Emerson Fisher FIELDVUE DVC2000, Инструкция по эксплуатации

Страница: 26 / 106

DVC2000 Digital Valve Controller
July 2009 2-12
Vent
By design, the instrument exhausts supply air into the
area under the cover. The vent should be left open to
prevent pressure buildup under the cover and to drain
any moisture that may accumulate in the housing. The
control valve assembly should be installed such that
the primary vent provides gravitational draining.
If a remote vent is required, the vent line must be as
short as possible with a minimum number of bends
and elbows.
Communications Connections
A HART communicating device, such as a 375 Field
Communicator or a personal computer running
ValveLink Software communicating through a HART
modem, interfaces with the DVC2000 digital valve
controller. You can connect at any point on the 4-20
mA loop. Alternatively, convenient termination points
are located on the termination board (figure 2-15). The
instrument must be powered before digital
communication will commence.
2