The HART Communicator will
display this screen reminding
the user that the loop should be
removed from automatic control
before proceeding. When this has
been done, the user must press OK
to continue.
The user is then notified that
the loop may now be returned
to automatic control. After the
user presses OK the HART
Communicator returns to the
Keypad rerange screen.
If the user has changed the unit
code, he may then modify the range
values. He selects the variable that
he desires to change by using the
left arrow on the highlighted line.
If the user selects LRV from the
Keypad rerange screen, the present
LRV is displayed above the edit
box, 0.00 in as shown to the left.
In this example, the user desires
to change the LRV to 10.0 in and
must press ENTER after changing
the edit box to continue with the
reranging of the transmitter.
The Keypad rerange screen now
shows the new value selected
by the user, but the HART
Communicator has not sent the
command to the transmitter. Note
the SEND label above F2 that
indicates the need to send the value
to the transmitter.
If the user selects URV from the
Keypad rerange screen, the present
URV is displayed above the edit
box, 60.00 in as shown to the left.
In this example, the user desires
to change the URV to 55.0 in and
must press ENTER after changing
the edit box to continue with the
reranging of the transmitter.
On returning to the Keypad rerange
screen, the values shown for LRV
and URV are the changes that the
user has made. The user should
check the difference between the
URV and LRV and compare this
value with the Min span listed
on the menu. If the difference is
smaller than the minimum span, the
transmitter will not accept the new
range values. Note that the label
above F2 is now SEND. The user
must press the SEND key for the
HART Communicator to send the
new range values to the transmitter.
The HART Communicator will
display this screen reminding
the user that the loop should be
removed from automatic control
before proceeding. When this has
been done, the user must press OK
to continue.
The user is then notified that
the loop may now be returned
to automatic control. After the
user presses OK the HART
Communicator returns to the
Keypad rerange screen.
The keypad rerange screen now
shows the new LRV, URV and Unit
selected by the user.
Reranging the Transmitter
Setting the Measurement Value for 4mA and 20mA
by Apply Values
If the user desires to set the 4mA
and 20mA measurement points by
setting the Level (or Interface) value
in the vessel, he must select Apply
values from the Rerange screen.
If the user selects Apply values from
the Rerange screen, this screen
will appear reminding the user
that the loop should be removed
from automatic control before
proceeding. When this has been
done, the user must press OK to
continue.
16
