Reference Manual
00809-0100-4021, Rev FB
August 2011
3-31
Rosemount 3144P
HAR
T
5. The communicator will ask “Are you using an active calibrator?”
a. Select “No” if a sensor is connected to the transmitter
b. Select “Yes” if using a calibration device. By selecting yes, the
transmitter will switch into active calibration mode (see “Active
Calibrator and EMF Compensation” ). This is critical if the calibrator
requires constant sensor current for calibration. If using a calibration
device that can accept pulsed current, select “No.”
6. Select the appropriate sensor trim units at the
ENTER SNSR 1 TRIM
UNITS
prompt.
7. Select
1 Lower Only, 2 Upper Only,
or
3 Lower and Upper
at the
SELECT SENSOR TRIM POINTS
prompt.
8. Adjust the calibration device to the desired trim value which must be
within the selected sensor limits. If trimming a combined sensor and
transmitter system, expose the sensor to a known temperature and allow
the temperature reading to stabilize. Use a bath, furnace, or isothermal
block, measured with a site-standard thermometer, as the known
temperature source.
9. Select
OK
once the temperature stabilizes.
10. Enter the lower or upper trim point, depending on your selection in
Step 7.
The trim functions should not be confused with the rerange functions.
Although the rerange command matches a sensor input to a 4–20 mA
output—as in conventional calibration—it does not affect the transmitter’s
interpretation of the input.
Dual Sensor Trim
1. Connect the sensor or calibration device to the transmitter.
a. When using sensors, connect the two sensors or a dual element
sensor.
b. When using a calibrator, connect the device to both sensor inputs.
2. Connect the communicator to the transmitter loop.
3. From the Home screen, select
1 Device Setup
,
2 Diag/Service
,
2 Calibration
,
1 Sensor Trim
,
1 Sensor Inp Trim
to prepare to trim the
sensor. Select
1 Sensor 1.
4. The Communicator will prompt the user to select either Sensor 1 or 2.
The sensors can be trimmed in either order, but it is recommended to
trim Sensor 1 first.
NOTE
A warning will appear “Set the Control Loop to Manual” (see “Setting the Loop
to Manual” on page 2-2.)
Aotewell Ltd
www.aotewell.com
Industry Automation
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+86-755-8660-6182
