© Siemens AG 2008

SITRANS P measuring instruments for pressure

Remote seals

Measuring setups with remote seals

Types of installation for level measurements (closed vessels)

Installation type E

2

DH

H V HO

H U

Installation type E

Start-of-scale: pMA = rFL · g · HU - rOil · g · HV

Full-scale:

pME = rFL · g · HO - rOil · g · HV

Legend

 

pMA

Start-of-scale value to be set

pME

Full-scale value to be set

rFL

Density of medium in vessel

rOil

Density of filling oil in the capillary to

 

the remote seal

gLocal acceleration due to gravity

HU

Start-of-scale value

HO

Full-scale value

HV

Distance between the measuring points (spigots)

Installation type G

Installation type H

Installation type J

DH

HV H O

H U

H 2

H 1

H 1

H 2

H 1

H2

Pressure transmitter for differential pressure above the upper measuring point, no vacuum

H1 £ 7 m (23 ft), with halocarbon oil as filling liquid only H1 £ 4 m (13.1 ft)

below the lower measuring point

between the measuring points, no vacuum

H2 £ 7 m (23 ft), with halocarbon oil as filling liquid only H2 £ 4 m (13.1 ft)

Installation type G, H and J

 

 

 

 

 

Legend

Start-of-scale:

p

MA

= r

FL

· g · H

U

- r

Oil

· g · H

V

pMA

 

 

 

 

 

 

pME

Full-scale:

pME = rFL · g · HO - rOil · g · HV

rFL

 

 

 

 

 

 

 

 

 

 

 

rOil

Start-of-scale value to be set Full-scale value to be set Density of medium in vessel

Density of filling oil in the capillary to the remote seal

gLocal acceleration due to gravity

HU

Start-of-scale value

HO

Full-scale value

HV

Distance between the measuring points (spigots)

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Siemens FI 01 · 2009

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Image 184
Siemens P technical specifications 184, Types of installation for level measurements closed vessels