How do you check the loop current zero (4mA) and span (20mA) of a HART field instrument? : FieldComm Group Support Portal

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How do you check the loop current zero (4mA) and span (20mA) of a HART field instrument? Print

Modified on: Fri, 22 Jul, 2016 at 12:31 PM

See HCF_SPEC-151 Common Practice Command Specification, 6.3.1 Loop Current Trim Procedure.

Commands needed to perform two point calibration of the field device's Loop Current value:

Command 40 Enter/Exit Fixed Current Mode
Command 45 Trim Loop Current Zero
Command 46 Trim Loop Current Gain

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