BEKA BA654D, Manual

Page: 19 / 34

19
5.5 BATCH SETTINGS
See Fig 9.
5.5.1 Scale Points (Non-linear pulse inputs)
This and the following Scale Factors function
described in section 5.5.2 are used to calibrate
the 16 point lineariser. The lineariser is
activated from the System Menu - see section
5.4.6.
Fig 10 shows the relationship between input
frequency and Scale Factor for a lineariser
using three breakpoints. Up to sixteen
breakpoints may be used, the input frequency
for any breakpoints that are not required
should be set to zero.
Fig 10 Three point lineariser
The Scale Factor at input frequencies below
the lowest Scaling Point is the same as that
entered for the lowest Scaling Point.
The Scale Factor for input frequencies above
the highest Scaling Point is the same as that
entered for the highest Scaling point.
The Scale Factor at input frequencies between
two Scaling Points is calculated according to a
straight line between the Scale Factors at the
two points.
The input frequency at which each breakpoint
is require should be set using this function.
Point 01: XXXX.X
to
Point 16: XXXX.X
Select Scaling Point / Set Frequency
5.5.2 Scale Factors (Non-linear pulse
inputs)
The k factor of a flowmeter is the number of
output pulses that it produces per unit volume
e.g. 70 pulses per litre.
The batch controller’s Scale Factor is a
dividing factor adjustable between 0.001 and
999999, which is used to convert the output
pulses from the flowmeter into a volume
display in engineering units.
Volume displayed = Number of input pulses
Scale Factor
If the Scale Factor is set to the flowmeter’s k
factor, the batch controller will display volume
in the flowmeter’s engineering units.
e.g. For a flowmeter having a k factor of 70
pulses per litre, the batch controller Scale
Factor may be selected to provide the required
display
Scale Factor Least significant
Display digit represents
Litres
0.7 Hundredths of a Litre
7.0 Tenths of a Litre
70.0 Litres
700.0 Tens of Litres
7000.0 Hundreds of Litres
318.2 Gallons
(There are 4.54609 litres in a UK gallon)
This function sets the required Scale Factor at
each Scaling Point input frequency
(breakpoint) defined in the Scaling Point
function described in section 5.5.1
XXXX.X: XXXXXX
to
XXXX.X: XXXXXX
Select Frequency / Set Scale Factor
5.5.3 Scale Factor ( For linear pulse inputs )
The k factor of a flowmeter is the number of
output pulses that it produces per unit volume
e.g. 70 pulses per litre.
The batch controller’s Scale Factor is a
dividing factor adjustable between 0.001 and
999999, which is used to convert the output
pulses from the flowmeter into a volume
display in engineering units.