[PSUBS-MAILIST] Flux Gate Compass

Thu Aug 6 13:54:44 EDT 2015

Mine is mounted about 5" from hull.  The sendor manufacturer has a hard and
soft iron calibration procedure to help with this but I have only used
factory calibration.  I think you are right on the staying away from motors
and any large current carying cables that would generate significant
electric fields.

On Thursday, August 6, 2015, Jim Todd via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> 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
> <javascript:_e(%7B%7D,'cvml','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
> <javascript:_e(%7B%7D,'cvml','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
>> <javascript:_e(%7B%7D,'cvml','personal_submersibles at psubs.org');>> wrote:
>>
>>> David,
>>>                 How much was it ?    From radio Shack ?
>>>
>>> Brian
>>>
>>> --- personal_submersibles at psubs.org
>>> <javascript:_e(%7B%7D,'cvml','personal_submersibles at psubs.org');> wrote:
>>>
>>> From: David Colombo via Personal_Submersibles <
>>> personal_submersibles at psubs.org
>>> <javascript:_e(%7B%7D,'cvml','personal_submersibles at psubs.org');>>
>>> To: Personal Submersibles General Discussion <
>>> personal_submersibles at psubs.org
>>> <javascript:_e(%7B%7D,'cvml','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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>>
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