Quick Reference Instruction Manual for Spare
Transmitter replacement
Wiring
60 / 76
IM01U10A01-00EN-R, 1
st
edition, 2019-12-09
Passive current
output lout
Value
Nominal output current 4 – 20 mA
Maximum output current range 2.4 – 21.6 mA
External power supply 10.5–32 V
DC
Load resistance for secure HART communi-
cation
230–600 Ω
Load resistance at current output ≤ 911 Ω
R =
U - 10.5 V
0.0236 A
911
U in V
32
10.5
R in Ω
0
Fig.33: Maximum load resistance as a function of an external power supply voltage
R Load resistance
U External power supply voltage
The diagram shows the maximum load resistance R as a function of voltage U of the con-
nected voltage source. Higher load resistances are allowed with higher power supply val-
ues. The usable zone for passive power output operation is indicated by the hatched
area.
Fig.34: Passive current output connection lout
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