Principle Of Operation - Emerson Fisher 4320 Instruction Manual

4320 Wireless Position Monitor
ENTER ALERT TRIGGER VALUE
ALERT
SETUP
CONFIGURE
Figure 20. Setting the Cycle Counter in AMS Wireless
Configurator and AMS Device Manager
To clear accumulated cycle value select Reset Cycle
Counter.
D Power status indicates the status of the power
module voltage.
Field Communicator
Select Online, Service Tools, Variables, then Power
Module Voltage. to view the power status. Refer to
the Service Tools menu tree shown in figure 17.
AMS Wireless Configurator or AMS Device
Manager
Go to Service Tools to view the power module
voltage status on the Variable tab. Refer to figure 21.
The 4320 wireless position monitor
also includes a power module voltage
warning and a critical power failure
alert. These can be viewed through the
1420 gateways web interface. Look
under Monitor then Point Data and
select your device from the available
HART tags.
There are two field (true or false) that
can be mapped into Modbus, OPC, or
DeltaV:
D TAG.BATTERY WARNING
GETTING LOW and
D TAG.CRITICAL POWER FAILURE
20
RESET CYCLE
COUNTER
APPLY
Note
VARIABLES TAB
VARIABLES
SERVICE TOOLS
Figure 21. Power Status in AMS Wireless Configurator and
AMS Device Manager

Principle of Operation

The basic concept of the electronic positioner can be
understood by visualizing a magnet mounted to a
piece of equipment that either has a rotating motion
or sliding linear movement. The device has the
ability to detect position of the magnet and transmit
wirelessly the relative position. The 4320 wireless
position monitor is similar to a wired position
transmitter on a valve but without wires.
The 4320 is a communicating micro−processor
based instrument that includes the use of a Hall
sensor to detect the relative position (or percent of
span) of a magnet that is attached to equipment
(e.g. process control valve; either automated or
manual). The 4320 is a battery powered device with
the power modules located on the inside of the
device. The primary means of communication is
wireless, conforming to the WirelessHART
communications standards. The device also
supports wired communication using the HART
protocol to connect to a handheld device, such as
the 475 or 375 Field Communicator. The handheld
connection is used for initial device configuration (i.e.
network set−up). The device includes a local user
interface (LCD display and two pushbuttons)
primarily used to calibrate or define the span of
position being measured. No ground point is
required. The device contains an integrated
omni−directional antenna.
Instruction Manual
October 2009
POWER
MODULE
VOLTAGE