VPT10-H
HART
®
PRESSURE TRANSMITTER
INSTALLATION, OPERATION, CONFIGURATION AND MAINTENANCE MANUAL
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23
User Table (Characterization Curve)
Used for level, volume, or any other measurement that requires custom output. VPT10-H has a user table with 16
points with input and output as a percentage (depending on the PV%, which may be Pressure or Flow, as a percentage
of the specific Working Range).
User must set up at least two points in the table. The points will define the characterization curve to be used to calculate
the PV% to be converted to 4-20 mA.
It is recommended to select equally distributed points over the desired curve or over a part of the curve where better
precision is required. The table should be monotonically increasing, ie all points in increasing order of x, as in the
example of the following figure.
For measuring volume, mass or level, user can select a specific unit with its respective range, on the “Special Unit”
menu from “Pressure Sensor” directory.
Figure 3.11 – User table.
Trim –
In this directory user can adjust the pressure sensor (calibration of lower and upper points, zero point), the
output current (4 mA and 20 mA) and the temperature sensor. Figure 3.12 shows the connection of the multimeter with
the transmitter for current trim. See further details in item 3.7, below.
For any calibration procedure user can use the Restore option on “Maintenance” menu, which restores all sensor data,
including factory calibration data, in case of any problem during process.
NOTE
VPT10-H intelligent pressure transmitter is factory calibrated before shipment to the customer. If it is
necessary to recalibrate this transmitter in the field, be sure to use a calibrator at least three times more
accurate than the specifications.
NOTE
After installation, it is recommended to zero the transmitter, since the zero point may change due to the
mounting position and the sensor.
Index x_Value y_Value
1
2
3
4
...
n
y1
y2
y3
y4
...
yn
x1
x2
x3
x4
...
xn
...
x1 x2 x3 x4 xn-1 xn
x_Value
y_Value
yn
yn-1
y4
y3
y2
y1
x1 x2 x3 x4 ... xn
y1 y2 y3 y4 ... yn
Tab_
x_Value
y_Value