you add pre-breathing and stuff).
So, lessons so far, duracells last 2 hours on the primary HH, and I guess I really need that conductive grease (I already ordered it and a friend will bring it to me after his CDTC at Padi HQ).

Now, the linearity issue is with my boss optima.
Reading this in mV:

primary air 9 11 9 O2 42 57 43
secondary air 8 12 9 O2 41 57 43

Is sensor #2 off the expected linearity?
Should he change it?

thank you,

Zé.

should get more than 2 hours on a set of batteries unless you put them in sometime before use.. for an endurance trial I put my alkaline batteries in a week before I was going to dive them.. I did 6 hours of pool work with a student this weekend and the batteries were still operating fine.. (i changed them for ow as a precaution)

Flatten the threads slightly with a pair of pliers.. make sure the cap and socket is clean... check the batteries before use under lload.. not all "new" batteries are good..

paulraymaekers · 12th July 2006, 10:45

Quote: (Originally Posted by zmcave)

primary air 9 11 9 O2 42 57 43
secondary air 8 12 9 O2 41 57 43

Is sensor #2 off the expected linearity?
Should he change it?
.

hello Zen nothing wrong here with your HH, just cell 2 is a strong one, cell 1 and 3 are weaker ones..

clean the treadh of the cap and tight it down correctly, than no problem with the batt anymore

regards
paul

MikeH · 14th July 2006, 02:57

Quote: (Originally Posted by zmcave)

Now, the linearity issue is with my boss optima.
Reading this in mV:

primary air 9 11 9 O2 42 57 43
secondary air 8 12 9 O2 41 57 43

Is sensor #2 off the expected linearity?
Should he change it?

Take your readings in air and multiply them by 4.78 to get the expected reading in O2. Your sensors seem to be good to me based on those numbers. It would be easier to tell for sure if you had the exact numbers, including decimal points....but they look good based on what you posted.

Mike

zmcave · 14th July 2006, 05:17

thanks for the tips guys.
Zé.

11th July 2006, 21:10	#1 (permalink)
zmcave www.rebreather.com.br Current Rebreather/s: Optima Dolphin Other Rebreather/s: Optima Dolphin Join Date: Apr 2006 Location: Brazil Posts: 186	sensor linearity on HH Hi guys, so, after the first weekend of diving with my new Optima everything is looking almost good. The unit performed well but I had a little bit of buoyancy issues sunday when in shalow sea water (surge, etc). I liked it better when diving saturday on the quarry and in fresh water... One issue though... The HH rebooted u/w on saturday at the end of the dive when I was doing my safety stop (some 80' in water). On the second day I went for a local reef, first to some 15 meters (45') and everything went fine. After that I went for a 5 meter area for the second dive and the unit went off after 30 minutes, since I havent changed batteries (using regular duracell) all weekend I assumed that was it (I wanted to see how long they last). After it died u/w I pressed the buton and it came back for some 5 seconds and off again. I used the same ExtendAir all weekend (almost 3 hour if you add pre-breathing and stuff). So, lessons so far, duracells last 2 hours on the primary HH, and I guess I really need that conductive grease (I already ordered it and a friend will bring it to me after his CDTC at Padi HQ). Now, the linearity issue is with my boss optima. Reading this in mV: primary air 9 11 9 O2 42 57 43 secondary air 8 12 9 O2 41 57 43 Is sensor #2 off the expected linearity? Should he change it? thank you, Zé.
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12th July 2006, 00:03	#2 (permalink)
Tecdiverfl New Member Current Rebreather/s: Optima Other Rebreather/s: Join Date: Oct 2005 Location: Delray Beach, FL Posts: 70	Re: sensor linearity on HH Don't assume its the batteries. Mine is back at Jurgensen for the same problem. You should not have a problem doing a total of 3 hours on a set of new batteries.
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12th July 2006, 00:18	#3 (permalink)
*ScubaDadMiami* Moderator Current Rebreather/s: Optima Other Rebreather/s: Join Date: Sep 2005 Location: Florida, USA Posts: 2,130	Re: sensor linearity on HH I get anywhere from lower 40s to about 53 with O2, and about the same as you on air. The alkaline batteries are said to be good for about as long as a catridge. When I use those, I change them everyday or whenever I change the cartridge, whichever comes first. __________________ Howard Packer IANTD CCR Instructor Miami Beach, Florida CCRDiveTraining.com
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12th July 2006, 00:46	#4 (permalink)
sensor330 Custom Title Allowed! Current Rebreather/s: Megalodon Other Rebreather/s: Not Bought Yet Inspiration Classic Join Date: Feb 2005 Location: Victoria, British Columbia, Canada Posts: 583	Re: sensor linearity on HH Quote: (Originally Posted by zmcave) Hi guys, so, after the first weekend of diving with my new Optima everything is looking almost good. The unit performed well but I had a little bit of buoyancy issues sunday when in shalow sea water (surge, etc). I liked it better when diving saturday on the quarry and in fresh water... One issue though... The HH rebooted u/w on saturday at the end of the dive when I was doing my safety stop (some 80' in water). On the second day I went for a local reef, first to some 15 meters (45') and everything went fine. After that I went for a 5 meter area for the second dive and the unit went off after 30 minutes, since I havent changed batteries (using regular duracell) all weekend I assumed that was it (I wanted to see how long they last). After it died u/w I pressed the buton and it came back for some 5 seconds and off again. I used the same ExtendAir all weekend (almost 3 hour if you add pre-breathing and stuff). So, lessons so far, duracells last 2 hours on the primary HH, and I guess I really need that conductive grease (I already ordered it and a friend will bring it to me after his CDTC at Padi HQ). Now, the linearity issue is with my boss optima. Reading this in mV: primary air 9 11 9 O2 42 57 43 secondary air 8 12 9 O2 41 57 43 Is sensor #2 off the expected linearity? Should he change it? thank you, Zé. I've had this problem before and found that: a) the cap need to be needs to be screwed down really frigging tight; b) the cap and connections need to be cleaned on a regular basis; and c) it helps if you file the threads on the cap. As far as your linearity it's normal. Check your cells on the meter that rounds to three decimal points and and you'll probably discover that sensor 2 is very close, and if you switch the meter to two decimal point it will probably round up. Scott
(Offline)

12th July 2006, 04:44	#5 (permalink)
*jradomski* Moderator Current Rebreather/s: Inspiration Classic Sport Kiss Optima rEvo Other CCR Home Build Other Rebreather/s: Inspiration Vision Evolution Megalodon Classic Kiss rEvo Other CCR Home Build Join Date: Mar 2005 Location: "Da" Bronx Posts: 3,001	Re: sensor linearity on HH Quote: (Originally Posted by zmcave) Hi guys, so, after the first weekend of diving with my new Optima everything is looking almost good. The unit performed well but I had a little bit of buoyancy issues sunday when in shalow sea water (surge, etc). I liked it better when diving saturday on the quarry and in fresh water... One issue though... The HH rebooted u/w on saturday at the end of the dive when I was doing my safety stop (some 80' in water). On the second day I went for a local reef, first to some 15 meters (45') and everything went fine. After that I went for a 5 meter area for the second dive and the unit went off after 30 minutes, since I havent changed batteries (using regular duracell) all weekend I assumed that was it (I wanted to see how long they last). After it died u/w I pressed the buton and it came back for some 5 seconds and off again. I used the same ExtendAir all weekend (almost 3 hour if you add pre-breathing and stuff). So, lessons so far, duracells last 2 hours on the primary HH, and I guess I really need that conductive grease (I already ordered it and a friend will bring it to me after his CDTC at Padi HQ). Now, the linearity issue is with my boss optima. Reading this in mV: primary air 9 11 9 O2 42 57 43 secondary air 8 12 9 O2 41 57 43 Is sensor #2 off the expected linearity? Should he change it? thank you, Zé. should get more than 2 hours on a set of batteries unless you put them in sometime before use.. for an endurance trial I put my alkaline batteries in a week before I was going to dive them.. I did 6 hours of pool work with a student this weekend and the batteries were still operating fine.. (i changed them for ow as a precaution) Flatten the threads slightly with a pair of pliers.. make sure the cap and socket is clean... check the batteries before use under lload.. not all "new" batteries are good.. __________________ Joe Radomski CCR Trimix Instructor Trainer ANDI Instructor Trainer Director #10 All posts are personal opinions and DO NOT reflect any affiliated agency unless specifically stated.
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12th July 2006, 10:45	#6 (permalink)
paulraymaekers rEvo's daddy Current Rebreather/s: rEvo Other CCR Home Build Other Rebreather/s: rEvo Other CCR Home Build Join Date: May 2005 Location: belgium Posts: 1,494	Re: sensor linearity on HH Quote: (Originally Posted by zmcave) primary air 9 11 9 O2 42 57 43 secondary air 8 12 9 O2 41 57 43 Is sensor #2 off the expected linearity? Should he change it? . hello Zen nothing wrong here with your HH, just cell 2 is a strong one, cell 1 and 3 are weaker ones.. clean the treadh of the cap and tight it down correctly, than no problem with the batt anymore regards paul __________________ www.rEvo-rebreathers.com .... the earth is flat, Elvis is alive, and radial scrubbers give longer dwell time than axials...
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14th July 2006, 02:57	#7 (permalink)
MikeH Custom Title Allowed! Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Aug 2005 Location: Orlando, FL USA Posts: 178	Re: sensor linearity on HH Quote: (Originally Posted by zmcave) Now, the linearity issue is with my boss optima. Reading this in mV: primary air 9 11 9 O2 42 57 43 secondary air 8 12 9 O2 41 57 43 Is sensor #2 off the expected linearity? Should he change it? Take your readings in air and multiply them by 4.78 to get the expected reading in O2. Your sensors seem to be good to me based on those numbers. It would be easier to tell for sure if you had the exact numbers, including decimal points....but they look good based on what you posted. Mike
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14th July 2006, 05:17	#8 (permalink)
zmcave www.rebreather.com.br Current Rebreather/s: Optima Dolphin Other Rebreather/s: Optima Dolphin Join Date: Apr 2006 Location: Brazil Posts: 186	Re: sensor linearity on HH thanks for the tips guys. Zé.
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