ENG: Transmitter for rel. pressure, abs. pressure, diff. pressure, flow and level
Measuring setups with remote seals
The following pages show examples of typical measuring setups for using SITRANS P pressure transmitters with and without remote seals.
Installation
Remote seals of sandwich design are fitted between the connection flange of the measuring point and a dummy flange.
Remote seals of flange design are fitted directly on the connection flange of the measuring point.
The respective pressure rating of the dummy flange or the flanged remote seal must be observed.
The pressure transmitter should always be installed below the connection flange (and always below the lower connection flange in the case of differential pressure transmitters). When measuring at pressures above atmospheric, the pressure transmitter can also be installed above the connection flange. When measuring at pressures below atmospheric, the transmitter must always be installed below the connection flange (and always below the lower connection flange in the case of differential pressure transmitters).
Offset of measuring range
If there is a difference in height between the two connection flanges when measuring with two remote seals, an additional differential pressure will result from the oil filling of the remote seal capillaries. This results in a measuring range offset which has to be taken into account when you set the pressure transmitter.
An offset of the measuring range also arises when pressure transmitters and remote seals are not installed at the same height
Pressure transmitter output
If the level, separation layer or density increase in closed vessels, the differential pressure and hence the output signal of the pressure transmitter also increase.
If the output signal is to fall as the differential pressure rises, you must swap the start of scale with the end of scale.
With open vessels, a rising pressure is usually assigned to an increasing level, separation layer or density.
Influence of ambient temperature
The capillaries between the remote seal and the pressure transmitter should be kept as short as possible to obtain a good transmission response. Steps should also be taken to avoid temperature differences between the individual remote seals.
If the complete setup is exposed to temperature variations, temperature errors will result from the thermally induced change of volume of the filling liquid in the capillaries, in the remote seals and in the connection parts.
Notes
When measuring separation layers, ensure that:
The separation layer is positioned between the two spigots.
The level in the vessel is always above the top spigot.
Possible combinations of pressure transmitters and remote seals
Type of installation
Pressure transmitters
Remote seals
A / B
7MF4010
7MF4013
7MF4033
7MF4034
7MF4035
7MF8023
7MF8024
7MF4900
7MF4910
7MF4920
C1 / C2
7MF4233
7MF4234
7MF4235
7MF4900
7MF4910
7MF4920
(vacuum-proof design in each case)
7MF4333
7MF4334
7MF4335
7MF4901
7MF4921
D
7MF4433
7MF4434
7MF4435
7MF4903
7MF4923
E
7MF4433
7MF4434
7MF4435
7MF4913
G / H / J
7MF4433
7MF4434
7MF4435
7MF4903
7MF4923
Types of installation for pressure and level measurements (open vessels)
Installation type A
Start-of-scale:
pMA = ÏFL · g · HU - Ïoil · g · H1
Full-scale:
pME = ÏFL · g · HO - Ïoil · g · H1
Installation type B
Start-of-scale:
pMA = ÏFL · g · HU + Ïoil · g · H1
Full-scale:
pME = ÏFL · g · HO + Ïoil · g · H1
Legend
pMA
Pressure to be set at start-of-scale
pME
Pressure to be set at end-of-scale
ÏFL
Density of medium in vessel
Ïoil
Density of filling oil in the capillary to the remote seal
g
Local acceleration due to gravity
HU
Minimum level
HO
Maximum level
H1
Distance between vessel flange and pressure transmitter
Types of installation for absolute level measurements (closed vessels)
Installation type C1 and C2
Start-of-scale:
pMA = pSTART + Ïoil · g · H1
Full-scale:
pME = pEND + Ïoil · g · H1
Legend
pMA
Pressure to be set at start-of-scale
pME
Pressure to be set at end-of-scale
pSTART
Pressure at start-of-scale
pEND
Pressure at end-of-scale
Ïoil
Density of filling oil in the capillary to the remote seal
g
Local acceleration due to gravity
H1
Distance between vessel flange and pressure transmitter
Types of installation for differential pressure and flow measurements
Installation type D
Start-of-scale:
pMA = pSTART - Ïoil · g · HV
Full-scale:
pME = pEND - Ïoil · g · HV
Legend
pMA
Pressure to be set at start-of-scale
pME
Pressure to be set at end-of-scale
pSTART
Pressure at start-of-scale
pEND
Pressure at end-of-scale
Ïoil
Density of filling oil in the capillary to the remote seal
g
Local acceleration due to gravity
HV
Distance between spigots
Types of installation for level measurements
Installation type E
Start-of-scale:
pMA = pFL · g · HU - Ïoil · g · HV
Full-scale:
pME = pFL · g · HO - Ïoil · g · HV
Legend
pMA
Pressure to be set at start-of-scale
pME
Pressure to be set at end-of-scale
pFL
Density of medium in vessel
Ïoil
Density of filling oil in the capillary to the remote seal
g
Local acceleration due to gravity
HU
Minimum level
HO
Maximum level
HV
Distance between spigots
Installation types G, H and J
Start-of-scale:
pMA = pFL · g · HU - Ïoil · g · HV
Full-scale:
pME = pFL · g · HO - Ïoil · g · HV
Legend
pMA
Pressure to be set at start-of-scale
pME
Pressure to be set at end-of-scale
pFL
Density of medium in vessel
Ïoil
Density of filling oil in the capillary to the remote seal
g
Local acceleration due to gravity
HU
Minimum level
HO
Maximum level
HV
Distance between spigots
Measuring setups without remote seals
The following types of installation are used to measure level, separation level and density in open and closed vessels without the application of remote seals.
Notes
When measuring separation layers, ensure that:
The separation layer is positioned between the two spigots.
The level in the vessel must always be above the top spigot.
When measuring density, ensure that:
At the end of this section is a questionnaire which you can use is used for hydrostatic level measurements, e.g. for measuring the level in steam boilers, steam drums, condensation vessels, etc.
Setup for pressure transmitters for differential pressure, flange mounting (open vessels)
Level measurement
Start-of-scale:
pMA = Ï · g · HU
Full-scale:
pME = Ï · g · HO
Legend
pMA
Pressure to be set at start-of-scale
pME
Pressure to be set at end-of-scale
Ï
Density of medium in vessel
g
Local acceleration due to gravity
HU
Minimum level
HO
Maximum level
Separation layer measurement
Start-of-scale:
pMA = g · (HU · Ï1 + (HO - HU) · Ï2)
Full-scale:
pME = Ï1 · g · HO
Legend
pMA
Pressure to be set at start-of-scale
pME
Pressure to be set at end-of-scale
Ï1
Density of the heavier liquid
Ï2
Density of the lighter liquid
g
Local acceleration due to gravity
HU
Minimum level
HO
Maximum level
Density measurement
Start-of-scale:
pMA = ÏMIN · g · HO
Full-scale:
pME = ÏMAX · g · HO
Legend
pMA
Pressure to be set at start-of-scale
pME
Pressure to be set at end-of-scale
ÏMIN
Minimum density of medium in vessel
ÏMAX
Maximum density of medium in vessel
g
Local acceleration due to gravity
HO
Maximum level
Setup for pressure transmitters for differential pressure, flange mounting (closed vessels)
Level measurement, version 1
Start-of-scale:
ΔpMA = Ï · g · HU
Full-scale:
ΔpME = Ï · g · HO
Legend
ΔpMA
Pressure to be set at start-of-scale
ΔpME
Pressure to be set at end-of-scale
Ï
Density of medium in vessel
g
Local acceleration due to gravity
HU
Minimum level
HO
Maximum level
Level measurement, version 2
Start-of-scale:
pMA = g · (HU · Ï - HV · Ï′)
Full-scale:
pME = g · (HO · Ï - HV · Ï′)
Legend
pMA
Pressure to be set at start-of-scale
pME
Pressure to be set at end-of-scale
Ï
Density of medium in vessel
Ï′
Density of liquid in the negative pressure line, corresponding to the temperature existing there
Density of heavier liquid with separation layer in vessel
Ï2
Density of lighter liquid with separation layer in vessel
Ï′2
Density of liquid in the negative pressure line for separation layer measurement, corresponding to the temperature existing there
g
Local acceleration due to gravity
HU
Minimum level
HO
Maximum level
HV
Distance between spigots
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