Jim The DWYER (0 to 500 psi digital for 125 bucks) pressure gauge is not going to give you any better accuracy than my own (modified) 6 inch stainless steel depth gauge (ref. attached image), as these two gauges are both members of the same accuracy class, i.e. +/- 1%. A lot of times, the so called "better fine adjustments possible" is more of an illusion made possible by using a microprocessor's ability to simply add more digits after a decimal point... The gauge's microprocessor uses an ADC to sample discrete values that it reads off the same gauge's analog sensor - so whatever the fancy LED display presents you - it'll never be more accurate than the accuracy of it's analog sensor. To get any higher accuracy from DWYER you'll have to spend at least $300 dollars. Best regards, Jens Laland ** Hi Brian, ** ** Thanks for the tip on the gauge! Despite the fact that I have a 4 inch SS ** analog gauge, I think I'll change it out for the unit you located because ** of ** the much better fine adjustments possible. ** ** Best Regards, ** ** Jim K ** ** On Sat, Mar 6, 2010 at 7:25 PM, Brian V. Ryder ** <brian@subatlantic.com>wrote: ** **> **> http://www.grainger.com/Grainger/ecatalog/N-/No-15/Ntt-digital+pressure+gauge?op=search&sst=subset **> **> **> **> a 0 to 500 psi digital for 125 bucks **> **> **> **> Brian V. Ryder **> **> brian@subatlantic.com **> **> **> **> CONFIDENTIALITY NOTICE: This e-mail message, including any attachments, **> is **> for the sole use of the intended recipient(s) and may contain **> confidential **> and privileged information or otherwise be protected by law. Any **> unauthorized review, use, disclosure or distribution is prohibited. If **> you **> are not the intended recipient, please contact the sender by reply **> e-mail **> and destroy all copies of the original message. **> **> **> **> *From:* owner-personal_submersibles@psubs.org [mailto: **> owner-personal_submersibles@psubs.org] *On Behalf Of *kocpnt tds.net **> *Sent:* Saturday, March 06, 2010 4:35 PM **> *To:* personal_submersibles@psubs.org **> *Subject:* Re: [PSUBS-MAILIST] depth gauges **> **> **> **> Hi Alan, **> **> **> **> I was concerned about that myself, but will have a side scan sonar **> aboard **> and the side benefit is a distance to the bottom reading. **> **> **> **> While really not a depth gauge as the reading will vary with bottom **> structure and depth, it should let me know quickly how well I have **> achieved **> neutral bouyancy. **> **> **> **> I'll let you know how well it works when I'm done testing. **> **> **> **> Best Regards, **> **> **> **> Jim K **> **> On Sat, Mar 6, 2010 at 2:21 PM, Alan James <alanjames@xtra.co.nz> wrote: **> **> Hi psubbers, **> **> Went for a couple of dives yesterday (scuba). The last being in an old **> quarry where the visibility was bad **> **> & when I hit a thermocline it just went black. I didn't know wether I **> was **> going up or down half the time. **> **> Was thinking from this experience that I'd like a digital depth readout **> in **> my sub in fine increments of at least 6 inch depth **> **> deviations. Is there anything like that out there that would be **> suitable? **> And if so how is it set up. ie. is the pressure sensor outside **> **> the sub with wires through the hull or is it on the inside threaded into **> a **> hull penetration or something. **> **> Any thoughts on anything that might be adaptable to this purpose would **> be **> appreciated also. **> **> Regards Alan **> **> **> ** -- In asserting which technologies are likely to be of crucial importance we must also take due note of some spectacular errors that have been made in the past: "There is no likelihood that man can ever tap the power of the atom", Robert Millikan, Nobel Laureate, 1923 "Heavier than air flying machines are impossible", Lord Kelvin, President of the Royal Society, 1885
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