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Chapter 3
The following indicators on the Errors tab illuminate if an error condition has
been detected.
These indicators give the current status of the pump and ultrasonic probe. If this
indicator shows green then the pump or ultrasonic probe are currently in use. If the
Ultrasonics indicator is greyed out then the unit does not have the ultrasonic
option installed.
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Error indicators
Connection box disconnected – shows red if the control cable from the
control unit to the cell unit is not connected.
Dispersant Temperature Probe – shows red if the temperature is outside
the range 10°C - 35°C or there is an internal error with the temperature sensor.
Contact a Malvern representative if this error condition persists.
Drain Valve – illuminates if the drain valve has failed to drive (i.e. it has stuck
open or closed). This may be caused by leaving a sample in the cell for long
periods - this may have set and bonded the drain valve. Never leave the sample
in the cell for long periods - always flush the cell with clean dispersant. Contact
a Malvern representative if this error indicator illuminates.
Pump – illuminates if there is a problem with the pump controller electronics
Pump over temperature – illuminates if the pump is over its operating tem-
perature range. The pump will stop until its temperature returns to the operat-
ing range. The pump will typically overheat if the sample dispersant is too
viscous or the sample material is too large, causing jamming.
Pump speed control – illuminates if the difference between the speed
demanded and the actual speed exceeds 500rpm for over 10 seconds.
Ultrasound – illuminates if there is an error with the ultrasound control elec-
tronics.
Ultrasound displacement – illuminates if the current supplied to drive the
ultrasound probe is too high.
Ultrasound timeout – illuminates if the ultrasound is left on for over 15
minutes.
Status indicators
Software features
MAN 0389
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