Ma (Output Code A); A.2.3 4–20 Ma (Output Code A) - Emerson Rosemount 2051 Reference Manual

Appendix A: Specifications and Reference Data
April 2013
A.2.3 4–20 mA (output code A)
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:
The Field Communicator requires a minimum loop resistance of 250
For CSA approval, power supply must not exceed 42.4 V.
Indication
Optional two line LCD/LOI Display
Zero and Span adjustment requirements (HART)
Zero and span values can be set anywhere within the range limits stated in
Span must be greater than or equal to the minimum span stated in
Output
2051
Digital communications based on HART Revision 5 protocol.
2051 with Selectable HART
The 2051 with Selectable HART 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 (LOI).
104
Maximum Loop Resistance = 43.5 * (Power Supply Voltage – 10.5)
1387
1000
500
0
10.5
Operating
Region
20 30
42.4
Voltage (Vdc)

for communication.
Appendix A: Specifications and Reference Data
Reference Manual
00809-0100-4107, Rev BA
Table 1 and Table
Table 1 and Table 2.
2.