[PSUBS-MAILIST] Ammeter / PLC Question

[Alan via Personal_Submersibles]

Thanks Cliff,
I will need to do a bit of research on this one. Analogue volt meters to 50V dc sell
for NZ 20- ; surely there must be a volt meter compatible with a plc for around
that price! 
Alan

Sent from my iPad

> On 23/01/2018, at 1:27 PM, Cliff Redus via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> 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
>> 
>> _______________________________________________
>> Personal_Submersibles mailing list
>> Personal_Submersibles at psubs.org
>> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
> 
> _______________________________________________
> Personal_Submersibles mailing list
> Personal_Submersibles at psubs.org
> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.whoweb.com/pipermail/personal_submersibles/attachments/20180123/b6fd6513/attachment.html>