Teledyne LXT-220 - Manual (Page 26)

Operation LXT-220 DO
Teledyne Analytical Instruments 26
2 DO 8.40
84.0%
25.0 O C
1 DO 9.28
92.8%
25.0 O C
Main Menu, pH
2 ORP 500
50.0%
25.0 O C
Main Menu, ORP
Procedure:
1. Press the upper MENU SELECTION key to reach the Contrast
Menu.
2. Press both horizontal CALIBRATE keys simultaneously to enter
the calibrate mode. Observe the cursor move to the last digit.
3. Using the horizontal CALIBRATE keys, position the cursor
under the digit to be adjusted.
4. Increase or decrease the value by pressing the appropriate
vertical CALIBRATE key.
5. To save the contrast value and exit the calibrate mode, press
either MENU SELECTION key.
3.2.2 Main Menu
This menu appears after the copyright display when power is first
applied to the LXT-220. The MAIN MENU displays the measured
process variable, temperature, and the current output in percent of full-
scale. While in this menu, the current output can be adjusted and locked
in a manual mode to provide an undisturbed output during sensor
calibrations. The screens below are for a two-channel instrument. To
access the following menus in a two-channel instrument scroll down for
channel 1 and scroll up for channel 2. For a single channel instrument
scrolling down accesses all menus.
3.2.3 Output Graph
This screen graphically displays the output current that is set up in
the Main screen. The X-axis of the graph display is factory set to ~150
samples (~15min @ 6 sec or .1min/sample). The setup screen sets the
Y-axis (the sensitivity). If the graph were assigned to a current output
the sensitivity would be that of the 4 to 20 mA output.