Good day to all.

I'm re-visiting an existing project because the client is now asking for
remote temperature readings.  Their preferred temperature sensor is a 100R
platinum RTD which they will supply.  I need to condition those sensors and
turn it into a serial bit stream and down a fiber.

The complicating factor is that this will be operating in the presence of
large AC magnetic magnetic fields generated by currents in the order of
250K Amps or so.

The easiest solution is to purchase an off-the-shelf RTD transmitter with
fiber output - and I'm starting a search as soon as I finish typing
this.  But I'm hoping that someone has a favorite unit they like and can
offer up supplier names and model numbers.  Expense is a consideration - I
need 24 units for this particular project.

If I can't find anything suitable, I have to build it.  In that case, I'm
looking for design hints.  I've seen the ap notes offered by LT and the
like - I'll be looking at those as well.

I've got my choice of 2 power sources available: 12Vdc @ 30 mA sitting
about 1000 Vdc above ground or 125 Vdc ground referenced.  Neither is
optimal but its what I've got.

Any suggestions appreciated.

dwayne

--
Dwayne Reid   <dwayner@planet.eon.net>
Trinity Electronics Systems Ltd    Edmonton, AB, CANADA
(780) 489-3199 voice          (780) 487-6397 fax

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