<html><head></head><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:12px"><div id="yui_3_16_0_1_1456352455644_4424"><span id="yui_3_16_0_1_1456352455644_4425">When I dive Gamma, I find I have a slight negative pressure for most of the dive as the air shrinks from the cold. The temperature swing is huge from surface to 100 feet. As a rule when I dive for any length of time I balance the sub out to Zero on the altimeter by either turning on the compressor or giving a shot of air before I start to surface. It is pretty easy to keep the sub within 100 feet from set point on the altimeter, and that is my comfort level.</span></div><div id="yui_3_16_0_1_1456352455644_4424"><span>Hank</span></div> <div class="qtdSeparateBR"><br><br></div><div class="yahoo_quoted" style="display: block;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 12px;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div dir="ltr"><font size="2" face="Arial"> On Wednesday, February 24, 2016 2:58 PM, Lasse Schmidt Westrén via Personal_Submersibles <personal_submersibles@psubs.org> wrote:<br></font></div> <br><br> <div class="y_msg_container"><div id="yiv5470737927"><div><div dir="ltr"><div>Is it possible to correlate the alarm to temperature change in cabin from start of dive? Pressure change might well be over 4 psi if it is hot outside and the water is cold.<br clear="none"><br clear="none"></div>Cheers Lasse<br clear="none"><div><div class="yiv5470737927gmail_extra"><br clear="none"><div class="yiv5470737927gmail_quote">2016-02-24 20:12 GMT+01:00 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>:<br clear="none"><div class="yiv5470737927yqt3830611511" id="yiv5470737927yqt84353"><blockquote class="yiv5470737927gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"><br clear="none">
I think this is somewhat subjective but what is general consensus on maximum cabin pressure swing (higher/lower) relative to hatch closing at the start of a dive before setting off alarms? My thought is that an alarm should sound well before any point of emergency. I'm considering sounding a warning at 2psi +/- and an alarm at 4psi +/- but I'm not sure if this is too strict.<br clear="none">
<br clear="none">
Jon<br clear="none">
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</blockquote></div></div><br clear="none"><br clear="all"><br clear="none">-- <br clear="none"><div class="yiv5470737927gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div>Lasse Schmidt Westrén<br clear="none"></div>Upplevelsepresent.se<br clear="none">070-28 32 660<br clear="none"><br clear="none"><span><img src="https://docs.google.com/uc?export=download&id=0B3nDTweb1xR6WTBRZkZnSVV3ZlU&revid=0B3nDTweb1xR6K2trSll3bm5HNW1FUmxoRllNaVBvWXdZZSs0PQ" height="44" width="149"><br clear="none"></span></div><div><span>Upplevelser, events och kryssningar.<br clear="none"></span></div></div></div></div></div></div>
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