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when we are using HART COMMUNICATOR why we are using 250 ohm
resistance while using HART COMMUNICATOR.

Question Posted / sivakumar d

Answer Posted / sivakumar d

Its Ohms's Law:

We need output: 4 to 20mA. corresponding voltage level is 1-5V

when Min Transmitter O/P

I=V/R =1/250 =0.004 =4mA

When Max Tranmitter O/P
I=V/R =5/250=0.02 =20mA.

So to get Standard Current Signal We need 250 ohms resistor.

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