Operation, To the (-) terminal, Figure 1 – Hach-Lange SC 200 Active 4-20 mA Output Module User Manual User Manual
Page 5: Figure 2, External loop resistance may be required, Table 3, Table 4
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Figure 1 Wiring diagram for external customer powered
1 4–20 mA output module
3 Customer power supply
2 External device (Recorder/data
acquisition system)
Table 3 Resistance values for external customer powered
Power supply voltage
Loop minimal
resistance
Loop maximal
resistance
12–18 VDC
0 Ω
250 Ω typical
18–24 VDC
250 Ω
500 Ω typical
Figure 2 Wiring diagram for module powered
1 4–20 mA output module
2 External device (HART master)
Table 4 Resistance values for module powered
Power supply voltage
Loop minimal
resistance
Loop maximal
resistance
15 VDC
0 Ω
350 Ω typical
English 5
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