Waters 2489, Overview And Maintenance Manual

Page: 72 / 150

June 11, 2015, 715004752 Rev. A
Page 72
3. In the Data out field, press 5, MaxPlot A,B.
4. Press Enter to select the MaxPlot function.
5. Return to the absorbance screen by pressing the HOME key.
3.2.10.3 Programming timed events, threshold events, and methods
You can retrieve as many as five methods, which the detector references as numbers
1 to 5. An asterisk in the method number icon (see the table on page 49 ) tells you the
current conditions are not stored. If you are using a stored method, the method
number appears on the absorbance screen.
If you edit a parameter such as wavelength or AUFS, you are editing the current
conditions (Method *), which can be stored as a method. You can store the method in
one of the 10 available method storage slots, or you can replace the current method
with one of the methods previously stored. When you recall a previously stored
method, you replace the existing method conditions with those of the stored method.
The method number displayed in the absorbance screen is that of the retrieved
method until you make a change. Any parameter change (for example, wavelength or
AUFS) alters the current conditions so that the original recalled method is no longer in
effect, causing the method number to change to an asterisk.
The operating parameters at the time of system shutdown are restored; however, any
timed events or thresholds associated with the method are deactivated when power is
restored. On startup, you always see an asterisk inside the method icon on the
absorbance screen.
When the detector is operating under remote control—that is, control by Empower or
MassLynx software—the remote icon incorporating the letter “E” (for Ethernet)
appears (see the table on page 49 ).
3.2.10.4 Timed events
You can program as many as 50 timed events, to the nearest 0.01 minutes. As you
enter timed events, each new event appends to the end of the timed-event list. If you
enter a time that is not in sequence with the events entered previously, the
timed-event list sorts automatically when you press Next. The detector allows
programming of the timed events shown in the table below.
Note:
Changing the sensitivity (AUFS) setting affects the 2-V output. For example,
1 AU gives 0.5 AU/V, and 2 AU gives 1 AU/V.
Table 3–3: Timed event parameters
Number Event Units Range or default
Specify
channel
1 Wavelength nm 190 to 700 Yes
2 Filter time
constant
Seconds 0: Disable filter
λ:
0.0125 to 5.00
λλ:
0.5 to 5.0
Yes
3 Sensitivity AUFS 0.0001 to 4.0000 Yes