HF scientific AccUView Wastewater UV %Transmission Monitor - Manual (Page 16)

4.0 Operation
This process monitor allows for the measurement of the transmission of process water on-
line. Process water is usually reported in units of %T. Readings above 102 %T are
indicated by a flashing display. Readings above 100 %T indicate that the current sample is
better than the calibration water. Readings above 102 %T will cause an alarm condition to
occur where the relay will change to the alarm condition and the 4-20 mA will change to 2
mA. Readings above 110 %T are not possible. All readings are mathematically path length
corrected to 1cm.
The AccUView Wastewater has an internal pump to draw sample water from a stream. To
extend system life and reduce maintenance it operates in a cycle. In the default cycle, the
pump runs for five minutes every 30 minutes. After the pump stops, the system waits for
the sample to degas then takes a reading. The reading will only be updated once every
cycle.
4.1 Modes of Operation
There are four operational modes,
AUTO, CAL, CONFIG and SVC. All modes can be
accessed by sequentially pushing the
MODE/EXIT key.
Note: Before entering AUTO mode, the lower portion of the screen will alternate between
AUTO and ↵. This is a pre-Auto condition indicating that the ↵ button must be
pushed before normal operation can begin. The pump will start after the ↵ button is
pushed as all timers are reset.
During normal operation, the instrument will have the arrow beside
AUTO (automatic
operation) and
AUTO will be flashing. The scale (%T) is displayed on the lower row of
the display and the measured reading on the upper row of the display (see illustration
below). The flashing
AUTO indicates that the ultrasonic cleaning is operating correctly.
In this mode the pump will cycle and readings will be taken.
During calibrations the CAL (calibration) mode will be used. This mode is indicated by an
arrow beside the
CAL. See section 5.0 Instrument Calibration.
The
CONFIG (configurations) mode is used to change operation of the instrument, or
alter the outputs. This mode is indicated by an arrow next to CONFIG on the LCD. See
section
7.0 Instrument Configuration (CONFIG mode).
The last operation mode is
SVC (service) mode which is used when it is not desired for
the pump to operate. This mode can be used to perform various maintenance procedures.
AccUView Wastewater (1/09) 10
Rev. 2.9