Teledyne LXT-280 - Manual (Page 38)

Calibration LXT-280
Teledyne Analytical Instruments 28
standardize or zero adjustment). It is independent of the zero and span
adjustments for the temperature output on LXT-280 models with the
temperature output option.
Note: The tolerance of standard Teledyne TC elements is ±3°C If
greater precision is desired, contact the factory.
Procedure for trim adjust:
1. Begin with the temperature sensing element (located in the
sensor) immersed in a solution of known temperature. If the
temperature is not known, insert a precision thermometer in the
same solution and allow time for it to stabilize.
2. Magnetically activate the appropriate VERTICAL▲/▼ arrow
key to reach the Temperature Calibration Menu.
3. Position the cursor on the top line under the “T” in Trim.
4. Magnetically activate the RIGHT HORIZONTAL ► arrow key
to enter the calibrate mode. Observe the cursor move under the
last digit.
5. Position the cursor under the desired digit using the left
HORIZONTAL◄ arrow key.
6. Increase or decrease this value to make the value on the bottom
line read the same as the temperature indicated by the precision
thermometer.
Note: Make temperature adjustments slowly to allow time for the
bottom line on the display to update. This can take 5 to 7
seconds.
7. When the desired temperature value is reached, save the
calibration and exit the calibrate mode by magnetically
activating the LEFT HORIZONTAL ◄ arrow key until the
cursor is all the way to the left. The value on the top line
expresses the temperature error. The value on the bottom line
expresses the real-time process temperature.
4.11.2 Temperature Calibration—Manual TC Adjustment
The manual TC feature allows the LXT-280 to operate without a
temperature sensor only if the process temperature is known and