MSA Ultima X Series Installation & Maintenance Instructions Manual page 32

Figure 1-17. Three-Wire Printed Circuit Board
(with HART Protocol)
Installation of Three-Wire, 4-20 mA Output with HART Protocol
1. Connect 8-30 VDC power lead to J8-1 (see FIGURE 1-17)
2. Connect J8-2 to the 4-20 mA input on the remote system.
3. Terminate the 4-20 mA line with 230-500 Ohms of resistance.
4. For three-wire operation, connect the signal ground to J8-3.
5. Connect the sensor module to main pc board connector J-1.
6. Wire for optional relays, if applicable (see Appendix A).
7. Assemble lid on the enclosure.
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