[PSUBS-MAILIST] Ammeter / PLC Question

[Cliff Redus via Personal_Submersibles]

Alan

 I use a company called CRMagnetics for DC current and voltage
transmitters. See  http://www.crmagnetics.com/analog-transducers  I have
two battery banks on my boat, the  main buss (36VDC) and the auxiliary
buss(24VDC).  I use these hall effect 0-5VDC analog voltage transmitters
for the voltage and current in each bank.  Specicially I use the CR5310-30
for voltage and CR5210-20 for the voltage and current of the auxiliary bank
and CR5310-50 for voltage and CR5210-200 for the voltage and current of the
main battery bank.  I take each of these signals into a voltage analog
input module in in my PLC.  These transmitters are a bit pricy at $170-$200
retail from manufacturer but they come up on ebay all the time at a
fraction of this cost. These four transmitters have been rock solid.

Cliff

On Tue, Jan 16, 2018 at 6:32 PM, Alan via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> This is the third time I've sent this as it hasn't returned to me.
> Apologies if you have received it 3 times.
> Re-thinking the ammeter question.
> I had suggested using a shunt for measuring amps & Cliff is using some
> expensive unit based on measuring the magnetic field around the wire.
> With a PLC could I not just buy an inexpensive Voltage sensor with 4-20Ma
> output
> & an inexpensive resistance sensor with  4-20Ma output & calculate the Amps
> in the PLC program based on these 2 numbers (V/R=A)
> I believe these items are called conditioners; most are very expensive.
> Can't
> understand why as multimeters do a number of measuring functions & are
> cheap.
> Does anyone know of a suitable Voltage & resistance sensor, or is this not
> the best way to do it. Cliff, what are you using for measuring voltage,
> thanks.
> Cheers Alan
>
>
> Sent from my iPad
>
> Sent from my iPad
>
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