Teledyne LXT-280 - Manual (Page 37)

Dissolved Oxygen Transmitter Calibration
Teledyne Analytical Instruments 27
4.10 Locus Calibration
As stated in section 3.2.7, the locus value for Teledyne SP-1 and
SP-2 sensors is approximately -17.0°C and should not be changed
unless a different manufacturer's sensor is used. If the locus is not -17°C,
use the following procedure to define the correct locus.
Procedure:
1. Magnetically activate the appropriate VERTICAL ▲/▼ arrow
key to reach the Locus Menu.
2. Magnetically activate RIGHT HORIZONTAL ► arrow key to
enter the calibrate mode. Observe the cursor move to the last
digit on the right.
3. Using the HORIZONTAL ◄► arrow keys, position the cursor
under the digit to be adjusted.
4. Increase or decrease the value by Magnetically activating the
appropriate VERTICAL ▲/▼ arrow key.
5. To file the locus value and exit the calibrate mode, Magnetically
activate the LEFT HORIZONTAL ◄ arrow key until the cursor
is all the way to the left.
4.11 Temperature Calibration
The Temperature Calibration screen is used to:
1. Adjust the temperature to coincide with measuring device
2. Toggle temperature units between °C and °F
4.11.1 Temperature Adjustment
When the process demands a tighter tolerance than ±3°C of the
temperature input, the LXT-280 allows adjustment, or trim, for
variations in the temperature compensation element. This adjustment
only compensates for deviations in the RTD input (as a sensor input
Locus -17°C