Teledyne LXT-280 - Manual (Page 39)

Dissolved Oxygen Transmitter Calibration
Teledyne Analytical Instruments 29
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.