Campbell-scientific CS470/CS471 Compact Bubbler System Manuale Utente Scaricare il pdf (Pagina 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

FIGURE C-1.

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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Campbell-scientific CS470/CS471 Compact Bubbler System Manuale Utente Pagina 35