Siemens SITRANS P Manual de usuario descargar pdf (Pagina 28)

SITRANS P measuring instruments for pressure

Transmitters for food, pharmaceuticals and biotechnology

SITRANS P300 for gage and absolute pressure

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Siemens FI 01 · 2009

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Overview

The SITRANS P300 is a digital pressure transmitter for gage and

absolute pressure. All conventional thread versions are available

as process connections. In addition, various hygiene-based

connections and flange connections with front-flush diaphragms

meet the requirements of a dead space free process connec-

tion.

The output signal is a load-independent direct current from 4 to

20 mA or a PROFIBUS PA signal, which is linearly proportional to

the input pressure. Communication is over HART protocol or

over PROFIBUS PA interface. Convenient buttons for easy local

operation of the basic settings of the pressure transmitter.

The SITRANS P300 has a single-chamber stainless steel casing.

The pressure transmitter is approved with "intrinsically safe" type

of protection It can be used in zone 1 or zone 0.

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Benefits

• High quality and long life

• High reliability even under extreme chemical and mechanical

loads

• Extensive diagnosis and simulation functions

• Minimum conformity error

• Small long-term drift

• Wetted parts made of high-grade materials (such as stainless

steel, Hastelloy)

• Measuring range 8 mbar to 400 bar

• High measuring accuracy

• Parameterization over control keys and HART communication

or PROFIBUS PA communication

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Application

The pressure transmitter is available in versions for gage pres-

sure and for absolute pressure. The output signal is always a

load-independent direct current from 4 to 20 mA or a

PROFIBUS PA signal, which is linearly proportional to the input

pressure. The pressure transmitter measures aggressive, non-

aggressive and hazardous gases, as well as vapors and liquids.

It can be used for the following measurement types:

• Gage pressure

• Absolute pressure

With appropriate parameter settings, it can also be used for the

following additional measurement types:

• Level

• Volume

• Mass

The "intrinsically-safe" EEx version of the transmitter can be in-

stalled in hazardous areas (zone 1). The transmitters are pro-

vided with an EC type examination certificate and comply with

the respective harmonized European standards of ATEX.

Gage pressure

This variant measures aggressive, non-aggressive and hazard-

ous gases, vapors and liquids.

The smallest measuring span is 10 mbar g, the largest 400 bar g.

Level

With appropriate parameter settings, the gage pressure variant

measures the level of aggressive, non-aggr

essive and hazard-

ous liquids.

For measuring the level in an open container you require one de-

vice; for measuring the level in a closed container, you require

two devices and a process control system.

Absolute pressure

This variant measures the absolute pressure of aggressive, non-

aggressive and hazardous gases, vapors and liquids.

The smallest measuring span is 8 mbar a, the largest 30 bar a.

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