Teledyne LXT-220 Operation

Dissolved Oxygen Controller Operation

Teledyne Analytical Instruments 23

Operation

No one instrument has all the options described in this document.

Some options must be specified at the time the instrument is purchased,

and are not field-alterable. The instrument can be returned to the factory

for re-programming if your requirements change.

Cursor positions or numeric adjustments are performed by pressing

the appropriate keypad. The LXT-220 uses an "underscore" cursor in

each of the menus. Holding down the keypad will automatically scroll

the cursor or numeric values.

Note: Simultaneous pressing both vertical keys or any

combination of keys other than the two horizontal

CALIBRATE keys is not recommended.

3.1.1 Menu Selection Keys

The MENU SELECTION keys are used to:

1. Change the display menu and move the cursor vertically. Any

menu can be accessed by the use of the appropriate up or down

MENU SELECTION key.

2. Exit the calibration mode and save calibration data.

3.1.2 Calibrate Keys

1. The horizontal CALIBRATE keys are used to enter the calibrate

mode and move the cursor horizontally. To enter the calibrate

mode, both horizontal CALIBRATE keys must be pressed

simultaneously.

2. Once in the calibrate mode, the cursor can be positioned by

pressing the individual right-hand or left-hand horizontal

CALIBRATE keys.