Advanced Videographic Recorder
SM2000
4 CONFIGURATION
92
IM/SM2000
Issue 11
Analog Input Sources only – see Section 4.6.1, page 77.
Set the required totalizer count rate and cut off value.
The count rate is determined by the maximum number of
engineering units (or pulses) per second and the smallest
totalizer increment:
Example
– to totalize a flow with a maximum rate of 2500 liters/
minute (= 2.5m
3
/minute) to the nearest 0.1m
3
, the calculation is
as follows:
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 'Predetermined count' value – see page
91.
The totalizer cut off value is the lowest input value (in engineering
units) at which the totalizer is to stop counting.
OR
Digital Input Sources only – see Section 4.6.1, page 77
Set the required totalizer count rate.
A digital totalizer pulse can be scaled to represent a value of
between 0.00001 and 1000.00000. The totalizer is then
incremented by this amount each time there is an off/on
transition.
Example
– a count of 5 digital pulses with 'Count rate' set to
100 increments the totalizer from 0 to 500 in 100 unit steps.
engineering full scale value (rate)
engineering units (in seconds)
--------------------------------------------------------------------------
150m
3
/hour
3600 seconds
---------------------------------
0.04167 pulses/second
=
The totalizer pulse rate is
proportional to the input signal.
At this point it is
0.0208 pulses per second
0
150
t
Area = total
volume of flow
m
3
/hr
m
3
/sec
0.04167
0.0208
75
1hr
Input Signal
0
2000
t
Units
1000
1hr
Totalizer Value
Off
t
1minute
Input Signal
0
500
t
Units
1minute
Totalizer Value
400
300
200
100
On
