<html><head></head><body><div style="color:#000; background-color:#fff; font-family:times new roman, new york, times, serif;font-size:16px"><div id="yui_3_16_0_ym19_1_1522152967658_6930"><span></span></div><div id="yui_3_16_0_ym19_1_1522152967658_6930" dir="ltr"><span id="yui_3_16_0_ym19_1_1522152967658_7212">A board mount with screw driver access would probably be best, but it looks like OxyCheq sells a ten-turn pot for the kit. The issue James enunciated is almost certainly with the potentiometer not being sensitive enough because even my $1100 Analox uses the same type gas sensor as El Cheapo and other rebreather analyzers. It's all in the interface...I'm expecting my Arduino based analyzer to be as sensitive as the Analox since I will be passing the voltage through a 16 bit ADC and there won't be any potentiometer involved.</span></div><div id="yui_3_16_0_ym19_1_1522152967658_6930" dir="ltr"><span><br></span></div><div id="yui_3_16_0_ym19_1_1522152967658_6930" dir="ltr"><span>Jon</span></div><div class="qtdSeparateBR" id="yui_3_16_0_ym19_1_1522152967658_6954"><br><br></div><div class="yahoo_quoted" id="yui_3_16_0_ym19_1_1522152967658_7046" style="display: block;"> <div style="font-family: times new roman, new york, times, serif; font-size: 16px;" id="yui_3_16_0_ym19_1_1522152967658_7045"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_ym19_1_1522152967658_7044"> <div dir="ltr" id="yui_3_16_0_ym19_1_1522152967658_7043"> <font size="2" face="Arial" id="yui_3_16_0_ym19_1_1522152967658_7042"> <hr size="1" id="yui_3_16_0_ym19_1_1522152967658_7041"> <b><span style="font-weight:bold;">From:</span></b> Al Secor via Personal_Submersibles <personal_submersibles@psubs.org><br> <b id="yui_3_16_0_ym19_1_1522152967658_7048"><span style="font-weight: bold;" id="yui_3_16_0_ym19_1_1522152967658_7047">To:</span></b> Personal Submersibles General Discussion <personal_submersibles@psubs.org> <br> <b><span style="font-weight: bold;">Sent:</span></b> Tuesday, March 27, 2018 7:55 AM<br> <b><span style="font-weight: bold;">Subject:</span></b> Re: [PSUBS-MAILIST] 02 sensor and coms<br> </font> </div> <div class="y_msg_container" id="yui_3_16_0_ym19_1_1522152967658_7154"><br><div id="yiv2375112331"><div id="yui_3_16_0_ym19_1_1522152967658_7566"><div style="color:#000;background-color:#fff;font-family:Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:13px;" id="yui_3_16_0_ym19_1_1522152967658_7565"><div id="yui_3_16_0_ym19_1_1522152967658_7779"><span id="yui_3_16_0_ym19_1_1522152967658_7778">I wonder if replacing the single turn pot with a ten turn pot with a recessed access would help the sensitivity?</span></div><div></div><div id="yui_3_16_0_ym19_1_1522152967658_7564"> </div><div class="yiv2375112331signature" id="yui_3_16_0_ym19_1_1522152967658_8118">Al Secor</div><div class="yiv2375112331qtdSeparateBR" id="yui_3_16_0_ym19_1_1522152967658_7780"><br clear="none"><br clear="none"></div><div class="yiv2375112331yqt5836595539" id="yiv2375112331yqt73342"><div class="yiv2375112331yahoo_quoted" id="yiv2375112331yui_3_16_0_ym19_1_1522071305268_69783" style="display:block;"> <div id="yiv2375112331yui_3_16_0_ym19_1_1522071305268_69782" style="font-family:Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:13px;"> <div id="yiv2375112331yui_3_16_0_ym19_1_1522071305268_69781" style="font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px;"> <div dir="ltr" id="yui_3_16_0_ym19_1_1522152967658_7567"> <font size="2" face="Arial"> </font><hr size="1"> <b><span style="font-weight:bold;">From:</span></b> James Frankland via Personal_Submersibles <personal_submersibles@psubs.org><br clear="none"> <b><span style="font-weight:bold;">To:</span></b> Personal Submersibles General Discussion <personal_submersibles@psubs.org> <br clear="none"> <b><span style="font-weight:bold;">Sent:</span></b> Tuesday, March 27, 2018 6:44 AM<br clear="none"> <b><span style="font-weight:bold;">Subject:</span></b> Re: [PSUBS-MAILIST] 02 sensor and coms<br clear="none"> </div> <div class="yiv2375112331y_msg_container" id="yiv2375112331yui_3_16_0_ym19_1_1522071305268_69780"><br clear="none"><div dir="ltr" id="yiv2375112331yui_3_16_0_ym19_1_1522071305268_69779">I wouldn't get that "el cheapo" one. I have it and its meadiocre at<br clear="none">best. Its soo sensitive on the control pot, you are never quite sure<br clear="none">if its reading right as just the slightest bump and it moves. I know<br clear="none">Scot had the same one and experienced the same. I think it would be<br clear="none">ok for what its intended for, mixed gas diving. But for permenant O2<br clear="none">monitoring, its not so good.<br clear="none"><br clear="none">I use a crowcon disposable one.<br clear="none"><a rel="nofollow" shape="rect" target="_blank" href="https://www.crowcon.com/uk/products/portables/clip-sgd-single-gas.html">https://www.crowcon.com/uk/products/portables/clip-sgd-single-gas.html</a><br clear="none"><br clear="none">Going to check out that one Hank mentioned now though....<br clear="none"><br clear="none">James<br clear="none"><br clear="none">On 24 March 2018 at 22:45, hank pronk via Personal_Submersibles<br clear="none"><<a rel="nofollow" shape="rect" id="yiv2375112331yui_3_16_0_ym19_1_1522071305268_69784" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br clear="none">> Rick,<br clear="none">> Just Google "confined space O2 meter."<br clear="none">> Hank<br clear="none">><br clear="none">><br clear="none">> On Saturday, March 24, 2018, 2:09:09 PM MDT, Rick Patton via<br clear="none">> Personal_Submersibles <<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br clear="none">><br clear="none">><br clear="none">> Hank,<br clear="none">> how can I read up on them and get costs?<br clear="none">> Rick<br clear="none">><br clear="none">> On Sat, Mar 24, 2018 at 10:03 AM, hank pronk via Personal_Submersibles<br clear="none">> <<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br clear="none">><br clear="none">> Rick,<br clear="none">> You can also buy a O2 meter that just tells you when the O2 is low or high<br clear="none">> but does not give percentage. They are pretty cheap.<br clear="none">> Hank<br clear="none">><br clear="none">> On Saturday, March 24, 2018, 1:50:06 PM MDT, Rick Patton via<br clear="none">> Personal_Submersibles <<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs." target="_blank" href="mailto:personal_submersibles@psubs.">personal_submersibles@psubs.</a> org> wrote:<br clear="none">><br clear="none">><br clear="none">> Thanks guys,<br clear="none">> since I didn't hear anything back at all from my post, I figured it didn't<br clear="none">> go out properly. I plan on keeping it as simple as possible regarding lap<br clear="none">> tops and things hooked up to it as that stuff is way out of my league!<br clear="none">> Rick<br clear="none">><br clear="none">> On Sat, Mar 24, 2018 at 9:03 AM, Alan via Personal_Submersibles<br clear="none">> <<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs." target="_blank" href="mailto:personal_submersibles@psubs.">personal_submersibles@psubs.</a> org> wrote:<br clear="none">><br clear="none">> Rick,<br clear="none">> I did receive the original post, but like Jon & Cliff I am going to<br clear="none">> use a computer to receive the signal from my sensors.<br clear="none">> It sounds fancy, but instead of having several sensors for O2,<br clear="none">> CO2, pressure, humidity, temperature, water temperature etc<br clear="none">> with their individual electronics & display units, you can pick the<br clear="none">> sensors up reasonably cheaply & use the one computer& display<br clear="none">> screen for all.<br clear="none">> Alan<br clear="none">><br clear="none">><br clear="none">> Sent from my iPad<br clear="none">><br clear="none">> On 25/03/2018, at 7:43 AM, Alan via Personal_Submersibles<br clear="none">> <<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs." target="_blank" href="mailto:personal_submersibles@psubs.">personal_submersibles@psubs.</a> org> wrote:<br clear="none">><br clear="none">> Rick,<br clear="none">> there is the Famous Elcheapo O2 analysing kit, that you assemble.<br clear="none">> The cost is not a lot more than the included sensor.<br clear="none">> I am not sure of the voltage, but would guess you would use a 9V<br clear="none">> battery.<br clear="none">> <a rel="nofollow" shape="rect" target="_blank" href="https://www.oxycheq.com/el-">https://www.oxycheq.com/el- </a>cheapo-ii-analyzer-kit.html<br clear="none">> Alan<br clear="none">><br clear="none">> Sent from my iPad<br clear="none">><br clear="none">> On 25/03/2018, at 5:55 AM, Rick Patton via Personal_Submersibles<br clear="none">> <<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs." target="_blank" href="mailto:personal_submersibles@psubs.">personal_submersibles@psubs.</a> org> wrote:<br clear="none">><br clear="none">> Thanks Jon<br clear="none">> Yeah I hope he was mistaken as well though he was in tech support at OTS. If<br clear="none">> that’s the case, I’ll lose coms less than a third of the way down to my<br clear="none">> design depth!<br clear="none">> Hank, didn’t you post once about an affordable O2 monitor that you were<br clear="none">> using?<br clear="none">> Rick<br clear="none">><br clear="none">> On Sat, Mar 24, 2018 at 12:40 AM Jon Wallace via Personal_Submersibles<br clear="none">> <<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs." target="_blank" href="mailto:personal_submersibles@psubs.">personal_submersibles@psubs.</a> org> wrote:<br clear="none">><br clear="none">> I saw it Rick, just haven't completely decided yet so didn't respond,<br clear="none">> however you did get me thinking about it again and I believe I'm going to<br clear="none">> use an O2 sensor intended for rebreathers that will be interfaced with an<br clear="none">> Arduino microprocessor. They are manufactured by Analytical Industries and<br clear="none">> distributed by Dive Gear Express, most under $100 and have a life of two<br clear="none">> years.<br clear="none">><br clear="none">> I have no experience with OTS yet but sure hope it is better for more than<br clear="none">> 100 feet.<br clear="none">><br clear="none">> Jon<br clear="none">><br clear="none">><br clear="none">> ________________________________<br clear="none">> From: Rick Patton via Personal_Submersibles <<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs." target="_blank" href="mailto:personal_submersibles@psubs.">personal_submersibles@psubs.</a><br clear="none">> org><br clear="none">> To: psubs chat room <<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs." target="_blank" href="mailto:personal_submersibles@psubs.">personal_submersibles@psubs.</a> org><br clear="none">> Sent: Saturday, March 24, 2018 12:32 AM<br clear="none">> Subject: [PSUBS-MAILIST] 02 sensor and coms<br clear="none">><br clear="none">> I sent out a post the other day regarding what others were using for a 12<br clear="none">> volt oxygen sensor but didn't get a response so not sure it went threw??<br clear="none">> Maybe I typed in the wrong address? I was on the phone with tech support at<br clear="none">> OTS the other day and asked him what range I could expect under standard<br clear="none">> conditions and he said about 100'. 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