User manual - METER SRP-457
Figure. 9.4 Example of user defined characteristic
9.1.5.
Volume characteristics of a cylindrical tank
Volume characteristics of a cylindrical
tank is defined by parameters of tank (see menu
”inPt”
). Normalized input is proportional to level 'h' and linear scaling by parameters: "
t Sn"
,
"t
Sh"
(for normalized input value equal 0, displays value
"t Sn"
and for normalized input value
equal 1, displays value
"t Sh"
+
"t Sn"
(Figure 9.5).
The linear scaling can be expressed as follow:
h=I
n
·"t Sh"+"t Sn"
where 'h' is level of liquids, gases or solids in the tank, see Figure 7.1, 7.2.
Figure 9.5 The characteristic of level of liquids, gases or solids in tank depending on input
current in 4÷20mA range.
Volume of tank can be write by general formula:
38
D
is
pl
ay
ed
v
al
ue
Prąd wejściowy [mA]
0
4
8
12
16
20
Y (PH)
0
0,2
0,35
0,5
0,7
1
0,9
Y (PL)
X = „20.0.”
X = „35.0.”
X (PL) = „50.0.”
X (PH) = „70.0.”
X = „90.0.”
X = „100.0.”
Input current [mA]
Normalized measurement I
n
(for 0-20 mA range)
5-elements characteristic
L
e
v
e
l
'h
'
Input current [mA]
0
4
8
12
16
20
”t Sh”+”t Sn”
”t Sn”
Summary of Contents for SRP-457
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