Loop Power - Siemens SITRANS LR260 Quick Start Manual

Loop power

Typical Connection Drawing
: Loop voltage is the voltage at the terminals of the power supply (not the voltage at the
Note
terminals of the device).
power
loop voltage
supply
VL
Allowable operating area of SITRANS LR260
Loop Voltage versus Loop Resistance
1000
900
800
700
600
500
400
300
RL=272.7*VL - 4554.1
200
100
(16.7v, 0 ohms)
0
10.00
A5E32106122 SITRANS LR260 (HART) – QUICK START MANUAL
loop resistance
RL
-
+
loop current IL
Power Supply Requirements
(17.8v, 300 ohms)
15.00
Loop Voltage – VL
(30.0v,845 ohms)
RL=44.6*VL - 493.4
ALLOWABLE OPERATING
AREA
20.00 25.00
LR260
30.00
Page EN-19