Teledyne LXT-280 User Manual

Page 39

Dissolved Oxygen Transmitter

Calibration

Teledyne Analytical Instruments

constant. This adjustment also applies should the TC element in the
sensor fail to either an open or shorted condition.
Procedure to adjust manual TC:

1. Place a 3,000 ohm, 1% resistor across terminals TB1-2 and TB1-

5 in place of the sensor wires on the LXT-280 transmitter.

2. Magnetically activate the appropriate VERTICAL ▲/▼ arrow

key to reach the Temperature Calibration Menu.

3. Position the cursor on the top line.
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 with the VERTICAL ▲/▼ arrow

keys to make the value on the bottom line read the process
temperature.

Note: Make temperature adjustments slowly to allow time for the

bottom line on the display to update. This can take 5 to 7
seconds.

4.11.3 Temperature Units Calibration – °C/°F Conversion

The Temperature Calibration screen is also used to change the units

of display to either Celsius or Fahrenheit. The displayed temperature is
converted as the units are toggled from one unit to the other. Changes in
the displayed units are automatically made on all screens or menus
where temperature is displayed. The following procedure describes how
to use this feature.
Procedure:

1. Magnetically activate the appropriate VERTICAL▲/▼ arrow

key to reach the Temperature Calibration Menu.

2. Position the cursor on the bottom line under the “U” in Unit.
3. Magnetically activate the RIGHT HORIZONTAL ► arrow key.

Observe the unit of measurement change.

4. To toggle back to the first unit of measurement, magnetically

activate the RIGHT HORIZONTAL ► arrow key again.