Starting at the Calibration
screen, select the Zero Level
Trim procedure. This procedure
trims the Level digital value
measurement at the position that
the user desires to be the zero
reference position.
If the user selects Zero Level
Trim from the Calibration 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.
This screen warns the user that
proceeding will affect the sensor
calibration. The user must press
OK when ready to proceed
The HART Communicator now
requests that the level float be set
to the desired zero level trim point.
When the float is at this position,
the transmitter will always report 0
in the user chosen units. The user
must press OK when the float is at
that position.
Zero Level Trim
The transmitter will take several
seconds to insure that the level
signal has stabilized. Once
the measurement is stable, the
procedure will continue without
user intervention. The HART
communicator will then send
the command to the transmitter
to calculate the new Level zero
calibration constant.
When the transmitter has
completed its calculation it will reply
to the HART Communicator. Then
the HART Communicator will inform
the user that the zero level point
has been trimmed.
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
Calibration screen.
The HART Communicator is now
at the starting screen for the Zero
Level Trim.
Full Level Trim
Starting at the Calibration
screen, select the Full Level Trim
procedure. This procedure trims
the Level digital value measurement
at two points. The first point is the
position that the user desires to be
the zero reference position. The
second point is a Level position
near the end of the sensor.
If the user selects Full Level Trim
from the Calibration 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.
This screen warns the user that
proceeding will affect the sensor
calibration. The user must press
OK when ready to proceed.
The HART Communicator now
requests that the level float be set
to the desired zero level trim point.
When the float is at this position,
the transmitter will always report 0
in the user chosen units. The user
must press OK when the float is at
that position.
The transmitter will take several
seconds to insure that the level
signal has stabilized. Once
the measurement is stable, the
procedure will continue without
user intervention. The HART
communicator will then send
the command to the transmitter
to calculate the new Level zero
calibration constant.
When the transmitter has
completed its calculation it will reply
to the HART Communicator. Then
the HART Communicator will inform
the user that the zero level point
has been trimmed.
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