<html><head></head><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px"><div id="yui_3_16_0_ym19_1_1477944393544_2870"><span id="yui_3_16_0_ym19_1_1477944393544_2989">Thanks Cliff,</span></div><div id="yui_3_16_0_ym19_1_1477944393544_2931"><span id="yui_3_16_0_ym19_1_1477944393544_2930">I am having 2 independent O2 systems & 2 air supply systems.</span></div><div id="yui_3_16_0_ym19_1_1477944393544_2967"><span id="yui_3_16_0_ym19_1_1477944393544_2968">Only low pressure air going in to the hull, with a cross over valve</span></div><div id="yui_3_16_0_ym19_1_1477944393544_2970"><span id="yui_3_16_0_ym19_1_1477944393544_2969">for the ballast air. Also doing 3 or 4 days O2 supply. So although</span></div><div id="yui_3_16_0_ym19_1_1477944393544_2977" dir="ltr"><span id="yui_3_16_0_ym19_1_1477944393544_2988">it wouldn't be ideal having a wrong pressure reading, it wouldn't</span></div><div id="yui_3_16_0_ym19_1_1477944393544_3019" dir="ltr"><span>be fatal. </span></div><div id="yui_3_16_0_ym19_1_1477944393544_3058" dir="ltr"><span id="yui_3_16_0_ym19_1_1477944393544_3057">I like all that you are doing in that system & thanks for the details.</span></div><div id="yui_3_16_0_ym19_1_1477944393544_3098" dir="ltr"><span id="yui_3_16_0_ym19_1_1477944393544_3097">BTY did you see the new LED I am playing around with?</span></div><div id="yui_3_16_0_ym19_1_1477944393544_3102" dir="ltr"><span id="yui_3_16_0_ym19_1_1477944393544_3101">80W Flip chip that dissipates heat faster from the individual LEDs &</span></div><div id="yui_3_16_0_ym19_1_1477944393544_3100" dir="ltr"><span id="yui_3_16_0_ym19_1_1477944393544_3099">is a round, smaller unit than normal. It will mean I can get away with</span></div><div id="yui_3_16_0_ym19_1_1477944393544_3158" dir="ltr"><span id="yui_3_16_0_ym19_1_1477944393544_3159">a smaller lens; the lens being the most expensive part.</span></div><div id="yui_3_16_0_ym19_1_1477944393544_3186" dir="ltr"><span>Have just ordered 15 samples from the manufacturer (who makes the</span></div><div id="yui_3_16_0_ym19_1_1477944393544_3187" dir="ltr"><span>Bridgelux) at $6.50 each.</span></div><div id="yui_3_16_0_ym19_1_1477944393544_3203" dir="ltr"><span>Alan</span></div><div id="yui_3_16_0_ym19_1_1477944393544_3222" dir="ltr"><span></span> </div><div class="qtdSeparateBR" id="yui_3_16_0_ym19_1_1477944393544_2871"><br><br></div><div class="yahoo_quoted" id="yui_3_16_0_ym19_1_1477944393544_2928" style="display: block;"> <div id="yui_3_16_0_ym19_1_1477944393544_2927" style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div id="yui_3_16_0_ym19_1_1477944393544_2926" style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div id="yui_3_16_0_ym19_1_1477944393544_2925" dir="ltr"> <font id="yui_3_16_0_ym19_1_1477944393544_2936" face="Arial" size="2"> <hr size="1" id="yui_3_16_0_ym19_1_1477944393544_2992"> <b id="yui_3_16_0_ym19_1_1477944393544_3110"><span id="yui_3_16_0_ym19_1_1477944393544_3109" style="font-weight: bold;">From:</span></b> Cliff Redus via Personal_Submersibles <personal_submersibles@psubs.org><br> <b><span style="font-weight: bold;">To:</span></b> Personal Submersibles General Discussion <personal_submersibles@psubs.org> <br> <b><span style="font-weight: bold;">Sent:</span></b> Tuesday, November 1, 2016 4:00 AM<br> <b id="yui_3_16_0_ym19_1_1477944393544_2938"><span id="yui_3_16_0_ym19_1_1477944393544_2937" style="font-weight: bold;">Subject:</span></b> Re: [PSUBS-MAILIST] Electronics contents gauge<br> </font> </div> <div class="y_msg_container" id="yui_3_16_0_ym19_1_1477944393544_3023"><br><div id="yiv7030969494"><div id="yui_3_16_0_ym19_1_1477944393544_3022"><div id="yui_3_16_0_ym19_1_1477944393544_3021" dir="ltr"><div id="yui_3_16_0_ym19_1_1477944393544_3020">Alan, I agree 100% with Emile on this. Given the safety implications of not knowing the air pressure in external air tanks, this needs to be a rock solid measurement. On my boat, for the HP air pressure, I use a 1/4 MNPT sensor with a 1-5 vdc analog output screwed into a 316L SS penetrator that has a 1/4 FNPT thread on the interior side and ANSI 7/16-20 UNF thread on the exterior. I use a Swagelok fitting PN SS-400-1-OR that lands in the penetrator and uses a o-ring face seal. This fitting converts to 1/4" tube which I use for all HP air line. 1/4NPT gage pressure sensors are always available on Ebay with either analog voltage output or analog current output. This sensor wires directly into PLC analog input module. PLC ladder logic can then implement low pressure alarms and interlocks to prevent diving when air pressure is low or someone forgets to turn on HP air valve.</div><div id="yui_3_16_0_ym19_1_1477944393544_3028"><br clear="none"></div><div>Cliff</div></div><div class="yiv7030969494gmail_extra"><br clear="none"><div class="yiv7030969494gmail_quote">On Sun, Oct 30, 2016 at 3:19 PM, emile via Personal_Submersibles <span dir="ltr"><<a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>></span> wrote:<br clear="none"><blockquote class="yiv7030969494gmail_quote" style="margin: 0px 0px 0px 0.8ex; padding-left: 1ex; border-left-color: rgb(204, 204, 204); border-left-width: 1px; border-left-style: solid;"><div class="yiv7030969494yqt6457292713" id="yiv7030969494yqt07289"><div lang="NL"><div class="yiv7030969494m_4753070946621159571WordSection1"><div class="yiv7030969494MsoNormal"><span lang="EN-US" style="color: rgb(31, 73, 125);">The scuba pressure sensors are wireless. Most scuba divers don’t want it as it is unreliable.<u></u><u></u></span></div><div class="yiv7030969494MsoNormal"><span lang="EN-US" style="color: rgb(31, 73, 125);"><u></u> <u></u></span></div><div class="yiv7030969494MsoNormal"><span lang="EN-US" style="color: rgb(31, 73, 125);">Best would be to screw a industrial pressure sensor (with ¼ “thread or so) into the penetrator plate and attach a HP line on the outside.<u></u><u></u></span></div><div class="yiv7030969494MsoNormal"><span lang="EN-US" style="color: rgb(31, 73, 125);"><u></u> <u></u></span></div><div class="yiv7030969494MsoNormal"><span lang="EN-US" style="color: rgb(31, 73, 125);"><u></u> <u></u></span></div><div class="yiv7030969494MsoNormal"><span lang="EN-US" style="color: rgb(31, 73, 125);">Br, Emile<u></u><u></u></span></div><div class="yiv7030969494MsoNormal"><span lang="EN-US" style="color: rgb(31, 73, 125);"><u></u> <u></u></span></div><div><div style="border-width: 1pt medium medium; border-style: solid none none; border-color: rgb(181, 196, 223) currentColor currentColor; padding: 3pt 0cm 0cm;"><div class="yiv7030969494MsoNormal"><b><span>Van:</span></b><span> Personal_Submersibles [mailto:<a href="mailto:personal_submersibles-bounces@psubs.org" target="_blank" rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles-bounces@psubs.org">personal_submersibles- bounces@psubs.org</a>] <b>Namens </b>Alan James via Personal_Submersibles<br clear="none"><b>Verzonden:</b> zondag 30 oktober 2016 21:02<br clear="none"><b>Aan:</b> Personal Submersibles General Discussion<br clear="none"><b>Onderwerp:</b> [PSUBS-MAILIST] Electronics contents gauge<u></u><u></u></span></div></div></div><div class="yiv7030969494MsoNormal"><u></u> <u></u></div><div><div><div class="yiv7030969494MsoNormal" style="background: white;"><span style="color: black;">Is there a suitable electronic scuba tank contents gauge out there?<u></u><u></u></span></div></div><div id="yiv7030969494m_4753070946621159571yui_3_16_0_ym19_1_1477856450518_3670"><div class="yiv7030969494MsoNormal" style="background: white;"><span style="color: black;">I am after something that plugs in to the high pressure port of the<u></u><u></u></span></div></div><div id="yiv7030969494m_4753070946621159571yui_3_16_0_ym19_1_1477856450518_3669"><div class="yiv7030969494MsoNormal" style="background: white;"><span style="color: black;">1st stage regulator & has wires off it that I can run through a through<u></u><u></u></span></div></div><div id="yiv7030969494m_4753070946621159571yui_3_16_0_ym19_1_1477856450518_3668"><div class="yiv7030969494MsoNormal" style="background: white;"><span style="color: black;">hull so I can display the tank contents pressure on a screen.<u></u><u></u></span></div></div><div id="yiv7030969494m_4753070946621159571yui_3_16_0_ym19_1_1477856450518_3667"><div class="yiv7030969494MsoNormal" style="background: white;"><span style="color: black;">Trying to avoid bringing high pressure in to the hull.<u></u><u></u></span></div></div><div id="yiv7030969494m_4753070946621159571yui_3_16_0_ym19_1_1477856450518_3641"><div class="yiv7030969494MsoNormal" style="background: white;"><span style="color: black;">An alternative may be to run a high pressure line to a through<u></u><u></u></span></div></div><div id="yiv7030969494m_4753070946621159571yui_3_16_0_ym19_1_1477856450518_3642"><div class="yiv7030969494MsoNormal" style="background: white;"><span style="color: black;">hull & have an electronic pressure gauge threaded in to this from the <u></u><u></u></span></div></div><div id="yiv7030969494m_4753070946621159571yui_3_16_0_ym19_1_1477856450518_3666"><div class="yiv7030969494MsoNormal" style="background: white;"><span style="color: black;">inside of the hull. However with the second method, I wouldn't have<u></u><u></u></span></div></div><div id="yiv7030969494m_4753070946621159571yui_3_16_0_ym19_1_1477856450518_3707"><div class="yiv7030969494MsoNormal" style="background: white;"><span style="color: black;">a shut off valve if the pressure gauge failed some how.<u></u><u></u></span></div></div><div id="yiv7030969494m_4753070946621159571yui_3_16_0_ym19_1_1477856450518_3706"><div class="yiv7030969494MsoNormal" style="background: white;"><span style="color: black;">Alan<u></u><u></u></span></div></div><div id="yiv7030969494m_4753070946621159571yui_3_16_0_ym19_1_1477856450518_3665"><div class="yiv7030969494MsoNormal" style="background: white;"><span style="color: black;"><br clear="none"> <u></u><u></u></span></div></div></div></div></div></div><br clear="none">______________________________ _________________<br clear="none">
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