<html><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_1_1442259311896_8951"><span>Alec,</span></div><div id="yui_3_16_0_1_1442259311896_8951"><span id="yui_3_16_0_1_1442259311896_8995">looks a good gauge; I am tempted to buy one :)</span></div><div id="yui_3_16_0_1_1442259311896_8951"><span id="yui_3_16_0_1_1442259311896_9006">It has an auto shut off after an hour, but this can be disengaged.</span></div><div id="yui_3_16_0_1_1442259311896_8951"><span id="yui_3_16_0_1_1442259311896_9497">The backlight goes out after 2 minutes which may be a nuisance, but as it</span></div><div id="yui_3_16_0_1_1442259311896_8951"><span id="yui_3_16_0_1_1442259311896_9496">works off a small battery I guess this has to happen to preserve them.</span></div><div id="yui_3_16_0_1_1442259311896_8951"><span id="yui_3_16_0_1_1442259311896_9490">I would be interested to see if you think this is going to be a problem.</span></div><div id="yui_3_16_0_1_1442259311896_8951"><span>A solution would be to wire the backlight LED to an external power source</span></div><div id="yui_3_16_0_1_1442259311896_8951" dir="ltr"><span>if you can get at it.</span></div><div id="yui_3_16_0_1_1442259311896_8951" dir="ltr"><span>Cheers Alan</span></div><div id="yui_3_16_0_1_1442259311896_8951" dir="ltr"><span> </span></div><br> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_1_1442259311896_8998"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_1_1442259311896_8997"> <div dir="ltr" id="yui_3_16_0_1_1442259311896_8996"> <hr size="1" id="yui_3_16_0_1_1442259311896_9501"> <font size="2" face="Arial" id="yui_3_16_0_1_1442259311896_9050"> <b><span style="font-weight:bold;">From:</span></b> Alec Smyth 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, September 15, 2015 1:02 AM<br> <b><span style="font-weight: bold;">Subject:</span></b> Re: [PSUBS-MAILIST] Depth Gage<br> </font> </div> <div class="y_msg_container" id="yui_3_16_0_1_1442259311896_9051"><br><div id="yiv3426115321"><div id="yui_3_16_0_1_1442259311896_9054"><div dir="ltr" id="yui_3_16_0_1_1442259311896_9053">Coincidentally I just spent yesterday afternoon selecting one of those. I would normally prefer an analog gauge because I try to minimize electronics to maximize reliability. However, on a 1,000 foot sub the needle would barely move on shallower dives, so digital display is the only way to go. The accuracy of these instruments is measured as a percent of full scale, and a cheap one is accurate to 1% FS. For a thousand foot sub, that means the smallest depth change it could measure is 10 feet - not good! Well, let me rephrase that. I'm fine knowing my depth to within 10 feet, but what I really want to know if whether my depth is increasing or decreasing, and I'd like to know that before I've traveled 10 feet.<div id="yui_3_16_0_1_1442259311896_9052"><br clear="none"></div><div id="yui_3_16_0_1_1442259311896_9356">I settled on the Dwyer DPG-100, because it has this:</div><div id="yui_3_16_0_1_1442259311896_9355"><br clear="none"></div><div id="yui_3_16_0_1_1442259311896_9354">- 0.25% FS accuracy</div><div id="yui_3_16_0_1_1442259311896_9055">- Displays pressure directly in feet of water</div><div id="yui_3_16_0_1_1442259311896_9353">- Wetted elements are 316 SS</div><div id="yui_3_16_0_1_1442259311896_9352">- IP66 enclosure (waterproof to "hose-down" standard)</div><div id="yui_3_16_0_1_1442259311896_9351">- Lighted display</div><div id="yui_3_16_0_1_1442259311896_9056">- Battery powered, so no need to wire it into the sub power (battery life 2000 hrs)</div><div id="yui_3_16_0_1_1442259311896_9350">- Reasonably priced ($185)</div><div id="yui_3_16_0_1_1442259311896_9531"><br clear="none"></div><div id="yui_3_16_0_1_1442259311896_9057">It also records the max depth, hardly a necessity but cool for unmanned depth tests. For testing my K250 I just strapped a dive computer outside, but that wouldn't work for a test to over 1,000 feet.</div><div id="yui_3_16_0_1_1442259311896_9058"><br clear="none"></div><div id="yui_3_16_0_1_1442259311896_9060">Here is a link: <a rel="nofollow" shape="rect" target="_blank" href="https://www.dwyer-inst.com/PDF_files/A_34.pdf" id="yui_3_16_0_1_1442259311896_9059">https://www.dwyer-inst.com/PDF_files/A_34.pdf</a></div><div id="yui_3_16_0_1_1442259311896_9061"><br clear="none"></div><div id="yui_3_16_0_1_1442259311896_9062">If you want to go the Arduino or PLC route with a touch screen and all that, you can step up to the Dwyer DPG-200 because it transmits a process signal. The nice thing compared to the normal pressure transducers is if your Arduino, PLC, or display screen failed, you could still see the depth directly on the gauge. The DPG-200 also has high and low programmable alarms with NC and NO switches, so you could use it for example to automatically turn on your scrubber when going past ten feet, or to wake you up with a klaxon if you are going past your max depth. However, it has cables coming out the back that make it a little less compact, and it needs an external power feed. Dwyer also offers low-cost screens that you can plug the DPG-200 depth gauge into directly without any processor. </div><div id="yui_3_16_0_1_1442259311896_9063"><br clear="none"></div><div id="yui_3_16_0_1_1442259311896_9065"><a rel="nofollow" shape="rect" target="_blank" href="https://www.dwyer-inst.com/PDF_files/A34A_low.pdf" id="yui_3_16_0_1_1442259311896_9064">https://www.dwyer-inst.com/PDF_files/A34A_low.pdf</a></div><div id="yui_3_16_0_1_1442259311896_9066"><br clear="none"></div><div id="yui_3_16_0_1_1442259311896_9186"><br clear="none"></div><div id="yui_3_16_0_1_1442259311896_9067">I opted for the DPG-100 because my focus is on simplicity, but depending on your priorities one or the other of these two should make a good instrument.<br clear="none"></div><div id="yui_3_16_0_1_1442259311896_9068"><br clear="none"></div><div id="yui_3_16_0_1_1442259311896_9069"><br clear="none"></div><div id="yui_3_16_0_1_1442259311896_9070"><br clear="none"></div><div>Best,</div><div><br clear="none">Alec<br clear="none"><div><br clear="none"></div><div> </div></div></div><div class="yiv3426115321gmail_extra"><br clear="none"><div class="yiv3426115321gmail_quote">On Sun, Sep 13, 2015 at 8:56 PM, Jon Wallace via Personal_Submersibles <span dir="ltr"><<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>></span> wrote:<br clear="none"><blockquote class="yiv3426115321gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div class="qtdSeparateBR"><br><br></div><div class="yiv3426115321yqt0613220738" id="yiv3426115321yqt63083"><div>
<div><br clear="none">
SSI technologies P51 family, but Honeywell <a rel="nofollow" shape="rect" target="_blank" href="http://media.digikey.com/Photos/Honeywell%20Micro%20&%20Precision%20Sensors/MLH500PGL01G.jpg" style="font-size:12px;font-family:Arial, Helvetica, sans-serif;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);">MLH500PGL01G</a> is about
the same price and has better accuracy. I use combination of
arduino, raspberry pi, and processing for my project. See
<a rel="nofollow" shape="rect" target="_blank" href="http://www.subdb.info/cgi/database/showvessel/albums/index.cgi?A=1320788990&B=1439139327&C=&D=Submarine%20Environment%20Monitor%20Software">http://www.subdb.info/cgi/database/showvessel/albums/index.cgi?A=1320788990&B=1439139327&C=&D=Submarine%20Environment%20Monitor%20Software</a><br clear="none">
<br clear="none">
Jon<span class="yiv3426115321"><br clear="none">
<br clear="none">
On 9/13/2015 7:35 PM, Christopher Cave via Personal_Submersibles
wrote:<br clear="none">
</span></div><span class="yiv3426115321">
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<div style="color:#000;background-color:#fff;font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px;">
<div><span>I'm looking to buy an
electronic depth gauge. Any suggestions for a brand,
software etc...</span></div>
<div><span><br clear="none">
</span></div>
<div><span>Thanks,</span></div>
<div><span>Christopher </span></div>
<br clear="none">
</div>
</blockquote>
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</div></div>
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