Vega VEGADIF 65, Руководство по эксплуатации

Страница: 29 / 104

T
he min
.
adjustment is carried out for the di ff erential pressure
measured at density
1
.
0
:
Δ p =
ρ
• g • h
=
1
.
0
kg / dm
³
•
9
.
81
m / s •
0
.
3
m
=
29
.
4
mbar
T he max . adjustment is carried out for the di ff erential pressure
measured at density
1
.
2
:
Δ
p =
ρ
•
g
•
h
=
1
.
2
kg / dm
³
•
9
.
81
m / s •
0
.
3
m
=
35
.
3
mbar
=
∆p
h g
+
–
0,3 m
F ig .
23
: M easurement setup with density measurement
I n a vessel with varying level , an interface measurement with a
di ff erential pressure transmitter can be realized . T he connection on the
vessel is carried out via a chemical seal on two measuring points . A n
interface measurement is only possible if the densities of the two
products remain the same and the interface is always between the two
measuring points
. T he total level must always be above the upper
measuring point .
T
his density measurement functions with open but also with closed
vessel
.
E xample for an interface measurement :
D istance between the two measurement points :
0
.
3
m
M in . density :
0
.
8
kg / dm
3
M ax . density :
1
.
0
kg / dm
3
T
he min
.
adjustment is carried out for the di ff erential pressure occuring
with density
0
.
8
:
Δ p =
ρ
• g • h
=
0
.
8
kg / dm
³
•
9
.
81
m / s •
0
.
3
m
I nterface measurement
VEGADIF
65
• F oundation F ieldbus
29
4
M ounting
36130
-
EN
-
110510