FP4, FP4W
47
Fig. 11.5 Entering the formula in the Math Channel.
The
Operation
field enables the selection of one of the four available formulas using
the drop-down list and symbols: +, -,
ˣ,
.
Symbol
Formula
+
[(A
ˣKx) + (BˣKy)] + C
-
[(A
ˣKx) - (BˣKy)] + C
ˣ
[(A
ˣKx)
ˣ
(B
ˣKy)] + C
[(A
ˣKx)
(B
ˣKy)] + C
The coefficients
A
,
B
and
C
are constant values. The values of coefficients
A
and
B
is set as 1.0000 by default, the value of coefficient
C
is set as 0.0000 by default.
Values of coefficients
Kx
and
Ky
can be selected using the drop-down list as 0.0 or
as the value of the selected channel (
Channel 1
..
Channel 6
). To disable the channel,
set the
Disabled
option in the
Operation
field.
[3]: The characteristic is typically set to
Linear
. Also there are available other setting
options (for example
User characteristic
).
11.4.2 General
Unit: [None]
(text)
[1]
Time base: /s
[ /s, /m, /h]
[2]
Resolution: 0
(0, 0.0, 0.00, 0.000, 0.0000)
[3]
Filter: Disabled
(Disabled, 2s, 5s, 10s, 20s, 30s, 1min, 2min, 3min, 5min)
[4]
Archiving: Disabled
(Disabled, Enabled)
[5]
Failure value: Disabled
(Disabled, Constant [value])
[6]
[1]: The unit is provided for information purposes only. User can put in any text string
which does not affect the calculated or measured results displayed by the device.
[2]: The
Time base
is crucial only for flow measurements and totalizers calculation. In
spite of
Unit
set above, it determines calculations for totalizes and flows according to
/s
(per second),
/m
(per minute) or
/h
(per hour) setting.
[3]: The resolution defines the number of decimal places in the displayed result. It is
unreasonable to set too high resolution for the measurement, because accuracy will
not be improved (e.g. Pt100 sensor measurement set to three places after the
decimal point
will not provide for measurement accuracy of up to 0.001°C). However,
if a filter is activated with sufficiently high time constant and if the resolution is
reasonably increased, the changes can be identified more clearly.
[4]:
The filter function “smoothes out” sudden surges in the measured values or
eliminates signal noise. If the filter time constant is too high, the measurement value
