SIEMENS Transmitters for gauge, abs. and diff. pressure, flow and level

Transmitter for pressure, absolute pressure, differential pressure, flow and level form 1 mbar to 700 bar

Different requirements need different transmitters.

With different connection options and different housings – with or without a display.

Whether operation is conventional, smart or through WirelessHART, PROFIBUS PA or FOUNDATION Fieldbus – SITRANS P offers extensive user-friendliness and outstanding performance.

Measurement transducer for basic requirements


SITRANS P200

      • Single-range transmitters for relative and absolute pressure
      • Ceramic measuring cell
      • For general applications

SITRANS P210

      • Single-range transmitters for gauge pressure
      • Stainless steel measuring cell
      • For low-pressure applications

SITRANS P220

      • Single-range transmitters for gauge pressure
      • Stainless steel measuring cell, fully-welded version
      • For high-pressure applications and refrigeration technology

SITRANS LH100 (submersible sensor)

      • Transmitters for hydrostatic level measurements

SITRANS P Compact

    • Single-range transmitters
    • Standard ranges
    • Hygienic design
    • Range of different aseptic connections available
Transmitter with WirelessHART communicationSIEMENS Transmitters

SITRANS P280

    • Wireless communication with WirelessHART
    • Battery operation
    • Parameterization using 3 buttons and SIMATIC PDM with HART modem or wireless with Wireless-HART
Transmitters for food, pharmaceuticals and biotechnology

SITRANS P300

    • Smart and conventional operation, as well as operation via PROFIBUS or FOUNDATION Fieldbus
    • Hygienic design
    • Range of different aseptic connections available
    • With ATEX, FM and CSA approval
Transmitter for gauge pressure for the paper industry

SITRANS P300 and SITRANS P DS III

    • Smart and conventional operation, as well as operation via PROFIBUS or FOUNDATION Fieldbus
    • With PMC connection for the paper industry
    • With ATEX, FM and CSA approval
Transmitters for applications with basic requirements (Basic)

SITRANS P310

    • Pressure transmitters for gauge pressure, differential pressure and flow
    • Measuring accuracy up to 0.075 %
    • Range adjustment 100: 1
    • Parameterization using 3 buttons and HART
Transmitters for applications with advanced requirements (Advanced)

SITRANS P DS III

      • Pressure transmitters for gauge pressure, absolute pressure, differential pressure, flow and level
      • Measuring accuracy up to 0.065 %
      • Range adjustment 100: 1
      • Parameterization using:
        – 3 buttons and HART for SITRANS P DS III HART
        – 3 buttons and PROFIBUS PA for SITRANS P DS III PA
        – 3 buttons and FOUNDATION Fieldbus for SITRANS P DS III FF
      • Preferably for horizontal differential pressure lines
      • Intrinsically safe in zone 1 or flameproof enclosure
      • With ATEX, FM and CSA approval
      • Available ex stock

SITRANS P410

    • Pressure transmitters for gauge pressure, differential pressure, flow and level
    • Measuring accuracy up to 0.04 %
    • Range adjustment 100: 1
    • Parameterization using:
      – 3 buttons and HART for SITRANS P DS III HART
      – 3 buttons and PROFIBUS PA for SITRANS P DS III PA
      – 3 buttons and FOUNDATION Fieldbus for SITRANS P DS III FF
Transmitters for applications with the highest requirements (Premium)

SITRANS P500

    • Pressure transmitter for differential pressure, flow and level
    • Measuring accuracy up to 0.03 %
    • Range adjustment 200: 1
    • Very fast step response
    • High long-term stability
    • Parameterization using 3 buttons and HART
    • Extremely low long-term drift
    • Intrinsically safe in zone 1 or flameproof enclosure
    • With ATEX, FM and CSA approval

Integration

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 = ρFL · g · HU – ρoil · g · H1

Full-scale:

pME = ρFL · g · HO – ρoil · g · H1

Installation type B

Start-of-scale:

pMA = ρFL · g · HU + ρoil · g · H1

Full-scale:

pME = ρFL · g · HO + ρoil · g · H1

Legend

pMA

Pressure to be set at start-of-scale

pME

Pressure to be set at end-of-scale

ρFL

Density of medium in vessel

ρoil

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 + ρoil · g · H1

Full-scale:

pME = pEND + ρoil · 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

ρoil

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 – ρoil · g · HV

Full-scale:

pME = pEND – ρoil · 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

ρoil

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 – ρoil · g · HV

Full-scale:

pME = pFL · g · HO – ρoil · 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

ρoil

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 – ρoil · g · HV

Full-scale:

pME = pFL · g · HO – ρoil · 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

ρoil

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 = ρ · g · HU

Full-scale:

pME = ρ · g · HO

Legend

pMA

Pressure to be set at start-of-scale

pME

Pressure to be set at end-of-scale

ρ

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 · ρ1 + (HO – HU) · ρ2)

Full-scale:

pME = ρ1 · g · HO

Legend

pMA

Pressure to be set at start-of-scale

pME

Pressure to be set at end-of-scale

ρ1

Density of the heavier liquid

ρ2

Density of the lighter liquid

g

Local acceleration due to gravity

HU

Minimum level

HO

Maximum level

Density measurement

 

Start-of-scale:

pMA = ρMIN · g · HO

Full-scale:

pME = ρMAX · g · HO

Legend

pMA

Pressure to be set at start-of-scale

pME

Pressure to be set at end-of-scale

ρMIN

Minimum density of medium in vessel

ρMAX

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 = ρ · g · HU

Full-scale:

ΔpME = ρ · g · HO

Legend

ΔpMA

Pressure to be set at start-of-scale

ΔpME

Pressure to be set at end-of-scale

ρ

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 · ρ – HV · ρ′)

Full-scale:

pME = g · (HO · ρ – HV · ρ′)

Legend

pMA

Pressure to be set at start-of-scale

pME

Pressure to be set at end-of-scale

ρ

Density of medium in vessel

ρ′

Density of liquid in the negative pressure line, corresponding to the temperature existing there

g

Local acceleration due to gravity

HU

Minimum level

HO

Maximum level

HV

Distance between spigots

Separation layer measurement

 

Start-of-scale:

ΔpMA = g · (HU · ρ1 + (HO-HU) · ρ2 – HV · ρ′2)

Full-scale:

ΔpMA = g · (HO · ρ1 – HV · ρ′2)

Legend

pMA

Pressure to be set at start-of-scale

pME

Pressure to be set at end-of-scale

ρ1

Density of heavier liquid with separation layer in vessel

ρ2

Density of lighter liquid with separation layer in vessel

ρ′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