All HART SMAR transmitter have 2 extra connectors for testing the loop current.
Open the Terminal Block Lid of the transmitter and look below the contacts that connect to the power supply. Find the word "TEST" between two small terminals.
Set your multi-meter in current measuring mode and connect it on those terminals.  Watch for the polarity.
When you place the current meter on those two connectors, the current will continue to pass through your loop and transmitter, but it will also be deviated to your meter for verification.
Important Note: Make sure that your process is safe and halted in a way that during testing or maintenance activities it will not cause any type of damages.
Refer to this picture from the Manual: