4-20 Ma Hart (Output Code A); Output; A.2.2 4–20 Ma Hart (Output Code A) - Emerson Rosemount 3051 Reference Manual

Reference Manual
00809-0100-4797, Rev DA
Table A-2. Rosemount 3051CA and 3051T Range and Sensor Limits
3051CA
Range and sensor limits
Minimum
Upper
(1)
span
(URL)
0.30 psi 30 psia
1
(20,68 mbar) (2,06 bar)
1.00 psi 150 psia
2
(68,94 mbar) (10,34 bar)
5.33 psi
800 psia
3 (367,49
(55,15 bar)
mbar)
26.67 psi 4000 psia
4
(1,83 bar) (275,79 bar)
5 N/A
1. For output options W and M, minimum span are: Range 2 - 1.50 psi(0,10 bar), Range 3 - 8.00 psi (0,55 bar), Range 4 - 40.00 psi (2,75 bar), Range 5
for Rosemount 3051T - 2000.00 psi (137,89 bar).
2. Assumes atmospheric pressure of 14.7 psig.
Service
Liquid, gas, and vapor applications
A.2.2 4–20 mA HART (output code A)
Max. Loop Resistance = 43.5 (Power Supply Voltage – 10.5)
1387
1000
Operating
500
Region
0
30
10.5 20
Voltage (Vdc)
Communication requires a minimumloop resistance of 250 ohms.
1. For CSA approval, power supply must not exceed 42.4 V.
Power supply
External power supply required. Standard transmitter
(4–20mA) operates on 10.5–42.4 Vdc with no load.
Load limitations
Maximum loop resistance is determined by the voltage
level of the external power supply described by:
Indication
Optional two-line LOI/LCD display
Specifications and Reference Data
Lower
(LRL)
0 psia
1
(0 bar)
0 psia
2
(0 bar)
0 psia
3
(0 bar)
0 psia
4
(0 bar)
N/A N/A 5
(1)
42.4
Specifications and Reference Data
Minimum
Upper
(1)
span
(URL)
0.30 psi 30.00 psi
(20,68 mbar) (2,06 bar)
1.00 psi 150.00 psi
(68,94 mbar) (10,34 bar)
5.33 psi
800.00 psi
(367,49
(55,15 bar)
mbar)
26.67 psi 4000.00 psi
(1,83 bar) (275,79 bar)
2000.00 psi 10000.00 psi
(137,89 bar) (689,47 bar)
Optional configuration buttons
Configuration buttons need to be specified:
Digital zero trim (option code DZ) changes digital value

of the transmitter and is used for performing a sensor
zero trim.
Analog zero span (option code D4) changes analog value

and can be used to rerange the transmitter with an
applied pressure.
A.2.3 Output
Two-wire 4–20 mA, user selectable for linear or square root
output. Digital process variable superimposed on 4–20 mA
signal, available to any host that conforms to HART
protocol. The Rosemount3051 comes with Selectable
HART Revisions. Digital communications based on HART
Revision 5 (default) or Revision 7 (option code HR7)
protocol can be selected. The HART revision can be
switched in the field using any HART based configuration
tool or the optional local operator interface (M4).
Power advisory diagnostics
Power advisory diagnostics pro-actively detect and notify
you of degraded electrical loop integrity before it can affect
your process operation. Example loop problems that can be
detected include water in the terminal compartment,
corrosion of terminals, improper grounding, and unstable
power supplies.
August 2016
3051T
Range and sensor limits
Lower
(LRL)(absolute) (LRL)(gage)
0 psia
(0 bar)
0 psia
(0 bar)
0 psia
(0 bar)
0 psia
(0 bar)
0 psia
(0 bar)
(2)
Lower
-14.70 psig
(-1,01 bar)
-14.70 psig
(-1,01 bar)
-14.70 psig
(-1,01 bar)
-14.70 psig
(-1,01 bar)
-14.70 psig
(-1,01 bar)
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