[PSUBS-MAILIST] Lake quality sensors

Sun Jul 15 15:24:34 EDT 2018

Blue Robotics items are not compatible for use in USA waters, Alan...celsius, bars, etc.  :) :)  Nice housings for their units, I really like those.  Had I known about these things back when I was fabricating my own I wouldn't have bothered.  Pretty sure I've got close to $50 in my LM34 unit and it doesn't look a bit cool compared to the Blue Robotics items.
Jon
      From: Alan via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Sunday, July 15, 2018 5:56 AM
 Subject: Re: [PSUBS-MAILIST] Lake quality sensors

Great video Jon.You look like you are doing the same as me, taking the long route &building everything.I don't know how critical the potting is in this case but I once pottedwires out of a linear actuator like you did, then filled the actuator upwith WD40. It just ran out between the pvc & resin like magic with nopressure at all applied.On my light build I stripped a section of the wire that went through the epoxy,epoxied it & then went over the outside of the fitting & wiring with a 3M2 part heat activated pvc glue. I went an inch up the wiring with this asthis is how I noted they did it with vulcanising on underwater connectors.I experimented with all sorts of glues & then went to an inflatable boatmanufacturer who put me on to the 3M product. Over this I moulded polyeurathane, but mainly as strain relief & aesthetics. It tested ok to 2000ft.BTW Blue Robotics are selling temperature sensors for about $50-https://www.bluerobotics.com/store/electronics/celsius-sensor-r1/Cheers Alan 

Sent from my iPad
On 15/07/2018, at 12:56 AM, Jon Wallace via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

I documented encapsulating an LM34 temperature sensor which might interest you.  You can get the sensor at digikey, mouser, or any other similar distributor. 

https://youtu.be/-1iAJcph0Js

--------------------------------------------
On Fri, 7/13/18, Mark via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Subject: [PSUBS-MAILIST] Lake quality sensors
 To: "Psubs" <Personal_Submersibles at psubs.org>
 Date: Friday, July 13, 2018, 9:34 PM

 Good afternoon, team psubs:

 This year we are planning to give our
 sub purpose.  We live on a small lake in North Carolina
 where the lake depth averages between 20 and 30 feet. 
 Our plan is to outfit the sub with sensors (and data
 acquisition) to measure the lake water quality such as pH,
 Dissolved Oxygen, Turbidity, Nitrogen, Total Coliform,
 E-Coli, Temperature, etc.

 Has anyone done this before?  Does
 anyone have information where I could purchase these
 sensors?

 Regards,

 Mark Widman
 910-638-5229

 Sent from iPhone.

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