Malvern Instruments Spraytec, User Manual

Page: 162 / 221

Optical alarms
The optical alarm types are as follows:
.
Min Transmission signal – a measurement falling below the specified
minimum transmission may mean that the optical windows are too dirty to
make accurate measurements, or that the detector is badly aligned. This
alarm is triggered when transmission falls below the values entered.
The detected signals should be minimal if the windows are clean and
there’s no sample in the measurement zone. If this alarm occurs clean the
windows.
.
Avg scattering signal – this alarm occurs when the average scattering
across all active detectors is greater than the threshold levels set. This indi-
cates that the optics are dirty or that there was spray in the measurement
zone during the background measurement.
.
Peak scattering signal – this alarm is triggered when any detector reaches
the set level during background measurement. This indicates that the optics
are dirty or that there was spray in the measurement zone during the back-
ground measurement.
C H A P T E R 1 0
S p r a y t e c
P a g e 1 0 . 1 0
M A N 0 3 6 8