BEKA BA658C, Руководство пользователя, Страница: 20 / 33

20
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,
the Cal Value 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 Hundreds of Litres
318.2 Gallons
(There are 4.54609 litres in a UK gallon)
000001.
Set Scale Factor
5.5.4 Scaling ( For 4/20mA input )
The 4/20mA analogue output from a flowmeter
represents the rate of flow, which may be
displayed by the BA658C batch controller in
any engineering units. See section 5.6.3
Total batched volume is calculated by
integrating the flow rate during the batching
period.
The batch controller Scale Factor, which is a
dividing factor that may be adjusted between
0.001 and 999999, defines the arithmetic
relationship between the units of
measurement of the rate and the total batched
displays.
Scale Factor = Units of batched display
Units of rate display
When calculating this Scale Factor, the
required units of measurement for the total
batched display must be converted to those
used for the rate display as shown in the
following example.
The BA658C rate display represents litres per
second but the total batched display is
required in UK gallons.
Scale Factor = Units of batched display
Units of rate display
= 1 gallon = 4.5461 litre
1 litre 1 litres
Scale Factor = 4.5461
If the rate display and the total batched display
are required in the same units of
measurement, the Scale Factor should be set
to 1.0
000001.
Set Scale Factor
5.5.5 Batch D.P.
The position of the decimal point in the batch
display, which determines the resolution of the
display, is set by this function. In operation
leading zeros are suppressed
00000000.
Set Display D.P.
The function also determines the position of
the decimal point in the Batch Size, Batch
Limit and Pre-Stop functions.
5.5.6 Batch Legend
The units of measurement of the batched
volume can be entered with this function. Up
to six upper and lower case alphanumeric
characters may be used. Some of the
operator screens will display this legend
against the batch display.
XXXXXX
Set Batch Legend