OK; there are these nice ceramic substrates with platinum film deposited to make a 100 ohm (or 50 or 1000) resistor,for use in measuring temperature which is linearally correlated accurately with the resistance; they have 2 leads like an ordinary resistor. Then there are these RTD probes made with those devices, BUT there aer now THREE leads(!). Where can i get eXplicit info concerning the care and USE of these three phase global warmers?
RTD use Q
Dec 10, 2010
4 Replies
'fraid it doesn't get much more eXplcit than
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Not quite linear, but close. You can get surface mount units too,
1206s or whatever.
Omega and the other RTD folks have appnotes.
A 3-wire RTD just saves a little copper over using a 4-wire RTD. That matters a little in industrial systems with long cable runs.
John
I know that a 4-wire RTD would not be three-phase WHY connected.. A slightly better description might be "Kelvin" if it was implemented correctly inside.
Thanks. The second reference was perfect for me.
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