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Re: [PSUBS-MAILIST] Preasure Gauge

guys
 
    this sounds like reinventing the mouse trap again. why bother? back up gauge stainless steel analog psi gauge with correction chart. 100 dollars us a glycerin filled insulator to eliminate corrosion problems. primary gauge 24 volt transducer 4-20 ma output to a display with adjustable zero and span. but remember all these are ambient referenced, so if cabin pressure goes up the gauges will read low.
 
    control system for mini rov.
    three axis control       
    video                       
    heading                    
    depth                   
    lights                   
   
    Allen bradley has a good remote io system that runs on two wire control loop and power feeds. of 24 volt. that would limit the umbilical to six wire two for control two for video two for power. Surface station video monitor. plc for control, display for heading and depth, switches for aux controls i.e. lightning buoyancy control necessary , weight slightly negative and power it to the surface.
 
rick m
 
----- Original Message -----
From: Todd Fee
Sent: Thursday, February 23, 2006 7:50 AM
Subject: RE: [PSUBS-MAILIST] Preasure Gauge

What about something like this then?
 
These guys make pressure transducers/transmitters for boilers, which operate in a nastier environment than you plan on putting your ROV in.
 
Assuming your ROV is operated on a cable you could get the matching gauge mounted on your instrument panel and again mark up the face to read in depth instead of PSI. A call to a gauge manufacturer wouldn't be a waste of time here.
 
Todd
 
 
From: owner-personal_submersibles@psubs.org [mailto:owner-personal_submersibles@psubs.org] On Behalf Of George Slaterpryce
Sent: Thursday, February 23, 2006 10:25 AM
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] Preasure Gauge

I need the gauge to report back electronicly so an analog gauge would be good only if I had a video camera that looked at it constantly.
 
George Slaterpryce
----- Original Message -----
From: Todd Fee
Sent: Thursday, February 23, 2006 10:20 AM
Subject: RE: [PSUBS-MAILIST] Preasure Gauge

I'm sure this a subject that has come up many times however I'm new at this. Could you not simply use a mechanical pressure gauge and recalibrate the dial to read in feet instead of PSI? I have a mechanical pressure gauge on my old Jeep that uses a small tube to the oil pump to read the pressure. The tube is always full of oil and it doesn't foul the gauge so I can't imagine that water would either. Obviously an oil pressure gauge from an automobile wouldn't work because it only reads uo to about 80 PSI but with some research I'm sure you can find a gauge that reads up to whatever PSI you expect to encounter and beyond.

From: owner-personal_submersibles@psubs.org [mailto:owner-personal_submersibles@psubs.org] On Behalf Of George Slaterpryce
Sent: Thursday, February 23, 2006 9:48 AM
To: PSUBS Mailing List
Subject: [PSUBS-MAILIST] Preasure Gauge

I'm looking to make myself some sort of preasure gauge so I can calculate depth, but the best Idea I can come up with is to embed a Preasure sensor in a ball of silicon and mount it to the outside of my preasure hull, I'm thinking that the silicon will transfer preasure to the sensor evenly as well as protect it from water damage. The biggest problem with that would be the wires coming out of the silicon ball causing rippage if any stress was put on them, thus allowing water in however minute amount to get to the sensor, so I'd have to make some sort of cradle for it so it can't move... maybe epoxy it onto a machine brass craddle that can be mounted to the preasure hull which I can then run the wires through so I can connect the Preasure sensor to the MC this way I can avoid loose wires. Another problem is would the silicon transfer the preasure so I could get an accurate reading.
 
Am I over thinking this, is there some simple solution I'm over looking?
 
Illustration of what I'm talking about at http://www.captovis.com/marine/designsketches/preasuresensorandcradle.png Kind of small and all, but I stick my doodles in that directory so I can reffer to them later. Kind of like a "design written on a napkin" repository.
 
Thanks
George H. Slaterpryce III