5 Connect wiring and power up
5.1 Power supply (HART)
The dc power supply should provide power with less than two percent ripple.
The total resistance load is the sum of the resistance of the signal leads and
the load resistance of the controller, indicator, and related pieces. Note that
the resistance of intrinsic safety barriers, if used, must be included.
Figure 5-1: Load limitation
C
A
B
B
D
1500
1250
1000
750
500
250
0
10.8 16.8 22.8 28.8 34.8 42
A. Rloop in ohms
B. Power supply voltage
Maximum Loop Resistance = 41.7 (Power Supply Voltage - 10.8) The Field
Communicator requires a minimum loop resistance of 250 ohms.
5.2
Power supply (Foundation fieldbus)
The flowmeter requires 9-32 Vdc at the power terminals. Each fieldbus power
supply requires a power conditioner to decouple the power supply output
from the fieldbus wiring segment.
5.3
Conduit installation
Prevent condensation in any conduit from flowing into the housing by
mounting the flowmeter at a high point in the conduit run. If the flowmeter is
mounted at a low point in the conduit run, the terminal compartment could
fill with fluid.
If the conduit originates above the flowmeter, route conduit below the
flowmeter before entry. In some cases a drain seal may need to be installed.
Quick Start Guide October 2018
16 Rosemount
™
8800D Series Vortex Flowmeter
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