Emerson Rosemount 3095, Справочное руководство, Страница: 44 / 130

Reference Manual
00809-0100-4716, Rev JA
May 2008
Rosemount 3095 MultiVariable
3-14
HART
Sensor Trim Procedure
1. Right-click on the transmitter icon. Select “Process Variables” to view
measured variables and determine if a sensor trim is needed (see
Figure 3-8).
2. Right-click on the transmitter icon. Select “Calibrate/Sensor Trim”
functions.
3. Click on the process variable requiring modification (DP Sens Trim,
AP Sens Trim, GP Sens Trim, or Temp Sens Trim).
4. From the calibration screen (see Figure 3-12), select the type of
calibration procedure:
a. To view the last calibration trim points for the selected process
variable, select “Display Trim,” and click “Next.” The offset and
slope trim points are displayed.
b. To fully calibrate the selected process variable, select “Trim
Sensor,” and click “Next.”
1. Read the warning message and click “Next.”
2. Select the units of measure from the drop-down menu for the
variable being calibrated, and click “Next.”
3. Select whether you want to calibrate the offset or slope (span)
point, and click “Next”. The offset trim should be done first;
then determine if a slope trim is necessary.
a. If setting the offset point for the Absolute Pressure sensor,
pull vacuum to both the low and high sides of the
transmitter, or offset trim the AP sensor using an accurate
barometer or reference sensor.
b. If setting the offset point for the DP Sensor, equalize the
high and low ports.
c. If setting the offset point for the Temperature sensor, insert
the RTD probe into an ice bath or use a verified RTD
simulator.
d. If setting the slope trim (span) for the DP sensor, apply the
desired pressure to the high side of the transmitter.
e. If setting the slope trim for the AP or GP sensor, apply the
reference pressure to the high and low side ports
simultaneously.
f. If setting the slope trim for the Temperature sensor, insert
the RTD probe into a hot oil bath or use a verified RTD
simulator.
4. Enter the new value for the offset or slope point, and click
“Next.”
5. Select “Yes” to implement the new calibration point, and click
“Next.”
6. Read the warning message, and click “Next.”
7. Click “Finish.”