27
Reference Manual
00809-0300-4750, Rev CA
Quick Installation and Start-Up
March 2016
Quick Installation and Start-Up
Figure 2-27. Field Mount Transmitter Analog Loop Load Limitations
R
max
= 31.25 (V
ps
— 10.8)
V
ps
= Power supply voltage (Volts)
R
max
= Maximum loop resistance (Ohms)
Wall mount transmitter
The analog output signal is a 4—20mA current loop. The loop can be powered internally or
externally via a hardware switch. The switch is set to internal power when shipped from the
factory.
For HART Communication a minimum resistance of 250 ohms is required. It is
recommended to use individually shielded twisted pair cable. The minimum conductor size
is 0.51 mm diameter (number 24 AWG) for cable runs less than 5,000 ft. (1,500 m) and
0.81 mm diameter (number 20 AWG) for longer distances.
Internal power
The 4—20mA analog signal is a 24 VDC active output.
Maximum allowable loop resistance is 500 ohms.
External power
The 4—20 mA analog signal is powered from an external power source. HART multidrop
installations require a 10—30 VDC external analog power source.
Figure 2-28. Wall Mount Transmitter Analog Wiring
A. +4–20 mA
B. -4–20 mA
600
400
200
0
10.8
30
Operating
region
Power supply (Volts)
Load (Ohms)
A B
Summary of Contents for Rosemount 8750W
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Page 168: ...156 Reference Manual 00809 0300 4750 Rev CA Maintenance March 2016 Maintenance ...
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