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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)
C1 / C2	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:	p_MA = ГЏЃ_FL · g · H_U - ГЏЃ_oil · g · H₁
	Full-scale:	p_ME = ГЏЃ_FL · g · H_O - ГЏЃ_oil · g · H₁
	Installation type B
	Start-of-scale:	p_MA = ГЏЃ_FL · g · H_U + ГЏЃ_oil · g · H₁
	Full-scale:	p_ME = ГЏЃ_FL · g · H_O + ГЏЃ_oil · g · H₁
	Legend
	p_MA	Pressure to be set at start-of-scale
	p_ME	Pressure to be set at end-of-scale
	ГЏЃ_FL	Density of medium in vessel
	ГЏЃ_oil	Density of filling oil in the capillary to the remote seal
	g	Local acceleration due to gravity
	H_U	Minimum level
	H_O	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:	p_MA = p_START + ГЏЃ_oil · g · H₁
	Full-scale:	p_ME = p_END + ГЏЃ_oil · g · H₁
	Legend
	p_MA	Pressure to be set at start-of-scale
	p_ME	Pressure to be set at end-of-scale
	p_START	Pressure at start-of-scale
	p_END	Pressure at end-of-scale
	ГЏЃ_oil	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:	p_MA = p_START - ГЏЃ_oil · g · H_V
	Full-scale:	p_ME = p_END - ГЏЃ_oil · g · H_V
	Legend
	p_MA	Pressure to be set at start-of-scale
	p_ME	Pressure to be set at end-of-scale
	p_START	Pressure at start-of-scale
	p_END	Pressure at end-of-scale
	ГЏЃ_oil	Density of filling oil in the capillary to the remote seal
	g	Local acceleration due to gravity
	H_V	Distance between spigots

Types of installation for level measurements

	Installation type E
	Start-of-scale:	p_MA = p_FL · g · H_U - ГЏЃ_oil · g · H_V
	Full-scale:	p_ME = p_FL · g · H_O - ГЏЃ_oil · g · H_V
	Legend
	p_MA	Pressure to be set at start-of-scale
	p_ME	Pressure to be set at end-of-scale
	p_FL	Density of medium in vessel
	ГЏЃ_oil	Density of filling oil in the capillary to the remote seal
	g	Local acceleration due to gravity
	H_U	Minimum level
	H_O	Maximum level
	H_V	Distance between spigots

	Installation types G, H and J
	Start-of-scale:	p_MA = p_FL · g · H_U - ГЏЃ_oil · g · H_V
	Full-scale:	p_ME = p_FL · g · H_O - ГЏЃ_oil · g · H_V
	Legend
	p_MA	Pressure to be set at start-of-scale
	p_ME	Pressure to be set at end-of-scale
	p_FL	Density of medium in vessel
	ГЏЃ_oil	Density of filling oil in the capillary to the remote seal
	g	Local acceleration due to gravity
	H_U	Minimum level
	H_O	Maximum level
	H_V	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:	p_MA = ГЏЃ · g · H_U
	Full-scale:	p_ME = ГЏЃ · g · H_O
	Legend
	p_MA	Pressure to be set at start-of-scale
	p_ME	Pressure to be set at end-of-scale
	ГЏЃ	Density of medium in vessel
	g	Local acceleration due to gravity
	H_U	Minimum level
	H_O	Maximum level

Separation layer measurement
	Start-of-scale:	p_MA = g · (H_U · ГЏЃ₁ + (H_O - H_U) · ГЏЃ₂)
	Full-scale:	p_ME = ГЏЃ₁ · g · H_O
	Legend
	p_MA	Pressure to be set at start-of-scale
	p_ME	Pressure to be set at end-of-scale
	ГЏЃ₁	Density of the heavier liquid
	ГЏЃ₂	Density of the lighter liquid
	g	Local acceleration due to gravity
	H_U	Minimum level
	H_O	Maximum level

Density measurement
	Start-of-scale:	p_MA = ГЏЃ_MIN · g · H_O
	Full-scale:	p_ME = ГЏЃ_MAX · g · H_O
	Legend
	p_MA	Pressure to be set at start-of-scale
	p_ME	Pressure to be set at end-of-scale
	ГЏЃ_MIN	Minimum density of medium in vessel
	ГЏЃ_MAX	Maximum density of medium in vessel
	g	Local acceleration due to gravity
	H_O	Maximum level

Setup for pressure transmitters for differential pressure, flange mounting (closed vessels)

Level measurement, version 1
	Start-of-scale:	О”p_MA = ГЏЃ · g · H_U
	Full-scale:	О”p_ME = ГЏЃ · g · H_O
	Legend
	О”p_MA	Pressure to be set at start-of-scale
	О”p_ME	Pressure to be set at end-of-scale
	ГЏЃ	Density of medium in vessel
	g	Local acceleration due to gravity
	H_U	Minimum level
	H_O	Maximum level

Level measurement, version 2
	Start-of-scale:	p_MA = g · (H_U · ГЏЃ - H_V · ГЏЃГўв‚¬І)
	Full-scale:	p_ME = g · (H_O · ГЏЃ - H_V · ГЏЃГўв‚¬І)
	Legend
	p_MA	Pressure to be set at start-of-scale
	p_ME	Pressure to be set at end-of-scale
	ГЏЃ	Density of medium in vessel
	ГЏЃГўв‚¬І	Density of liquid in the negative pressure line, corresponding to the temperature existing there
	g	Local acceleration due to gravity
	H_U	Minimum level
	H_O	Maximum level
	H_V	Distance between spigots

Separation layer measurement
	Start-of-scale:	О”p_MA = g · (H_U · ГЏЃ₁ + (H_O-H_U) · ГЏЃ₂ - H_V · ГЏЃГўв‚¬І₂)
	Full-scale:	О”p_MA = g · (H_O · ГЏЃ₁ - H_V · ГЏЃГўв‚¬І₂)
	Legend
	p_MA	Pressure to be set at start-of-scale
	p_ME	Pressure to be set at end-of-scale
	ГЏЃ1	Density of heavier liquid with separation layer in vessel
	ГЏЃ₂	Density of lighter liquid with separation layer in vessel
	ГЏЃГўв‚¬І₂	Density of liquid in the negative pressure line for separation layer measurement, corresponding to the temperature existing there
	g	Local acceleration due to gravity
	H_U	Minimum level
	H_O	Maximum level
	H_V	Distance between spigots

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