Dive computer battery and o-ring spec's

[John in GA]

I believe the later models used two 2032 batteries. Mine uses a J battery and it is a Datamax Pro, circa 1997. My Data Max Sport I purchased new i 1993 has the "non-user replaceable battery". This is not shown in the manual available online from Oceanic but is it is mentioned in the manual that earlier models had non-user replaceable batteries.

John

 

[John in GA]

Here is a phot of the J battery in a Datamax Pro. I believe Oceanic may have inserted an adaptor to use the 2032 batteries.

 

[John in GA]

While we are O-ring size and replacement, has anyone every replaced the button O-rings on any of the early Oceanic puck, or Datmax computers?

 

[tursiops]

I believe the later models used two 2032 batteries. Mine uses a J battery and it is a Datamax Pro, circa 1997. My Data Max Sport I purchased new i 1993 has the "non-user replaceable battery". This is not shown in the manual available online from Oceanic but is it is mentioned in the manual that earlier models had non-user replaceable batteries.

John

The earliest oceanic webpages I can find on the Wayback machine that have the DataMax Pro info are from June 1998, where it says the battery hatch o-ring is oceanic P/N 2.023. Searching Oceanic for that part number, it is the same as the Data Plus battery hatch o-ring, which uses 2x2032, not a J cell.

It appears the U.S. Divers Scan 4 computer is the same as yours, and uses the same battery. Kits of o-ring plus battery are available on eBay and Amazon.
Battery Kit: AquaLung U.S. Divers Scan 4 Dive Computer | eBay
https://www.amazon.com/Battery-AquaLung-U-S-Divers-Computer/dp/B0721LCFQ5

 

[Couv]

Hi @John in GA
Measure the o-ring groove and compare it with a chart such as found here:
O-Ring Size Chart | USA AS568 Standard O-Ring Sizes

Good luck.

Please update this thread with your findings.

Cheers,

Couv

 

[John in GA]

I believe a AS568-141, D70 is likely the correct size. A -142 might also work. While a -143 would exactly match the case dimensions I suspect it will likely be too large. I will get a couple of each later this week and try them.

Cross reference to MS28775-141.

Aircraft Spruce carries the MS O-rings with a 15 year shelf life for less than $2 each.

John

 

[Couv]

I believe a AS568-141, D70 is likely the correct size. A -142 might also work. While a -143 would exactly match the case dimensions I suspect it will likely be too large. I will get a couple of each later this week and try them.

Cross reference to MS28775-141.

Aircraft Spruce carries the MS O-rings with a 15 year shelf life for less than $2 each.

John

-141 seals have a pretty large cross section. Better double check that one. If the ID is correct you probably need something like a -035 or -036

 

[John in GA]

Couv,

Yes, a -141 is a 3/32 cross section. I was a bit surprised to find this large of a cross section O-ring in the computer. The existing O-ring is a 3/32 C.S. and the O-ring groove looks to be designed for a 3/32 O-ring. The depth of the groove pretty much precludes using a smaller cross section.

I am headed out the door now for work. When I get back in a couple of days I will pick up the O-rings I ordered and see how they look.

I'll post an update one way or the other. Hopefully we will have a new data point for the computer O-ring chart.
By the way, have you or anyone else reading this ever replaced any of the button O-rings on some of these old dive computers? It seems like it might be a good preventative step. I just hate to reinvent the wheel, and risk damaging a working computer, if someone else has already figured it out. I looks pretty straight forward. but of course there can always be unexpected complications.

John

 

[Couv]

Looking forward to your update.

By the way, have you or anyone else reading this ever replaced any of the button O-rings on some of these old dive computers? It seems like it might be a good preventative step. I just hate to reinvent the wheel, and risk damaging a working computer, if someone else has already figured it out. I looks pretty straight forward. but of course there can always be unexpected complications. John

I have not replaced any button o-rings. Now that you mention it, because they are dynamic it would seem they would be more prone to failure than the battery door seal. However, I've not seen one fail.

 

[Nuno Moreira]

Does anyone know the specs for the Mares Smart O Ring? Can't seem to find them anywhere.