Emerson Rosemount 8800D Series Quick Start Manual page 20

Quick Start Guide
3. For HART installations utilizing the pulse output, connect the positive
lead to the "+" terminal of the pulse output and the negative lead to
the "−" terminal of the pulse output as shown in
5 to 30 Vdc power supply is required for the pulse output. Maximum
switching current for the pulse output is 120 mA.
Do not connect the powered signal wiring to the test terminals. Power
could damage the test diode in the test connection. Twisted pairs are
required to minimize noise pick up in the 4–20 mA signal and digital
communication signal. For high EMI/RFI environments, shielded signal
wire is required and preferred in all other installations. Use 24 AWG or
larger wire and do not exceed 5,000 feet (1,500 meters). For ambient
temperatures above 140 °F (60 °C) use wire rated to 176 °F (80 °C) or
higher.
Figure 5-3
a transmitter and enable communications with a hand-held Field
Communicator.
Figure 5-5
with Foundation fieldbus.
4. Plug and seal unused conduit connections. Use pipe sealing tape or
paste on threads to ensure a moisture-tight seal. Housing conduit
entries marked with M20 will require M20 x 1.5 blanking plug thread.
Unmarked conduit entries will require a ½–14 NPT blanking plug
thread.
Note
Straight threads require a minimum of three wraps of tape to obtain a
tight seal.
5. If applicable, install wiring with a drip loop. Arrange the drip loop so
the bottom is lower than the conduit connections and the flowmeter
housing.
Note
Installation of the transient protection terminal block does not provide
transient protection unless the transmitter case is properly grounded.
Flowmeters ordered with painted meter body may be subject to
electrostatic discharge. To avoid electrostatic charge build-up, do not
rub the meter body with a dry cloth or clean with solvents.
20
CAUTION
and Figure 5-4
shows wiring connections necessary to power a transmitter
CAUTION
show wiring connections necessary to power
™
Rosemount
October 2018
Figure 5-4. A separate
8800D Series Vortex Flowmeter