Appendix c. 4 to 20 ma operation, Appendix c) – Campbell Scientific CS470/CS471 Compact Bubbler System User Manual
Page 35
Appendix C. 4 to 20 mA Operation
The load resistance connected to the CS470/CS471 must not exceed a specific
maximum value. This value depends on the level of the supply voltage of the
CS470/CS471. If the load resistance is greater, the output current can no
longer be evaluated. Smaller load resistances are allowed.
•
Read off the maximum load resistance for your power supply from
Example: Power supply 18 volt max. load resistance 450 Ohm.
The CS470/CS471 delivers an output current corresponding to the measured
value for a load resistance of up to 450 Ohm.
•
Dimension the connected electrical circuit accordingly. Check the input
resistance of the connected peripheral.
FIGURE C-1. Diagram to determine the maximum load resistance as a
function of the power supply.
C-1
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