17
Electrical connections
— Ensure that the supply voltage provided by the control unit (ignoring the
load resistance) is at least as high as specified in the tables of page 21 to
page 22.
— If digital communication in accordance with HART is to be used, the load
resistance of the supply unit must lie between 230 and 500 Ω.
— The permissible cable lengths are shown in the tables on page 21 to
page 22. In each case, use the line marked "Number of transmitters = 1".
01223758_1_en.eps
Non-explosion-hazard area
Control unit
4 ... 20 mA
0 V
+
–
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