The next screen gives the user
a choice to set the 4mA or 20mA values or to Exit the procedure. Here the user will select the 4mA menu position.
The HART Communicator requests the user to set the Level (or Interface) to the position that is to provide the 4mA loop current output. When that has been done, the user must press OK to continue with the procedure.
The HART Communicator then requests a measurement reading from the transmitter indicating the digital value at this range position. The user then has the option of setting this value as the lower range value, getting an update of the digital reading from the transmitter or leaving the 4mA range point as it was.
If the user accepts the measurement value as the 4mA loop current point, the HART Communicator issues the command changing the LRV and when the transmitter replies, returns to the Set screen.
If the user desires to change the 20mA measurement value, he selects the 20mA menu option and must press ENTER to continue the procedure.
The HART Communicator requests the user to set the Level (or Interface) to the position that is to provide the 20mA loop current output. When that has been done, the user must press OK to continue with the procedure.
The HART Communicator then requests a measurement reading from the transmitter indicating the digital value at this range position. The user then has the option of setting this value as the upper range value, getting an update of the digital reading from the transmitter or leaving the 20mA range point as it was.
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If the user accepts the measurement value as the 20mA loop current point, the HART Communicator issues the command changing the URV and when the transmitter replies, returns to the Set screen
When the user desires to leave the Apply values procedure, he must select the Exit menu entry.
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 Rerange screen.
Detailed Setup Selections
In the Overview section, it was shown that if the user selects the Detailed setup menu from the Device setup screen, the following screen presents the following selection of menus to the user.
If the user selects Sensors from the Detailed setup screen, he may edit the Unit code for Level/Interface or edit the units code for Temperature. The third option is a menu Sensor Trim that gives the user additional selections.
If the user selects Sensor Trim from the Sensors menu, calibration procedure options are presented. If the transmitter is not configured for Temperature, the Zero Temper Trim and Full Temper Trim options will not be presented. The description of these procedures is given in the previous section on Calibration.
If the user selects Signal Condition from the Detailed setup screen, he is presented with three additional selections. The Keypad rerange and Apply values procedures are presented in the Rerange section. The third option allows the user to modify the Level/Interface damping factor.