[PSUBS-MAILIST] (no subject)

[Alec Smyth via Personal_Submersibles]

Hah, I *knew* you'd come up with something like that! It's funny how each
person here is either an Arduino person, a PLC person, etc. They all work.

Alec

On Tue, Nov 15, 2022 at 8:07 AM hank pronk via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Hi guys, thanks for the input.  I will take it as a compliment that you
> think I can manage these electronic solutions.
> I will opt for a more simple system.  I ordered a compressor pressure
> switch.  I will modify the low pressure setting.   The switch will activate
> a small solenoid to fill the chamber to 175 psi.  The chamber will have a
> bleed valve that is constantly bleeding very slowly.  Once the pressure
> drops to near zero, the switch will tell the solenoid to fill the chamber
> again.  We can time the cycle, and walk away for a month.
> Hank
>
> Sent from my iPhone
>
> On Nov 13, 2022, at 8:33 PM, Cliff Redus via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> 
> Hank,
>
> I would use a direct acting cartridge style proportional pressures
> reducing valve, something like a Hydraforce EHPR08-33X Hydraforce |
> Pressure Rising with Current - EHPR08-33
> <https://www.hydraforce.com/products/valves/electro-proportional-controls/ehpr08-33/>.
> These are installed in a small aluminum manifold in which you connect
> hydraulic tubing with Swagelok fittings.  These valves let you specify a
> control signal, usually 4-20mA.  They then can be used to automatically
> hold the pressure and any level between zero and the maximum your pressure
> supply can make.  You then use a small inexpensive PLC like the Automation
> Direct Click PLC CLICK (Stackable Micro Brick PLC) | AutomationDirect
> <https://www.automationdirect.com/adc/overview/catalog/programmable_controllers/click_plcs_(stackable_micro_brick)> along
> with pressure transducer and an inexpensive small touch screen display.
>  Again, you can get these from Automationdirect. You would also need to
> install in the PLC an analog current output that will would be connected to
> the proportional pressure regulator. You then program the PLC with your
> laptop with some simple ladder logic that sends the control current to the
> proportional pressure regulator to step through the pressures you want the
> test chamber to see over time.  Most of these small PLC's have data logging
> capability so you can log test chamber pressure as a function of time.  If
> you also installed a contactor on the power to the pressure supply, the PLC
> could be programed to shut down the system if the viewport failed based on
> the measured test chamber pressure dropping to zero.
>
> CLICK (Stackable Micro Brick PLC) | AutomationDirect
>
> Save on CLICK Series Programmable Logic Controllers at AutomationDirect,
> your source for Click PLCs at low price...
>
> <https://www.automationdirect.com/adc/overview/catalog/programmable_controllers/click_plcs_(stackable_micro_brick)>
>
>
>
> These proportional pressures reducing valve could also be run with a
> microprocessor like Jon uses and setup in a similar way.
>
> Best
>
> Hydraforce | Pressure Rising with Current - EHPR08-33
>
> PROPORTIONAL PRESSURE REDUCING / RELIEVING CARTRIDGE VALVE
>
> <https://www.hydraforce.com/products/valves/electro-proportional-controls/ehpr08-33/>
> .
>
>
>
>
> On Sunday, November 13, 2022 at 09:45:39 AM CST, hank pronk via
> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>
>
> Hi submarine friends.  I just completed a pressure test to failure on our
> Cast Epoxy port.  The port was 1 inch by 8 inches OD.  An acrylic port this
> size is rated to fail at 2,100 feet sea water.  My Epoxy port failed at
> 1,225 psi or 2,744 feet fresh water.
>   Any ideas on how to make a hydraulic apparatus to cycle the port  from
> zero to operating depth in my chamber?
> Hank
> Sent from my iPhone
>
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