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Reference Manual
00809-0100-4021, Rev FB
August 2011
Rosemount 3144P
A-8
Load Limitations
NOTE
HART Communication requires a loop resistance between 250 and 1100
ohms. Do not communicate with the transmitter when power is below 12 Vdc
at the transmitter terminals.
F
OUNDATION
FIELDBUS
SPECIFICATIONS
Power Supply
Powered over F
OUNDATION
Fieldbus with standard fieldbus power supplies.
Transmitters operate on 9.0 to 32.0 Vdc, 11 mA maximum. Transmitter power
terminals are rated to 42.4 Vdc.
Wiring Diagram
Alarms
The AI function block allows the user to configure the alarms to HIGH-HIGH,
HIGH, LOW, or LOW-LOW with a variety of priority levels and hysteresis
settings.
Transient Protection (option code T1)
The transient protector helps prevent damage to the transmitter from
transients induced on the loop wiring by lightning, welding, heavy electrical
equipment, or switch gears. The transient protection electronics are contained
in an add-on assembly that attaches to the standard transmitter terminal
block. The transient terminal block is not polarity insensitive. The transient
protector has been tested to the following standard:
• IEEE C62.41-1991 (IEEE 587), Location Categories B3.
• Combinational Wave, 6kV/3kA peak, 1.2*50uS/8*20uS.
• Ring Wave, 100kHz, 6kV/0.5kA peak
• EFT, 4kV, 2.5kHz, 5*50nS
• Loop resistance added by protector: 22 ohms max.
• Nominal clamping voltages: 90 V (common mode),
77 V (normal mode)
Maximum Load = 40.8 X (Supply Voltage - 12.0)
(1)
(1) Without transient protection (optional).
1240
1000
750
250
0
10
12.0 Min
18.1
30
42.4
Supply Voltage (Vdc)
HART and Analog
Operating Range
4–20 mA dc
Loa
d (O
hm
s)
500
1100
Analog Only
Operating Range
Aotewell Ltd
www.aotewell.com
Industry Automation
HongKong|UK|China
+86-755-8660-6182