[PSUBS-MAILIST] Flux Gate Compass

[via Personal_Submersibles]

If you twist the positive and negative motor cables together they cancel the magnetic flux created by the current flow. 

Keith T.

Cliff Redus via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

>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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