A.2.3
Digital output
Switching signal for high and low limits (using the same pin)
Output type
PNP/NPN configurable
Switching function
Normally open
Permanent current rating
< 50 mA
Maximum voltage drop
2.5 V
A.2.4
4-20 mA analog output
Load limitations
Maximum loop resistance is determined by the voltage level of the external power supply:
Maximum Loop Resistance = 43.5
×
(External Power Supply Voltage - 18) + 600 Ω
Figure A-2: Load Limits
18
19
20
21
22
23
25
26
27
28
29
700
600
1100
1000
900
800
1200
30
24
B
A
860
1121
A. Loop Resistance (Ω)
B. External Power Supply Voltage (Vdc)
Specifications and reference data
Reference Manual
May 2021
00809-0200-4480
68
Rosemount 1408A Level and Flow Transmitter