18
Reference Manual
00809-0100-4860, Rev BC
Section 2: Installation
January 2013
Installation
Note
If a Smart Wireless THUM™ Adapter is being used with the Rosemount 8600 flowmeter to
exchange information via the WirelessHART protocol, an additional 2.5 Vdc is dropped in the
connected loop. This is because the THUM is wired in series with the transmitter. Please use the
following formula to calculate the maximum loop load resistor.
Loop Load Calculation: R
loop(max)
= (V
ps
– 10.8 – 2.5) / 0.024
Where:
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.
2.5 = Maximum voltage drop across the THUM wireless adapter.
0.024 = maximum transmitter current in Adc.
Analog output
The flowmeter provides a 4–20 mA dc isolated current output, linear
with the flow rate.
To make connections, remove the FIELD TERMINALS side cover of the electronics housing. All
power to the electronics is supplied over the 4–20 mA signal wiring. Connect the wires as shown
in Figure 2-13 on page 21.
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