Обзор



SITRANS P pressure transmitters, DS III series, are digital pressure transmitters featuring extensive user-friendliness and high accuracy. The parameterization is performed using control keys, over HART communication, PROFIBUS-PA or Foundation Fieldbus interface.

Extensive functionality enables the pressure transmitter to be precisely adapted to the plant's requirements. Operation is very simple in spite of the numerous setting options.

Transmitters with type of protection "Intrinsic safety" and "Explosion-proof" may be installed within potentially explosive atmospheres (zone 1) or in zone 0. The transmitters are provided with an EC type examination certificate and comply with the corresponding harmonized European standards (ATEX).

The transmitters can be equipped with various designs of remote seals for special applications such as the measurement of highly viscous substances.

Various versions of the DS III pressure transmitters are available for measuring:

• Gage pressure
• Absolute pressure
• For differential pressure transmitters
• Filling level
• Mass
• Volume
• Volume flow
• Mass flow

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Область применения



The pressure transmitters of the DS III series, can be used in industrial areas with extreme chemical and mechanical loads. Electromagnetic compatibility in the range 10 kHz to 1 GHz makes the DS III pressure transmitters suitable for locations with high electromagnetic emissions.

Pressure transmitters with type of protection "Intrinsic safety" and "Explosion-proof" may be installed within potentially explosive atmospheres (zone 1) or in zone 0. The pressure transmitters are provided with an EC type examination certificate and comply with the corresponding harmonized European standards (ATEX).

Pressure transmitters with the type of protection "Intrinsic safety" for use in zone 0 may be operated with power supply units of category "ia" and "ib".

The transmitters can be equipped with various designs of remote seals for special applications such as the measurement of highly viscous substances.

The pressure transmitter can be operated locally over 3 control buttons or programmed externally over HART communication or over PROFIBUS PA or Foundation Fieldbus interface.

Pressure transmitter for gauge pressure

• Measured variable: Gauge pressure of aggressive and non-aggressive gases, vapors and liquids.
• Span (infinitely adjustable)
  for DS III HART: 0.01 bar to 700 bar (0.15 psi to 10153 psi)
• Nominal measuring range
  for DS III PA and FF: 1 bar to 700 bar (14.5 psi to 10153 psi)

Pressure transmitters for absolute pressure

• Measured variable: Absolute pressure of aggressive and non-aggressive gases, vapors and liquids.
• Span (infinitely adjustable)
  for DS III HART: 8.3 mbar a ... 100 bar a (0.12 ... 1450 psi)
• Nominal measuring range
  for DS III PA and FF: 250 mbar a ... 100 bar a (3.6 ... 1450 psi)
• There are two series:
  • Gauge pressure series
  • Differential pressure series

Pressure transmitters for differential pressure and flow

• Measured variables:
  • Differential pressure
  • Small positive or negative pressure
  • Flow q ~ √Δp (together with a primary differential pressure device (see Chapter "Flowmeters"))
• Span (infinitely adjustable)
  for DS III HART: 1 mbar ... 30 bar (0.0145 ... 435 psi)
• Nominal measuring range
  for DS III PA and FF: 20 mbar ... 30 bar (1.45 ... 435 psi)

Pressure transmitters for level

• Measured variable: Level of aggressive and non-aggressive liquids in open and closed vessels.
• Span (infinitely adjustable)
  for DS III HART: 25 mbar ... 5 bar (0.363 ... 72.5 psi)
• Nominal measuring range
  for DS III PA and FF: 250 mbar ... 5 bar (3.63 ... 72.5 psi)
• Nominal diameter of the mounting flange
  • DN 80 or DN 100
  • 3 inch or 4 inch

In the case of level measurements in open containers, the low-pressure connection of the measuring cell remains open (measurement "compared to atmospheric").

In the case of measurements in closed containers, the lower-pressure connection has to be connected to the container in order to compensate the static pressure.

The wetted parts are made from a variety of materials, depending on the degree of corrosion resistance required.

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