Advanced features Chapter 9
Mastersizer 2000 Page 9-11
4. Decide if the size classes are to be spaced logarithmically or linearly by check-
ing the relevant radio button under Spacing.
5. Press the Generate sizes now button.
The size classes generated can be edited or saved by selecting the Edit Sizes tab.
Alarms
The user can set three alarms that monitor various states of the measurements.
These are the cleanliness alarm, alignment alarm and diameter alarms.
Cleanliness alarms
The software can monitor the cleanliness of the optics by measuring the back-
ground signal while clean dispersant is circulating. The measurement procedure
can be set up so that the user sets a threshold and an alarm is automatically triggered
if this threshold is passed. As an alternative, the background screen can be displayed
during the measurement for the user to make a judgment on the cleanliness of the
system.
To set a Cleanliness alarm in a manual measurement:
1. Select Measure-Manual.
2. Once the background measurements are complete, press the Options button.
3. Select the Measurement tab.
4. Select Alarms.
5. Select the Enable check box to enable the cleanliness alarm.
6. Move the slider on the Cleanliness level to set the sensitivity of the alarm.
To set a Cleanliness alarm in an SOP measurement:
1. Select the Measurement dialogue.
2. Select the Alarms button in the Advanced options section. There are four
options for the actual alarm on the Cleanliness Alarms tab:
No cleanliness alarm – the alarm is disabled.
Check cleanliness level – the threshold is automatically monitored and
an alarm is triggered if the threshold is exceeded. Select this and use the
Cleanliness level slider to set the threshold for the alarm trigger.
Display background (exited by key press) – a display appears, showing
the background signal. This display disappears when any key is pressed.
MAN0384-1.0 Mastersizer 2000.book Page 11 Tuesday, March 20, 2007 8:56 AM
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