Instrument inspection

2017-02-21View Original

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Instrument testing: why must the resistance in the circuit be greater than 250 ohms for HART to function?

Reply #22017-02-21

Saw the title and came to learn*, but got no reply

Reply #32017-02-22

It would be better to change the topic to something like: Does a loop need a resistor of 250 ohms or more in order to support HART? There’s nothing new about this topic; the site allows for searching

Reply #42017-02-22

Hehe, for 475 communication, it is required that the loop resistance be greater than 600 ohms.

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Instrument inspection

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