SMAR ld301, Operation And Maintenance Instruction Manual

Page: 29 / 70

Programming Using Hand-held Terminal
3.9
pt
LEVEL
(PRESSURE)
X VOLUME Y
1 - -10% - -0.62%
2 250mmH
2
O 0% 0m
3
0%
3 450mmH
2
O 10% 0.98m
3
5.22%
4 750mmH
2
O 25% 2.90m
3
15.38%
5 957.2mmH
2
O 35.36% 4.71m
3
25%
6 1050mmH
2
O 40% 7.04m
3
37.36%
7 1150mmH
2
O 45% 8.23m
3
43.65%
8 1250mmH
2
O 50% 9.42m
3
50%
    
15 2250mmH
2
O 100% 18.85m
3
100%
16 - 110% - 106%
Table 3.3 - Tank Strapping Table
As shown on the previous example, the points may be freely distributed for any desired
value of X. In order to achieve a better linearization, the distribution should be
concentrated in the less linear parts of the measurement.
The LD301 includes an internal feature to enable and disable the Linearization Table.
TOTALIZATION CONFIGURATION
When the LD301 works in flow applications it is often desirable to totalize the flow in
,
order to know the accumulated volume or mass that has flown through the
pipe/channel.
The totalizer integrates PV% over time:
The totalizer integrates the PV% along time, working with a time scheduling based on
seconds, as per the following formula:
dt PV
INCREMENT ON TOTALIZATI
FLOWRATE MAXIMUM
TOT %
∫
=
The totalization method uses such totalized value and, through three parameters
(MAXIMUM FLOWRATE, TOTALIZATION INCREMENT and TOTALIZATION UNIT),
converts it to the user defined totalization unit:
MAXIMUM FLOWRATE - this is the maximum flow rate expressed in units of
volume or mass per second, corresponding to the measurement (PV%=100%). For
example: m
3
/s, bbl/s, kg/s, lb/s.
TOTALIZATION INCREMENT - this is used to convert the flow rate base unit into
a multiple unit of mass or volume. For example, a flow rate totalized in gallons/s
may be converted to a volume in m
3
; a mass flow rate of g/s may be converted to
kilos, etc.
TOTALIZATION UNIT - this is the engineering unit. It shall be associated to the
totalized value. It may be a standard unit or a special unit with up to five characters.
ATTENTION :
The totalizer shall be disabled so that any of these parameters can be configured.
The largest totalized value is 99.999.999 totalizing units. When the totalization is
displayed, the most significant part is shown on the numeric field, and the less
significant part is shown on the alphanumeric field. Figure 3.3 shows a typical display
indication.