Reference Manual
00809-0100-4809, Rev DA
Appendix A: Specifications and Reference Data
September 2015
149
Specifications and Reference Data
A.9 2051CF specifications
A.9.1 Performance specifications
Performance assumptions include: measured pipe I.D, transmitter is trimmed for optimum flow accuracy, and performance is
dependent on application parameters.
A.9.2 Functional specifications
Range and sensor limits
Service
Liquid, gas, and steam applications
4–20 mA HART (output code A)
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 the
HART protocol.
Power supply
External power supply required. Standard transmitter
operates on 10.5 to 42.4 Vdc with no load.
Turn-on time
Performance within specifications less than 2.0 seconds
after power is applied to the transmitter.
Load limitations
Maximum loop resistance is determined by the voltage
level of the external power supply, as described by:
F
OUNDATION Fieldbus (output code F)
Power supply
External power supply required; transmitters operate on
9.0 to 32.0 Vdc transmitter terminal voltage for non-I.S.
applications, 9.0 to 30 Vdc for entity model intrinsically
safe applications and 9.0 to 17.5 Vdc for FISCO intrinsically
safe applications.
Current draw
17.5 mA for all configurations (including LCD display
option)
Indication
Optional 2-line LCD display
Table 13. Flow Performance - Flow Reference Accuracy
(1)
1. Range 1 flowmeters may experience an additional uncertainty up to 0.9%. Consult your
Emerson Process Management Representative for exact specifications.
2051CFA Annubar Flowmeter
Ranges 2-3 ±2.30% of flow rate at 5:1 flow turndown
2051CFC_A Compact Annubar Flowmeter - Annubar option A
Ranges 2-3 Standard ±2.60% of flow rate at 5:1 flow turndown
Calibrated ±2.30% of flow rate at 5:1 flow turndown
Range
2051CF minimum
span
Range and sensor
limits
1
0.5 inH
2
O
(1,24 mbar)
0 to 25 inH
2
O
(62,16 mbar)
2
2.5 inH
2
O
(4,14 mbar)
0 to 250 inH
2
O
(0,62 bar)
3
6.67 inH
2
O
(16,58 mbar)
0 to 1000 inH
2
O
(2,49 bar)
Maximum Loop Resistance = 43.5 ⫻ (Power Supply Voltage – 10.5)
The Field Communicator requires a minimum loop resistance of
250 for communication.
1387
1000
500
0
10.5 20 30
42.4
Voltage (Vdc)
Load (Ohms)
Operating
Region