<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>Thanks Cliff,</div><div id="AppleMailSignature">I will need to do a bit of research on this one. Analogue volt meters to 50V dc sell</div><div id="AppleMailSignature">for NZ 20- ; surely there must be a volt meter compatible with a plc for around</div><div id="AppleMailSignature">that price! </div><div id="AppleMailSignature">Alan<br><br>Sent from my iPad</div><div><br>On 23/01/2018, at 1:27 PM, Cliff Redus via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br><br></div><blockquote type="cite"><div><div dir="ltr"><div>Alan</div><div><br></div><div><div> I use a company called CRMagnetics for DC current and voltage transmitters. See <a href="http://www.crmagnetics.com/analog-transducers" target="_blank">http://www.crmagnetics.com/<wbr>analog-transducers</a> 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. </div><div><br></div><div>Cliff</div></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Jan 16, 2018 at 6:32 PM, Alan via Personal_Submersibles <span dir="ltr"><<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">This is the third time I've sent this as it hasn't returned to me.<br>
Apologies if you have received it 3 times.<br>
Re-thinking the ammeter question.<br>
I had suggested using a shunt for measuring amps & Cliff is using some<br>
expensive unit based on measuring the magnetic field around the wire.<br>
With a PLC could I not just buy an inexpensive Voltage sensor with 4-20Ma output<br>
& an inexpensive resistance sensor with 4-20Ma output & calculate the Amps<br>
in the PLC program based on these 2 numbers (V/R=A)<br>
I believe these items are called conditioners; most are very expensive. Can't<br>
understand why as multimeters do a number of measuring functions & are cheap.<br>
Does anyone know of a suitable Voltage & resistance sensor, or is this not<br>
the best way to do it. Cliff, what are you using for measuring voltage, thanks.<br>
Cheers Alan<br>
<br>
<br>
Sent from my iPad<br>
<br>
Sent from my iPad<br>
<br>
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