Waters 2489, Overview And Maintenance Manual

Page: 74 / 150

June 11, 2015, 715004752 Rev. A
Page 74
4. Press Enter to enter the time.
Tip:
To advance to the Set field (Events choice list), press the
t
key.
5. Press Enter again to display the choice list, or, if you know the event number,
press the number for the event you are programming.
6. If the To field appears, enter the appropriate wavelength, in nanometers.
Requirement:
To program the same event on both channels, you must enter
two events, one for channel A and one for channel B.
7. Press A/B to set the threshold on the other channel.
Tips:
• ON A or ON B indicates the channel the event is programmed on. You can
program all events on channel A, all on channel B, or some on channel A
and some on channel B.
• Event programming is time-based, not channel-specific.
8. Press Next to advance to a new timed event.
9. To delete a timed event, press CE when the time field is active.
10. Press HOME to return to the absorbance screen, and then press Run/Stop.
11. Press Reset.
Tips:
• If the detector is under the control of an external device, the Inject Start
programmed from that device runs the method.
• If you are working in real time under current conditions (method *), when a
power failure or shutdown occurs, you lose all timed or threshold events if
you do not store them as a method. (See page 75 .)
3.2.10.5 Threshold events
You can program threshold events on channel A and channel B to control the switch
contact closure outputs: for example, when using a fraction collector. You can
program the switch to change when the programmed output (absorbance, ratio,
energy, etc.) on the detector channel A or B is above a specified threshold. Below the
specified threshold, the switch is set as shown in the table.
Table 3–12: Threshold events “Set” parameters
Number Event
1 Set switch 1
2 Set switch 2
Table 3–13: Threshold events “To” parameters
Number Set to
Below
threshold
switch state
1 On Off
2 Off On