On Tue, 14 Nov 2006 18:05:57 -0700, Bob Axtell wrote:
> William Chops Westfield wrote:
>> On Nov 14, 2006, at 3:08 AM, Bob Axtell wrote:
>>
>>
>>> the client only wants to detect a FLOW of current, so that
>>> anything over 1 A would be acceptable.
>>>
>>>
>> In that case, can't you just use a small coil and a (really
>> cheap) (digital) hall effect sensor?
>>
>> BillW
>>
> Gee Bill, that is very clever. I had not thought of it. I might try
> that for GO/NOGO testing.

We needed a way to test a Hall Effect switch used in a paddle wheel
type flow sensor assembly in production. We didn't want any moving
Rube Goldberg type contraptions so we made a small electromagnet
assembly (steel core coil) and pulsed it to simulate a rotating
magnet. It worked great and was easy to implement.

Lately I've been playing with NVE's GMR sensors. Nice devices, very
sensitive and easy to use.

Matt Pobursky
Maximum Performance Systems

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