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Reference Manual
00809-0100-4808, Rev CA
June 2008
5-5
Rosemount 3051N
FUNCTIONAL
SPECIFICATIONS
Service
Liquid, gas, or vapor
Output 4–20 mA, user-selectable for linear or square root output; digital signal based
on HART
®
protocol
Power Supply Load Limitations
Maximum loop resistance is determined by the voltage level of the
external power supply, as described by:
Temperature Limits Ambient
0 to 185 °F (-18 to 85 °C)
with meter option:
0 to 175 °F (-18 to 80 °C)
Process
(1)
(2)
(3)
0 to 250 °F (-18 to 121 °C) Coplanar
™
flange
0 to 300 °F (-18 to 149 °C) traditional flange
Storage
0 to 212 °F (-18 to 100 °C)
with meter option:
0 to 185 °F (-18 to 85 °C)
Communication requires a minimum loop resistance of 250 ohms.
Max. Loop Resistance = 43.5 (Power Supply Voltage – 10.5) ohms
0
500
1000
1500
1935
10.5 20
30
40 55
Load (ohms)
Voltage (V dc)
Design
Region
(1) Process temperatures above 185 °F (85 °C) require derating the ambient temperature limits
by 1.5 °F per degree above 185 °F.
(2) 220 °F (104 °C) limit in vacuum service; 130 °F (54 °C) for pressures below 0.5 psia
(3) EPR O-ring is limited to 150 °F (66 °C) process temperature.