[PSUBS-MAILIST] Flux Gate Compass

[Jim Todd via Personal_Submersibles]

Cliff,
I'm pleasantly surprised to hear your sensor works well within such close proximity to the pressure hull. I would have thought you'd have to mount it some distance from all that steel either vertically like Gary's or horizontally as David proposes.   Possibly a greater consideration is the distance from any motors and how you shield them from that interference. 
Jim

Sent from my iPhone

> On Aug 6, 2015, at 11:18 AM, Cliff Redus via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> David, I use a OS5000-S Solid State Tilt Compensated 3 Axis Digital  Compass (Serial) from   www.ocean-server.com/compass.html .  As this will not work in a steel pressure hull, I designed a 1-atm pod that contains the sensor out 6061-T6 and anodized it.  This is mounted out side the pressure hull but inside my FRP shell cover.  I have been happy with its performance.  It sends a RS-232 signal in ASCII that contains the boat heading, roll and pitch angle as well as the water temperature.  In the PLC, I have ladder logic that parses the string and converts these into real variables that are display on the HMI both graphically and as text.  these sensors cost $325.  There only a good idea if you are using a PLC that has a spare serial communication port.  
> 
> 
> Cliff
> 
>> On Thu, Aug 6, 2015 at 1:17 AM, David Colombo via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>> Bought on Ebay. $49 delivered. Looks like it made in 2005.
>> 
>> 
>>> On Wed, Aug 5, 2015, 10:57 PM Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>>> David,
>>>                 How much was it ?    From radio Shack ?
>>>  
>>> Brian
>>> 
>>> --- personal_submersibles at psubs.org wrote:
>>> 
>>> From: David Colombo via Personal_Submersibles <personal_submersibles at psubs.org>
>>> To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
>>> Subject: [PSUBS-MAILIST] Flux Gate Compass
>>> Date: Wed, 5 Aug 2015 22:49:10 -0700
>>> 
>>> Hi Guys, I just picked up a flux gate compass,by Micronta (Radio shack) which comes with about a 9" long pig tail from the sensor to the unit itself. I think it could work quite nicely if I can extend the length of wire from sensor to the display. Any thoughts about  this. The sensor is about 1" cubed and has a lead with six wires into the display. Its a 12v unit and the power input is on the display itself. So before I tear it apart, I thought I would put it out there on the possibility and how to determine the appropriate wire gauge size. I will want to extend the pigtail to around 10 feet.
>>> 
>>> Best Regards,
>>> David Colombo
>>> 
>>> 804 College Ave
>>> Santa Rosa, CA. 95404
>>> (707) 536-1424
>>> www.SeaQuestor.com
>>> 
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