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Model LXT-230 Instruction Manual / 16
Procedure:
1. Press the appropriate MENU SELECTION key to reach the Output Calibration Menu.
2. Position the cursor on the top line to change the 4 mA point or the bottom line to
change the 20 mA point.
3. Press both horizontal CALIBRATE keys simultaneously to enter the calibrate mode.
4. To change the value, position the cursor under the desired digit using the left-hand
CALIBRATE key.
5. Increase or decrease the value by pressing the appropriate vertical CALIBRATE key.
6. When the desired value is reached, file the calibration and exit the calibrate mode by
pressing either MENU SELECTION key.
6.9 Temperature Calibration - Trim Adjustment
When the process demands a tighter tolerance than ±3ºC the LXT-230 allows adjustment,
or trim, of the temperature compensation element. This adjustment only compensates for
deviations in the RTD input (as a sensor input standardize or zero adjustment).
Procedure for trim adjust:
1. Begin with the temperature sensing element (located in the sensor) in a solution of
known temperature. If the temperature is not known, insert a precision thermometer
in the same solution and allow it time to stabilize.
2. Press the appropriate MENU SELECTION key to reach the Temperature Calibration
Menu.
3. Position the cursor on the top line.
4. Press both horizontal CALIBRATE keys simultaneously to enter the calibrate mode.
Observe the cursor move under the last digit.
5. Position the cursor under the desired digit using the left-hand CALIBRATE key.
6. Dial in the difference between the displayed temperature and the actual
temperature.
NOTE
Make temperature adjustments slowly to allow time for the bottom line of the
display to update. This can take 5 to 7 seconds.
7. When the desired temperature value is reached, file the calibration and exit the
calibrate mode by pressing either MENU SELECTION key. The value on the top line
expresses the temperature error or deviation between the RTD and the precision
thermometer. The value on the bottom line expresses the real-time process
temperature.
6.10 Temperature Units Calibration - Celsius/Fahrenheit Conversion
The Temperature Calibration Menu is also used to change the units of display to either
Celsius or Fahrenheit. The change is performed as a toggle function and changes the
displayed units to the desired unit of measurement on all screens or menus where
temperature is displayed.
The following procedure describes how to use this feature.
Procedure:
1. Press the appropriate MENU SELECTION key to reach the Temperature Calibration
Menu.
2. Position the cursor on the bottom line under the "U" in Unit.
3. Press both horizontal CALIBRATE keys simultaneously. Observe the unit of
measurement change.