Uwatec Aladin Pro & Suunto Vyper variation in depth

Red Sea Shadow

Contributor

Scuba Instructor

Messages

2,580

Reaction score

87

• Jul 9, 2008

• #1

I have an old Uwatec Aladin Pro (1994) and a fairly new Suunto Vyper (2005). It happens that I was using the two computers in one dive and there was around 1.5m variation in depth between their readings. For example, the Uwatec reads 20m and the Suunto reads 21.5m. Almost all the others had Suuntos (Vyper and Spider) and all read the same as my Suunto.

Any idea?

 

ApexLongimanus

Contributor

Scuba Instructor

Divemaster

Messages

347

Reaction score

2

Location

Norwalk, CT

• Jul 9, 2008

• #2

the uwatecs are calibrated for fresh water, the suuntos not.
i.e. diving in salt water, the uwatec will show a deeper depth (=conservative). taking the suunto into fresh water, it will not show you a shallower depth than you actually are; so you should adjust your dive planning if need be.

reason is that uwatec were developed in switzerland where diving is done primarily in lakes.

 

OP

Red Sea Shadow

Contributor

Scuba Instructor

Messages

2,580

Reaction score

87

• Jul 9, 2008

• #3

Thanks for your reply.

What happened was the opposite! The Suunto read deeper than the Uwatec! The diving was done in salt water.

 

ApexLongimanus

Contributor

Scuba Instructor

Divemaster

Messages

347

Reaction score

2

Location

Norwalk, CT

• Jul 9, 2008

• #4

that is strange. seems one of them is not calibrated correctly.

 

OP

Red Sea Shadow

Contributor

Scuba Instructor

Messages

2,580

Reaction score

87

• Jul 9, 2008

• #5

Do you think the accuracy deteriorates with time?

 

ApexLongimanus

Contributor

Scuba Instructor

Divemaster

Messages

347

Reaction score

2

Location

Norwalk, CT

• Jul 9, 2008

• #6

i don't think so, but have to admit that i don't know. never heard anything in that regard, though.
can you borrow a third one and compare on a dive? that should give you an idea as to which one is the faulty one (keeping in mind the uwatec calibration for fresh water). then i would contact the respective manufacturer.

 

OP

Red Sea Shadow

Contributor

Scuba Instructor

Messages

2,580

Reaction score

87

• Jul 9, 2008

• #7

Already did. An Oceanic gave the same readings of the Suunto. It's obvious that the Uwatec is the faulty one.

 

N

NiclasG

Registered

Messages

54

Reaction score

0

• Jul 11, 2008

• #8

Accuracy gets worse with time, this is normal. In principle you correct offset and span, at least Uwatec allows for this correction. You need a service tool to do it.

Niclas
(worked for in the business many years ago)

 

OP

Red Sea Shadow

Contributor

Scuba Instructor

Messages

2,580

Reaction score

87

• Jul 11, 2008

• #9

NiclasG:

Accuracy gets worse with time, this is normal. In principle you correct offset and span, at least Uwatec allows for this correction. You need a service tool to do it.

Niclas
(worked for in the business many years ago)

Click to expand...

Thanks

How do you do so? It's the gray old model. The only thing that could be disassembled is the battery.

BTW, the battery was just changed. Could that be the reason behind accuracy problems?

 

N

NiclasG

Registered

Messages

54

Reaction score

0

• Jul 14, 2008

• #10

You need a service tool(software) to do it. Ask an Uwatec service to have a look on it.

Niclas