ABB ScreenMaster RVG200 Operating Instructions Manual page 108

ScreenMaster RVG200
Paperless recorder
Note. The following parameters are applicable only to analog totalizers.
Count rate/Cut off
Count rate
Cut off
106
Set the required totalizer count rate (if necessary) and cut off value.
Note. If the recorder holds the relationship data between the selected
engineering range unit of measurement (see page 92) and the selected
totalizer units (see page 103), the totalizer count rate is calculated and
displayed automatically.
The count rate is determined by the maximum number of engineering
units (or pulses) per second and the smallest totalizer increment:
engineering full scale value (rate)
------------------------------------------------------------------------- -
engineering units (in seconds)
Example – to totalize a flow with a maximum rate of 2500 liters / minute
3
(= 2.5m / minute) to the nearest 0.1m
3
150m /hour
-------------------------------- -
3600 seconds
The resulting value must be within the range 0.00001 to 99.99999. The
totalizer increment is determined by the number of decimal places in the
value – see page 104.
Predetermined count
Input signal
3
m /hr
The totalizer pulse rate is
proportional to the input signal.
At this point it is 0.0208 pulses
per second.
Set the required totalizer cut off value – the lowest input value (in
engineering units) at which the totalizer is to stop counting.
3
, the calculation is as follows:
= 0.04167 pulses/second
3
m /sec
Area = total
volume of flow
1 hr
7 Configuration
Units
1 hr
Totalizer value
OI/RVG200-EN