Siemens SITRANS P - Manual (Page 183)

SITRANS P measuring instruments for pressure
Remote seals
Measuring setups with remote seals
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Dimensional drawings
Types of installation for pressure and level measurements (open vessels)
Types of installation for absolute level measurements (closed vessels)
Type of installation for differential pressure and flow measurements
H
1
H
1
H
U
DH
H
O
H
U
DH
H
O
Installation type A
Start-of-scale: p
MA
= r
FL
· g · H
U
- r
Oil
· g · H
1
Full-scale: p
ME
= r
FL
· g · H
O
- r
Oil
· g · H
1
Installation type B
Start-of-scale: p
MA
= r
FL
· g · H
U
+ r
Oil
· g · H
1
Full-scale: p
ME
= r
FL
· g · H
O
+ r
Oil
· g · H
1
Legend
p
MA
Start-of-scale value to be set
p
ME
Full-scale value to be set
r
FL
Density of medium in vessel
r
Oil
Density of filling oil in the capillary to
the remote seal
g Local acceleration due to gravity
H
U
Start-of-scale value
H
O
Full-scale value
H
1
Distance between vessel flange and pressure trans.
Pressure transmitter
above the measuring point
Pressure transmitter
below the measuring point
H
1
£ 7 m (23 ft), with halocarbon oil as filling liquid only H
1
£ 4 m (13.1 ft)
Installation type A Installation type B
Installation type C
1
and C
2
Start-of-scale: p
MA
= p
START
+ r
Oil
· g · H
1
Full-scale: p
ME
= p
END
+ r
Oil
· g · H
1
Legend
p
MA
Start-of-scale value to be set
p
ME
Full-scale value to be set
p
START
Start-of-scale value
p
END
Full-scale value
r
Oil
Density of filling oil in the capillary to
the remote seal
g Local acceleration due to gravity
H
1
Distance between vessel flange and pressure trans. H
1
H
1
p
abs
p
abs
Pressure transmitter for absolute pressure always below the measuring point: H
1
³ 200 mm (7.9 inch)
Installation type C
1
Installation type C
2
H
2
H
V
H
1
Installation type D
Start-of-scale: p
MA
= p
START
- r
Oil
· g · H
V
Full-scale: p
ME
= p
END
- r
Oil
· g · H
V
Legend
p
MA
Start-of-scale value to be set
p
ME
Full-scale value to be set
p
START
Start-of-scale value
p
END
Full-scale value
r
Oil
Density of filling oil in the capillary to
the remote seal
g Local acceleration due to gravity
H
V
Distance between the measuring points (spigots)
Installation type D Filter monitoring
© Siemens AG 2008