Quick Installation Guide
00825-0100-4004, Rev DB
December 2011
Rosemount 8800D
9
S
TEP
4: C
ONNECT
W
IRING
AND
P
OWER
U
P
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 11. Load Limitation
Maximum Loop Resistance = 41.7 (Power Supply Voltage - 10.8)
The Field Communicator requires a minimum loop resistance of 250
F
OUNDATION
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.
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.
Figure 12. Proper Conduit Installation with Rosemount 8800D
Power Supply (Volts)
Operating
Region
1250
1000
500
0
10.8
42
Load (O
hms)
Conduit Line
Conduit Line
4004_RevDB.fm Page 9 Wednesday, November 23, 2011 3:06 PM
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