[PSUBS-MAILIST] Depth Sounder

Fri Mar 26 04:20:51 EDT 2021

 Jon, I have suggested using a shoot-through Hull transducer in the past. You can shoot through up to 1/2". There needs to be no air gap between the transducer & the fiberglass Hull, or in our case fiberglass port hole. You could also pot around a shoot through Hull transducer up to 1/2" thick & leave it external.Alan 
    On Friday, March 26, 2021, 03:02:53 PM GMT+13, Jon Wallace via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  

  So I assume you found some way to waterproof the DST800 transducer.  Can you give any details?  Photos?  I called AIRMAR today and talked to one of their technicians who was very helpful but he suggested a "in-hull" unit P79-235-0 because he was emphatic that the transducer would not survive submerged and did not think it could be potted effectively.  His suggestion was to use the "in-hull" model and shoot through plexiglas window.  Essentially, building a 1-ATM housing for it.  I'd rather not do that if the AIRMAR units will survive the depth.
Jon

    On Thursday, March 25, 2021, 07:22:36 PM EDT, Cliff Redus via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  

  Jon on the R300, I use the Airmar DST800 DST800 Smart™ Sensor | AIRMAR I interface it with my PLC via RS232 and parse the NEMA 0183 ASCII strings to get altitude, speed and temperature.  I have been happy with this transponder for the most part.  What I don't like about it is the 70m depth limit.  On many occasions when doing a surface transit I have been in deeper water than this and the meter pegs out.  
I founds interfacing with NEMA 0183 devices straightforward.
The R800 I am designing has a design depth of 800 ft.  As such I need a deeper sounder.  Because I like the NEMA 0183 devices and the fact I am going to use a RS232 channel on the new boat for altitude, I have speced a new transponder. It is the CruzPro ATU120BT CruzPro ATU120BT: 300 Mt plastic feed-through transducer (marinepanservice.com)

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CruzPro ATU120BT: 300 Mt plastic feed-through transducer

CruzPro ATU120BT plastic active feed-through transducer, with temperature, depth 300 Mt, power 320 watt RMS, DSP...
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This gets me 300m or 984 ft so more than enough for new boat.  The cost for the unit is $260.  While these transponders are for surface boats, I am hoping that it is solid and can withstand the depth.  At some point I plan on doing some depth test in my test chamber to see if it will withstand the pressure.  I found some nice altitude sensors for ROVs but I found that the prices are a magnitude higher.
I think Hank has been happy with his altitude sounder.  I don't remember what he using but you might want to send him and note and see what he used on Gamma and the E3000.
Cliff

    On Thursday, March 25, 2021, 09:06:37 AM CDT, Jon Wallace via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  

 Cliff, what manufacturer/model sounder are you using for altitude?  Do you have it interfaced with your computer or is it a separate unit?  I'm looking at NMEA sounders which are relatively easy to interface with microprocessors but are expensive.  Analog depth sounding transducers are much cheaper but I don't know how they present their information.
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