Waters 2489, Overview And Maintenance Manual

Page: 49 / 150

June 11, 2015, 715004752 Rev. A
Page 49
3.2 Using the operator interface
3.2.1 Using the display
The detector employs a 128
×
64-bitmap graphic display and a 24-key membrane
keypad for the operator interface. After the startup diagnostic tests are run
successfully, the detector displays the absorbance, or HOME, screen.
Figure 3–3: Detector absorbance (HOME) screen
You can recall the absorbance screen at any time by pressing the HOME key. When
you first use the detector, the absorbance screen shows the factory-set defaults.
Afterward, the absorbance screen shows the settings displayed before the detector
was last powered-off. The absorbance screen continues to change as the run
continues.
The detector monitors absorbance of one or two wavelengths in real time while
allowing you to modify all the parameters discussed in the table below. You can use
the A/B key to toggle between absorbance screens for channels A and B.
3.2.1.1 Absorbance and message icons
The absorbance screens and message screens in the detector program display the
icons or fields shown in the figure on page 49 and described in the table below. For a
list of ranges and defaults for the function icons, AUs, and fields described in this
table, see the table titled “Primary and secondary function (method) parameters” on
page 61 .
Note:
Changing the sensitivity (AU) setting affects the 2-V output. For example,
1 AU gives 0.5 AU/V, and 2 AU gives 1 AU/V.
Table 3–2: Absorbance and message screen icons
Icon or
field
Icon/field name Function
Field
requiring
entry
Sensitivity or AU Selects the chart sensitivity, in
absorbance units (AU), for the selected
channel (Ethernet signal is not affected).
Absorbance Lamp on/off Shift on/off
Channel selector
Wavelength
Sensitivity
Next
Single/dual-wavelength
Keypad lock/unlock
Local (method #)/Remote control
Run time (minutes)
Sticky diagnostic test on/off