Yokogawa 414 Batch Controller - Manual (Page 20)

3.3 CALCULATION OF RATE AND TOTAL
3.3.1 Analog Input
The flowrate, R, is calculated as follows:
if the linear relationship is selected. R
=
SA
+
C
if a square law relationship is selected. R
=
S A
+
C
or if an open channel relationship is selected. R
=
SA n +
C
where A= the input value.
S = the span.
C= the zero.
n = a variable power which can be programmed between 0 and
9.999.
At the minimum input (ie. 4mA, 0mA, 1 Volt or 0 Volts), A = 0, and at the
maximum input (ie. 20mA, 5 Volts or 10 Volts), A = 1.
The Span, S, can be set during calibration anywhere in the range of 0.1000 to
50000.0000 and the Zero value, C, set in the range 0.0000 to 50000.0000.
The Span, S, can be selected to display rate in any units desired, such as
litres/minute or kilograms/hour. This also means that the Total will be displayed
with the same unit of volume, ie. litres or kilograms.
18 Operation