Emerson Rosemount 644 - Performing a Loop Test; Loop Test with Field Communicator

3.4.5 Switch HART Revision mode
Not all systems are capable of communicating with HART
®
Revision 7
Protocol. You can configure this transmitter for either HART Revision
5 or 7 using a HART capable configuration tool.
Updated configuration menus include a HART Universal Revision
parameter that can be configured to 5 or 7 if accessible by your
system. See Table 3-1 for the Fast Key sequence.
If the HART configuration tool is not capable of communicating with
HART Revision 7, the configuration menus in Table 3-1 will not be
available. To switch the HART Universal Revision parameter from
generic mode, follow the instructions below.
Procedure
Go to Configure → Manual Setup → Device Information →
Identification → Message.
a) To change your device to HART Revision 7, enter HART7 in the
Message field.
b) To change your device to HART Revision 5, enter HART5 in the
Message field.
Note
See Table 3-1 to change HART Revision when the correct Device
Driver is loaded.
3.5
Perform a loop test
The loop test command verifies transmitter output, loop integrity,
and operation of any recorders or similar devices installed in the
loop.
3.5.1 Perform a loop test using a Field Communicator
Procedure
1. Connect an external ampere meter in series with the
transmitter loop (so the power to the transmitter goes
through the meter at some point in the loop).
2. From the Home screen, enter the Fast Key sequence.
Device dashboard Fast Keys
3, 5, 1
3. In the test loop, verify the transmitter’s actual mA output and
the HART mA reading are the same value.
If the readings do not match, either the transmitter requires
an output trim or the meter is malfunctioning.
Quick Start Guide April2023
22 Rosemount 644