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<7. HART Communication>
7-17
IM 01C25W05-01EN
7.2.3.14 Signal Characterizer Setup
This feature performs signal characterizer
calculation for differential pressure percentage
values and outputs the result. This is used to obtain
linear output in liquid level measurement of irregular
shaped tanks. The coordinates of up to 30 points
can be set in the range or 0 to 100%. Confirm that
parameter “Xfer fnctn” is set to “Linear” or “Sq root”
when you set coordinates.
Set this to “Spcl curve” when you finish setting the
coordinates to apply signal characterizer to the
output.
Note that in the following conditions, the transmitter
rejects the application of this function.
• When the X-Y coordinates of the setpoints are
not increasing linearly
F0710.ai
Y
X
100% 0%
100%
Input
Output
Input pressure
(%)
Signal
characterized value
To set the signal characterizer function, follow the
procedure below.
1. Set the setpoint coordinates.
• Recalling the parameter for the number of
coordinates (Num of points)
Recall
parameters
[Root menu] → Detailed setup →
Signal condition → S.C.menu →
Num of points Set the number of setpoints (0 to 30).
Set the number of setpoints in the range of 0 to
30 using the Num of points parameter.
2. Set the coordinate value
• Recalling the coordinate setting parameter (XY
values).
Recall
parameters
[Root menu] → Detailed setup →
Signal condition → S.C.menu → XY
values →
X1 to X30
Y1 to Y30
Set the X and Y coordinate values
Enter the values to assign to the X and Y
coordinates using the Point setting parameter.
3. Apply the signal characterizer function
After setting the coordinate values, setting
parameter “Xfer fnctn” to “Spcl curve” enables
the signal characterizer and disables the
changing of data.
• Recalling the signal characterizer parameter
(Xfer fnctn)
Recall
parameters
[Root menu] → Detailed setup →
Signal condition
Xfer fnctn Select Spcl curve.
Select Spcl curve with the Xfer fnctn parameter.
The factory default setting is Linear or Sq root.
NOTE
By selecting [Device]→[Additional
Functions]→[Signal Characterization] at DTM
menu bar, you can reach the following setting
screen to set the coordinate values which
corresponds to the shape of the tank.
1. Select Online(set the coordinate value in the
transmitter) or Offline (make a data file of
coordinate values).
2. Select input mode from “UI mode” in which
you can follow the user interface according
to the tank shape and automatically generate
the coordinate values or “User defined
mode” in which you can manually input
coordinate values.
3. In case of UI mode, select tank shape in the
first screen, and enter the parameters for
each part of the tank in the next screen. By
pushing [Calculate] button, the coordinate
values will be generated.
4. A graph and the table of coordinate values
will be shown. You can edit the valuee in
the table. In UI mode, you can change the
number of the setpoints and re-caluculate it.
Download the data to the transmitter or the
data base with [apply] button. Save it in the
file by [Exports as CSV] button.