Which is better: 2-wire or 3-wire transmitter
Dear Sirs,
I am going to buy two NI modules 9203. The problem I am facing now is related to the transmitters (pressure transmitter and resistance thermometer). The output of the transmitters is 4-20 mA. I have the option either to get the transmitter with 2-wire or 3-wire output.
I want to know which is better regarding the accuracy of the readings and the noise, taking into account that the cable will 5 meter long.
Thanks for your help.
Yours,
Ehab
In industrial nomemclature, a two wire transmitter is powered by the receiving device over the same two wires as the signal (4-20mAdc). The power is typically 24 VDC.
A 3-wire transmitter requires two wires for signal and three additional wires for power.
There are howevr some dc powered transmitters with special shielding that use a three wire connection. It must be compatible with both the transmitter and the reciever.
Another tip is to always use a 4 wire RTD for maximum accuracy up to hundreds of meters. For short runs a 3-wire RTD will usually be satisfactory IF all three wires are of equal rresistance.
Orlando Accounting
Accounting in Orlando
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