Circuit Diagrams For Non-Hart Communication - Hach HART Manual Del Usuario

Figure 4 HART voltage circuit - active module powered
1 HART module
2 Hand-held terminal (Secondary
communication device)
Figure 5 HART current circuit - active module powered
1 HART module
2 Hand-held terminal (Secondary
communication device)
Table 2 Resistance values for active module powered HART
Loop resistance
250–350 Ω
6 English
3 External device (Recorder/data
acquisition system)
3 External device (Recorder/data
acquisition system)
circuits

Circuit diagrams for non-HART communication

Figure 6, Table 3, Figure 7 and
communication.
Figure 6 4-20 mA circuit - active module powered
1 HART module
Table 3 Resistance values for active module powered 4-20 mA
Power supply voltage
15 VDC
Figure 7 4-20 mA circuit - externally/loop powered
1 HART module
2 External device (Recorder/data
acquisition system)
Table 4 are not recommended for HART
2 External device (Recorder/data
acquisition system)
circuit
Loop resistance
0–350 Ω
3 External power supply