Pulscon LTC
Function group "linearisation" (04)
D
O
C
T
-0
0
9
4
A
0
6
/2
009
12
07
82
33
horizontal cyl
The vol
u
me, mass etc. are calc
u
lated a
u
tomatically in cylindrical horizontal tanks
b
y
entering the
"diameter vessel"
(047)
, the
"customer unit"
(042)
and the
"max. scale" (046)
. The
"max. scale" (046)
corresponds to an o
u
tp
u
t of
100 % (= 20 mA for HART).
manual
If the level is not proportional to the vol
u
me or weight within the set meas
u
ring range,
yo
u
can enter a linearisation ta
b
le in order to meas
u
re in c
u
stomer
u
nits. The
req
u
irements are as follows:
•
The 32 (max.) val
u
e pairs for the linearisation c
u
rve points are known.
•
The level val
u
es m
u
st
b
e given in ascending order. The c
u
rve is monotono
u
sly
increasing.
•
The level heights for the first and last points on the linearisation c
u
rve correspond
to empty and f
u
ll cali
b
ration respectively.
•
The linearisation takes place in the
b
asic set
u
p
u
nit (
"distance unit"
(0C5)
).
Each point (2) in the ta
b
le is descri
b
ed
b
y a val
u
e pair: level (3) and, for example,
vol
u
me (4). The last val
u
e pair defines the 100 % o
u
tp
u
t (= 20 mA for HART).
0 %
4 mA
100 %
20 mA
kg, m
3
, ft
3
, ... = Customer unit (042)
Max. scale
(046)
Diameter vessel (047)
100 %
0 %
4 mA
(2)
(4)
(3)
20 mA
kg, m
3
, ft
3
, ... = Customer unit (042)