Emerson Rosemount 644, Reference Manual

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9
Reference Manual
00809-0200-4728, Rev RA
Section 2: Configuration
April 2015
Configuration
2.3.2 Surges/transients
The transmitter will withstand electrical transients of the energy level encountered in static
discharges or induced switching transients. However, high-energy transients, such as those
induced in wiring from nearby lightning strikes, welding, heavy electrical equipment, or
switching gears, can damage both the transmitter and the sensor. To protect against
high-energy transients, install the transmitter into a suitable connection head with the integral
transient protector, option T1. Refer to the 644 Product Data Sheet for more information.
2.4 Configuration methods
The Rosemount 644 can be configured either before or after installation. Configuring the
transmitter on the bench using either a Field Communicator, AMS Device Manager, or LOI
ensures all transmitter components are in working order prior to installation.
The 644 transmitter can be configured either on-line or off-line using a Field Communicator,
AMS Device Manager or the optional LOI (Head mount and field mount). During on-line
configuration, the transmitter is connected to a Field communicator. Data is entered in the
working register of the communicator and sent directly to the transmitter.
Off-line configuration consists of storing configuration data in a Field Communicator while it is
not connected to a transmitter. Data is stored in nonvolatile memory and can be downloaded to
the transmitter at a later time.
2.4.1 Configuring on the bench
To configure on the bench, required equipment includes a power supply, a digital multimeter
(DMM), and a Field Communicator, AMS Device Manager, or a LOI – Option M4.
Connect the equipment as shown in Figure 2-1 . Connect HART Communication leads at any
termination point in the signal loop. To ensure successful HART communication, a resistance of
at least 250 ohms must be present between the transmitter and the power supply. Connect the
Field Communicator leads to the clips behind the power (+,-) terminals on the top of the device.
Avoid exposing the transmitter electronics to the plant environment after installation by setting
all transmitter jumpers during the commissioning stage on the bench.
Set all transmitter hardware adjustments during commissioning to avoid exposing the
transmitter electronics to the plant environment after installation.