Pressure transducers

[Alessandro Volpi]

Dear Willem,

as far as the subsurface and smtk2ssrf development is concerned I have sent
a message to Salva and to the mailing list on February 28. The program for
importing the SmartTrak dive log works very well, all my comments having
been reported in the cited message.

The only detail I failed to mention is that the gas switch (or tank switch)
events are flawlessly imported by smtk2ssrf and displayed in the dive
profile plot by subsurface.

I would also like to spend some more words about the issue of the pressure
transmitters ... I promise this post will be MY LAST POST about the
subject. I agree with suggestion that such a discussion is not totally
pertinent to the scope of the subsurface mailing list.

I would only add that I have NOT been as LUCKY as you with my UWATEC
pressure transmitters.

This is, according to my experience, the typical life cycle of such devices
:

   1. I buy a new transmitter
   2. For a few dives it work well, albeit with some "SIGNAL LOST" warnings
   on the Galileo display.
   3. The FREQUENCY of such warnings gets higher and higher. Their DURATION
   does the same.
   4. It happens that, sometimes, the transmitter refuses to work for  the
   entire dive.
   5. I replace the battery, although the voltage measurement shows that
   plenty of energy is still stored in the cell ...
   6. No improvement is observed
   7. I go back to point 1. for another cycle

I went through this cycle many times and each time I have paid 250 Euro ...
It is just enough.

Very best regards.

Alessandro


On Thu, Mar 2, 2017 at 6:06 AM, Willem Ferguson <
willemferguson at zoology.up.ac.za> wrote:

> On 01/03/2017 23:47, Alessandro Volpi wrote:
>
>> My knowledge about the technical details of pressure transmitters is
>> quite limited. Nevertheless I think it is worth while to explain why I
>> would like to test some kind of ultrasonic transmitter.
>>
>> My personal experience is limited to UWATEC transmitters; I have been
>> using them since 1998 and I have thus tested at least three generations of
>> such devices. I have also asked  the opinion of some friends of mine about
>> Suunto dive computers and pressure probes.
>>
>> Very best regards.
>>
>>
>> Alessandro
>>
> I have been using a Galileo for more than 250 dives and, although the link
> between sensor and dive computer is not perfect, my setup has been robust
> enough to be classed as reasonably reliable. I have one older generation
> sensor and a more recent generation sensor. I sometimes lose the signal for
> a few seconds but it always comes back soon. My sidemount setup with a
> sensor on each cylinder works pretty well. Although I change to the
> alternate cylinder fairly frequently but at significant longer than 5 min
> intervals (typically within 30 bar of one another, i.e. a 60 bar drop on a
> cylinder, from 30 bar above the other cylinder to 30 below) the system
> works pretty well. Maybe  it is because in sidemount, the dc and sensors
> are not far apart. But even when using a twinset (where I use only 1 sensor
> [on RH twin cylinder and Galileo on RH arm]) it has been reasonably
> reliable. My only failure has been due to a flat battery. On sidemount I
> still have an additional button SPG on each cylinder and on twinset I have
> a fullsize SPG on the LH cylinder. This system has worked very well and has
> been extremely convenient for me for long time now.
>
> Alessandro, If you have any specific issues with your Galileo and
> Subsurface, please raise these so that we can see what can be done about
> them. The Galileo import is reasonably efficient but not perfect by any
> means because there are still several known issues. I need to find the time
> to track down some things in the dive log and converse with Jef about these.
>
> Kind regards,
> willem
> _______________________________________________
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> subsurface at subsurface-divelog.org
> http://lists.subsurface-divelog.org/cgi-bin/mailman/listinfo/subsurface
>
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