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Reference Manual
00809-0100-4026, Rev HA
Appendix A: Reference data
November 2014
Reference Data
A.1.2 4-20 mA HART
®
(output option code H)
Output
Two-wire 4–20 mA, HART Revision 5. Digital process variable is superimposed on 4–20 mA
signal, and available to any host that conforms to the HART protocol. The HART signal can be
used in a multidrop mode.
Figure A-1. 4-20 mA HART
Signal wiring
Recommended output cabling is twisted shielded pairs, 18-12 AWG
HART Tri-Loop
By sending the digital HART signal to the optional HART Tri-Loop, it is possible to have up to
three additional 4–20 mA analog signals. See the Rosemount 333 HART Tri-Loop Product Data
Sheet (document number 00813-0100-4754) for additional information.
Figure A-2. Rosemount 333 HART Tri-Loop
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