Emerson Rosemount Apex, Reference Manual

Page: 65 / 124

Reference Manual
00809-0100-4731, Rev FA
April 2003
3-15
APEX
™
and APEX Sentry
™
Radar Gauge
Exiting the Main Menu
To save the configuration information and exit the main menu:
1. Make sure the “Save Changes” message is displayed
(press UP or DOWN if necessary).
2. Press ENTER.
To make additional changes, press UP or DOWN to display the message
“Continue.”
• Press ENTER if you want to repeat the steps for changing each of the
variables and configuration options.
or
• To go to a specific option, continue pressing ENTER until you reach the
option you want to change.
To discard the configuration changes:
1. Press UP or DOWN to display the message “Abort.”
2. Press ENTER.
MODEL 275 HART
COMMUNICATION
OPTION
Commissioning on the
Bench With HART
Commissioning consists of testing the transmitter and verifying transmitter
configuration data. The APEX and APEX Sentry Radar Gauge can be
commissioned either before or after installation. Commissioning the
transmitter on the bench before installation using a Model 275 HART
Communicator or AMS ensures that all transmitter components are in working
order.
To commission on the bench, connect the transmitter and the HART
Communicator. Make sure the instruments in the loop are installed according
to intrinsically-safe or nonincendive field wiring practices before connecting a
communication in an explosive atmosphere. Connect HART Communicator
leads at any termination point in the signal loop. For convenience, connect
them to the terminals labeled “COMM” on the terminal block. Connecting
across the “TEST” terminals will prevent successful communication. Avoid
exposing the transmitter electronics to the plant environment after installation
by setting all transmitter jumpers during the commissioning stage on the
bench.
For 4–20 mA transmitters, the power supply must provide 10.5 to 42.4 V dc at
the transmitter, and a meter to measure output current. To enable
communication, a resistance of at least 250 ohms must be present between
the HART Communicator loop connection and the power supply. Do not use
inductive-based transient protectors with the APEX and APEX Sentry Radar
Gauge.
When using a HART Communicator, any configuration changes made must
be sent to the transmitter by using the “Send” key (F2). AMS configuration
changes are implemented when the “Apply” button is clicked.
For more information on the Model 275 HART Communicator see document
00275-8026-0002.