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.
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