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Displayed value can be
freely adjusted to the input
value inside the display
range.
8.2 Level measurement
A level sensor with linear characteristic
(non-linear sen sors ha ve to be li nea ri sed)
supplies 19 mA at full tank and 5 mA at empty
tank. If the tank is filled up, 10 m
3
should be
displayed and if the tank is empty 0 m
3
should
be displayed. 4…20 mA is chosen as input
range.
Assign 0 as „displayed value at min. input sig-
nal“ to the lo west input level (5 mA) and 10 as
„displayed value at max. input signal“ (19 mA).
The device is now tu ned to the sensor, inter-
mediate measurement values and their corre-
sponding display values can be calculated.
8.3 Drawn quantity
Instead of the level, the drawn quantity should
be displayed.
Again 4…20 mA is chosen as input range.
Assign 10 as „displayed value at min. input
signal“ to the lo west input level (5 mA) and 0
as „displayed value at max. input signal“
(19 mA).
8.4 Level measurement with limited
display range
A third example is level measurement with
limited display range, that means a tank with
10 m
3
have to be filled up at best to 8 m
3
and
its level should not decrease below 1 m
3
. At
values > 8 m
3
the dis play is to show „hi“ and
at values < 1 m
3
the display is to show „lo“.
4…20 mA is chosen as input range.
Assign 0 as „displayed value at min. input
signal“ to the lo west input level and 10 as
„displayed va lue at max. input signal“to the
highest input level.
Additionally, program for menu item „min. input
signal“, the value of which cor re sponds to the
1 m
3
level, e.g. 5.6 mA. Do the same for menu
item „max. input signal“ with the va lue which
cor re sponds to the 8 m
3
level, e.g. 16.8 mA.
At input levels > 16.8 mA „hi“ will be displayed
and at input levels < 5.6 mA „lo“.
Min. input
voltage or min.
input current
can be shifted
inside the input
voltage range or
the input current
range
Max. input
voltage or
max. input
current can
be shifted
inside the
input voltage
range or the
input current
range
Displayed value can be freely
adjusted to the input value
inside the display range.
Summary of Contents for CODIX 529
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