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Reference Manual
00809-0100-4860, Rev BC
Section 2: Installation
January 2013
Installation
2.6.6 Wiring procedure
The signal terminals are located in a compartment of the electronics housing separate from the
flowmeter electronics. Connections for a HART-based communicator and a current test
connection are above the signal terminals. Figure 2-10 illustrates the power supply load
limitations for the flowmeter.
Note
A power disconnect is required to remove power from the transmitter for maintenance,
removal, and replacement.
Power supply
Power Supply Specifications:
Typical installations use a 22 Vdc – 28 Vdc power supply. The dc power supply should provide
clean power with less than 2% ripple. Refer to Figure 2-10 as a quick reference.
Loop resistance specification:
If HART communication is required, a minimum resistance of 250 dc is required between the
power supply and the transmitter. *Note: See the loop load calculation section to determine the
maximum allowable loop resistance as a function of power supply voltage.
Typical single loop wiring diagram:
*Loop Load Calculation: R
loop(max)
= (V
ps
– 10.8) / 0.024
Where:
R
loop(min)
= 250 . Required for HART communication.
R
loop(max)
= The maximum value the loop load resistor can be.
V
ps
= Power Supply Voltage
10.8 = minimum terminal voltage “V
terminals
” in Vdc.
0.024 = maximum transmitter current in Adc
8600
V
ps
R
loop
V
terminals